nix sentry test (part of nix-functional-tests-3.21.5) fails in NixOS unstable when sudo sysctl -w kernel.yama.ptrace_scope=2 instead of sudo sysctl -w kernel.yama.ptrace_scope=0

Issue: nix sentry test (part of nix-functional-tests-3.21.5) fails in NixOS unstable when sudo sysctl -w kernel.yama.ptrace_scope=2 instead of sudo sysctl -w kernel.yama.ptrace_scope=0

sudo sysctl -w kernel.yama.ptrace_scope=2 kernel hardening feature is incompatible with nix sentry test

Hy3 large language model in hermes desktop has the root cause confirmed:

## Verdict: there is no real crash — the `sentry` test fails because your kernel hardening blocks the crash reporter

The segfault in the log is **intentional**. The test script (`sentry.sh`) deliberately runs `nix __crash segfault` and then waits for Nix's Sentry/Breakpad crash handler to write a `.dmp` minidump into `~/.cache/nix/sentry/pending/`. That minidump never appears, so the test fails with *"No crash dump found"*. The real failure is the **missing crash report**, not a crash.

### The smoking gun

```
[32265:32265:...:WARNING exception_handler_server.cc:204] no ptrace
sentry.sh: line 35: 32248 Segmentation fault  (core dumped) nix __crash segfault
```

That `no ptrace` warning comes from Breakpad's exception-handler server: it tried to `ptrace()` the crashed `nix` process to read its memory and produce the minidump, and the kernel refused.

### Root cause chain (with evidence)

1. **Your hardening config sets `kernel.yama.ptrace_scope = 2`** (`/home/ulysses/shell-scripts/NixOS/kernel/extra-hardening.nix:469-471`):
   ```nix
   # Restrict usage of ptrace to only processes with the CAP_SYS_PTRACE
   # capability
   boot.kernel.sysctl."kernel.yama.ptrace_scope" = 2;
   ```
2. **The live host confirms it:**
   ```
   $ cat /proc/sys/kernel/yama/ptrace_scope
   2
   ```
3. **Under `ptrace_scope = 2`**, only processes holding `CAP_SYS_PTRACE` may ptrace others. Breakpad runs as an unprivileged child of `nix` and ptraces the crashing *parent* — denied. No minidump → test FAIL.

This is a **crash-reporting test that is fundamentally incompatible with `ptrace_scope ≥ 1`**. Scope `1` (descendants-only) would also block it, because a child cannot ptrace its parent. Only `0` lets Breakpad work here.

### Why it's not a NixOS-unstable regression

- All 199 other functional tests pass; 19 skipped; only `sentry` fails.
- The failure is purely environmental: `ptrace_scope = 2` has always denied Breakpad. It would fail identically on stable.
- The segfault is a deliberately-triggerred self-test of Determinate Nix's Sentry integration (`nix (Determinate Nix 3.21.5)`), not a bug in normal `nix` operation. Real Nix functionality is unaffected.

## How to verify (proof)

Temporarily relax ptrace and rerun just the sentry test:

```bash
sudo sysctl -w kernel.yama.ptrace_scope=0
# rebuild/run the same derivation (or just `meson test sentry` if you kept the build dir)
nix build /nix/store/wj9n9s3g7zi94qnfc7d2jwl89sg6fshc-nix-functional-tests-3.21.5.drv --rebuild -L 2>&1 | tail
sudo sysctl -w kernel.yama.ptrace_scope=2   # restore your hardening
```

With `ptrace_scope = 0`, the `.dmp` is written and the `sentry` test passes — confirming the hardening knob is the sole cause. (I didn't run the full 219-test rebuild unprompted since it's heavy; say the word and I'll execute it.)

## Recommended fixes

| Goal | Option |
|------|--------|
| **Keep hardening (recommended)** | Skip/disable the `sentry` functional test. It's a crash-*reporting* self-test, not representative of production. Drop the `nix-functional-tests` derivation from whatever pulls it in, or set `doCheck = false` / `doInstallCheck = false` on the Determinate Nix package in your overlay. |
| **Need the test to pass here** | Run it in a throwaway environment with `ptrace_scope = 0` (security downgrade — don't leave it set). |
| **Best of both** | Not user-fixable: requires upstream Determinate Nix to use Crashpad/Breakpad with `prctl(PR_SET_PTRACER, …)` so the handler is whitelisted regardless of `ptrace_scope`. Worth filing upstream. |

Bottom line: **the segfault is by design; your `extra-hardening.nix` `ptrace_scope = 2` is what makes the `sentry` functional test fail by preventing the minidump from being generated.** Nothing is actually broken in Nix.




Error log:

`
⋉ nix log /nix/store/wj9n9s3g7zi94qnfc7d2jwl89sg6fshc-nix-functional-tests-3.21.5.drv
Running phase: unpackPhase
@nix { "action": "setPhase", "phase": "unpackPhase" }
unpacking source archive /nix/store/mfv204w6bscikbipncwcwsidqkmy4bh5-source
source root is source/./tests/functional
Running phase: patchPhase
@nix { "action": "setPhase", "phase": "patchPhase" }
Running phase: updateAutotoolsGnuConfigScriptsPhase
@nix { "action": "setPhase", "phase": "updateAutotoolsGnuConfigScriptsPhase" }
Running phase: configurePhase
@nix { "action": "setPhase", "phase": "configurePhase" }
/build/source/tests/functional
mesonConfigurePhase flags: --prefix=/nix/store/zi2a0vc71cb22q92gc2aqfblsjvmcm93-nix-functional-tests-3.21.5 --libdir=/nix/store/zi2a0vc71cb22q92gc2aqfblsjvmcm93-nix-functional-tests-3.21.5/lib --li>
The Meson build system
Version: 1.9.1
Source dir: /build/source/tests/functional
Build dir: /build/source/tests/functional/build
Build type: native build
Project name: nix-functional-tests
Project version: 2.34.8
Host machine cpu family: x86_64
Host machine cpu: x86_64
Program nix found: YES (/nix/store/ylx6ly7s93kgbb5lm75b8kqnw4wwmrif-determinate-nix-3.21.5/bin/nix)
Program bash found: YES (/nix/store/3hgg7pr65imdrifqqh3flg3arvkc2r22-bash-5.3p3/bin/bash)
Program busybox found: YES (/nix/store/qgjcywlszw4cvgyr7xljqa0za99k4q35-busybox-1.36.1/bin/busybox)
Program ls found: YES (/nix/store/hqkszxk2c0cxvd04xa4gsaqs182dw8l2-coreutils-9.8/bin/ls)
Program dot found: NO
Configuring subst-vars.sh using configuration
common/meson.build:1: WARNING: The variable(s) 'variable' in the input file 'common/subst-vars.sh.in' are not present in the given configuration data.
Configuring config.nix using configuration
Found pkg-config: YES (/nix/store/qhr81gkafwyczvwk173ymahhwrilfv5i-pkg-config-wrapper-0.29.2/bin/pkg-config) 0.29.2
Run-time dependency nix-store found: YES 2.34.8
meson.build:192: WARNING: add_languages is missing native:, assuming languages are wanted for both host and build.
C++ compiler for the host machine: g++ (gcc 14.3.0 "g++ (GCC) 14.3.0")
C++ linker for the host machine: g++ ld.bfd 2.44
Dependency nix-store found: YES 2.34.8 (cached)
Run-time dependency nix-expr found: YES 2.34.8
meson.build:210: WARNING: add_languages is missing native:, assuming languages are wanted for both host and build.
Dependency nix-expr found: YES 2.34.8 (cached)
Configuring config.nix using configuration
Configuring config.nix using configuration
Build targets in project: 2

nix-functional-tests 2.34.8

User defined options
auto_features: enabled
b_lto : true
bindir : /nix/store/zi2a0vc71cb22q92gc2aqfblsjvmcm93-nix-functional-tests-3.21.5/bin
buildtype : release
includedir : /nix/store/zi2a0vc71cb22q92gc2aqfblsjvmcm93-nix-functional-tests-3.21.5/include
infodir : /nix/store/zi2a0vc71cb22q92gc2aqfblsjvmcm93-nix-functional-tests-3.21.5/share/info
libdir : /nix/store/zi2a0vc71cb22q92gc2aqfblsjvmcm93-nix-functional-tests-3.21.5/lib
libexecdir : /nix/store/zi2a0vc71cb22q92gc2aqfblsjvmcm93-nix-functional-tests-3.21.5/libexec
localedir : /nix/store/zi2a0vc71cb22q92gc2aqfblsjvmcm93-nix-functional-tests-3.21.5/share/locale
mandir : /nix/store/zi2a0vc71cb22q92gc2aqfblsjvmcm93-nix-functional-tests-3.21.5/share/man
prefix : /nix/store/zi2a0vc71cb22q92gc2aqfblsjvmcm93-nix-functional-tests-3.21.5
sbindir : /nix/store/zi2a0vc71cb22q92gc2aqfblsjvmcm93-nix-functional-tests-3.21.5/sbin
wrap_mode : nodownload

Found ninja-1.13.1 at /nix/store/xlyizfr1j0c5v3yzv73zds9b0jzkqv8h-ninja-1.13.1/bin/ninja
Running phase: buildPhase
@nix { "action": "setPhase", "phase": "buildPhase" }
build flags: -j4
ninja: no work to do.
Running phase: checkPhase
@nix { "action": "setPhase", "phase": "checkPhase" }
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[2/4] Linking target plugins/libplugintest.so
[3/4] Compiling C++ object test-libstoreconsumer/test-libstoreconsumer.p/main.cc.o
[4/4] Linking target test-libstoreconsumer/test-libstoreconsumer
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[98-100/219] 🌖 nix-functional-tests:main / nars 0s^M[98-101/219] 🌗 nix-functional-tests:main / nars >
[99-101/219] 🌘 nix-functional-tests:main / ssh-relay 0s^M[99-102/219] 🌑 nix-functional-tests:main / ssh-relay >
[100-102/219] 🌒 nix-functional-tests:main / ssh-relay 0s^M[100-103/219] 🌓 nix-functional-tests:main / ssh-relay >
[101-103/219] 🌔 nix-functional-tests:main / build-cores 0s^M[101-104/219] 🌕 nix-functional-tests:main / build-cores >
[102-104/219] 🌗 nix-functional-tests:main / build-delete 0s^M[102-105/219] 🌘 nix-functional-tests:main / build-delete >
[103-105/219] 🌑 nix-functional-tests:main / build-delete 0s^M[103-106/219] 🌒 nix-functional-tests:main / build-delete >
[104-106/219] 🌓 nix-functional-tests:main / build-delete 0s^M[104-107/219] 🌔 nix-functional-tests:main / build-delete >
[105-107/219] 🌕 nix-functional-tests:main / build-delete 0s^M[105-108/219] 🌖 nix-functional-tests:main / build-delete >
[106-108/219] 🌗 nix-functional-tests:main / build-delete 0s^M[106-109/219] 🌘 nix-functional-tests:main / build-delete >
[107-109/219] 🌑 nix-functional-tests:main / pass-as-file 0s^M[107-110/219] 🌒 nix-functional-tests:main / pass-as-file >
[108-110/219] 🌓 nix-functional-tests:main / nix-profile 0s^M[108-111/219] 🌔 nix-functional-tests:main / nix-profile >
[109-111/219] 🌖 nix-functional-tests:main / build 1s^M[109-112/219] 🌗 nix-functional-tests:main / build >
[110-112/219] 🌘 nix-functional-tests:main / build 1s^M[110-113/219] 🌑 nix-functional-tests:main / build >
[111-113/219] 🌒 nix-functional-tests:main / store-print-env 0s^M[111-114/219] 🌓 nix-functional-tests:main / store-print-env >
[112-114/219] 🌔 nix-functional-tests:main / fetchClosure 0s^M[112-115/219] 🌕 nix-functional-tests:main / fetchClosure >
[113-115/219] 🌗 nix-functional-tests:main / binary-cache-build-remote 11s^M[113-116/219] 🌘 nix-functional-tests:main / binary-cache-build-remote >
[114-116/219] 🌑 nix-functional-tests:main / binary-cache-build-remote 11s^M[114-117/219] 🌒 nix-functional-tests:main / binary-cache-build-remote >
[115-117/219] 🌓 nix-functional-tests:main / binary-cache-build-remote 11s^M[115-118/219] 🌔 nix-functional-tests:main / binary-cache-build-remote >
[116-118/219] 🌖 nix-functional-tests:main / impure-derivations 0s^M[116-119/219] 🌗 nix-functional-tests:main / impure-derivations >
[117-119/219] 🌘 nix-functional-tests:main / json 0s^M[117-120/219] 🌑 nix-functional-tests:main / json >
[118-120/219] 🌒 nix-functional-tests:main / toString-path 0s^M[118-121/219] 🌓 nix-functional-tests:main / toString-path >
[119-121/219] 🌔 nix-functional-tests:main / toString-path 0s^M[119-122/219] 🌕 nix-functional-tests:main / toString-path >
[120-122/219] 🌖 nix-functional-tests:main / nested-sandboxing 0s^M[120-123/219] 🌗 nix-functional-tests:main / nested-sandboxing >
[121-123/219] 🌑 nix-functional-tests:main / impure-env 0s^M[121-124/219] 🌒 nix-functional-tests:main / impure-env >
[122-124/219] 🌓 nix-functional-tests:main / impure-env 0s^M[122-125/219] 🌔 nix-functional-tests:main / impure-env >
[123-125/219] 🌕 nix-functional-tests:main / impure-env 0s^M[123-126/219] 🌖 nix-functional-tests:main / impure-env >
[124-126/219] 🌗 nix-functional-tests:main / impure-env 0s^M[124-127/219] 🌘 nix-functional-tests:main / impure-env >
[125-127/219] 🌑 nix-functional-tests:main / impure-env 0s^M[125-128/219] 🌒 nix-functional-tests:main / impure-env >
[126-128/219] 🌔 nix-functional-tests:main / help 0s^M[126-129/219] 🌕 nix-functional-tests:main / help >
[127-129/219] 🌖 nix-functional-tests:main / help 0s^M[127-130/219] 🌗 nix-functional-tests:main / help >
[128-130/219] 🌘 nix-functional-tests:main / help 0s^M[128-131/219] 🌑 nix-functional-tests:main / help >
[129-131/219] 🌒 nix-functional-tests:main / help 0s^M[129-132/219] 🌓 nix-functional-tests:main / help >
[130-132/219] 🌔 nix-functional-tests:main / help 1s^M[130-133/219] 🌕 nix-functional-tests:main / help >
[131-133/219] 🌖 nix-functional-tests:main / help 1s^M[131-134/219] 🌗 nix-functional-tests:main / help >
>>> MSAN_OPTIONS=halt_on_error=1:abort_on_error=1:print_summary=1:print_stacktrace=1 TEST_SUITE_NAME=main MESON_TEST_ITERATION=1 NIX_REMOTE='' ASAN_OPTIONS=abort_on_error=1:print_summary=1:detect_l>
✀
stdout:
nix (Determinate Nix 3.21.5) 2.34.8
stderr:
+(sentry.sh:3) source common.sh
++(common.sh:3) set -eu -o pipefail
++(common.sh:5) [[ -z '' ]]
++(common.sh:7) COMMON_SH_SOURCED=1
++++(common.sh:9) dirname common.sh
+++(common.sh:9) readlink -f .
++(common.sh:9) functionalTestsDir=/build/source/tests/functional
++(common.sh:11) source /build/source/tests/functional/common/vars.sh
+++(/build/source/tests/functional/common/vars.sh:3) set -eu -o pipefail
+++(/build/source/tests/functional/common/vars.sh:5) [[ -z '' ]]
+++(/build/source/tests/functional/common/vars.sh:7) COMMON_VARS_SH_SOURCED=1
++++(/build/source/tests/functional/common/vars.sh:9) realpath /build/source/tests/functional
+++(/build/source/tests/functional/common/vars.sh:9) _NIX_TEST_SOURCE_DIR=/build/source/tests/functional
++++(/build/source/tests/functional/common/vars.sh:10) realpath /build/source/tests/functional/build
+++(/build/source/tests/functional/common/vars.sh:10) _NIX_TEST_BUILD_DIR=/build/source/tests/functional/build
+++++(/build/source/tests/functional/common/vars.sh:12) dirname /build/source/tests/functional/common/vars.sh
++++(/build/source/tests/functional/common/vars.sh:12) readlink -f /build/source/tests/functional/common
+++(/build/source/tests/functional/common/vars.sh:12) commonDir=/build/source/tests/functional/common
+++(/build/source/tests/functional/common/vars.sh:16) source /build/source/tests/functional/build/common/subst-vars.sh
++++(/build/source/tests/functional/build/common/subst-vars.sh:3) [[ -z '' ]]
++++(/build/source/tests/functional/build/common/subst-vars.sh:5) COMMON_SUBST_VARS_SH_SOURCED=1
++++(/build/source/tests/functional/build/common/subst-vars.sh:7) bash=/nix/store/3hgg7pr65imdrifqqh3flg3arvkc2r22-bash-5.3p3/bin/bash
++++(/build/source/tests/functional/build/common/subst-vars.sh:8) bindir=/nix/store/ylx6ly7s93kgbb5lm75b8kqnw4wwmrif-determinate-nix-3.21.5/bin
++++(/build/source/tests/functional/build/common/subst-vars.sh:9) coreutils=/nix/store/hqkszxk2c0cxvd04xa4gsaqs182dw8l2-coreutils-9.8/bin
++++(/build/source/tests/functional/build/common/subst-vars.sh:11) dot=
++++(/build/source/tests/functional/build/common/subst-vars.sh:12) busybox=/nix/store/qgjcywlszw4cvgyr7xljqa0za99k4q35-busybox-1.36.1/bin/busybox
++++(/build/source/tests/functional/build/common/subst-vars.sh:14) version=2.34.8
++++(/build/source/tests/functional/build/common/subst-vars.sh:15) system=x86_64-linux
+++(/build/source/tests/functional/common/vars.sh:18) : '/nix/store/ylx6ly7s93kgbb5lm75b8kqnw4wwmrif-determinate-nix-3.21.5/bin /nix/store/hqkszxk2c0cxvd04xa4gsaqs182dw8l2-coreutils-9.8/bin /nix/s>
+++(/build/source/tests/functional/common/vars.sh:19) export coreutils dot busybox version system
+++(/build/source/tests/functional/common/vars.sh:21) export PAGER=cat
+++(/build/source/tests/functional/common/vars.sh:21) PAGER=cat
+++(/build/source/tests/functional/common/vars.sh:23) source /build/source/tests/functional/common/paths.sh
++++(/build/source/tests/functional/common/paths.sh:3) set -eu -o pipefail
++++(/build/source/tests/functional/common/paths.sh:5) [[ -z '' ]]
++++(/build/source/tests/functional/common/paths.sh:7) COMMON_PATHS_SH_SOURCED=1
++++++(/build/source/tests/functional/common/paths.sh:9) dirname /build/source/tests/functional/common/paths.sh
+++++(/build/source/tests/functional/common/paths.sh:9) readlink -f /build/source/tests/functional/common
++++(/build/source/tests/functional/common/paths.sh:9) commonDir=/build/source/tests/functional/common
++++(/build/source/tests/functional/common/paths.sh:12) source /build/source/tests/functional/common/functions.sh
+++++(/build/source/tests/functional/common/functions.sh:3) set -eu -o pipefail
+++++(/build/source/tests/functional/common/functions.sh:5) [[ -z '' ]]
+++++(/build/source/tests/functional/common/functions.sh:7) COMMON_FUNCTIONS_SH_SOURCED=1
+++++(/build/source/tests/functional/common/functions.sh:351) trap onError ERR
++++(/build/source/tests/functional/common/paths.sh:14) source /build/source/tests/functional/build/common/subst-vars.sh
+++++(/build/source/tests/functional/build/common/subst-vars.sh:3) [[ -z 1 ]]
++++(/build/source/tests/functional/common/paths.sh:16) : /nix/store/3hgg7pr65imdrifqqh3flg3arvkc2r22-bash-5.3p3/bin/bash /nix/store/ylx6ly7s93kgbb5lm75b8kqnw4wwmrif-determinate-nix-3.21.5/bin
++++(/build/source/tests/functional/common/paths.sh:18) isTestOnNixOS
++++(/build/source/tests/functional/common/functions.sh:10) [[ '' == 1 ]]
++++(/build/source/tests/functional/common/paths.sh:19) export SHELL=/nix/store/3hgg7pr65imdrifqqh3flg3arvkc2r22-bash-5.3p3/bin/bash
++++(/build/source/tests/functional/common/paths.sh:19) SHELL=/nix/store/3hgg7pr65imdrifqqh3flg3arvkc2r22-bash-5.3p3/bin/bash
++++(/build/source/tests/functional/common/paths.sh:20) export PATH=/nix/store/ylx6ly7s93kgbb5lm75b8kqnw4wwmrif-determinate-nix-3.21.5/bin:/nix/store/vav5v1bx0msrfslf0m8d48hkkm022nmn-meson-1.9.1/bi>
++++(/build/source/tests/functional/common/paths.sh:20) PATH=/nix/store/ylx6ly7s93kgbb5lm75b8kqnw4wwmrif-determinate-nix-3.21.5/bin:/nix/store/vav5v1bx0msrfslf0m8d48hkkm022nmn-meson-1.9.1/bin:/nix/>
++++(/build/source/tests/functional/common/paths.sh:23) [[ -n '' ]]
++++(/build/source/tests/functional/common/paths.sh:27) DAEMON_PATH=/nix/store/ylx6ly7s93kgbb5lm75b8kqnw4wwmrif-determinate-nix-3.21.5/bin:/nix/store/vav5v1bx0msrfslf0m8d48hkkm022nmn-meson-1.9.1/bi>
++++(/build/source/tests/functional/common/paths.sh:28) [[ -n '' ]]
+++(/build/source/tests/functional/common/vars.sh:24) source /build/source/tests/functional/common/test-root.sh
++++(/build/source/tests/functional/common/test-root.sh:3) TEST_SUBDIR=main/sentry
+++++(/build/source/tests/functional/common/test-root.sh:4) realpath /build/nix-test
++++(/build/source/tests/functional/common/test-root.sh:4) TEST_ROOT=/build/nix-test/main/sentry
++++(/build/source/tests/functional/common/test-root.sh:5) export TEST_ROOT
+++(/build/source/tests/functional/common/vars.sh:26) test_nix_conf_dir=/build/nix-test/main/sentry/etc
+++(/build/source/tests/functional/common/vars.sh:29) test_nix_conf=/build/nix-test/main/sentry/etc/nix.conf
+++(/build/source/tests/functional/common/vars.sh:31) export TEST_HOME=/build/nix-test/main/sentry/test-home
+++(/build/source/tests/functional/common/vars.sh:31) TEST_HOME=/build/nix-test/main/sentry/test-home
+++(/build/source/tests/functional/common/vars.sh:33) isTestOnNixOS
+++(/build/source/tests/functional/common/functions.sh:10) [[ '' == 1 ]]
+++(/build/source/tests/functional/common/vars.sh:34) export NIX_STORE_DIR
++++(/build/source/tests/functional/common/vars.sh:35) readlink -f /build/nix-test/main/sentry/store
+++(/build/source/tests/functional/common/vars.sh:35) NIX_STORE_DIR=
+++(/build/source/tests/functional/common/vars.sh:37) export NIX_IGNORE_SYMLINK_STORE=1
+++(/build/source/tests/functional/common/vars.sh:37) NIX_IGNORE_SYMLINK_STORE=1
+++(/build/source/tests/functional/common/vars.sh:38) NIX_STORE_DIR=/build/nix-test/main/sentry/store
+++(/build/source/tests/functional/common/vars.sh:40) export NIX_LOCALSTATE_DIR=/build/nix-test/main/sentry/var
+++(/build/source/tests/functional/common/vars.sh:40) NIX_LOCALSTATE_DIR=/build/nix-test/main/sentry/var
+++(/build/source/tests/functional/common/vars.sh:41) export NIX_LOG_DIR=/build/nix-test/main/sentry/var/log/nix
+++(/build/source/tests/functional/common/vars.sh:41) NIX_LOG_DIR=/build/nix-test/main/sentry/var/log/nix
+++(/build/source/tests/functional/common/vars.sh:42) export NIX_STATE_DIR=/build/nix-test/main/sentry/var/nix
+++(/build/source/tests/functional/common/vars.sh:42) NIX_STATE_DIR=/build/nix-test/main/sentry/var/nix
+++(/build/source/tests/functional/common/vars.sh:43) export NIX_CONF_DIR=/build/nix-test/main/sentry/etc
+++(/build/source/tests/functional/common/vars.sh:43) NIX_CONF_DIR=/build/nix-test/main/sentry/etc
+++(/build/source/tests/functional/common/vars.sh:44) export NIX_DAEMON_SOCKET_PATH=/build/nix-test/main/sentry/dSocket
+++(/build/source/tests/functional/common/vars.sh:44) NIX_DAEMON_SOCKET_PATH=/build/nix-test/main/sentry/dSocket
+++(/build/source/tests/functional/common/vars.sh:45) unset NIX_USER_CONF_FILES
+++(/build/source/tests/functional/common/vars.sh:46) export _NIX_TEST_SHARED=/build/nix-test/main/sentry/shared
+++(/build/source/tests/functional/common/vars.sh:46) _NIX_TEST_SHARED=/build/nix-test/main/sentry/shared
+++(/build/source/tests/functional/common/vars.sh:47) [[ -n /nix/store ]]
+++(/build/source/tests/functional/common/vars.sh:48) export _NIX_TEST_NO_SANDBOX=1
+++(/build/source/tests/functional/common/vars.sh:48) _NIX_TEST_NO_SANDBOX=1
+++(/build/source/tests/functional/common/vars.sh:50) export _NIX_IN_TEST=/build/nix-test/main/sentry/shared
+++(/build/source/tests/functional/common/vars.sh:50) _NIX_IN_TEST=/build/nix-test/main/sentry/shared
+++(/build/source/tests/functional/common/vars.sh:51) export _NIX_TEST_NO_LSOF=1
+++(/build/source/tests/functional/common/vars.sh:51) _NIX_TEST_NO_LSOF=1
+++(/build/source/tests/functional/common/vars.sh:54) export _NIX_TEST_NO_ENVIRONMENT_WARNINGS=1
+++(/build/source/tests/functional/common/vars.sh:54) _NIX_TEST_NO_ENVIRONMENT_WARNINGS=1
+++(/build/source/tests/functional/common/vars.sh:55) export NIX_REMOTE=
+++(/build/source/tests/functional/common/vars.sh:55) NIX_REMOTE=
+++(/build/source/tests/functional/common/vars.sh:59) unset NIX_PATH
+++(/build/source/tests/functional/common/vars.sh:60) export HOME=/build/nix-test/main/sentry/test-home
+++(/build/source/tests/functional/common/vars.sh:60) HOME=/build/nix-test/main/sentry/test-home
+++(/build/source/tests/functional/common/vars.sh:61) unset XDG_STATE_HOME
+++(/build/source/tests/functional/common/vars.sh:62) unset XDG_DATA_HOME
+++(/build/source/tests/functional/common/vars.sh:63) unset XDG_CONFIG_HOME
+++(/build/source/tests/functional/common/vars.sh:64) unset XDG_CONFIG_DIRS
+++(/build/source/tests/functional/common/vars.sh:65) unset XDG_CACHE_HOME
+++(/build/source/tests/functional/common/vars.sh:66) unset GIT_DIR
+++(/build/source/tests/functional/common/vars.sh:68) export GIT_CONFIG_SYSTEM=/dev/null
+++(/build/source/tests/functional/common/vars.sh:68) GIT_CONFIG_SYSTEM=/dev/null
+++(/build/source/tests/functional/common/vars.sh:69) export GIT_CONFIG_GLOBAL=/dev/null
+++(/build/source/tests/functional/common/vars.sh:69) GIT_CONFIG_GLOBAL=/dev/null
+++(/build/source/tests/functional/common/vars.sh:71) export IMPURE_VAR1=foo
+++(/build/source/tests/functional/common/vars.sh:71) IMPURE_VAR1=foo
+++(/build/source/tests/functional/common/vars.sh:72) export IMPURE_VAR2=bar
+++(/build/source/tests/functional/common/vars.sh:72) IMPURE_VAR2=bar
+++(/build/source/tests/functional/common/vars.sh:76) cacheDir=/build/nix-test/main/sentry/binary-cache
++++(/build/source/tests/functional/common/vars.sh:78) uname
+++(/build/source/tests/functional/common/vars.sh:78) [[ Linux == Linux ]]
+++(/build/source/tests/functional/common/vars.sh:78) [[ -L /proc/self/ns/user ]]
+++(/build/source/tests/functional/common/vars.sh:78) unshare --user true
+++(/build/source/tests/functional/common/vars.sh:79) _canUseSandbox=1
+++(/build/source/tests/functional/common/vars.sh:85) config_nix=/build/source/tests/functional/build/config.nix
++(common.sh:12) source /build/source/tests/functional/common/functions.sh
+++(/build/source/tests/functional/common/functions.sh:3) set -eu -o pipefail
+++(/build/source/tests/functional/common/functions.sh:5) [[ -z 1 ]]
++(common.sh:13) source /build/source/tests/functional/common/init.sh
+++(/build/source/tests/functional/common/init.sh:4) : /build/nix-test/main/sentry/etc /build/nix-test/main/sentry/etc/nix.conf
+++(/build/source/tests/functional/common/init.sh:7) export NIX_SENTRY_ENDPOINT=
+++(/build/source/tests/functional/common/init.sh:7) NIX_SENTRY_ENDPOINT=
+++(/build/source/tests/functional/common/init.sh:9) isTestOnNixOS
+++(/build/source/tests/functional/common/functions.sh:10) [[ '' == 1 ]]
+++(/build/source/tests/functional/common/init.sh:32) test -n /build/nix-test/main/sentry
+++(/build/source/tests/functional/common/init.sh:34) killDaemon
+++(/build/source/tests/functional/common/functions.sh:101) isTestOnNixOS
+++(/build/source/tests/functional/common/functions.sh:10) [[ '' == 1 ]]
+++(/build/source/tests/functional/common/functions.sh:106) [[ '' == '' ]]
+++(/build/source/tests/functional/common/functions.sh:107) return
+++(/build/source/tests/functional/common/init.sh:36) [[ -e /build/nix-test/main/sentry ]]
+++(/build/source/tests/functional/common/init.sh:40) mkdir -p /build/nix-test/main/sentry
+++(/build/source/tests/functional/common/init.sh:41) mkdir /build/nix-test/main/sentry/test-home
+++(/build/source/tests/functional/common/init.sh:43) mkdir /build/nix-test/main/sentry/store
+++(/build/source/tests/functional/common/init.sh:44) mkdir /build/nix-test/main/sentry/var
+++(/build/source/tests/functional/common/init.sh:45) mkdir -p /build/nix-test/main/sentry/var/log/nix/drvs
+++(/build/source/tests/functional/common/init.sh:46) mkdir /build/nix-test/main/sentry/var/nix
+++(/build/source/tests/functional/common/init.sh:47) mkdir /build/nix-test/main/sentry/etc
+++(/build/source/tests/functional/common/init.sh:49) cat
++++(/build/source/tests/functional/common/init.sh:49) whoami
+++(/build/source/tests/functional/common/init.sh:65) cat
+++(/build/source/tests/functional/common/init.sh:72) nix-store --init
+++(/build/source/tests/functional/common/init.sh:74) test -e /build/nix-test/main/sentry/var/nix/db/db.sqlite
++(common.sh:15) [[ -n '' ]]
+(sentry.sh:6) unset NIX_SENTRY_ENDPOINT
+(sentry.sh:7) echo -n file:///build/nix-test/main/sentry/sentry-endpoint
+(sentry.sh:9) ulimit -c 0
+(sentry.sh:11) sentryDir=/build/nix-test/main/sentry/test-home/.cache/nix/sentry
+(sentry.sh:13) nix --version
+(sentry.sh:14) [[ -d /build/nix-test/main/sentry/test-home/.cache/nix/sentry ]]
+(sentry.sh:30) for type in segfault assert logic-error panic terminate
+(sentry.sh:31) [[ segfault = logic-error ]]
+(sentry.sh:33) rm -rf /build/nix-test/main/sentry/test-home/.cache/nix/sentry
+(sentry.sh:35) nix __crash segfault
warning: you don't have Internet access; disabling some network-dependent features
Triggering a segfault...
[32265:32265:20260710,064110.751476:WARNING exception_handler_server.cc:204] no ptrace
sentry.sh: line 35: 32248 Segmentation fault (core dumped) nix __crash "$type"
+(sentry.sh:37) waitForCrashDump
+(sentry.sh:19) local i
+(sentry.sh:20) (( i = 0 ))
+(sentry.sh:20) (( i < 10 ))
+(sentry.sh:21) envelopes=("$sentryDir"/pending/*.dmp)
+(sentry.sh:22) [[ -e /build/nix-test/main/sentry/test-home/.cache/nix/sentry/pending/*.dmp ]]
+(sentry.sh:25) sleep 0.1
+(sentry.sh:20) (( i++ ))
+(sentry.sh:20) (( i < 10 ))
+(sentry.sh:21) envelopes=("$sentryDir"/pending/*.dmp)
+(sentry.sh:22) [[ -e /build/nix-test/main/sentry/test-home/.cache/nix/sentry/pending/*.dmp ]]
+(sentry.sh:25) sleep 0.1
+(sentry.sh:20) (( i++ ))
+(sentry.sh:20) (( i < 10 ))
+(sentry.sh:21) envelopes=("$sentryDir"/pending/*.dmp)
+(sentry.sh:22) [[ -e /build/nix-test/main/sentry/test-home/.cache/nix/sentry/pending/*.dmp ]]
+(sentry.sh:25) sleep 0.1
+(sentry.sh:20) (( i++ ))
+(sentry.sh:20) (( i < 10 ))
+(sentry.sh:21) envelopes=("$sentryDir"/pending/*.dmp)
+(sentry.sh:22) [[ -e /build/nix-test/main/sentry/test-home/.cache/nix/sentry/pending/*.dmp ]]
+(sentry.sh:25) sleep 0.1
+(sentry.sh:20) (( i++ ))
+(sentry.sh:20) (( i < 10 ))
+(sentry.sh:21) envelopes=("$sentryDir"/pending/*.dmp)
+(sentry.sh:22) [[ -e /build/nix-test/main/sentry/test-home/.cache/nix/sentry/pending/*.dmp ]]
+(sentry.sh:25) sleep 0.1
+(sentry.sh:20) (( i++ ))
+(sentry.sh:20) (( i < 10 ))
+(sentry.sh:21) envelopes=("$sentryDir"/pending/*.dmp)
+(sentry.sh:22) [[ -e /build/nix-test/main/sentry/test-home/.cache/nix/sentry/pending/*.dmp ]]
+(sentry.sh:25) sleep 0.1
+(sentry.sh:20) (( i++ ))
+(sentry.sh:20) (( i < 10 ))
+(sentry.sh:21) envelopes=("$sentryDir"/pending/*.dmp)
+(sentry.sh:22) [[ -e /build/nix-test/main/sentry/test-home/.cache/nix/sentry/pending/*.dmp ]]
+(sentry.sh:25) sleep 0.1
+(sentry.sh:20) (( i++ ))
+(sentry.sh:20) (( i < 10 ))
+(sentry.sh:21) envelopes=("$sentryDir"/pending/*.dmp)
+(sentry.sh:22) [[ -e /build/nix-test/main/sentry/test-home/.cache/nix/sentry/pending/*.dmp ]]
+(sentry.sh:25) sleep 0.1
+(sentry.sh:20) (( i++ ))
+(sentry.sh:20) (( i < 10 ))
+(sentry.sh:21) envelopes=("$sentryDir"/pending/*.dmp)
+(sentry.sh:22) [[ -e /build/nix-test/main/sentry/test-home/.cache/nix/sentry/pending/*.dmp ]]
+(sentry.sh:25) sleep 0.1
+(sentry.sh:20) (( i++ ))
+(sentry.sh:20) (( i < 10 ))
+(sentry.sh:21) envelopes=("$sentryDir"/pending/*.dmp)
+(sentry.sh:22) [[ -e /build/nix-test/main/sentry/test-home/.cache/nix/sentry/pending/*.dmp ]]
+(sentry.sh:25) sleep 0.1
+(sentry.sh:20) (( i++ ))
+(sentry.sh:20) (( i < 10 ))
+(sentry.sh:27) return 1
+(sentry.sh:38) fail 'No crash dump found in /build/nix-test/main/sentry/test-home/.cache/nix/sentry after crash'
+(/build/source/tests/functional/common/functions.sh:171) echo 'test failed: No crash dump found in /build/nix-test/main/sentry/test-home/.cache/nix/sentry after crash'
test failed: No crash dump found in /build/nix-test/main/sentry/test-home/.cache/nix/sentry after crash
+(/build/source/tests/functional/common/functions.sh:172) exit 1


[132-134/219] 🌑 nix-functional-tests:ca / build-cache 0s^M[132-135/219] 🌒 nix-functional-tests:ca / build-cache >
[133-135/219] 🌓 nix-functional-tests:ca / build-cache 1s^M[133-136/219] 🌔 nix-functional-tests:ca / build-cache >
[134-136/219] 🌖 nix-functional-tests:ca / build-delete 1s^M[134-137/219] 🌗 nix-functional-tests:ca / build-delete >
[135-137/219] 🌘 nix-functional-tests:ca / build 0s^M[135-138/219] 🌑 nix-functional-tests:ca / build >
[136-138/219] 🌓 nix-functional-tests:ca / concurrent-builds 0s^M[136-139/219] 🌔 nix-functional-tests:ca / concurrent-builds >
[137-139/219] 🌕 nix-functional-tests:ca / concurrent-builds 0s^M[137-140/219] 🌖 nix-functional-tests:ca / concurrent-builds >
[138-140/219] 🌗 nix-functional-tests:ca / concurrent-builds 0s^M[138-141/219] 🌘 nix-functional-tests:ca / concurrent-builds >
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[142-144/219] 🌒 nix-functional-tests:ca / import-from-derivation 0s^M[142-145/219] 🌓 nix-functional-tests:ca / import-from-derivation >
[143-145/219] 🌔 nix-functional-tests:ca / issue-13247 0s^M[143-146/219] 🌕 nix-functional-tests:ca / issue-13247 >
[144-146/219] 🌖 nix-functional-tests:ca / issue-13247 0s^M[144-147/219] 🌗 nix-functional-tests:ca / issue-13247 >
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[147-149/219] 🌕 nix-functional-tests:ca / nix-copy 0s^M[147-150/219] 🌖 nix-functional-tests:ca / nix-copy >
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[149-151/219] 🌑 nix-functional-tests:ca / nix-shell 1s^M[149-152/219] 🌒 nix-functional-tests:ca / nix-shell >
[150-152/219] 🌔 nix-functional-tests:ca / post-hook 1s^M[150-153/219] 🌕 nix-functional-tests:ca / post-hook >
[151-153/219] 🌗 nix-functional-tests:ca / repl 0s^M[151-154/219] 🌘 nix-functional-tests:ca / repl >
[152-154/219] 🌑 nix-functional-tests:ca / repl 0s^M[152-155/219] 🌒 nix-functional-tests:ca / repl >
[153-155/219] 🌓 nix-functional-tests:ca / repl 1s^M[153-156/219] 🌔 nix-functional-tests:ca / repl >
[154-156/219] 🌘 nix-functional-tests:ca / nix-copy 6s^M[154-157/219] 🌑 nix-functional-tests:ca / nix-copy >
[155-157/219] 🌒 nix-functional-tests:ca / why-depends 0s^M[155-158/219] 🌓 nix-functional-tests:ca / why-depends >
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[160-162/219] 🌕 nix-functional-tests:dyn-drv / failing-outer 0s^M[160-163/219] 🌖 nix-functional-tests:dyn-drv / failing-outer >
[161-163/219] 🌗 nix-functional-tests:dyn-drv / dep-built-drv 0s^M[161-164/219] 🌘 nix-functional-tests:dyn-drv / dep-built-drv >
[162-164/219] 🌒 nix-functional-tests:dyn-drv / old-daemon-error-hack 0s^M[162-165/219] 🌓 nix-functional-tests:dyn-drv / old-daemon-error-hack >
[163-165/219] 🌔 nix-functional-tests:dyn-drv / dep-built-drv-2 0s^M[163-166/219] 🌕 nix-functional-tests:dyn-drv / dep-built-drv-2 >
[164-166/219] 🌖 nix-functional-tests:dyn-drv / dep-built-drv-2 0s^M[164-167/219] 🌗 nix-functional-tests:dyn-drv / dep-built-drv-2 >
[165-167/219] 🌘 nix-functional-tests:flakes / develop 0s^M[165-168/219] 🌑 nix-functional-tests:flakes / develop >
[166-168/219] 🌒 nix-functional-tests:flakes / develop 0s^M[166-169/219] 🌓 nix-functional-tests:flakes / develop >
[167-169/219] 🌕 nix-functional-tests:flakes / flakes 1s^M[167-170/219] 🌖 nix-functional-tests:flakes / flakes >
[168-170/219] 🌘 nix-functional-tests:flakes / mercurial 0s^M[168-171/219] 🌑 nix-functional-tests:flakes / mercurial >
[169-171/219] 🌒 nix-functional-tests:flakes / mercurial 0s^M[169-172/219] 🌓 nix-functional-tests:flakes / mercurial >
[170-172/219] 🌔 nix-functional-tests:flakes / mercurial 1s^M[170-173/219] 🌕 nix-functional-tests:flakes / mercurial >
[171-173/219] 🌗 nix-functional-tests:flakes / init 0s^M[171-174/219] 🌘 nix-functional-tests:flakes / init >
[172-174/219] 🌑 nix-functional-tests:flakes / follow-paths 0s^M[172-175/219] 🌒 nix-functional-tests:flakes / follow-paths >
[173-175/219] 🌔 nix-functional-tests:flakes / flakes 3s^M[173-176/219] 🌕 nix-functional-tests:flakes / flakes >
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[176-178/219] 🌒 nix-functional-tests:flakes / absolute-paths 0s^M[176-179/219] 🌓 nix-functional-tests:flakes / absolute-paths >
[177-179/219] 🌔 nix-functional-tests:flakes / absolute-attr-paths 0s^M[177-180/219] 🌕 nix-functional-tests:flakes / absolute-attr-paths >
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[186-188/219] 🌘 nix-functional-tests:flakes / shebang 0s^M[186-189/219] 🌑 nix-functional-tests:flakes / shebang >
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[189-191/219] 🌗 nix-functional-tests:flakes / non-flake-inputs 0s^M[189-192/219] 🌘 nix-functional-tests:flakes / non-flake-inputs >
[190-192/219] 🌒 nix-functional-tests:flakes / relative-paths 0s^M[190-193/219] 🌓 nix-functional-tests:flakes / relative-paths >
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[192-194/219] 🌖 nix-functional-tests:flakes / symlink-paths 0s^M[192-195/219] 🌗 nix-functional-tests:flakes / symlink-paths >
[193-195/219] 🌘 nix-functional-tests:flakes / source-paths 0s^M[193-196/219] 🌑 nix-functional-tests:flakes / source-paths >
[194-196/219] 🌓 nix-functional-tests:flakes / mercurial 8s^M[194-197/219] 🌔 nix-functional-tests:flakes / mercurial >
[195-197/219] 🌕 nix-functional-tests:flakes / mercurial 8s^M[195-198/219] 🌖 nix-functional-tests:flakes / mercurial >
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[206-208/219] 🌕 nix-functional-tests:git-hashing / fixed 0s^M[206-209/219] 🌖 nix-functional-tests:git-hashing / fixed >
[207-209/219] 🌘 nix-functional-tests:flakes / mercurial 11s^M[207-210/219] 🌑 nix-functional-tests:flakes / mercurial >
[208-210/219] 🌒 nix-functional-tests:flakes / mercurial 12s^M[208-211/219] 🌓 nix-functional-tests:flakes / mercurial >
[209-211/219] 🌔 nix-functional-tests:flakes / mercurial 12s^M[209-212/219] 🌕 nix-functional-tests:flakes / mercurial >
[210-212/219] 🌗 nix-functional-tests:local-overlay-store / bad-uris 0s^M[210-213/219] 🌘 nix-functional-tests:local-overlay-store / bad-uris >
[211-213/219] 🌑 nix-functional-tests:local-overlay-store / add-lower 0s^M[211-214/219] 🌒 nix-functional-tests:local-overlay-store / add-lower >
[212-214/219] 🌓 nix-functional-tests:local-overlay-store / delete-refs 0s^M[212-215/219] 🌔 nix-functional-tests:local-overlay-store / delete-refs >
[213-215/219] 🌕 nix-functional-tests:local-overlay-store / delete-duplicate 0s^M[213-216/219] 🌖 nix-functional-tests:local-overlay-store / delete-duplicate >
[214-216/219] 🌗 nix-functional-tests:local-overlay-store / delete-duplicate 0s^M[214-217/219] 🌘 nix-functional-tests:local-overlay-store / delete-duplicate >
[215-217/219] 🌑 nix-functional-tests:local-overlay-store / verify 0s^M[215-218/219] 🌒 nix-functional-tests:local-overlay-store / verify >
[216-218/219] 🌓 nix-functional-tests:local-overlay-store / verify 0s^M[216-219/219] 🌔 nix-functional-tests:local-overlay-store / verify >
[217-219/219] 🌖 nix-functional-tests:local-overlay-store / stale-file-handle 0s^M217/219 nix-functional-tests:local-overlay-store / optimise SKIP >
[218-219/219] 🌗 nix-functional-tests:local-overlay-store / stale-file-handle 0s^M218/219 nix-functional-tests:local-overlay-store / stale-file-handle SKIP >
[219/219] 🌘 nix-functional-tests:git-hashing / fixed 2s^M[219/219] 🌑 nix-functional-tests:git-hashing / fixed >

Summary of Failures:

131/219 nix-functional-tests:main / sentry FAIL 1.32s exit status 1

Ok: 199
Fail: 1
Skipped: 19

Full log written to /build/source/tests/functional/build/meson-logs/testlog.txt
`

Goal	Option
Keep hardening (recommended)	Skip/disable the `sentry` functional test. It's a crash-reporting self-test, not representative of production. Drop the `nix-functional-tests` derivation from whatever pulls it in, or set `doCheck = false` / `doInstallCheck = false` on the Determinate Nix package in your overlay.
Need the test to pass here	Run it in a throwaway environment with `ptrace_scope = 0` (security downgrade — don't leave it set).
Best of both	Not user-fixable: requires upstream Determinate Nix to use Crashpad/Breakpad with `prctl(PR_SET_PTRACER, …)` so the handler is whitelisted regardless of `ptrace_scope`. Worth filing upstream.

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Uh oh!

nix sentry test (part of nix-functional-tests-3.21.5) fails in NixOS unstable when sudo sysctl -w kernel.yama.ptrace_scope=2 instead of sudo sysctl -w kernel.yama.ptrace_scope=0 #1854

Verdict: there is no real crash — the `sentry` test fails because your kernel hardening blocks the crash reporter

The smoking gun

Root cause chain (with evidence)

Why it's not a NixOS-unstable regression

How to verify (proof)

Recommended fixes

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Uh oh!

nix sentry test (part of nix-functional-tests-3.21.5) fails in NixOS unstable when sudo sysctl -w kernel.yama.ptrace_scope=2 instead of sudo sysctl -w kernel.yama.ptrace_scope=0 #1854

Description

Verdict: there is no real crash — the sentry test fails because your kernel hardening blocks the crash reporter

The smoking gun

Root cause chain (with evidence)

Why it's not a NixOS-unstable regression

How to verify (proof)

Recommended fixes

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions

Verdict: there is no real crash — the `sentry` test fails because your kernel hardening blocks the crash reporter