tests/ui/sanitize/leak.rs fails on Linux with `sanitizers = true`

[danakj]

Chromium bug discussion here: https://bugs.chromium.org/p/chromium/issues/detail?id=1441181#c5

We want to build rustc with sanitizers = true in config.toml in order to get sanitizer runtimes. However when we do, the leak.rs test fails with a CHECK failure in LLVM.

error: error pattern ' LeakSanitizer: detected memory leaks' not found!
status: exit status: 23
command: cd "/home/danakj/s/c/src/third_party/rust_src/src/build/x86_64-unknown-linux-gnu/test/ui/sanitize/leak" && RUST_TEST_THREADS="72" "/home/danakj/s/c/src/third_party/rust_src/src/build/x86_64-unknown-linux-gnu/test/ui/sanitize/leak/a"
stdout: none
--- stderr -------------------------------
LeakSanitizer: CHECK failed: lsan_interceptors.cpp:82 "((!lsan_init_is_running)) != (0)" (0x0, 0x0) (tid=309157)
------------------------------------------

Which is failing a check inside the ENSURE_LSAN_INITED macro here: https://github.com/llvm/llvm-project/blob/89a44b0faee0ca6b741e1f0ef31163374887b6ed/compiler-rt/lib/lsan/lsan_interceptors.cpp#L82

We're building against LLVM HEAD-ish, so I tried with upstream rustc and the test fails when compiled with that as well (reduced command line from the actual test invocation):

% rustc --version
rustc 1.71.0-nightly (9ecda8de8 2023-04-30)
% rustc ~/s/c/src/third_party/rust_src/src/tests/ui/sanitize/leak.rs -Zthreads=1 --target=x86_64-unknown-linux-gnu --error-format json --json future-incompat -Ccodegen-units=1 -Zui-testing -o ~/s/c/src/third_party/rust_src/src/build/x86_64-unknown-linux-gnu/test/ui/sanitize/leak/a -A unused -Crpath -Z sanitizer=leak -O
% cd ~/s/c/src/third_party/rust_src/src/build/x86_64-unknown-linux-gnu/test/ui/sanitize/leak && RUST_TEST_THREADS="72" ~/s/c/src/third_party/rust_src/src/build/x86_64-unknown-linux-gnu/test/ui/sanitize/leak/a
LeakSanitizer: CHECK failed: lsan_interceptors.cpp:82 "((!lsan_init_is_running)) != (0)" (0x0, 0x0) (tid=911869)

[aaronmondal]

Been running into this for a while as well. This breaks both the leak sanitizer in rules_ll and prevents turbo-cache from using leak sanitizer.

@danakj Did you find out anything that could be helpful here yet?

[danakj]

Sorry no I have not looked further. For Chromium, we ended up using Clang's sanitizer runtimes and just making empty archive placeholders for the Rust ones (as we can't have both anyway).

[nikic]

Backtrace:

Breakpoint 1, 0x0000555555565dc0 in __sanitizer::CheckFailed(char const*, int, char const*, unsigned long long, unsigned long long) ()
(gdb) bt
#0  0x0000555555565dc0 in __sanitizer::CheckFailed(char const*, int, char const*, unsigned long long, unsigned long long) ()
#1  0x000055555557ddc5 in __interceptor_free ()
#2  0x00007ffff7c70dfc in dl_error_free (ptr=<optimized out>) at ./dlerror.h:54
#3  dl_action_result_errstring_free (result=<optimized out>) at ./dlerror.h:72
#4  dl_action_result_errstring_free (result=0x7ffff6f00780) at ./dlerror.h:65
#5  _dlerror_run (operate=operate@entry=0x7ffff7c71320 <dlsym_doit>, 
    args=args@entry=0x7fffffffde90) at dlerror.c:183
#6  0x00007ffff7c713c5 in dlsym_implementation (dl_caller=<optimized out>, name=<optimized out>, 
    handle=<optimized out>) at dlsym.c:54
#7  ___dlsym (handle=<optimized out>, name=<optimized out>) at dlsym.c:68
#8  0x0000555555557422 in __interception::InterceptFunction(char const*, unsigned long*, unsigned long, unsigned long) ()
#9  0x000055555557d78d in __lsan::InitializeInterceptors() ()
#10 0x000055555557715b in __lsan_init ()
#11 0x00007ffff7fcce12 in _dl_init (main_map=0x7ffff7ffe2c0, argc=1, argv=0x7fffffffdf88, 
    env=0x7fffffffdf98) at dl-init.c:102
#12 0x00007ffff7fe38e0 in _dl_start_user () from /lib64/ld-linux-x86-64.so.2

We can see that we end up calling __interceptor_free as part of __lsan_init via __dlsym.

[Jules-Bertholet]

@rustbot label A-sanitizers

[intgr]

rustix project also fails to build with LeakSanitizer. Repro:

git clone https://github.com/bytecodealliance/rustix
cd rustix
rustup override set nightly
RUSTFLAGS="-Z sanitizer=leak" cargo build

Output:

[...]
   Compiling rustix v0.38.32 (/home/marti/src/rustix)
   Compiling linux-raw-sys v0.4.13
   Compiling bitflags v2.5.0
error: failed to run custom build command for `rustix v0.38.32 (/home/marti/src/rustix)`

Caused by:
  process didn't exit successfully: `rustix/target/debug/build/rustix-dad2410e95903b2f/build-script-build` (exit status: 23)
  --- stderr
  LeakSanitizer: CHECK failed: lsan_interceptors.cpp:82 "((!lsan_init_is_running)) != (0)" (0x0, 0x0) (tid=75319)

[tmiasko]

When linking a static sanitizer runtime clang also adds --dynamic-list=... or --export-dynamic.

-Clink-args=--export-dynamic or -Zexport-executable-symbols can be used as a workaround in rustc.

[tmiasko]

Should be fixed by llvm/llvm-project#106912.