Bug 58819 - Jammed: Clang's ThreadSanitizer, Mono and make
Summary: Jammed: Clang's ThreadSanitizer, Mono and make
Status: NEW
Alias: None
Product: Runtime
Classification: Mono
Component: General ()
Version: unspecified
Hardware: PC Windows
: --- normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2017-08-16 16:04 UTC by Armin
Modified: 2017-08-16 18:00 UTC (History)
3 users (show)

Is this bug a regression?: ---
Last known good build:

Stack traces (35.38 KB, text/plain)
2017-08-16 16:04 UTC, Armin

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Description Armin 2017-08-16 16:04:18 UTC
Created attachment 24245 [details]
Stack traces

When building Mono with the ThreadSanitizer's injected functions, `make` never completes; as soon as it gets to the part where Roslyn tries to build the dlls, the runtime gets stuck. The corresponding (captured) stack traces of all threads during such a jam can be found attached.

The following code reproduces this issue reliably:

$ git clean -xffd
$ ./autogen.sh --prefix=/usr/local CC=clang CFLAGS="-fsanitize=thread" LDFLAGS=-fsanitize=thread CXX=clang++
$ make
$ # wait until mscorlib.dll has been built successfully (sometimes even mscorlib.dll does not complete, however most of the times it does) ...
Comment 1 Bernhard Urban 2017-08-16 18:00:09 UTC
I suspect that TSan messes around with our signal handler in some way. For reference: https://github.com/llvm-mirror/compiler-rt/blob/f728f46988ea1fc5c921dfdf53eea02a1050f80e/lib/tsan/rtl/tsan_interceptors.cc#L1823