Sanitizer test regressions (mostly ASAN)

[mgorny]

I've noticed them around the beginning of January (I'm sorry for not reporting earlier), they don't seem to related to any change in LLVM (i.e. once they started appearing, they happened with older versions as well):

Failed Tests (39):
  AddressSanitizer-i386-linux :: TestCases/printf-2.c
  AddressSanitizer-i386-linux :: TestCases/printf-3.c
  AddressSanitizer-i386-linux :: TestCases/printf-5.c
  AddressSanitizer-i386-linux :: TestCases/strcat-overlap.cpp
  AddressSanitizer-i386-linux :: TestCases/strcpy-overlap.cpp
  AddressSanitizer-i386-linux :: TestCases/strncat-overlap.cpp
  AddressSanitizer-i386-linux :: TestCases/strncpy-overflow.cpp
  AddressSanitizer-i386-linux :: TestCases/strncpy-overlap.cpp
  AddressSanitizer-i386-linux-dynamic :: TestCases/printf-2.c
  AddressSanitizer-i386-linux-dynamic :: TestCases/printf-3.c
  AddressSanitizer-i386-linux-dynamic :: TestCases/printf-5.c
  AddressSanitizer-i386-linux-dynamic :: TestCases/strcat-overlap.cpp
  AddressSanitizer-i386-linux-dynamic :: TestCases/strcpy-overlap.cpp
  AddressSanitizer-i386-linux-dynamic :: TestCases/strncat-overlap.cpp
  AddressSanitizer-i386-linux-dynamic :: TestCases/strncpy-overflow.cpp
  AddressSanitizer-i386-linux-dynamic :: TestCases/strncpy-overlap.cpp
  AddressSanitizer-x86_64-linux :: TestCases/printf-2.c
  AddressSanitizer-x86_64-linux :: TestCases/printf-3.c
  AddressSanitizer-x86_64-linux :: TestCases/printf-5.c
  AddressSanitizer-x86_64-linux :: TestCases/strcat-overlap.cpp
  AddressSanitizer-x86_64-linux :: TestCases/strcpy-overlap.cpp
  AddressSanitizer-x86_64-linux :: TestCases/strncat-overlap.cpp
  AddressSanitizer-x86_64-linux :: TestCases/strncpy-overflow.cpp
  AddressSanitizer-x86_64-linux :: TestCases/strncpy-overlap.cpp
  AddressSanitizer-x86_64-linux-dynamic :: TestCases/printf-2.c
  AddressSanitizer-x86_64-linux-dynamic :: TestCases/printf-3.c
  AddressSanitizer-x86_64-linux-dynamic :: TestCases/printf-5.c
  AddressSanitizer-x86_64-linux-dynamic :: TestCases/strcat-overlap.cpp
  AddressSanitizer-x86_64-linux-dynamic :: TestCases/strcpy-overlap.cpp
  AddressSanitizer-x86_64-linux-dynamic :: TestCases/strncat-overlap.cpp
  AddressSanitizer-x86_64-linux-dynamic :: TestCases/strncpy-overflow.cpp
  AddressSanitizer-x86_64-linux-dynamic :: TestCases/strncpy-overlap.cpp
  DataFlowSanitizer-x86_64 :: custom.cpp
  DataFlowSanitizer-x86_64 :: origin_unaligned_memtrans.c
  MemorySanitizer-X86_64 :: chained_origin_memcpy.cpp
  MemorySanitizer-X86_64 :: chained_origin_memmove.cpp
  ThreadSanitizer-x86_64 :: exceptions.cpp
  ThreadSanitizer-x86_64 :: fiber_longjmp.cpp
  ThreadSanitizer-x86_64 :: signal_longjmp.cpp

Gentoo Linux amd64
Kernel: 6.1.8-gentoo-dist
glibc: 2.36-r7
systemd: 252.5 (testing is done in nspawn container)

Full log (2.5M): sys-libs:compiler-rt-sanitizers-16.0.0_rc1:20230130-193656.log

[vitalybuka]

I guess it's not a regression, but something changed in glibc.

[mgorny]

I thought that it was maybe the kernel but 5.15.90 fails the same (unless it was a kernel change backported to 5.15 ;-)).

[mgorny]

I have seen the same set of failures on 2023-01-12 (on top of 6dc85bd) but almost all tests passed on 2023-01-08 (with the same commit). I did not upgrade glibc during that period.

[mgorny]

I see the same failures outside the nspawn container, so it's not that either. I've checked install logs for the aforementioned period and I don't see anything obvious that could have caused this — so most likely it was some kernel change that was backported to 5.15. Unfortunately, I don't have the old kernel binpkgs around anymore.

[thesamesam]

Posted https://reviews.llvm.org/D143322. We may want to file another bug for the remaining 3 issues I get (no idea if mgorny gets them yet).

[mgorny]

I can confirm that the patch fixes all test failures for me.