[Bug 1927530] Re: qemu-aarch64 MTE fails to report tag mismatch

[Richard Henderson]

*** This bug is a duplicate of bug 1921948 ***
    https://bugs.launchpad.net/bugs/1921948

You missed including libstdc++.so.6.
I ran with whatever libstdc++ I had lying around.

With qemu head, this terminates with

~/qemu/bld/qemu-aarch64 -L . ./bitfield-2.exe 
*** stack smashing detected ***: terminated
qemu: uncaught target signal 6 (Aborted) - core dumped
Aborted

I suspect the relevant MTE portion of this bug report
to be a duplicate of a kasan bug, the fix for which did
not make 6.0, but has since been committed as 09641ef93112.

** This bug has been marked a duplicate of bug 1921948
   MTE tags not checked properly for unaligned accesses at EL1

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https://bugs.launchpad.net/bugs/1927530

Title:
  qemu-aarch64 MTE fails to report tag mismatch

Status in QEMU:
  New

Bug description:
  Hi,

  While running the GCC testsuite with qemu-6.0 as simulator, I noticed
  several errors in the hwasan testsuite (output pattern tests).

  I am attaching:
  bitfield-2.exe
  ld-linux-aarch64.so.1
  libc.so.6
  libdl.so.2
  libhwasan.so.0
  libm.so.6
  libpthread.so.0
  librt.so.1

  The testcase can be executed via:
  qemu-aarch64 -L . bitfield-2.exe

  it currently generates:
  HWAddressSanitizer:DEADLYSIGNAL
  ==21137==ERROR: HWAddressSanitizer: SEGV on unknown address 0x0000000000f0 
(pc 0x00550084e318 bp 0x005f01650d00 sp 0x005f01650d00 T21137)
  ==21137==The signal is caused by a UNKNOWN memory access.
  ==21137==Hint: address points to the zero page.
      #0 0x550084e318 in GetAccessInfo 
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/libsanitizer/hwasan/hwasan_linux.cpp:339
      #1 0x550084e318 in HwasanOnSIGTRAP 
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/libsanitizer/hwasan/hwasan_linux.cpp:401
      #2 0x550084e318 in __hwasan::HwasanOnDeadlySignal(int, void*, void*) 
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/libsanitizer/hwasan/hwasan_linux.cpp:426
      #3 0x5f01651fec  (<unknown module>)
      #4 0x550084b508 in __hwasan_load2 
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/libsanitizer/hwasan/hwasan.cpp:379
      #5 0x400768 in f 
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/gcc/testsuite/c-c++-common/hwasan/bitfield-2.c:17
      #6 0x4007d0 in main 
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/gcc/testsuite/c-c++-common/hwasan/bitfield-2.c:24
      #7 0x550124cee0 in __libc_start_main ../csu/libc-start.c:308
      #8 0x400688  
(/home/christophe.lyon/qemu-bug-hwasan-aarch64/bitfield-2.exe+0x400688)

  HWAddressSanitizer can not provide additional info.
  SUMMARY: HWAddressSanitizer: SEGV 
/home/christophe.lyon/src/GCC/sources/gcc-fsf-git/trunk/libsanitizer/hwasan/hwasan_linux.cpp:339
 in GetAccessInfo
  ==21146==ABORTING

  while the testcase expects HWAddressSanitizer: tag-mismatch on address
  0x.....

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