https://bugs.kde.org/show_bug.cgi?id=492255
Bug ID: 492255
Summary: Hangs before main() on any code compiled with clang
-fsanitize=memory
Classification: Developer tools
Product: valgrind
Version: 3.20.0
Platform: Debian unstable
OS: Linux
Status: REPORTED
Severity: grave
Priority: NOR
Component: memcheck
Assignee: jsew...@acm.org
Reporter: marko.mak...@iki.fi
Target Milestone: ---
SUMMARY
Valgrind gets into a seemingly infinite loop when executing a trivial program
that was compiled with clang -fsanitize=memory (MemorySanitizer).
STEPS TO REPRODUCE
1. echo "int main(){return 0;}" > m.c
2. clang -fsanitize=memory m.c
3. valgrind ./a.out
OBSERVED RESULT
==1186257== Memcheck, a memory error detector
==1186257== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al.
==1186257== Using Valgrind-3.20.0 and LibVEX; rerun with -h for copyright info
==1186257== Command: ./a.out
==1186257==
==1186257== Warning: set address range perms: large range [0x10000000000,
0x100000000000) (defined)
This is followed by 100% CPU usage in Valgrind, inside a call stack that
includes multiple avl_insert() inside vgSysWrap_amd64_linux_sys_mmap_before().
EXPECTED RESULT
Valgrind should refuse to run the program, similar to when -fsanitize=address
is used:
==1186156== Memcheck, a memory error detector
==1186156== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al.
==1186156== Using Valgrind-3.20.0 and LibVEX; rerun with -h for copyright info
==1186156== Command: ./a.out
==1186156==
==1186156==Shadow memory range interleaves with an existing memory mapping.
ASan cannot proceed correctly. ABORTING.
==1186156==ASan shadow was supposed to be located in the
[0x00007fff7000-0x10007fff7fff] range.
==1186156==This might be related to ELF_ET_DYN_BASE change in Linux 4.12.
==1186156==See https://github.com/google/sanitizers/issues/856 for possible
workarounds.
==1186156==Process memory map follows:
…
==1186156==End of process memory map.
==1186156==
==1186156== HEAP SUMMARY:
==1186156== in use at exit: 0 bytes in 0 blocks
==1186156== total heap usage: 86 allocs, 86 frees, 2,737 bytes allocated
==1186156==
==1186156== All heap blocks were freed -- no leaks are possible
==1186156==
==1186156== For lists of detected and suppressed errors, rerun with: -s
==1186156== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
SOFTWARE/OS VERSIONS
dpkg --status valgrind|grep Version
Version: 1:3.20.0-2.1
dpkg --status clang-18|grep Version
Version: 1:18.1.8-9
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