https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110027
Christoph Erhardt <gcc at sicherha dot de> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #56169|0 |1
is obsolete| |
--- Comment #26 from Christoph Erhardt <gcc at sicherha dot de> ---
Created attachment 58325
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=58325&action=edit
Reproducer program, new version
Unfortunately, the fix appears to be incomplete. On x86_64 Fedora Linux 40 with
the latest GCC 14.1.1, my reproducer program still segfaults with a misaligned
`vmovdqa64`.
I have managed to further strip the program down to a now-manageable size - see
attachment.
$ gcc -Wall -Wextra -g -Og -fsanitize=address -fno-stack-protector -mavx512f
a-repro.i
$ ./a.out
AddressSanitizer:DEADLYSIGNAL
=================================================================
==107156==ERROR: AddressSanitizer: SEGV on unknown address (pc 0x000000401463
bp 0x7ffd76144620 sp 0x7ffd76144200 T0)
==107156==The signal is caused by a READ memory access.
==107156==Hint: this fault was caused by a dereference of a high value address
(see register values below). Disassemble the provided pc to learn which
register was used.
#0 0x401463 in blake3_compress_subtree_wide
/home/christoph/Projects/gcc-asan-stack-misalign/repro.c:52
#1 0x40158c in main
/home/christoph/Projects/gcc-asan-stack-misalign/repro.c:57
#2 0x7f60dde3d087 in __libc_start_call_main (/lib64/libc.so.6+0x2a087)
(BuildId: 4a92fcedbba6d6d2629ce066a2970017faa9995e)
#3 0x7f60dde3d14a in __libc_start_main_alias_2 (/lib64/libc.so.6+0x2a14a)
(BuildId: 4a92fcedbba6d6d2629ce066a2970017faa9995e)
#4 0x4010b4 in _start
(/home/christoph/Projects/gcc-asan-stack-misalign/a.out+0x4010b4) (BuildId:
9f1d4d25413300b7347d0776d7087844a8d56649)
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV
/home/christoph/Projects/gcc-asan-stack-misalign/repro.c:52 in
blake3_compress_subtree_wide
==107156==ABORTING
