[Bug target/110027] Misaligned vector store on detect_stack_use_after_return
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110027 --- Comment #10 from Christoph Erhardt --- I have just verified that the reproducer program I attached above (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110027#c4) still crashes as expected on Fedora 39 with GCC 13.2.1. It's not super-tiny, but it fails reliably. :-)
[Bug middle-end/110027] [11/12 regression] Stack objects with extended alignments (vectors etc) misaligned on detect_stack_use_after_return
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110027 Christoph Erhardt changed: What|Removed |Added Attachment #56169|0 |1 is obsolete|| --- Comment #26 from Christoph Erhardt --- Created attachment 58325 --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 0x00401463 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
[Bug target/110027] Misaligned vector store on detect_stack_use_after_return
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110027 Christoph Erhardt changed: What|Removed |Added CC||gcc at sicherha dot de --- Comment #4 from Christoph Erhardt --- Created attachment 56169 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56169&action=edit Reproducer program Here's a program that can reproduce this issue more reliably - tested on Fedora 38, Ubuntu 23.04 and Ubuntu 23.10. I have stripped down the code as far as possible. This is how far I could get without losing reproducibility. Sources are in a GitHub repo: https://github.com/sicherha/gcc-asan-stack-misalign $ gcc -Wall -Wextra -g -Og -fsanitize=address -fno-stack-protector -mavx512f a-repro.i $ ./a.out AddressSanitizer:DEADLYSIGNAL = ==3618==ERROR: AddressSanitizer: SEGV on unknown address (pc 0x00401789 bp 0x7ffeabbcda00 sp 0x7ffeabbcd580 T0) ==3618==The signal is caused by a READ memory access. ==3618==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 0x401789 in blake3_compress_subtree_wide /home/ul26967/Projects/gcc-asan-stack-misalign/a-repro.i:481 #1 0x40189b in main /home/ul26967/Projects/gcc-asan-stack-misalign/a-repro.i:488 #2 0x7f77a0210b89 in __libc_start_call_main (/lib64/libc.so.6+0x27b89) (BuildId: 3ebe8d97a0ed3e1f13476a02665c5a9442adcd78) #3 0x7f77a0210c4a in __libc_start_main_alias_2 (/lib64/libc.so.6+0x27c4a) (BuildId: 3ebe8d97a0ed3e1f13476a02665c5a9442adcd78) #4 0x4010f4 in _start (/home/ul26967/Projects/gcc-asan-stack-misalign/a.out+0x4010f4) (BuildId: e25b3ac48fa6dd8cff5d228e201834fa1b0cd18a) AddressSanitizer can not provide additional info. SUMMARY: AddressSanitizer: SEGV /home/ul26967/Projects/gcc-asan-stack-misalign/a-repro.i:481 in blake3_compress_subtree_wide ==3618==ABORTING
