* Re: [syzbot] [mm] KMSAN: uninit-value in sw842_compress
[not found] <CAPqLRf0D2bzcZ-c4RAmhX2vB9ZDxA3e5M1TVXBnMjokXSQm2Xw@mail.gmail.com>
@ 2025-10-23 9:55 ` syzbot
0 siblings, 0 replies; 3+ messages in thread
From: syzbot @ 2025-10-23 9:55 UTC (permalink / raw)
To: kubik.bartlomiej, linux-kernel, syzkaller-bugs
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KMSAN: uninit-value in sw842_decompress
=====================================================
BUG: KMSAN: uninit-value in crc32_be_base lib/crc/crc32-main.c:46 [inline]
BUG: KMSAN: uninit-value in crc32_be+0x215/0x270 lib/crc/crc32-main.c:80
crc32_be_base lib/crc/crc32-main.c:46 [inline]
crc32_be+0x215/0x270 lib/crc/crc32-main.c:80
sw842_decompress+0x2223/0x23e0 lib/842/842_decompress.c:385
crypto842_sdecompress+0x46/0x60 crypto/842.c:53
scomp_acomp_comp_decomp+0xa49/0x1120 include/crypto/internal/scompress.h:-1
scomp_acomp_decompress+0x30/0x40 crypto/scompress.c:287
crypto_acomp_decompress+0x5b4/0xe80 crypto/acompress.c:303
zswap_decompress+0x684/0xf40 mm/zswap.c:968
zswap_load+0x262/0x570 mm/zswap.c:1628
swap_read_folio+0x662/0x3050 mm/page_io.c:637
swap_cluster_readahead+0xa8c/0xb20 mm/swap_state.c:672
swapin_readahead+0x1d9/0x15b0 mm/swap_state.c:813
do_swap_page+0xce9/0x9c40 mm/memory.c:4713
handle_pte_fault mm/memory.c:6180 [inline]
__handle_mm_fault mm/memory.c:6318 [inline]
handle_mm_fault+0x4100/0xded0 mm/memory.c:6487
do_user_addr_fault+0x1777/0x2550 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x74/0xc0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:618
Uninit was created at:
__alloc_frozen_pages_noprof+0x689/0xf00 mm/page_alloc.c:5206
alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2416
folio_alloc_mpol_noprof+0x56/0x1d0 mm/mempolicy.c:2435
__read_swap_cache_async+0x1f9/0x770 mm/swap_state.c:440
swap_cluster_readahead+0xa0d/0xb20 mm/swap_state.c:669
swapin_readahead+0x1d9/0x15b0 mm/swap_state.c:813
do_swap_page+0xce9/0x9c40 mm/memory.c:4713
handle_pte_fault mm/memory.c:6180 [inline]
__handle_mm_fault mm/memory.c:6318 [inline]
handle_mm_fault+0x4100/0xded0 mm/memory.c:6487
do_user_addr_fault+0x1777/0x2550 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x74/0xc0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:618
CPU: 1 UID: 0 PID: 4809 Comm: dhcpcd Not tainted syzkaller #0 PREEMPT(none)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
=====================================================
Tested on:
commit: 43e9ad0c Merge tag 'scsi-fixes' of git://git.kernel.or..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=172213e2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=42e68cb86cfb456e
dashboard link: https://syzkaller.appspot.com/bug?extid=17cae3c0a5b0acdc327d
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch: https://syzkaller.appspot.com/x/patch.diff?x=13b8b734580000
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[parent not found: <CAPqLRf3gQMhkX9_Kvh++58PosdA9J29Hx-7baE0sg2R-B6vYLg@mail.gmail.com>]
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[not found] <CAPqLRf0D2bzcZ-c4RAmhX2vB9ZDxA3e5M1TVXBnMjokXSQm2Xw@mail.gmail.com>
2025-10-23 9:55 ` [syzbot] [mm] KMSAN: uninit-value in sw842_compress syzbot
[not found] <CAPqLRf0ab_gT9w9gphrW8TnNdPHsQErWP4Aqen8o47OqDrEOrA@mail.gmail.com>
2025-10-22 21:36 ` syzbot
[not found] <CAPqLRf3gQMhkX9_Kvh++58PosdA9J29Hx-7baE0sg2R-B6vYLg@mail.gmail.com>
2025-10-22 4:48 ` syzbot
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