Hello, syzbot found the following issue on: HEAD commit: acc4d5ff0b61 Merge tag 'net-6.15-rc0' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14e6694c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=845c633207fbfb03 dashboard link: https://syzkaller.appspot.com/bug?extid=8f77ff6144a73f0cf71b compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/2e1f70d143e1/disk-acc4d5ff.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1e092d734e65/vmlinux-acc4d5ff.xz kernel image: https://storage.googleapis.com/syzbot-assets/7a8aec6915ea/bzImage-acc4d5ff.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8f77ff6144a73f0cf71b@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in crc32_be_base+0x255/0x2b0 lib/crc32.c:131 crc32_be_base+0x255/0x2b0 lib/crc32.c:131 crc32_be_arch+0x3d/0x50 arch/x86/lib/crc32-glue.c:77 crc32_be include/linux/crc32.h:28 [inline] sw842_decompress+0x167d/0x1840 lib/842/842_decompress.c:385 crypto842_sdecompress+0x45/0x60 crypto/842.c:57 scomp_acomp_comp_decomp+0xa8d/0xd90 crypto/scompress.c:-1 scomp_acomp_chain crypto/scompress.c:297 [inline] scomp_acomp_decompress+0x39/0x1e0 crypto/scompress.c:313 acomp_do_req_chain+0x39a/0x9f0 crypto/acompress.c:353 crypto_acomp_decompress+0x5f/0x80 crypto/acompress.c:378 zswap_decompress+0x561/0xe00 mm/zswap.c:1018 zswap_load+0x296/0x660 mm/zswap.c:1678 swap_read_folio+0x691/0x3290 mm/page_io.c:643 swap_cluster_readahead+0xb48/0xbd0 mm/swap_state.c:638 swapin_readahead+0x205/0x1690 mm/swap_state.c:814 do_swap_page+0x982/0x9c50 mm/memory.c:4532 handle_pte_fault mm/memory.c:6000 [inline] __handle_mm_fault mm/memory.c:6140 [inline] handle_mm_fault+0x3ea4/0xe360 mm/memory.c:6309 do_user_addr_fault arch/x86/mm/fault.c:1337 [inline] handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x41e/0x750 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623 Uninit was created at: __alloc_frozen_pages_noprof+0x6a0/0xe30 mm/page_alloc.c:4957 alloc_pages_mpol+0x4cd/0x890 mm/mempolicy.c:2301 folio_alloc_mpol_noprof+0x57/0x1c0 mm/mempolicy.c:2320 __read_swap_cache_async+0x2b6/0x980 mm/swap_state.c:403 swap_cluster_readahead+0xa94/0xbd0 mm/swap_state.c:635 swapin_readahead+0x205/0x1690 mm/swap_state.c:814 do_swap_page+0x982/0x9c50 mm/memory.c:4532 handle_pte_fault mm/memory.c:6000 [inline] __handle_mm_fault mm/memory.c:6140 [inline] handle_mm_fault+0x3ea4/0xe360 mm/memory.c:6309 do_user_addr_fault arch/x86/mm/fault.c:1337 [inline] handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x41e/0x750 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623 CPU: 0 UID: 0 PID: 25609 Comm: dhcpcd Not tainted 6.14.0-syzkaller-12456-gacc4d5ff0b61 #0 PREEMPT(undef) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
