syzbot

 sign-in | mailing list | source | docs
🐞 Open [1464]
≡ Subsystems
🐞 Fixed [6817]
🐞 Invalid [17638]
⬇ Missing Backports [225]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
💬 Send us feedback

KMSAN: uninit-value in longest_match_std (2)

Status: upstream: reported C repro on 2024/01/09 18:17
Subsystems: ntfs3
[Documentation on labels]
Reported-by: syzbot+08d8956768c96a2c52cf@syzkaller.appspotmail.com
First crash: 728d, last: 1h52m
▶ ▼ Discussions (19)
Title Replies (including bot) Last reply
[PATCH] fs/ntfs3: Initialize new folios before use 2 (2) 2025/12/09 13:37
[syzbot] [ntfs3?] KMSAN: uninit-value in longest_match_std (2) 0 (3) 2025/11/19 14:24
[syzbot] Monthly ntfs3 report (Oct 2025) 0 (1) 2025/10/27 08:42
[syzbot] Monthly ntfs3 report (Sep 2025) 0 (1) 2025/09/25 16:00
[syzbot] Monthly ntfs3 report (Aug 2025) 0 (1) 2025/08/25 13:19
[syzbot] Monthly ntfs3 report (Jul 2025) 0 (1) 2025/07/25 12:39
[syzbot] Monthly ntfs3 report (Jun 2025) 0 (1) 2025/06/24 07:38
[syzbot] Monthly ntfs3 report (May 2025) 0 (1) 2025/05/24 10:04
[syzbot] Monthly ntfs3 report (Apr 2025) 0 (1) 2025/04/22 12:41
[syzbot] Monthly ntfs3 report (Mar 2025) 0 (1) 2025/03/18 14:49
Re: [syzbot] [ntfs3?] KMSAN: uninit-value in longest_match_std (2) 1 (2) 2025/02/03 08:14
[syzbot] Monthly ntfs3 report (Jan 2025) 0 (1) 2025/01/15 08:54
[syzbot] Monthly ntfs3 report (Dec 2024) 0 (1) 2024/12/16 09:44
[syzbot] Monthly ntfs3 report (Nov 2024) 0 (1) 2024/11/13 11:07
[syzbot] Monthly ntfs3 report (Jun 2024) 0 (1) 2024/06/10 12:41
[syzbot] Monthly ntfs3 report (May 2024) 0 (1) 2024/05/06 13:18
[syzbot] Monthly ntfs3 report (Apr 2024) 0 (1) 2024/04/05 12:38
[syzbot] Monthly ntfs3 report (Mar 2024) 0 (1) 2024/03/05 11:09
[syzbot] Monthly ntfs3 report (Feb 2024) 0 (1) 2024/02/02 21:04
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in longest_match_std ntfs3 7 1360 800d 907d 0/29 auto-obsoleted due to no activity on 2023/12/09 02:47
upstream KMSAN: kernel-infoleak in _copy_to_iter (7) net 23 C 138977 1037d 1390d 22/29 fixed on 2023/02/24 13:50
upstream KMSAN: uninit-value in __crc32c_le_base (2) crypto 7 C 6207 1000d 2072d 0/29 closed as invalid on 2023/04/06 23:31
upstream KMSAN: kernel-infoleak in _copy_to_iter (8) mm 23 C 21180 933d 1028d 22/29 fixed on 2023/06/08 14:41
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2025/11/19 14:24 28m kubik.bartlomiej@gmail.com patch upstream OK log
2025/02/03 07:29 28m gauthamgujjula@gmail.com patch upstream error
2025/01/29 05:28 5h12m gauthamgujjula@gmail.com patch upstream error
2024/09/07 20:13 28m retest repro upstream OK log
2024/09/07 20:13 33m retest repro upstream OK log
2024/08/05 19:45 27m retest repro upstream OK log
2024/08/05 19:45 27m retest repro upstream OK log
2024/08/05 19:45 30m retest repro upstream OK log
2024/06/29 19:30 22m retest repro upstream error
2024/06/29 19:30 22m retest repro upstream error

Sample crash report:
=====================================================
BUG: KMSAN: uninit-value in get_match_len fs/ntfs3/lznt.c:43 [inline]
BUG: KMSAN: uninit-value in longest_match_std+0x56e/0xe00 fs/ntfs3/lznt.c:64
 get_match_len fs/ntfs3/lznt.c:43 [inline]
 longest_match_std+0x56e/0xe00 fs/ntfs3/lznt.c:64
 compress_chunk fs/ntfs3/lznt.c:170 [inline]
 compress_lznt+0x414/0xef0 fs/ntfs3/lznt.c:339
 ni_write_frame+0x1032/0x1e10 fs/ntfs3/frecord.c:2779
 ntfs_compress_write+0x265e/0x3a20 fs/ntfs3/file.c:1172
 ntfs_file_write_iter+0x9e9/0xfc0 fs/ntfs3/file.c:1286
 aio_write+0x72b/0x9d0 fs/aio.c:1633
 __io_submit_one fs/aio.c:-1 [inline]
 io_submit_one+0x283f/0x3280 fs/aio.c:2052
 __do_sys_io_submit fs/aio.c:2111 [inline]
 __se_sys_io_submit+0x275/0x700 fs/aio.c:2081
 __x64_sys_io_submit+0x96/0xe0 fs/aio.c:2081
 x64_sys_call+0xbed/0x3c80 arch/x86/include/generated/asm/syscalls_64.h:210
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 __alloc_frozen_pages_noprof+0x6a0/0xe30 mm/page_alloc.c:5005
 alloc_pages_mpol+0x4cd/0x890 mm/mempolicy.c:2301
 alloc_frozen_pages_noprof mm/mempolicy.c:2372 [inline]
 alloc_pages_noprof mm/mempolicy.c:2392 [inline]
 folio_alloc_noprof+0x1dc/0x350 mm/mempolicy.c:2402
 filemap_alloc_folio_noprof+0xa6/0x440 mm/filemap.c:1007
 __filemap_get_folio+0xb40/0x18e0 mm/filemap.c:1969
 ntfs_get_frame_pages+0xd8/0x6b0 fs/ntfs3/file.c:964
 ntfs_compress_write+0x1cd5/0x3a20 fs/ntfs3/file.c:1120
 ntfs_file_write_iter+0x9e9/0xfc0 fs/ntfs3/file.c:1286
 aio_write+0x72b/0x9d0 fs/aio.c:1633
 __io_submit_one fs/aio.c:-1 [inline]
 io_submit_one+0x283f/0x3280 fs/aio.c:2052
 __do_sys_io_submit fs/aio.c:2111 [inline]
 __se_sys_io_submit+0x275/0x700 fs/aio.c:2081
 __x64_sys_io_submit+0x96/0xe0 fs/aio.c:2081
 x64_sys_call+0xbed/0x3c80 arch/x86/include/generated/asm/syscalls_64.h:210
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 UID: 0 PID: 5815 Comm: syz-executor226 Not tainted 6.15.0-rc2-syzkaller-00087-gcfb2e2c57aef #0 PREEMPT(undef) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
=====================================================

Crashes (22193):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/04/17 19:54 upstream cfb2e2c57aef 2a6ededb .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/01/07 07:46 upstream fbfd64d25c7a f3558dbf .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2024/09/29 05:43 upstream 3efc57369a0c ba29ff75 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2024/07/21 23:31 upstream 2c9b3512402e b88348e9 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2024/07/21 21:07 upstream 2c9b3512402e b88348e9 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2024/07/21 15:24 upstream 2c9b3512402e b88348e9 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2024/04/12 02:09 upstream e8c39d0f57f3 478efa7f .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2024/01/02 15:04 upstream 610a9b8f49fb fb427a07 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/28 06:26 upstream d26143bb38e2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/28 01:47 upstream c53f467229a7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/28 00:46 upstream c53f467229a7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/27 20:42 upstream c53f467229a7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/27 20:29 upstream c53f467229a7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/27 19:29 upstream c53f467229a7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/27 11:47 upstream 3f0e9c8cefa9 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/27 09:38 upstream 3f0e9c8cefa9 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/27 06:11 upstream 3f0e9c8cefa9 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/27 03:01 upstream 3f0e9c8cefa9 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/26 22:32 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/26 18:02 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/26 17:00 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/26 15:39 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/26 14:24 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/26 13:08 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/26 11:58 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/26 11:18 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/26 10:14 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/26 06:12 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/26 04:29 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/26 03:22 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/26 01:29 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/25 23:29 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/25 19:57 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/25 18:15 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/25 17:31 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/25 16:16 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/25 13:48 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/25 11:48 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/25 09:34 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/25 06:34 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/25 05:06 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/25 03:43 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/12/28 08:07 upstream d26143bb38e2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/12/27 16:59 upstream c53f467229a7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/12/27 08:26 upstream 3f0e9c8cefa9 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/12/27 05:07 upstream 3f0e9c8cefa9 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/12/26 20:06 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/12/26 16:58 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/12/26 09:06 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/12/26 07:42 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/12/26 07:15 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/12/26 05:05 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/12/25 23:54 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/12/25 22:01 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/12/25 08:27 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2023/12/31 06:39 upstream 453f5db0619e fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
* Struck through repros no longer work on HEAD.