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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: 580d, last: 4h07m
▶ ▼ Discussions (15)
Title Replies (including bot) Last reply
[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] [ntfs3?] KMSAN: uninit-value in longest_match_std (2) 0 (2) 2025/01/29 05:28
[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 652d 760d 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 890d 1242d 22/29 fixed on 2023/02/24 13:50
upstream KMSAN: uninit-value in __crc32c_le_base (2) crypto 7 C 6207 852d 1924d 0/29 closed as invalid on 2023/04/06 23:31
upstream KMSAN: kernel-infoleak in _copy_to_iter (8) mm 23 C 21180 786d 880d 22/29 fixed on 2023/06/08 14:41
▶ ▼ Last patch testing requests (9)
Created Duration User Patch Repo Result
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 (15854):
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
2025/08/02 22:33 upstream 89748acdf226 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/08/02 16:43 upstream 89748acdf226 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/08/02 12:02 upstream 89748acdf226 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/08/02 10:42 upstream 89748acdf226 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/08/02 08:50 upstream 89748acdf226 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/08/02 08:50 upstream 89748acdf226 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/08/02 03:42 upstream 89748acdf226 40127d41 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/08/02 02:14 upstream 89748acdf226 40127d41 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/08/01 21:18 upstream 89748acdf226 40127d41 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/08/01 05:57 upstream f2d282e1dfb3 0c075d67 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/31 22:43 upstream 260f6f4fda93 0c075d67 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/31 21:29 upstream 260f6f4fda93 0c075d67 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/31 18:45 upstream 260f6f4fda93 0c075d67 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/31 17:29 upstream 260f6f4fda93 0c075d67 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/31 15:32 upstream 260f6f4fda93 0c075d67 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/31 12:10 upstream e8d780dcd957 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/31 10:48 upstream e8d780dcd957 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/31 10:44 upstream e8d780dcd957 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/31 09:35 upstream e8d780dcd957 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/31 05:11 upstream e8d780dcd957 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/31 03:14 upstream e8d780dcd957 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/31 01:31 upstream e8d780dcd957 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/31 00:31 upstream e8d780dcd957 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/30 22:16 upstream 4b290aae788e f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/30 20:50 upstream 4b290aae788e f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/30 15:59 upstream 4b290aae788e f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/30 14:42 upstream 4b290aae788e f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/30 13:01 upstream 4b290aae788e f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/30 11:53 upstream 4b290aae788e f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/30 11:20 upstream 4b290aae788e f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/30 08:50 upstream 86aa72182095 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/30 07:32 upstream 86aa72182095 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/30 03:19 upstream 86aa72182095 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/30 02:10 upstream 86aa72182095 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/07/30 01:55 upstream 86aa72182095 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in longest_match_std
2025/08/02 18:00 upstream a6923c06a3b2 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/08/02 00:26 upstream 89748acdf226 40127d41 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/08/01 18:25 upstream 89748acdf226 40127d41 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/08/01 09:25 upstream f2d282e1dfb3 0c075d67 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/08/01 09:19 upstream f2d282e1dfb3 0c075d67 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/08/01 08:04 upstream f2d282e1dfb3 0c075d67 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/08/01 06:59 upstream f2d282e1dfb3 0c075d67 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/08/01 03:26 upstream 260f6f4fda93 0c075d67 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/08/01 01:50 upstream 260f6f4fda93 0c075d67 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/07/31 19:27 upstream 260f6f4fda93 0c075d67 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/07/31 07:36 upstream e8d780dcd957 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/07/30 00:33 upstream 86aa72182095 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in longest_match_std
2025/07/30 00:14 upstream 86aa72182095 f8f2b4da .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.