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WARNING in nilfs_segctor_do_construct

Status: upstream: reported C repro on 2026/04/24 08:03
Reported-by: syzbot+20ffb10c65422a9e0e7d@syzkaller.appspotmail.com
First crash: 4d04h, last: 10h34m
▶ ▼ Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 WARNING in nilfs_segctor_do_construct nilfs2 -1 C 1 1152d 1226d 0/1 upstream: reported C repro on 2022/12/18 15:02
linux-5.15 WARNING in nilfs_segctor_do_construct -1 C done 2 1054d 1075d 3/3 fixed on 2023/07/20 13:49
upstream WARNING in nilfs_segctor_do_construct (2) nilfs -1 C error 3 1081d 1079d 23/29 fixed on 2023/07/04 09:17
linux-6.1 WARNING in nilfs_segctor_do_construct -1 C done 2 1051d 1080d 3/3 fixed on 2023/07/26 10:02
upstream WARNING in nilfs_segctor_do_construct nilfs -1 C 5 1185d 1308d 22/29 fixed on 2023/02/24 13:50

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5928 at fs/buffer.c:1188 mark_buffer_dirty+0x2bb/0x4c0 fs/buffer.c:1188
Modules linked in:
CPU: 0 PID: 5928 Comm: segctord Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:mark_buffer_dirty+0x2bb/0x4c0 fs/buffer.c:1188
Code: 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 9f 9a fc ff e8 5a b6 88 ff 48 89 df 5b 41 5c 41 5e 41 5f 5d e9 ea 08 e8 ff e8 45 b6 88 ff <0f> 0b e9 84 fd ff ff e8 39 b6 88 ff 0f 0b e9 b0 fd ff ff e8 2d b6
RSP: 0018:ffffc900034876f0 EFLAGS: 00010293
RAX: ffffffff81fe6bbb RBX: ffff888059e41000 RCX: ffff88807a4c3c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffc90003487b01 R08: ffff888059e41007 R09: 1ffff1100b3c8200
R10: dffffc0000000000 R11: ffffed100b3c8201 R12: 1ffff1100b3c275c
R13: ffff888059e13af0 R14: ffff88802e69c328 R15: 1ffff1100b3c275e
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2a97e66aa2 CR3: 000000007832c000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 nilfs_segctor_collect_dirty_files fs/nilfs2/segment.c:2009 [inline]
 nilfs_segctor_do_construct+0x307/0x68a0 fs/nilfs2/segment.c:2071
 nilfs_segctor_construct+0x17b/0x690 fs/nilfs2/segment.c:2454
 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2562 [inline]
 nilfs_segctor_thread+0x536/0x10d0 fs/nilfs2/segment.c:2646
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>

Crashes (12):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/04/25 13:01 linux-6.6.y 9760bf04666d 9c2d0995 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-6-kasan WARNING in nilfs_segctor_do_construct
2026/04/28 02:24 linux-6.6.y 142cd8382222 ce741359 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in nilfs_segctor_do_construct
2026/04/27 17:44 linux-6.6.y 142cd8382222 0f700595 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in nilfs_segctor_do_construct
2026/04/27 17:44 linux-6.6.y 142cd8382222 0f700595 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in nilfs_segctor_do_construct
2026/04/25 03:07 linux-6.6.y 9760bf04666d 9c2d0995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in nilfs_segctor_do_construct
2026/04/25 03:07 linux-6.6.y 9760bf04666d 9c2d0995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in nilfs_segctor_do_construct
2026/04/25 03:05 linux-6.6.y 9760bf04666d 9c2d0995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in nilfs_segctor_do_construct
2026/04/24 22:00 linux-6.6.y 9760bf04666d 1c2b9291 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in nilfs_segctor_do_construct
2026/04/24 21:57 linux-6.6.y 9760bf04666d 1c2b9291 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in nilfs_segctor_do_construct
2026/04/24 21:57 linux-6.6.y 9760bf04666d 1c2b9291 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in nilfs_segctor_do_construct
2026/04/24 21:57 linux-6.6.y 9760bf04666d 1c2b9291 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in nilfs_segctor_do_construct
2026/04/24 08:02 linux-6.6.y 9760bf04666d 9cfb3ca7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in nilfs_segctor_do_construct
* Struck through repros no longer work on HEAD.