WARNING in ocfs2_unlink

Status: upstream: reported C repro on 2025/07/08 05:30
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+4f5e1fb963d07d760bfd@syzkaller.appspotmail.com
First crash: 417d, last: 7h30m
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2026/08/29 linux-6.1.y (ToT) d64a499eea6b C [report] WARNING in ocfs2_unlink
2025/07/08 upstream (ToT) d006330be3f7 C [report] WARNING in ocfs2_unlink
2026/08/29 upstream (ToT) cf72cbb39da8 C Didn't crash
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in ocfs2_unlink ocfs2 -1 syz, C inconclusive 139 259d 592d 29/29 fixed on 2026/01/07 12:29
linux-6.6 WARNING in ocfs2_unlink origin:upstream missing-backport -1 syz, C inconclusive 7 90d 301d 0/2 upstream: reported C repro on 2025/11/01 20:08
linux-5.15 WARNING in ocfs2_unlink origin:upstream -1 syz, C error 16 42d 596d 0/3 upstream: reported C repro on 2025/01/10 17:34
▶ ▼ Fix bisection attempts (4)
Created Duration User Patch Repo Result
2026/02/06 10:43 19m bisect fix linux-6.1.y error job log
2025/12/13 12:15 1h29m bisect fix linux-6.1.y OK (0) job log log
2025/10/19 20:47 2h43m bisect fix linux-6.1.y OK (0) job log log
2025/08/09 02:21 2h23m bisect fix linux-6.1.y OK (0) job log log

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4417 at fs/inode.c:332 drop_nlink+0xe4/0x138 fs/inode.c:332
Modules linked in:
CPU: 0 PID: 4417 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : drop_nlink+0xe4/0x138 fs/inode.c:332
lr : drop_nlink+0xe4/0x138 fs/inode.c:332
sp : ffff8000207d77e0
x29: ffff8000207d77e0 x28: 1fffe0001ca4b10f x27: ffff0000e5248878
x26: ffff0000e5248878 x25: ffff7000040faf10 x24: 0000000000000028
x23: 1fffe0001ca49118 x22: dfff800000000000 x21: 0000000000000000
x20: ffff0000e52488c0 x19: ffff0000e5248878 x18: 0000000000000000
x17: ffff8000181f9000 x16: ffff8000082d25ac x15: ffff800017cda000
x14: ffff0000d6675dd8 x13: 00000000258d0980 x12: 0000000000ff0100
x11: ff008000089fc818 x10: 0000000000000000 x9 : ffff8000089fc818
x8 : ffff0000d6675340 x7 : 00000000258d0980 x6 : 0000000000000028
x5 : ffff0000e5248900 x4 : ffff0000e52488f0 x3 : ffff800009d72ef4
x2 : 0000000000000010 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 drop_nlink+0xe4/0x138 fs/inode.c:332
 ocfs2_unlink+0xce4/0x15e4 fs/ocfs2/namei.c:1002
 vfs_rmdir+0x304/0x438 fs/namei.c:4199
 do_rmdir+0x238/0x50c fs/namei.c:4260
 __do_sys_unlinkat fs/namei.c:4440 [inline]
 __se_sys_unlinkat fs/namei.c:4434 [inline]
 __arm64_sys_unlinkat+0xcc/0xfc fs/namei.c:4434
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
irq event stamp: 166324
hardirqs last  enabled at (166323): [<ffff8000083bf6cc>] seqcount_lockdep_reader_access include/linux/seqlock.h:104 [inline]
hardirqs last  enabled at (166323): [<ffff8000083bf6cc>] ktime_get_coarse_real_ts64+0x114/0x244 kernel/time/timekeeping.c:2261
hardirqs last disabled at (166324): [<ffff80001195cc30>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (165908): [<ffff8000080309e0>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (165906): [<ffff8000080309ac>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/11/09 00:10 linux-6.1.y f6e38ae624cf 4e1406b4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-6-1-kasan-arm64 WARNING in ocfs2_unlink
2025/07/08 13:08 linux-6.1.y 04d1ccaa9c28 4f67c4ae .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-6-1-kasan-arm64 WARNING in ocfs2_unlink
2025/07/08 11:50 linux-6.1.y 04d1ccaa9c28 4f67c4ae .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-6-1-kasan-arm64 WARNING in ocfs2_unlink
2025/07/08 10:31 linux-6.1.y 04d1ccaa9c28 4f67c4ae .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-6-1-kasan-arm64 WARNING in ocfs2_unlink
2025/07/08 08:45 linux-6.1.y 04d1ccaa9c28 4f67c4ae .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-6-1-kasan-arm64 WARNING in ocfs2_unlink
2025/07/08 06:49 linux-6.1.y 04d1ccaa9c28 4f67c4ae .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-6-1-kasan-arm64 WARNING in ocfs2_unlink
2026/01/07 10:08 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in ocfs2_unlink
2025/12/31 02:30 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in ocfs2_unlink
2025/12/17 03:16 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in ocfs2_unlink
2025/09/15 04:23 linux-6.1.y 3db754f56897 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in ocfs2_unlink
2025/12/29 12:58 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in ocfs2_unlink
2025/12/17 14:12 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in ocfs2_unlink
2025/11/10 06:21 linux-6.1.y f6e38ae624cf 4e1406b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in ocfs2_unlink
2025/11/08 23:12 linux-6.1.y f6e38ae624cf 4e1406b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in ocfs2_unlink
2025/07/08 05:29 linux-6.1.y 04d1ccaa9c28 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in ocfs2_unlink
* Struck through repros no longer work on HEAD.