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WARNING in f2fs_fill_super

Status: upstream: reported C repro on 2026/06/19 12:10
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+4ed06283532ebfd44de7@syzkaller.appspotmail.com
First crash: 26d, last: 8m
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2026/06/21 linux-5.15.y (ToT) eceeec79dbc6 C [report] WARNING in f2fs_fill_super
2026/06/21 upstream (ToT) 390d73adf896 C Didn't crash

Sample crash report:
loop0: detected capacity change from 0 to 40427
F2FS-fs (loop0): build fault injection attr: rate: 25, type: 0x1ffff
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4352 at kernel/locking/lockdep.c:6325 lockdep_unregister_key+0x4d7/0x520 kernel/locking/lockdep.c:6334
Modules linked in:
CPU: 0 PID: 4352 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:lockdep_unregister_key+0x4d7/0x520 kernel/locking/lockdep.c:6325
Code: 80 00 00 00 75 39 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 f9 97 61 08 41 f7 c4 00 02 00 00 74 90 fb 84 db 75 8f eb a0 <0f> 0b e9 44 ff ff ff 0f 0b e9 b0 fe ff ff 0f 0b e9 fd fe ff ff e8
RSP: 0018:ffffc9000327f9c0 EFLAGS: 00010002
RAX: 0000000000000000 RBX: ffff88807b33d728 RCX: dffffc0000000000
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc9000327f940
RBP: ffffc9000327fa90 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200064ff28 R12: 0000000000000a07
R13: ffff88807b33c000 R14: 0000000000000000 R15: 1ffff9200064ff3c
FS:  0000555568436500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc778735000 CR3: 000000002a656000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 f2fs_fill_super+0x3ce4/0x7050 fs/f2fs/super.c:4536
 mount_bdev+0x28a/0x3c0 fs/super.c:1400
 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x247/0xa40 fs/namespace.c:3034
 do_mount fs/namespace.c:3377 [inline]
 __do_sys_mount fs/namespace.c:3585 [inline]
 __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3562
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f42d07a20ca
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff6c35a178 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fff6c35a200 RCX: 00007f42d07a20ca
RDX: 0000200000000000 RSI: 0000200000000040 RDI: 00007fff6c35a1c0
RBP: 0000200000000000 R08: 00007fff6c35a200 R09: 0000000000000008
R10: 0000000000000008 R11: 0000000000000246 R12: 0000200000000040
R13: 00007fff6c35a1c0 R14: 0000000000005517 R15: 0000200000000100
 </TASK>

Crashes (6591):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/07/07 10:03 linux-5.15.y c86c4726e7f0 8e71ce95 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/06/20 13:13 linux-5.15.y eceeec79dbc6 43bfcdb0 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/06/20 11:54 linux-5.15.y eceeec79dbc6 43bfcdb0 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/16 05:10 linux-5.15.y c86c4726e7f0 27a8bd60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/16 04:55 linux-5.15.y c86c4726e7f0 27a8bd60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/16 04:26 linux-5.15.y c86c4726e7f0 27a8bd60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/15 20:54 linux-5.15.y c86c4726e7f0 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/15 19:51 linux-5.15.y c86c4726e7f0 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/15 19:22 linux-5.15.y c86c4726e7f0 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/15 18:15 linux-5.15.y c86c4726e7f0 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/15 16:56 linux-5.15.y c86c4726e7f0 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/15 15:51 linux-5.15.y c86c4726e7f0 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/15 15:31 linux-5.15.y c86c4726e7f0 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/15 14:56 linux-5.15.y c86c4726e7f0 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/15 14:20 linux-5.15.y c86c4726e7f0 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/15 07:23 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/15 06:23 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/15 05:29 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/15 04:04 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/15 03:07 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/15 02:04 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/15 01:10 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/14 23:49 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/14 21:38 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/14 20:32 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/14 19:57 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/14 17:54 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/14 17:35 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/14 16:56 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/14 16:02 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/14 15:56 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/14 13:30 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/14 13:25 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/14 12:21 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/14 11:06 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/14 10:03 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/14 09:48 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/14 09:29 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/14 09:09 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/14 08:39 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/14 07:34 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/14 06:26 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/14 06:00 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/13 22:22 linux-5.15.y c86c4726e7f0 cc4833d0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/07/13 20:59 linux-5.15.y c86c4726e7f0 cc4833d0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
2026/06/19 12:10 linux-5.15.y eceeec79dbc6 570c59ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in f2fs_fill_super
* Struck through repros no longer work on HEAD.