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kernel BUG in ocfs2_claim_suballoc_bits

Status: upstream: reported C repro on 2024/08/22 08:11
Subsystems: ocfs2
[Documentation on labels]
Reported-by: syzbot+96d38c6e1655c1420a72@syzkaller.appspotmail.com
First crash: 456d, last: 14h05m
Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: kernel BUG in ocfs2_claim_suballoc_bits (log)
Repro: C syz .config
  
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [ocfs2?] kernel BUG in ocfs2_claim_suballoc_bits 0 (1) 2024/08/22 08:11
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 kernel BUG in ocfs2_claim_suballoc_bits origin:upstream -1 C 25 9d02h 353d 0/3 upstream: reported C repro on 2024/12/02 23:45
linux-5.15 kernel BUG in ocfs2_claim_suballoc_bits origin:upstream -1 C 31 23d 388d 0/3 upstream: reported C repro on 2024/10/28 07:17
linux-6.6 kernel BUG in ocfs2_claim_suballoc_bits origin:lts-only -1 C 3 11d 11d 0/2 upstream: reported C repro on 2025/11/09 13:08

Sample crash report:
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
------------[ cut here ]------------
kernel BUG at fs/ocfs2/suballoc.c:1443!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 5826 Comm: syz-executor183 Not tainted 6.15.0-syzkaller-13804-g939f15e640f1 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:ocfs2_find_victim_chain fs/ocfs2/suballoc.c:1443 [inline]
RIP: 0010:ocfs2_claim_suballoc_bits+0x243c/0x2450 fs/ocfs2/suballoc.c:1996
Code: c2 fb ff ff e8 85 42 1c fe 90 0f 0b e8 7d 42 1c fe 90 0f 0b e8 75 42 1c fe 90 0f 0b e8 6d 42 1c fe 90 0f 0b e8 65 42 1c fe 90 <0f> 0b e8 5d 42 1c fe 90 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90
RSP: 0018:ffffc900042dee80 EFLAGS: 00010293
RAX: ffffffff83a40b8b RBX: 0000000000000000 RCX: ffff88802ca45a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900042df110 R08: ffffc900042df1a0 R09: 0000000000000003
R10: 0000000000000005 R11: 0000000000000000 R12: ffff888142af0e08
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff1102855e1c1
FS:  000055558e0f1380(0000) GS:ffff888125d86000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f12c1b8dd30 CR3: 0000000034df2000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __ocfs2_claim_clusters+0x303/0x8f0 fs/ocfs2/suballoc.c:2421
 ocfs2_local_alloc_new_window fs/ocfs2/localalloc.c:1166 [inline]
 ocfs2_local_alloc_slide_window fs/ocfs2/localalloc.c:1295 [inline]
 ocfs2_reserve_local_alloc_bits+0x12be/0x24e0 fs/ocfs2/localalloc.c:669
 ocfs2_reserve_clusters_with_limit+0x1be/0xba0 fs/ocfs2/suballoc.c:1168
 ocfs2_mknod+0xe32/0x2050 fs/ocfs2/namei.c:354
 ocfs2_mkdir+0x191/0x440 fs/ocfs2/namei.c:656
 vfs_mkdir+0x306/0x510 fs/namei.c:4366
 do_mkdirat+0x247/0x590 fs/namei.c:4399
 __do_sys_mkdirat fs/namei.c:4416 [inline]
 __se_sys_mkdirat fs/namei.c:4414 [inline]
 __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4414
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcd324a4a99
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd36fcc358 EFLAGS: 00000206 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007fcd324a4a99
RDX: 0000000000000081 RSI: 0000200000000000 RDI: 00000000ffffff9c
RBP: 00007fcd3251c5f0 R08: 0000000000004446 R09: 000055558e0f24c0
R10: 00007ffd36fcc220 R11: 0000000000000206 R12: 00007ffd36fcc380
R13: 00007ffd36fcc5a8 R14: 431bde82d7b634db R15: 00007fcd324ed03b
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_find_victim_chain fs/ocfs2/suballoc.c:1443 [inline]
RIP: 0010:ocfs2_claim_suballoc_bits+0x243c/0x2450 fs/ocfs2/suballoc.c:1996
Code: c2 fb ff ff e8 85 42 1c fe 90 0f 0b e8 7d 42 1c fe 90 0f 0b e8 75 42 1c fe 90 0f 0b e8 6d 42 1c fe 90 0f 0b e8 65 42 1c fe 90 <0f> 0b e8 5d 42 1c fe 90 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90
RSP: 0018:ffffc900042dee80 EFLAGS: 00010293
RAX: ffffffff83a40b8b RBX: 0000000000000000 RCX: ffff88802ca45a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900042df110 R08: ffffc900042df1a0 R09: 0000000000000003
R10: 0000000000000005 R11: 0000000000000000 R12: ffff888142af0e08
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff1102855e1c1
FS:  000055558e0f1380(0000) GS:ffff888125d86000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f12c1b8dd30 CR3: 0000000034df2000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (1664):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/06/08 22:27 upstream 939f15e640f1 4826c28e .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-upstream-fs kernel BUG in ocfs2_claim_suballoc_bits
2025/05/24 19:38 upstream b1427432d3b6 ed351ea7 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-upstream-fs kernel BUG in ocfs2_claim_suballoc_bits
2025/02/08 20:05 upstream 8f6629c004b1 ef44b750 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-upstream-fs kernel BUG in ocfs2_claim_suballoc_bits
2024/11/12 02:12 upstream 2d5404caa8c7 75bb1b32 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs kernel BUG in ocfs2_claim_suballoc_bits
2025/10/18 07:19 upstream 6f3b6e91f720 1c8c8cd8 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/06/08 17:50 upstream 8630c59e9936 4826c28e .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/05/24 18:15 upstream 4856ebd99715 ed351ea7 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/02/13 16:13 upstream 4dc1d1bec898 7320a65f .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2024/08/22 10:21 upstream 872cf28b8df9 ca02180f .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2024/08/22 08:45 upstream 872cf28b8df9 ca02180f .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2024/08/22 06:26 upstream 872cf28b8df9 ca02180f .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/10/16 03:40 linux-next 1fdbb3ff1233 19568248 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci-upstream-linux-next-kasan-gce-root kernel BUG in ocfs2_claim_suballoc_bits
2025/06/04 02:00 linux-next a0bea9e39035 a30356b7 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci-upstream-linux-next-kasan-gce-root kernel BUG in ocfs2_claim_suballoc_bits
2025/10/25 18:50 upstream 566771afc7a8 c0460fcd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root kernel BUG in ocfs2_claim_suballoc_bits
2025/09/18 11:34 upstream 8b789f2b7602 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in ocfs2_claim_suballoc_bits
2025/11/20 15:53 upstream 23cb64fb7625 2cc4c24a .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/20 07:42 upstream 23cb64fb7625 26ee5237 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/19 16:20 upstream 8b690556d8fe 82d7b894 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/18 05:28 upstream e7c375b18160 ef766cd7 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/17 19:45 upstream 6a23ae0a96a6 c1ade9dd .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/17 17:30 upstream 6a23ae0a96a6 c1ade9dd .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/17 12:23 upstream 6a23ae0a96a6 c1ade9dd .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/16 23:52 upstream 7254a2b52279 f7988ea4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/16 20:52 upstream 7254a2b52279 f7988ea4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/16 06:38 upstream f824272b6e3f f7988ea4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/15 23:09 upstream f824272b6e3f f7988ea4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/15 16:08 upstream 7a0892d2836e f7988ea4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/15 14:53 upstream 7a0892d2836e f7988ea4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/15 12:35 upstream 7a0892d2836e f7988ea4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/14 16:22 upstream 6da43bbeb691 6d98c1c8 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/14 02:38 upstream 2ccec5944606 07e030de .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/14 00:10 upstream 2ccec5944606 07e030de .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/13 23:00 upstream 2ccec5944606 07e030de .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/13 20:55 upstream 2ccec5944606 07e030de .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/13 13:32 upstream e927c520e1ba 07e030de .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/13 11:00 upstream e927c520e1ba 07e030de .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/13 00:34 upstream 24172e0d7990 07e030de .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/12 16:04 upstream 24172e0d7990 07e030de .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/11 12:19 upstream 4427259cc7f7 4e1406b4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/11 10:46 upstream 4427259cc7f7 4e1406b4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/11 06:43 upstream 4ea7c1717f3f 4e1406b4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/11 05:20 upstream 4ea7c1717f3f 4e1406b4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/11 03:33 upstream 4ea7c1717f3f 4e1406b4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/10 12:49 upstream e9a6fb0bcdd7 4e1406b4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/09 22:21 upstream 439fc29dfd3b 4e1406b4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/09 03:20 upstream 7bb4d6512545 4e1406b4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/08 17:34 upstream e811c33b1f13 4e1406b4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/08 14:05 upstream e811c33b1f13 4e1406b4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/08 06:36 upstream da32d155f4a8 4e1406b4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/08 00:19 upstream da32d155f4a8 4e1406b4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/07 01:00 upstream c2c2ccfd4ba7 4e1406b4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/06 14:55 upstream dc77806cf3b4 a6c9c731 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/06 12:57 upstream dc77806cf3b4 a6c9c731 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/06 04:28 upstream dc77806cf3b4 a6c9c731 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/05 16:27 upstream 284922f4c563 a6c9c731 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/04 18:23 upstream c9cfc122f037 686bf657 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/04 09:42 upstream 8bb886cb8f3a 686bf657 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/04 07:22 upstream 8bb886cb8f3a 686bf657 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/04 04:19 upstream 8bb886cb8f3a 686bf657 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/03 21:57 upstream 6146a0f1dfae e6c64ba8 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_claim_suballoc_bits
2025/10/25 13:14 linux-next 72fb0170ef1f c0460fcd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root kernel BUG in ocfs2_claim_suballoc_bits
2025/11/15 06:35 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci db9030a787e3 f7988ea4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in ocfs2_claim_suballoc_bits
* Struck through repros no longer work on HEAD.