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kernel BUG in ocfs2_claim_suballoc_bits

Status: upstream: reported C repro on 2024/12/02 23:45
Reported-by: syzbot+9a1fb0bfb3697af3a16d@syzkaller.appspotmail.com
First crash: 421d, last: 21d
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2026/01/12 upstream (ToT) 7143203341dc C Didn't crash
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel BUG in ocfs2_claim_suballoc_bits ocfs2 -1 C inconclusive 1706 44d 524d 29/29 fixed on 2026/01/07 12:29
linux-5.15 kernel BUG in ocfs2_claim_suballoc_bits origin:upstream -1 C 33 17d 457d 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 inconclusive 7 33d 79d 0/2 upstream: reported C repro on 2025/11/09 13:08
▶ ▼ Fix bisection attempts (6)
Created Duration User Patch Repo Result
2025/09/27 21:56 1h40m bisect fix linux-6.1.y OK (0) job log log
2025/08/17 11:46 1h56m bisect fix linux-6.1.y OK (0) job log log
2025/07/18 06:02 1h23m bisect fix linux-6.1.y OK (0) job log log
2025/06/16 18:32 1h49m bisect fix linux-6.1.y OK (0) job log log
2025/05/14 21:15 3h00m bisect fix linux-6.1.y OK (0) job log log
2025/04/12 01:30 2h22m bisect fix linux-6.1.y OK (0) job log log

Sample crash report:
ocfs2: Mounting device (7,1) on (node local, slot 0) with ordered data mode.
------------[ cut here ]------------
kernel BUG at fs/ocfs2/suballoc.c:1387!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8445 Comm: syz.1.759 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:ocfs2_find_victim_chain fs/ocfs2/suballoc.c:1387 [inline]
RIP: 0010:ocfs2_claim_suballoc_bits+0x2153/0x22d0 fs/ocfs2/suballoc.c:1927
Code: c3 9d 8a fe e9 66 fb ff ff e8 09 6c 3a fe 0f 0b e8 02 6c 3a fe 0f 0b e8 fb 6b 3a fe 0f 0b e8 f4 6b 3a fe 0f 0b e8 ed 6b 3a fe <0f> 0b e8 e6 6b 3a fe 0f 0b 4d 89 f4 65 44 8b 35 a9 a5 bb 7c 48 c7
RSP: 0018:ffffc90003b16920 EFLAGS: 00010287
RAX: ffffffff834673e3 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc90005dc9000 RSI: 00000000000026b1 RDI: 00000000000026b2
RBP: ffffc90003b16bb0 R08: ffffc90003b16c40 R09: ffffc90003b16c40
R10: fffff52000762d8c R11: 1ffff92000762d88 R12: ffff888042670400
R13: ffff8880291b6788 R14: 0000000000000002 R15: dffffc0000000000
FS:  00007fd4d7f3e6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff75939d000 CR3: 0000000077bf4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ocfs2_claim_new_inode+0x326/0x780 fs/ocfs2/suballoc.c:2210
 ocfs2_mknod_locked+0xfd/0x240 fs/ocfs2/namei.c:635
 ocfs2_mknod+0x1097/0x2350 fs/ocfs2/namei.c:381
 ocfs2_create+0x1b6/0x4a0 fs/ocfs2/namei.c:674
 lookup_open fs/namei.c:3490 [inline]
 open_last_lookups fs/namei.c:3558 [inline]
 path_openat+0x1187/0x2e70 fs/namei.c:3788
 do_filp_open+0x1c1/0x3c0 fs/namei.c:3818
 file_open_name fs/open.c:1265 [inline]
 filp_open+0x173/0x1d0 fs/open.c:1285
 do_coredump+0x1ad7/0x22b0 fs/coredump.c:765
 get_signal+0x10aa/0x1350 kernel/signal.c:2857
 arch_do_signal_or_restart+0xb7/0x1240 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd4d704f6b0
Code: 48 c1 e8 12 83 e0 01 88 15 42 60 ec 00 88 05 3f 60 ec 00 c3 50 48 8d 35 e9 48 1c 00 48 8d 3d ef 48 1c 00 31 c0 e8 20 f7 ff ff <53> 89 fb 48 83 ec 10 64 8b 04 25 94 ff ff ff 85 c0 74 2a 89 fe 31
RSP: 002b:00007fd4d7f3db38 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 00007fd4d73e5fa8 RCX: 00007fd4d718f749
RDX: 00007fd4d7f3db40 RSI: 00007fd4d7f3dc70 RDI: 000000000000000b
RBP: 00007fd4d73e5fa0 R08: 002e8be60e7f7d3a R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd4d73e6038 R14: 00007ffebb8c7860 R15: 00007ffebb8c7948
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_find_victim_chain fs/ocfs2/suballoc.c:1387 [inline]
RIP: 0010:ocfs2_claim_suballoc_bits+0x2153/0x22d0 fs/ocfs2/suballoc.c:1927
Code: c3 9d 8a fe e9 66 fb ff ff e8 09 6c 3a fe 0f 0b e8 02 6c 3a fe 0f 0b e8 fb 6b 3a fe 0f 0b e8 f4 6b 3a fe 0f 0b e8 ed 6b 3a fe <0f> 0b e8 e6 6b 3a fe 0f 0b 4d 89 f4 65 44 8b 35 a9 a5 bb 7c 48 c7
RSP: 0018:ffffc90003b16920 EFLAGS: 00010287
RAX: ffffffff834673e3 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc90005dc9000 RSI: 00000000000026b1 RDI: 00000000000026b2
RBP: ffffc90003b16bb0 R08: ffffc90003b16c40 R09: ffffc90003b16c40
R10: fffff52000762d8c R11: 1ffff92000762d88 R12: ffff888042670400
R13: ffff8880291b6788 R14: 0000000000000002 R15: dffffc0000000000
FS:  00007fd4d7f3e6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffde000000 CR3: 0000000077bf4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (36):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/28 12:50 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ocfs2_claim_suballoc_bits
2025/12/26 05:52 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ocfs2_claim_suballoc_bits
2025/12/26 05:50 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ocfs2_claim_suballoc_bits
2025/12/20 23:08 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ocfs2_claim_suballoc_bits
2025/12/20 23:08 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ocfs2_claim_suballoc_bits
2025/11/12 03:11 linux-6.1.y f6e38ae624cf 4e1406b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ocfs2_claim_suballoc_bits
2025/03/08 06:39 linux-6.1.y 6ae7ac5c4251 7e3bd60d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ocfs2_claim_suballoc_bits
2025/02/27 06:18 linux-6.1.y 3a8358583626 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ocfs2_claim_suballoc_bits
2025/02/21 02:32 linux-6.1.y 0cbb5f65e52f 0808a665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ocfs2_claim_suballoc_bits
2025/02/21 02:32 linux-6.1.y 0cbb5f65e52f 0808a665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ocfs2_claim_suballoc_bits
2024/12/08 20:48 linux-6.1.y e4d90d63d385 9ac0fdc6 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan kernel BUG in ocfs2_claim_suballoc_bits
2024/12/08 19:56 linux-6.1.y e4d90d63d385 9ac0fdc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ocfs2_claim_suballoc_bits
2026/01/06 09:15 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
2025/12/31 19:57 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
2025/12/26 04:18 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
2025/12/26 04:17 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
2025/12/03 21:10 linux-6.1.y f6e38ae624cf d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
2025/12/03 20:20 linux-6.1.y f6e38ae624cf d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
2025/10/27 01:55 linux-6.1.y 8e6e2188d949 c0460fcd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
2025/10/14 06:01 linux-6.1.y 882efbdd9d34 b6605ba8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
2025/08/23 14:15 linux-6.1.y 0bc96de781b4 bf27483f .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
2025/08/23 13:52 linux-6.1.y 0bc96de781b4 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
2025/03/08 03:25 linux-6.1.y 6ae7ac5c4251 7e3bd60d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
2025/03/08 03:25 linux-6.1.y 6ae7ac5c4251 7e3bd60d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
2025/02/27 05:34 linux-6.1.y 3a8358583626 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
2025/02/27 05:32 linux-6.1.y 3a8358583626 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
2025/02/25 19:44 linux-6.1.y 3a8358583626 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
2025/02/21 04:37 linux-6.1.y 0cbb5f65e52f 0808a665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
2025/02/21 01:10 linux-6.1.y 0cbb5f65e52f 0808a665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
2025/02/21 01:10 linux-6.1.y 0cbb5f65e52f 0808a665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
2025/02/04 11:42 linux-6.1.y 0cbb5f65e52f 8f267cef .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
2025/02/04 11:41 linux-6.1.y 0cbb5f65e52f 8f267cef .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
2025/01/26 00:00 linux-6.1.y 75cefdf153f5 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
2025/01/25 23:57 linux-6.1.y 75cefdf153f5 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
2024/12/25 10:14 linux-6.1.y 29f02ec58a94 444551c4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
2024/12/02 23:44 linux-6.1.y e4d90d63d385 b499ea68 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_claim_suballoc_bits
* Struck through repros no longer work on HEAD.