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kernel BUG in ocfs2_reserve_suballoc_bits

Status: upstream: reported C repro on 2024/11/01 20:51
Subsystems: ocfs2
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+fd05de09d1267725aa95@syzkaller.appspotmail.com
First crash: 573d, last: 1d20h
▶ ▼ ✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
9c3ee2d7-0d11-473a-b6d5-6068a5947424 assessment-security DenialOfService: ✅ Exploitable: ✅ FilesystemTrigger: ✅ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ kernel BUG in ocfs2_reserve_suballoc_bits 2026/05/24 04:24 2026/05/24 04:24 2026/05/24 05:10 c69befb30ac10e158cc9d1557b508ee3f0eca1de
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [ocfs2?] kernel BUG in ocfs2_reserve_suballoc_bits 0 (4) 2025/10/22 15:05
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 kernel BUG in ocfs2_reserve_suballoc_bits -1 1 433d 433d 0/3 auto-obsoleted due to no activity on 2025/06/25 12:34
linux-6.1 kernel BUG in ocfs2_reserve_suballoc_bits (2) -1 C error 11 33d 258d 0/3 upstream: reported C repro on 2025/09/08 12:17
linux-5.15 kernel BUG in ocfs2_reserve_suballoc_bits -1 1 251d 251d 0/3 auto-obsoleted due to no activity on 2025/12/24 10:29
linux-5.15 kernel BUG in ocfs2_reserve_suballoc_bits (2) -1 1 147d 147d 0/3 auto-obsoleted due to no activity on 2026/04/08 06:32
▶ ▼ Last patch testing requests (7)
Created Duration User Patch Repo Result
2026/02/02 23:10 16m retest repro upstream error
2025/10/22 15:05 14m dmantipov@yandex.ru patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 552c50713f273b494ac6c77052032a49bc9255e2 report log
2025/09/03 16:05 21m retest repro upstream OK log
2025/07/21 09:14 15m retest repro upstream report log
2025/06/18 03:34 14m retest repro upstream report log
2025/04/09 03:16 14m retest repro upstream report log
2024/11/20 08:14 19m dmantipov@yandex.ru patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git bf9aa14fc523d2763fc9a10672a709224e8fcaf4 report log

Sample crash report:
------------[ cut here ]------------
kernel BUG at fs/ocfs2/suballoc.c:806!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5473 Comm: syz.0.16 Not tainted 6.16.0-rc4-syzkaller-00348-g772b78c2abd8 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:ocfs2_reserve_suballoc_bits+0x3f38/0x4640 fs/ocfs2/suballoc.c:806
Code: 78 e9 23 f2 ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 82 dd ff ff 4c 89 f7 e8 b3 e9 7d fe e9 75 dd ff ff e8 39 66 1a fe 90 <0f> 0b 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 3c df ff ff 4c 89 ff
RSP: 0018:ffffc900029fdca0 EFLAGS: 00010293
RAX: ffffffff83a5bfc7 RBX: ffff88804e5a9e00 RCX: ffff888031302440
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: ffffc900029fe170 R08: ffffffff8fa1e5f7 R09: 1ffffffff1f43cbe
R10: dffffc0000000000 R11: fffffbfff1f43cbf R12: 0000000000000000
R13: dffffc0000000000 R14: ffff888042d64fb8 R15: 00000000ffffffff
FS:  00007f1bd7d886c0(0000) GS:ffff88808d21d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1bd7d65fb8 CR3: 000000004f0a4000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ocfs2_reserve_cluster_bitmap_bits+0xc4/0x1c0 fs/ocfs2/suballoc.c:1134
 ocfs2_local_alloc_reserve_for_window fs/ocfs2/localalloc.c:1108 [inline]
 ocfs2_local_alloc_slide_window fs/ocfs2/localalloc.c:1244 [inline]
 ocfs2_reserve_local_alloc_bits+0x88f/0x24e0 fs/ocfs2/localalloc.c:669
 ocfs2_reserve_clusters_with_limit+0x1be/0xba0 fs/ocfs2/suballoc.c:1168
 ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1229 [inline]
 ocfs2_lock_allocators+0x2fa/0x5c0 fs/ocfs2/suballoc.c:2772
 ocfs2_write_begin_nolock+0x2279/0x4340 fs/ocfs2/aops.c:1718
 ocfs2_dio_wr_get_block+0xb6f/0x1770 fs/ocfs2/aops.c:2211
 get_more_blocks fs/direct-io.c:648 [inline]
 do_direct_IO fs/direct-io.c:936 [inline]
 __blockdev_direct_IO+0x16dd/0x33d0 fs/direct-io.c:1243
 ocfs2_direct_IO+0x25f/0x2d0 fs/ocfs2/aops.c:2438
 generic_file_direct_write+0x1d8/0x3e0 mm/filemap.c:4046
 __generic_file_write_iter+0x11d/0x230 mm/filemap.c:4215
 ocfs2_file_write_iter+0x157a/0x1d10 fs/ocfs2/file.c:2469
 iter_file_splice_write+0x937/0x1000 fs/splice.c:738
 do_splice_from fs/splice.c:935 [inline]
 direct_splice_actor+0x101/0x160 fs/splice.c:1158
 splice_direct_to_actor+0x5a5/0xcc0 fs/splice.c:1102
 do_splice_direct_actor fs/splice.c:1201 [inline]
 do_splice_direct+0x181/0x270 fs/splice.c:1227
 do_sendfile+0x4da/0x7e0 fs/read_write.c:1370
 __do_sys_sendfile64 fs/read_write.c:1431 [inline]
 __se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1417
 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: 0033:0x7f1bd6f8e929
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1bd7d88038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f1bd71b5fa0 RCX: 00007f1bd6f8e929
RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000008
RBP: 00007f1bd7010b39 R08: 0000000000000000 R09: 0000000000000000
R10: 000000080000000c R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1bd71b5fa0 R15: 00007fff8de43e08
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_reserve_suballoc_bits+0x3f38/0x4640 fs/ocfs2/suballoc.c:806
Code: 78 e9 23 f2 ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 82 dd ff ff 4c 89 f7 e8 b3 e9 7d fe e9 75 dd ff ff e8 39 66 1a fe 90 <0f> 0b 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 3c df ff ff 4c 89 ff
RSP: 0018:ffffc900029fdca0 EFLAGS: 00010293
RAX: ffffffff83a5bfc7 RBX: ffff88804e5a9e00 RCX: ffff888031302440
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: ffffc900029fe170 R08: ffffffff8fa1e5f7 R09: 1ffffffff1f43cbe
R10: dffffc0000000000 R11: fffffbfff1f43cbf R12: 0000000000000000
R13: dffffc0000000000 R14: ffff888042d64fb8 R15: 00000000ffffffff
FS:  00007f1bd7d886c0(0000) GS:ffff88808d21d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1bd7d65fb8 CR3: 000000004f0a4000 CR4: 0000000000352ef0

Crashes (440):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/07/07 09:10 upstream 772b78c2abd8 4f67c4ae .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro #1 (corrupt fs)] [mounted in repro #2 (clean fs)] [mounted in repro #3 (clean fs)] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/05/23 10:24 upstream cca95436be15 c69befb3 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/05/20 20:45 upstream df685633c3db 585486f8 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/05/19 19:05 upstream ab5fce87a778 2aa09d96 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/05/18 18:20 upstream 5200f5f493f7 143ffb88 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/05/17 16:02 upstream 6916d5703ddf de5aae85 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/05/17 13:04 upstream 6916d5703ddf de5aae85 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/05/17 04:48 upstream 6916d5703ddf de5aae85 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/05/16 14:20 upstream 6916d5703ddf a15a64a6 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/05/16 04:04 upstream d458a240344c 81fb92f3 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/05/12 14:36 upstream 50897c955902 07aeade5 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/05/11 21:31 upstream 5d6919055dec d168f260 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/05/06 11:32 upstream 74fe02ce122a 23ad3581 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/05/04 16:06 upstream 6d35786de281 85f1bcf2 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/05/04 14:11 upstream 6d35786de281 85f1bcf2 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/04/25 14:13 upstream 27d128c1cff6 9c2d0995 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/04/14 15:52 upstream d60bc1401583 362d1323 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/04/13 17:08 upstream 028ef9c96e96 9530ccf9 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/04/10 12:21 upstream 9a9c8ce300cd 38c8e246 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/04/07 10:11 upstream bfe62a454542 4440e7c2 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/04/06 06:02 upstream 1791c390149f 4440e7c2 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/04/02 17:01 upstream 9147566d8016 8b15d4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/03/27 08:10 upstream 46b513250491 50cdcaa1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/03/23 03:05 upstream 8d8bd2a5aa98 5b92003d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/03/21 05:04 upstream 42bddab0563f 5b92003d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/03/19 20:24 upstream e9825d1c7957 0291cd06 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/03/14 00:11 upstream 0257f64bdac7 351cb5cf .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/03/10 05:10 upstream 1f318b96cc84 6972f302 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/03/06 18:42 upstream 5ee8dbf54602 41d8037d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/03/02 19:34 upstream 11439c4635ed b9dd6534 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/03/01 16:11 upstream eb71ab2bf722 43249bac .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/02/17 23:34 upstream d295082ea672 f4288eed .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/02/09 13:00 upstream 05f7e89ab973 df949cd9 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/02/08 12:07 upstream e7aa57247700 4c131dc4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/01/19 21:39 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/01/19 11:39 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/01/19 07:10 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/01/19 04:30 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/01/18 16:36 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/01/18 14:58 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/01/16 19:34 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/01/15 04:35 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/01/14 05:20 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/01/14 01:32 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/01/13 12:38 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/01/11 13:28 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/01/11 04:31 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/01/10 17:37 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/01/10 11:03 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/01/08 10:53 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2026/01/04 15:51 upstream aacb0a6d604a d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2024/11/06 23:11 upstream 7758b206117d 7b852900 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
2024/10/28 20:41 upstream 819837584309 9efb3cc7 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_reserve_suballoc_bits
* Struck through repros no longer work on HEAD.