kernel BUG in ocfs2_write_block

Status: upstream: reported C repro on 2024/10/28 08:07
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+609ea64bc76a4623cbda@syzkaller.appspotmail.com
First crash: 726d, last: 15d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2024/11/08 upstream (ToT) 906bd684e4b1 C [report] kernel BUG in ocfs2_write_block
2026/09/29 upstream (ToT) [unknown] C Failed due to an error; will retry later
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel BUG in ocfs2_write_block ocfs2 -1 syz, C inconclusive 29 291d 765d 29/29 fixed on 2026/05/06 16:40
linux-5.15 kernel BUG in ocfs2_write_block origin:lts-only -1 syz, C error 9 9d22h 693d 0/3 upstream: reported C repro on 2024/11/29 21:33
▶ ▼ Fix bisection attempts (3)
Created Duration User Patch Repo Result
2025/03/04 08:58 14m bisect fix linux-6.1.y error job log
2025/01/30 13:57 1h35m bisect fix linux-6.1.y OK (0) job log log
2024/12/13 18:22 1h47m bisect fix linux-6.1.y OK (0) job log log

Sample crash report:
         and is ignored by this kernel. Remove the mand
         option from the mount to silence this warning.
=======================================================
------------[ cut here ]------------
kernel BUG at fs/ocfs2/buffer_head_io.c:45!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 4491 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : ocfs2_write_block+0x620/0x728 fs/ocfs2/buffer_head_io.c:45
lr : ocfs2_write_block+0x620/0x728 fs/ocfs2/buffer_head_io.c:45
sp : ffff800022006c40
x29: ffff800022006ce0 x28: 1fffe0001c0f9aeb x27: ffff0000e07cd758
x26: dfff800000000000 x25: ffff800022006c60 x24: ffff700004400d8c
x23: ffff80001641d160 x22: 0000000000000000 x21: ffff0000e110c000
x20: ffff0000e07cd740 x19: ffff0000e561b2f0 x18: 1fffe00033c1c97e
x17: ffff80001641d000 x16: ffff800011bcac18 x15: 0000000000000000
x14: 0000000000000001 x13: 1fffe0001c221820 x12: 0000000000000000
x11: ff00800009dab7dc x10: 0000000000000000 x9 : ffff800009dab7dc
x8 : ffff0000df189c00 x7 : ffff800009e6cd74 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff8000082f4a98
x2 : ffff0000e561b2f0 x1 : 0000000000000000 x0 : 0000000000000002
Call trace:
 ocfs2_write_block+0x620/0x728 fs/ocfs2/buffer_head_io.c:45
 ocfs2_update_disk_slot+0x3e0/0x5c4 fs/ocfs2/slot_map.c:197
 ocfs2_find_slot+0x410/0x9d8 fs/ocfs2/slot_map.c:482
 ocfs2_mount_volume+0x168/0x126c fs/ocfs2/super.c:1806
 ocfs2_fill_super+0x2d70/0x417c fs/ocfs2/super.c:1082
 mount_bdev+0x264/0x35c fs/super.c:1454
 ocfs2_mount+0x44/0x58 fs/ocfs2/super.c:1186
 legacy_get_tree+0xd8/0x174 fs/fs_context.c:632
 vfs_get_tree+0x90/0x278 fs/super.c:1584
 do_new_mount+0x228/0x804 fs/namespace.c:3078
 path_mount+0x5ac/0xe6c fs/namespace.c:3408
 do_mount fs/namespace.c:3421 [inline]
 __do_sys_mount fs/namespace.c:3629 [inline]
 __se_sys_mount fs/namespace.c:3606 [inline]
 __arm64_sys_mount+0x4a0/0x5a0 fs/namespace.c:3606
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x12c 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
Code: b4000896 979c24d7 17fffea7 979c24d5 (d4210000) 
---[ end trace 0000000000000000 ]---

Crashes (18):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/09 06:52 linux-6.1.y a500ba24937a b2734a59 .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_write_block
2026/07/22 18:58 linux-6.1.y 090666d3cc90 4a865b71 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_write_block
2026/05/09 16:55 linux-6.1.y 128a674368bf 29233ece .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_write_block
2026/04/19 05:10 linux-6.1.y 7c87defbd336 303e2802 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_write_block
2025/07/19 16:10 linux-6.1.y 3369c6df2fae 7117feec .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_write_block
2024/10/28 08:19 linux-6.1.y 7ec6f9fa3d97 65e8686b .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_write_block
2026/06/01 08:00 linux-6.1.y dcbcab9d7079 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_write_block
2026/05/10 00:45 linux-6.1.y 128a674368bf 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_write_block
2026/04/26 22:24 linux-6.1.y 7c87defbd336 9c2d0995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_write_block
2026/04/19 04:56 linux-6.1.y 7c87defbd336 303e2802 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_write_block
2025/10/11 19:01 linux-6.1.y 882efbdd9d34 ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_write_block
2025/10/11 16:48 linux-6.1.y 882efbdd9d34 ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_write_block
2025/09/08 22:52 linux-6.1.y 28c695c365e1 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_write_block
2025/09/06 19:23 linux-6.1.y 28c695c365e1 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_write_block
2025/08/13 18:57 linux-6.1.y 3594f306da12 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_write_block
2025/07/19 15:56 linux-6.1.y 3369c6df2fae 7117feec .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_write_block
2024/12/26 06:19 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_write_block
2024/10/28 08:07 linux-6.1.y 7ec6f9fa3d97 65e8686b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ocfs2_write_block
* Struck through repros no longer work on HEAD.