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kernel BUG in ocfs2_move_extents

Status: upstream: reported C repro on 2025/12/18 15:15
Subsystems: ocfs2
[Documentation on labels]
Reported-by: syzbot+7960178e777909060224@syzkaller.appspotmail.com
Fix commit: ocfs2: add check for free bits before allocation in ocfs2_move_extent()
Patched on: [ci-upstream-linux-next-kasan-gce-root ci-upstream-rust-kasan-gce], missing on: [ci-qemu-gce-upstream-auto ci-qemu-native-arm64-kvm ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb]
First crash: 48d, last: 2h36m
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
[PATCH v2] ocfs2: add check for free bits before allocation in ocfs2_move_extent() 2 (2) 2026/01/06 04:24
[syzbot] [ocfs2?] kernel BUG in ocfs2_move_extents 0 (7) 2026/01/04 12:26
[PATCH] ocfs2: add check for free bits before allocation in ocfs2_move_extent() 2 (2) 2026/01/04 01:50
▶ ▼ Last patch testing requests (5)
Created Duration User Patch Repo Result
2026/01/04 12:26 23m kartikey406@gmail.com patch upstream error
2026/01/04 11:49 23m kartikey406@gmail.com patch upstream error
2025/12/31 07:52 1h00m kartikey406@gmail.com patch upstream OK log
2025/12/31 07:51 2h32m kartikey406@gmail.com patch linux-next OK log
2025/12/31 05:05 29m kartikey406@gmail.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master OK log

Sample crash report:
=======================================================
JBD2: Ignoring recovery information on journal
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
------------[ cut here ]------------
kernel BUG at fs/ocfs2/suballoc.c:1383!
Internal error: Oops - BUG: 00000000f2000800 [#1]  SMP
Modules linked in:
CPU: 1 UID: 0 PID: 6734 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : ocfs2_block_group_set_bits+0x784/0x8ec fs/ocfs2/suballoc.c:1383
lr : ocfs2_block_group_set_bits+0x784/0x8ec fs/ocfs2/suballoc.c:1383
sp : ffff8000a3eb7260
x29: ffff8000a3eb7320 x28: ffff0000f60124f8 x27: ffff0000ca05c000
x26: ffff0000eaee1b00 x25: ffff0000c5c8c000 x24: 1ffff000147d6e58
x23: ffff0000c5c8c00c x22: dfff800000000000 x21: 0000000000000001
x20: 0000000000000002 x19: 0000000000000000 x18: 00000000ffffffff
x17: ffff800082225fb0 x16: ffff80008af67980 x15: 0000000000000001
x14: 0000000000000000 x13: 00000000fffffffc x12: 0000000000000000
x11: 0000000000000000 x10: 0000000000ff0100 x9 : 0000000000000000
x8 : ffff0000c8f1d580 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000002 x4 : 0000000000000001 x3 : ffff0000c1707d98
x2 : ffff0000c5c8c000 x1 : 0000000000000001 x0 : 0000000000000002
Call trace:
 ocfs2_block_group_set_bits+0x784/0x8ec fs/ocfs2/suballoc.c:1383 (P)
 ocfs2_move_extent fs/ocfs2/move_extents.c:693 [inline]
 __ocfs2_move_extents_range fs/ocfs2/move_extents.c:865 [inline]
 ocfs2_move_extents+0x213c/0x2e78 fs/ocfs2/move_extents.c:937
 ocfs2_ioctl_move_extents+0x448/0x614 fs/ocfs2/move_extents.c:1069
 ocfs2_ioctl+0x1c4/0x738 fs/ocfs2/ioctl.c:942
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:583
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
Code: 17ffffa0 97944b2d d4210000 97944b2b (d4210000) 
---[ end trace 0000000000000000 ]---

Crashes (120):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/23 20:30 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8f0b4cce4481 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci-upstream-gce-arm64 kernel BUG in ocfs2_move_extents
2026/02/01 04:21 upstream 162b42445b58 6b8752f2 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/31 15:57 upstream ad9a728a3388 afc0c4d4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/31 14:34 upstream ad9a728a3388 afc0c4d4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/30 06:35 upstream 4d310797262f bfa73b7b .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/30 04:23 upstream 4d310797262f bfa73b7b .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/29 19:58 upstream 8dfce8991b95 aeb6fdd5 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/29 17:58 upstream 8dfce8991b95 aeb6fdd5 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/29 13:29 upstream 8dfce8991b95 aeb6fdd5 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/29 09:28 upstream 8dfce8991b95 0adc945e .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/29 07:58 upstream 8dfce8991b95 0adc945e .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/29 03:25 upstream 8dfce8991b95 0adc945e .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/29 00:46 upstream 8dfce8991b95 0adc945e .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/28 16:37 upstream 1f97d9dcf536 004c195c .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/28 02:03 upstream 1f97d9dcf536 3029c699 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/27 08:30 upstream fcb70a56f4d8 efb3e894 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/26 19:00 upstream 63804fed149a 55756628 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/26 13:15 upstream 63804fed149a 55756628 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/26 07:50 upstream 023777797472 02bac031 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/26 04:26 upstream 023777797472 02bac031 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/25 04:00 upstream 5dbeeb268b63 40acda8a .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/24 07:16 upstream c133687c2eae 4f25b9b4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/24 02:31 upstream c133687c2eae 4f25b9b4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/23 18:25 upstream c072629f05d7 319d7797 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/23 15:45 upstream c072629f05d7 319d7797 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/23 11:48 upstream c072629f05d7 319d7797 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/23 08:35 upstream c072629f05d7 82c9c083 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/23 02:54 upstream a66191c590b3 82c9c083 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/22 08:49 upstream cf38b2340c0e 8fc37797 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/22 03:08 upstream cf38b2340c0e 8fc37797 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/21 17:12 upstream 6c790212c588 6f1aa2f9 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/21 15:06 upstream 6c790212c588 6f1aa2f9 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/21 05:07 upstream c03e9c42ae8f 2494e18d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/21 04:05 upstream c03e9c42ae8f 2494e18d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/20 18:29 upstream 24d479d26b25 572effc1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/19 20:08 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/19 10:36 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/19 08:11 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/19 06:18 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/18 23:45 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/17 21:20 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/17 12:19 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/17 09:43 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/16 23:33 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/16 01:03 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/15 16:52 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/15 14:20 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/15 11:26 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/15 02:01 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/14 22:37 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/13 20:06 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2026/01/13 18:14 upstream 54e82e93ca93 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2025/12/18 11:12 upstream ea1013c15392 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2025/12/14 15:05 upstream 8f0b4cce4481 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in ocfs2_move_extents
2025/12/31 23:39 linux-next cc3aa43b44bd d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root kernel BUG in ocfs2_move_extents
2026/01/12 21:45 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 59e4d31a0470 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in ocfs2_move_extents
* Struck through repros no longer work on HEAD.