[syzbot] [ocfs2?] kernel BUG in ocfs2_move_extents

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: ea1013c15392 Merge tag 'bpf-fixes' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=179abdc2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=513255d80ab78f2b
dashboard link: https://syzkaller.appspot.com/bug?extid=7960178e777909060224
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-ea1013c1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ea4d0b50128d/vmlinux-ea1013c1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f2e7f1524121/bzImage-ea1013c1.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+796017...@syzkaller.appspotmail.com

loop0: detected capacity change from 0 to 32768
=======================================================
WARNING: The mand mount option has been deprecated and
and is ignored by this kernel. Remove the mand
option from the mount to silence this warning.
=======================================================
JBD2: Ignoring recovery information on journal
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
(syz.0.0,5341,0):ocfs2_dio_end_io:2401 ERROR: Direct IO failed, bytes = -28
------------[ cut here ]------------
kernel BUG at fs/ocfs2/suballoc.c:1383!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5341 Comm: syz.0.0 Not tainted syzkaller #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_block_group_set_bits+0x857/0x980 fs/ocfs2/suballoc.c:1383
Code: 07 fe c1 38 c1 0f 8c b8 fe ff ff 4c 89 e7 89 f3 e8 ce ae 76 fe 89 de e9 a7 fe ff ff e8 82 c7 0e fe 90 0f 0b e8 7a c7 0e fe 90 <0f> 0b f3 0f 1e fa 65 8b 1d b0 65 ec 0e bf 07 00 00 00 89 de e8 a0
RSP: 0018:ffffc9000ec973e0 EFLAGS: 00010246
RAX: ffffffff83b2fa76 RBX: 0000000000000001 RCX: 0000000000100000
RDX: ffffc90020802000 RSI: 00000000000fffff RDI: 0000000000100000
RBP: ffffc9000ec97500 R08: 0000000000000007 R09: 00000000000000f8
R10: 00000000fffffffc R11: 0000000000000002 R12: 1ffff1100253aa01
R13: 00000000000000f8 R14: ffff8880478e4fb8 R15: dffffc0000000000
FS: 00007f460e7df6c0(0000) GS:ffff88808d22a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f46027ff000 CR3: 0000000011427000 CR4: 0000000000352ef0
Call Trace:
<TASK>
ocfs2_move_extent fs/ocfs2/move_extents.c:693 [inline]
__ocfs2_move_extents_range fs/ocfs2/move_extents.c:865 [inline]
ocfs2_move_extents+0x2c39/0x3dd0 fs/ocfs2/move_extents.c:937
ocfs2_ioctl_move_extents+0x568/0x740 fs/ocfs2/move_extents.c:1069
ocfs2_ioctl+0x191/0x750 fs/ocfs2/ioctl.c:942
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f460d98f7c9
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:00007f460e7df038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f460dbe5fa0 RCX: 00007f460d98f7c9
RDX: 00002000000000c0 RSI: 0000000040406f06 RDI: 0000000000000004
RBP: 00007f460da13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f460dbe6038 R14: 00007f460dbe5fa0 R15: 00007fff6d300b38
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_block_group_set_bits+0x857/0x980 fs/ocfs2/suballoc.c:1383
Code: 07 fe c1 38 c1 0f 8c b8 fe ff ff 4c 89 e7 89 f3 e8 ce ae 76 fe 89 de e9 a7 fe ff ff e8 82 c7 0e fe 90 0f 0b e8 7a c7 0e fe 90 <0f> 0b f3 0f 1e fa 65 8b 1d b0 65 ec 0e bf 07 00 00 00 89 de e8 a0
RSP: 0018:ffffc9000ec973e0 EFLAGS: 00010246
RAX: ffffffff83b2fa76 RBX: 0000000000000001 RCX: 0000000000100000
RDX: ffffc90020802000 RSI: 00000000000fffff RDI: 0000000000100000
RBP: ffffc9000ec97500 R08: 0000000000000007 R09: 00000000000000f8
R10: 00000000fffffffc R11: 0000000000000002 R12: 1ffff1100253aa01
R13: 00000000000000f8 R14: ffff8880478e4fb8 R15: dffffc0000000000
FS: 00007f460e7df6c0(0000) GS:ffff88808d22a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f46027ff000 CR3: 0000000011427000 CR4: 0000000000352ef0


---
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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 8f0b4cce4481 Linux 6.19-rc1
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=12eb8bb4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=8a8594efdc14f07a

dashboard link: https://syzkaller.appspot.com/bug?extid=7960178e777909060224
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

userspace arch: arm64
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14838f1a580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16eb8bb4580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/cd4f5f43efc8/disk-8f0b4cce.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/aafb35ac3a3c/vmlinux-8f0b4cce.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d221fae4ab17/Image-8f0b4cce.gz.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/2c226c2e3d21/mount_0.gz
fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=10838f1a580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+796017...@syzkaller.appspotmail.com

=======================================================
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 ]---

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