ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
gfs2: fsid=syz:syz.0: about to withdraw this file system
 slab gfs2_quotad start ffff888051f0a000 pointer offset 120 size 272
list_add corruption. prev->next should be next (ffff8881412ae800), but was ffff888051f0a078. (prev=ffff888051f0a078).
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:34!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 15274 Comm: gfs2_quotad/syz Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__list_add_valid_or_report+0x123/0x130 lib/list_debug.c:32
Code: e8 42 ea 6f fd 43 80 3c 2c 00 74 08 4c 89 f7 e8 03 cf 91 fd 49 8b 16 48 c7 c7 c0 0e c0 8b 48 89 de 4c 89 f1 e8 6e cd 91 fc 90 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000b707a98 EFLAGS: 00010246
RAX: 0000000000000075 RBX: ffff8881412ae800 RCX: ab13297335682000
RDX: 0000000000000000 RSI: 0000000080000002 RDI: 0000000000000000
RBP: 1ffff11028255d01 R08: ffffc9000b7077c7 R09: 1ffff920016e0ef8
R10: dffffc0000000000 R11: fffff520016e0ef9 R12: 1ffff1100a3e140f
R13: dffffc0000000000 R14: ffff888051f0a078 R15: ffff888051f0a078
FS:  0000000000000000(0000) GS:ffff888126084000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555737a2808 CR3: 000000003163c000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 __list_add_valid include/linux/list.h:96 [inline]
 __list_add include/linux/list.h:158 [inline]
 list_add_tail include/linux/list.h:191 [inline]
 list_lru_add+0xf2/0x270 mm/list_lru.c:171
 qd_put+0x114/0x190 fs/gfs2/quota.c:342
 gfs2_quota_sync+0x3c4/0x460 fs/gfs2/quota.c:1361
 gfs2_quotad+0x3d5/0x930 fs/gfs2/quota.c:1607
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_add_valid_or_report+0x123/0x130 lib/list_debug.c:32
Code: e8 42 ea 6f fd 43 80 3c 2c 00 74 08 4c 89 f7 e8 03 cf 91 fd 49 8b 16 48 c7 c7 c0 0e c0 8b 48 89 de 4c 89 f1 e8 6e cd 91 fc 90 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000b707a98 EFLAGS: 00010246
RAX: 0000000000000075 RBX: ffff8881412ae800 RCX: ab13297335682000
RDX: 0000000000000000 RSI: 0000000080000002 RDI: 0000000000000000
RBP: 1ffff11028255d01 R08: ffffc9000b7077c7 R09: 1ffff920016e0ef8
R10: dffffc0000000000 R11: fffff520016e0ef9 R12: 1ffff1100a3e140f
R13: dffffc0000000000 R14: ffff888051f0a078 R15: ffff888051f0a078
FS:  0000000000000000(0000) GS:ffff888126084000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555737a2808 CR3: 000000003163c000 CR4: 0000000000350ef0