syzbot

 slab gfs2_quotad start ffff88804fec57e0 pointer offset 120 size 272
list_add corruption. prev->next should be next (ffff88814044f800), but was ffff88804fec5858. (prev=ffff88804fec5858).
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:32!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 17171 Comm: syz.1.2418 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__list_add_valid_or_report+0x12b/0x190 lib/list_debug.c:32
Code: 00 00 00 00 fc ff df 48 89 f2 48 c1 ea 03 80 3c 02 00 75 5a 48 8b 16 48 89 f1 48 c7 c7 80 31 16 8c 48 89 ee e8 c6 54 b1 fc 90 <0f> 0b 48 89 f2 48 89 e9 4c 89 e6 48 c7 c7 00 32 16 8c e8 ae 54 b1
RSP: 0018:ffffc9000b667380 EFLAGS: 00010286
RAX: 0000000000000075 RBX: ffff88804fec5858 RCX: ffffc90014717000
RDX: 0000000000000000 RSI: ffffffff819aca66 RDI: 0000000000000005
RBP: ffff88814044f800 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000002 R11: 6464615f7473696c R12: ffff88804fec5858
R13: ffff88814044f808 R14: ffff88814044f800 R15: ffff88814044f818
FS:  00007f70c95206c0(0000) GS:ffff8881246bd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd1ab82413a CR3: 00000000729c3000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 __list_add_valid include/linux/list.h:88 [inline]
 __list_add include/linux/list.h:150 [inline]
 list_add_tail include/linux/list.h:183 [inline]
 list_lru_add+0xf6/0x2e0 mm/list_lru.c:171
 list_lru_add_obj+0x1ad/0x320 mm/list_lru.c:193
 qd_put+0x119/0x190 fs/gfs2/quota.c:342
 qdsb_put fs/gfs2/quota.c:500 [inline]
 gfs2_quota_unhold+0x1be/0x370 fs/gfs2/quota.c:653
 punch_hole+0xc71/0x37d0 fs/gfs2/bmap.c:1978
 gfs2_iomap_end+0x422/0x780 fs/gfs2/bmap.c:1178
 iomap_iter+0x308/0xf20 fs/iomap/iter.c:79
 iomap_file_buffered_write+0x240/0xac0 fs/iomap/buffered-io.c:1065
 gfs2_file_buffered_write+0x405/0xad0 fs/gfs2/file.c:1061
 gfs2_file_write_iter+0x9d8/0x11a0 fs/gfs2/file.c:1166
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x7d3/0x11d0 fs/read_write.c:686
 ksys_write+0x12a/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f70c878ebe9
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:00007f70c9520038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f70c89b6090 RCX: 00007f70c878ebe9
RDX: 000000000208e24b RSI: 0000200000000040 RDI: 0000000000000007
RBP: 00007f70c8811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f70c89b6128 R14: 00007f70c89b6090 R15: 00007ffea4cf3478
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_add_valid_or_report+0x12b/0x190 lib/list_debug.c:32
Code: 00 00 00 00 fc ff df 48 89 f2 48 c1 ea 03 80 3c 02 00 75 5a 48 8b 16 48 89 f1 48 c7 c7 80 31 16 8c 48 89 ee e8 c6 54 b1 fc 90 <0f> 0b 48 89 f2 48 89 e9 4c 89 e6 48 c7 c7 00 32 16 8c e8 ae 54 b1
RSP: 0018:ffffc9000b667380 EFLAGS: 00010286
RAX: 0000000000000075 RBX: ffff88804fec5858 RCX: ffffc90014717000
RDX: 0000000000000000 RSI: ffffffff819aca66 RDI: 0000000000000005
RBP: ffff88814044f800 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000002 R11: 6464615f7473696c R12: ffff88804fec5858
R13: ffff88814044f808 R14: ffff88814044f800 R15: ffff88814044f818
FS:  00007f70c95206c0(0000) GS:ffff8881246bd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd1ab82413a CR3: 00000000729c3000 CR4: 0000000000350ef0