ERROR: (device loop0): dbAllocNext: Corrupt dmap page
BUG at fs/jfs/jfs_dmap.c:3021 assert(nb <= DBWORD)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:3021!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 17855 Comm: syz.0.1068 Tainted: G        W           syzkaller #0 PREEMPT_{RT,(full)} 
CPU: 0 UID: 0 PID: 17855 Comm: syz.0.1068 Tainted: G        W           syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:dbFindBits+0x177/0x1a0 fs/jfs/jfs_dmap.c:3021
Code: e9 20 ff ff ff e8 c9 10 8a fe 48 c7 c7 40 75 43 8b 48 c7 c6 80 72 43 8b ba cd 0b 00 00 48 c7 c1 00 7d 43 8b e8 5a 05 f3 fd 90 <0f> 0b e8 a2 10 8a fe 48 c7 c7 40 75 43 8b 48 c7 c6 80 72 43 8b ba
RSP: 0018:ffffc90003ac7ab8 EFLAGS: 00010246
RAX: 0000000000000032 RBX: 000000000000000a RCX: 6996afcfe65a9300
RDX: ffffc90018f17000 RSI: 0000000000000741 RDI: 0000000000000742
RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1017104863 R12: 0000000000000000
R13: 000000000000000a R14: 0000000000000400 R15: ffff888020fa2000
FS:  00007fa5bd3fe6c0(0000) GS:ffff8881268c5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd63350cfeb CR3: 000000005297e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 dbAllocDmapLev+0x16b/0x3c0 fs/jfs/jfs_dmap.c:1985
 dbAllocCtl+0x14a/0x9c0 fs/jfs/jfs_dmap.c:1825
 dbAllocAG+0x1e6/0xff0 fs/jfs/jfs_dmap.c:1353
 dbDiscardAG+0x2df/0x900 fs/jfs/jfs_dmap.c:1608
 jfs_ioc_trim+0x429/0x690 fs/jfs/jfs_discard.c:106
 jfs_ioctl+0x2b8/0x3d0 fs/jfs/ioctl.c:131
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:598 [inline]
 __se_sys_ioctl+0xff/0x170 fs/ioctl.c:584
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa5bf19ebe9
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:00007fa5bd3fe038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa5bf3c5fa0 RCX: 00007fa5bf19ebe9
RDX: 00002000000004c0 RSI: 00000000c0185879 RDI: 0000000000000008
RBP: 00007fa5bf221e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa5bf3c6038 R14: 00007fa5bf3c5fa0 R15: 00007ffea513d858
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindBits+0x177/0x1a0 fs/jfs/jfs_dmap.c:3021
Code: e9 20 ff ff ff e8 c9 10 8a fe 48 c7 c7 40 75 43 8b 48 c7 c6 80 72 43 8b ba cd 0b 00 00 48 c7 c1 00 7d 43 8b e8 5a 05 f3 fd 90 <0f> 0b e8 a2 10 8a fe 48 c7 c7 40 75 43 8b 48 c7 c6 80 72 43 8b ba
RSP: 0018:ffffc90003ac7ab8 EFLAGS: 00010246
RAX: 0000000000000032 RBX: 000000000000000a RCX: 6996afcfe65a9300
RDX: ffffc90018f17000 RSI: 0000000000000741 RDI: 0000000000000742
RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1017104863 R12: 0000000000000000
R13: 000000000000000a R14: 0000000000000400 R15: ffff888020fa2000
FS:  00007fa5bd3fe6c0(0000) GS:ffff8881269c5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd46353deb8 CR3: 000000005297e000 CR4: 00000000003526f0