BUG at fs/jfs/jfs_dmap.c:3070 assert(n < 4)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:3070!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 11303 Comm: syz.2.918 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:dbFindLeaf+0x51d/0x520
Code: e9 4c ff ff ff e8 33 bf 66 fe 48 c7 c7 60 b4 0b 8c 48 c7 c6 a0 b1 0b 8c ba fe 0b 00 00 48 c7 c1 80 bf 0b 8c e8 a4 c8 c8 fd 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57
RSP: 0018:ffffc900094dfaa8 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 051f874811976700
RDX: ffffc9000f878000 RSI: 000000000000183a RDI: 000000000000183b
RBP: 0000000000000003 R08: ffffc900094df827 R09: 1ffff9200129bf04
R10: dffffc0000000000 R11: fffff5200129bf05 R12: 000000000000000a
R13: 0000000000000008 R14: 0000000000000005 R15: 0000000000000155
FS:  00007fb5f58506c0(0000) GS:ffff88818dc93000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005596febcc000 CR3: 00000001b04fe000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 dbAllocDmapLev+0x60/0x3c0
 dbAllocCtl+0x14a/0x9c0
 dbAllocAG+0xba1/0xf80
 dbDiscardAG+0x2da/0x8f0
 jfs_ioc_trim+0x429/0x690
 jfs_ioctl+0x28e/0x3b0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb5f499cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb5f5850028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb5f4c15fa0 RCX: 00007fb5f499cdd9
RDX: 0000200000000680 RSI: 00000000c0185879 RDI: 0000000000000007
RBP: 00007fb5f4a32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb5f4c16038 R14: 00007fb5f4c15fa0 R15: 00007ffd61bfc938
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindLeaf+0x51d/0x520
Code: e9 4c ff ff ff e8 33 bf 66 fe 48 c7 c7 60 b4 0b 8c 48 c7 c6 a0 b1 0b 8c ba fe 0b 00 00 48 c7 c1 80 bf 0b 8c e8 a4 c8 c8 fd 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57
RSP: 0018:ffffc900094dfaa8 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 051f874811976700
RDX: ffffc9000f878000 RSI: 000000000000183a RDI: 000000000000183b
RBP: 0000000000000003 R08: ffffc900094df827 R09: 1ffff9200129bf04
R10: dffffc0000000000 R11: fffff5200129bf05 R12: 000000000000000a
R13: 0000000000000008 R14: 0000000000000005 R15: 0000000000000155
FS:  00007fb5f58506c0(0000) GS:ffff88818dc93000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f683d7ea2f8 CR3: 00000001b04fe000 CR4: 00000000000006f0
