BUG at fs/jfs/jfs_dmap.c:2983 assert(n < 4)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:2983!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 12288 Comm: syz.5.675 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 73 c0 80 fe 48 c7 c7 00 e2 c3 8b 48 c7 c6 40 df c3 8b ba a7 0b 00 00 48 c7 c1 c0 ec c3 8b e8 94 a2 e8 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:ffffc90002e27a98 EFLAGS: 00010246
RAX: 000000000000002b RBX: 00000000ffffffff RCX: 3864f55ed2e9bd00
RDX: ffffc9003a601000 RSI: 0000000000001253 RDI: 0000000000001254
RBP: 0000000000000001 R08: ffffc90002e277c7 R09: 1ffff920005c4ef8
R10: dffffc0000000000 R11: fffff520005c4ef9 R12: 0000000000000008
R13: 0000000000000060 R14: 000000000000005d R15: 0000000000000155
FS:  00007f7e22bd66c0(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f60fff8 CR3: 000000012ea92000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 dbAllocDmapLev+0x60/0x3c0
 dbAllocCtl+0x14a/0x9c0
 dbAllocAG+0x1e6/0xff0
 dbDiscardAG+0x2df/0x900
 jfs_ioc_trim+0x429/0x690
 jfs_ioctl+0x2b5/0x3d0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7e21d8eba9
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:00007f7e22bd6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f7e21fd5fa0 RCX: 00007f7e21d8eba9
RDX: 0000200000000080 RSI: 00000000c0185879 RDI: 000000000000000a
RBP: 00007f7e21e11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7e21fd6038 R14: 00007f7e21fd5fa0 R15: 00007fff6e3212c8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindLeaf+0x51d/0x520
Code: e9 4c ff ff ff e8 73 c0 80 fe 48 c7 c7 00 e2 c3 8b 48 c7 c6 40 df c3 8b ba a7 0b 00 00 48 c7 c1 c0 ec c3 8b e8 94 a2 e8 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:ffffc90002e27a98 EFLAGS: 00010246
RAX: 000000000000002b RBX: 00000000ffffffff RCX: 3864f55ed2e9bd00
RDX: ffffc9003a601000 RSI: 0000000000001253 RDI: 0000000000001254
RBP: 0000000000000001 R08: ffffc90002e277c7 R09: 1ffff920005c4ef8
R10: dffffc0000000000 R11: fffff520005c4ef9 R12: 0000000000000008
R13: 0000000000000060 R14: 000000000000005d R15: 0000000000000155
FS:  00007f7e22bd66c0(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb776b71440 CR3: 000000012ea92000 CR4: 00000000000006f0
