overlayfs: missing 'lowerdir'
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: 16931 Comm: syz.5.984 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:dbFindBits+0x177/0x1a0
Code: e9 20 ff ff ff e8 99 56 6a fe 48 c7 c7 a0 21 0b 8c 48 c7 c6 e0 1e 0b 8c ba cd 0b 00 00 48 c7 c1 c0 29 0b 8c e8 2a 71 cc fd 90 <0f> 0b e8 72 56 6a fe 48 c7 c7 a0 21 0b 8c 48 c7 c6 e0 1e 0b 8c ba
RSP: 0018:ffffc90003a37ac0 EFLAGS: 00010246
RAX: 0000000000000032 RBX: 000000000000000a RCX: 8c0099f0444a8c00
RDX: ffffc90025fee000 RSI: 0000000000000bcf RDI: 0000000000000bd0
RBP: 00000000ffffffff R08: ffffc90003a37847 R09: 1ffff92000746f08
R10: dffffc0000000000 R11: fffff52000746f09 R12: 0000000000000000
R13: 000000000000000a R14: 0000000000000400 R15: ffff88816857c000
FS:  00007f2db94606c0(0000) GS:ffff88818de60000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff6d2ab308 CR3: 000000010e86e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 dbAllocDmapLev+0x16b/0x3c0
 dbAllocCtl+0x14a/0x9c0
 dbAllocAG+0x1e6/0xff0
 dbDiscardAG+0x2da/0x8f0
 jfs_ioc_trim+0x429/0x690
 jfs_ioctl+0x28e/0x3b0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2db859c799
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:00007f2db9460028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2db8815fa0 RCX: 00007f2db859c799
RDX: 0000200000000040 RSI: 00000000c0185879 RDI: 0000000000000009
RBP: 00007f2db8632c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2db8816038 R14: 00007f2db8815fa0 R15: 00007ffc9184c278
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindBits+0x177/0x1a0
Code: e9 20 ff ff ff e8 99 56 6a fe 48 c7 c7 a0 21 0b 8c 48 c7 c6 e0 1e 0b 8c ba cd 0b 00 00 48 c7 c1 c0 29 0b 8c e8 2a 71 cc fd 90 <0f> 0b e8 72 56 6a fe 48 c7 c7 a0 21 0b 8c 48 c7 c6 e0 1e 0b 8c ba
RSP: 0018:ffffc90003a37ac0 EFLAGS: 00010246
RAX: 0000000000000032 RBX: 000000000000000a RCX: 8c0099f0444a8c00
RDX: ffffc90025fee000 RSI: 0000000000000bcf RDI: 0000000000000bd0
RBP: 00000000ffffffff R08: ffffc90003a37847 R09: 1ffff92000746f08
R10: dffffc0000000000 R11: fffff52000746f09 R12: 0000000000000000
R13: 000000000000000a R14: 0000000000000400 R15: ffff88816857c000
FS:  00007f2db94606c0(0000) GS:ffff88818de60000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5a569ccff8 CR3: 000000010e86e000 CR4: 00000000000006f0
