loop7: detected capacity change from 0 to 32768
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: 1 UID: 0 PID: 16314 Comm: syz.7.2001 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+0x519/0x520
Code: e9 4e ff ff ff e8 a7 79 5f fe 48 c7 c7 60 4f 2c 8c 48 c7 c6 a0 4c 2c 8c ba fe 0b 00 00 48 c7 c1 80 5a 2c 8c e8 58 33 c0 fd 90 <0f> 0b 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000373fab0 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: c4e39c33ad7e8f00
RDX: ffffc90023b1e000 RSI: 0000000000001a06 RDI: 0000000000001a07
RBP: 0000000000000003 R08: ffffc9000373f827 R09: 1ffff920006e7f04
R10: dffffc0000000000 R11: fffff520006e7f05 R12: 000000000000000a
R13: 0000000000000005 R14: 0000000000000008 R15: 0000000000000155
FS:  00007f620ac0f6c0(0000) GS:ffff8882a8f4b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f61ffa0f000 CR3: 000000010076a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 dbAllocDmapLev+0x60/0x3b0
 dbAllocCtl+0x145/0x990
 dbAllocAG+0xbbd/0xf80
 dbDiscardAG+0x2d6/0x8f0
 jfs_ioc_trim+0x436/0x680
 jfs_ioctl+0x28e/0x3b0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6209d9e019
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:00007f620ac0f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f620a025fa0 RCX: 00007f6209d9e019
RDX: 0000200000000080 RSI: 00000000c0185879 RDI: 0000000000000004
RBP: 00007f6209e3500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f620a026038 R14: 00007f620a025fa0 R15: 00007fffc0b38668
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindLeaf+0x519/0x520
Code: e9 4e ff ff ff e8 a7 79 5f fe 48 c7 c7 60 4f 2c 8c 48 c7 c6 a0 4c 2c 8c ba fe 0b 00 00 48 c7 c1 80 5a 2c 8c e8 58 33 c0 fd 90 <0f> 0b 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000373fab0 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: c4e39c33ad7e8f00
RDX: ffffc90023b1e000 RSI: 0000000000001a06 RDI: 0000000000001a07
RBP: 0000000000000003 R08: ffffc9000373f827 R09: 1ffff920006e7f04
R10: dffffc0000000000 R11: fffff520006e7f05 R12: 000000000000000a
R13: 0000000000000005 R14: 0000000000000008 R15: 0000000000000155
FS:  00007f620ac0f6c0(0000) GS:ffff8882a8f4b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f61ffa0f000 CR3: 000000010076a000 CR4: 00000000000006f0
