loop2: detected capacity change from 0 to 32768
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: 32699 Comm: syz.2.2071 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 b3 00 81 fe 48 c7 c7 00 dd c3 8b 48 c7 c6 40 da c3 8b ba a7 0b 00 00 48 c7 c1 c0 e7 c3 8b e8 24 f2 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:ffffc9000676fa98 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: c53452255ccad300
RDX: ffffc90029803000 RSI: 0000000000000e2c RDI: 0000000000000e2d
RBP: 0000000000000003 R08: ffffc9000676f7c7 R09: 1ffff92000cedef8
R10: dffffc0000000000 R11: fffff52000cedef9 R12: 000000000000000a
R13: 0000000000000008 R14: 0000000000000005 R15: 0000000000000155
FS:  00007f176b5776c0(0000) GS:ffff8880b8618000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f17605ffe00 CR3: 0000000011aaa000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 dbAllocDmapLev+0x60/0x3c0
 dbAllocCtl+0x14a/0x9c0
 dbAllocAG+0xc2b/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: 0033:0x7f176a78ebe9
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:00007f176b577038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f176a9c5fa0 RCX: 00007f176a78ebe9
RDX: 0000200000000080 RSI: 00000000c0185879 RDI: 0000000000000004
RBP: 00007f176a811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f176a9c6038 R14: 00007f176a9c5fa0 R15: 00007ffc7a246738
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindLeaf+0x51d/0x520
Code: e9 4c ff ff ff e8 b3 00 81 fe 48 c7 c7 00 dd c3 8b 48 c7 c6 40 da c3 8b ba a7 0b 00 00 48 c7 c1 c0 e7 c3 8b e8 24 f2 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:ffffc9000676fa98 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: c53452255ccad300
RDX: ffffc90029803000 RSI: 0000000000000e2c RDI: 0000000000000e2d
RBP: 0000000000000003 R08: ffffc9000676f7c7 R09: 1ffff92000cedef8
R10: dffffc0000000000 R11: fffff52000cedef9 R12: 000000000000000a
R13: 0000000000000008 R14: 0000000000000005 R15: 0000000000000155
FS:  00007f176b5776c0(0000) GS:ffff8880b8618000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f17605ffe00 CR3: 0000000011aaa000 CR4: 00000000000006f0
