loop0: detected capacity change from 0 to 32768
loop0: detected capacity change from 32768 to 32767
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 NOPTI
CPU: 0 UID: 0 PID: 5358 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:dbFindLeaf+0x51d/0x520 fs/jfs/jfs_dmap.c:2983
Code: e9 4c ff ff ff e8 a3 44 7f fe 48 c7 c7 c0 f3 c3 8b 48 c7 c6 00 f1 c3 8b ba a7 0b 00 00 48 c7 c1 80 fe c3 8b e8 e4 15 e7 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:ffffc9000fc7f208 EFLAGS: 00010246
RAX: 000000000000002b RBX: 00000000ffffffff RCX: 16e680087c61d300
RDX: ffffc9000dbc2000 RSI: 0000000000001106 RDI: 0000000000001107
RBP: 0000000008ffff09 R08: ffffc9000fc7ef27 R09: 1ffff92001f8fde4
R10: dffffc0000000000 R11: fffff52001f8fde5 R12: 0000000000000000
R13: 000000000000000c R14: 0000000000000009 R15: 0000000000000155
FS:  00007f2253be46c0(0000) GS:ffff88808d20a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055dd0b39a168 CR3: 00000000435d3000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 dbAllocDmapLev+0x60/0x3c0 fs/jfs/jfs_dmap.c:1969
 dbAllocCtl+0x14a/0x9c0 fs/jfs/jfs_dmap.c:1825
 dbAllocAG+0x1e6/0xff0 fs/jfs/jfs_dmap.c:1353
 dbAlloc+0x5a8/0xba0 fs/jfs/jfs_dmap.c:877
 diNewIAG fs/jfs/jfs_imap.c:2510 [inline]
 diAllocExt fs/jfs/jfs_imap.c:1905 [inline]
 diAllocAG+0xd45/0x1df0 fs/jfs/jfs_imap.c:1669
 diAlloc+0x1d5/0x1680 fs/jfs/jfs_imap.c:1590
 ialloc+0x8c/0x8f0 fs/jfs/jfs_inode.c:56
 jfs_create+0x18d/0xa80 fs/jfs/namei.c:92
 lookup_open fs/namei.c:3708 [inline]
 open_last_lookups fs/namei.c:3807 [inline]
 path_openat+0x14f4/0x3830 fs/namei.c:4043
 do_filp_open+0x1fa/0x410 fs/namei.c:4073
 do_sys_openat2+0x121/0x1c0 fs/open.c:1435
 do_sys_open fs/open.c:1450 [inline]
 __do_sys_open fs/open.c:1458 [inline]
 __se_sys_open fs/open.c:1454 [inline]
 __x64_sys_open+0x11e/0x150 fs/open.c:1454
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2252d8eba9
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:00007f2253be4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f2252fd5fa0 RCX: 00007f2252d8eba9
RDX: 0000000000000000 RSI: 0000000000143142 RDI: 0000200000000140
RBP: 00007f2252e11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2252fd6038 R14: 00007f2252fd5fa0 R15: 00007ffd2a2beb28
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindLeaf+0x51d/0x520 fs/jfs/jfs_dmap.c:2983
Code: e9 4c ff ff ff e8 a3 44 7f fe 48 c7 c7 c0 f3 c3 8b 48 c7 c6 00 f1 c3 8b ba a7 0b 00 00 48 c7 c1 80 fe c3 8b e8 e4 15 e7 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:ffffc9000fc7f208 EFLAGS: 00010246
RAX: 000000000000002b RBX: 00000000ffffffff RCX: 16e680087c61d300
RDX: ffffc9000dbc2000 RSI: 0000000000001106 RDI: 0000000000001107
RBP: 0000000008ffff09 R08: ffffc9000fc7ef27 R09: 1ffff92001f8fde4
R10: dffffc0000000000 R11: fffff52001f8fde5 R12: 0000000000000000
R13: 000000000000000c R14: 0000000000000009 R15: 0000000000000155
FS:  00007f2253be46c0(0000) GS:ffff88808d20a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055dd0b39a168 CR3: 00000000435d3000 CR4: 0000000000352ef0