loop0: detected capacity change from 0 to 32768
find_entry called with index = 0
read_mapping_page failed!
ERROR: (device loop0): txCommit: 
jfs_create: dtSearch returned -17
BUG at fs/jfs/jfs_dmap.c:3036 assert(bitno < 32)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:3036!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5322 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 04/01/2014
RIP: 0010:dbFindBits+0x19e/0x1a0 fs/jfs/jfs_dmap.c:3036
Code: d2 fd 90 0f 0b e8 22 f3 6e fe 48 c7 c7 e0 b9 ea 8b 48 c7 c6 20 b7 ea 8b ba dc 0b 00 00 48 c7 c1 20 c2 ea 8b e8 53 1d d2 fd 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41
RSP: 0018:ffffc9000bad7588 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: 77dab7ed7a9f1200
RDX: ffffc90020802000 RSI: 0000000000001e32 RDI: 0000000000001e33
RBP: 00000000ffffffff R08: ffffc9000bad7307 R09: 1ffff9200175ae60
R10: dffffc0000000000 R11: fffff5200175ae61 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007fc93abf56c0(0000) GS:ffff88808ccea000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd01b1d4120 CR3: 0000000011a7d000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 dbAllocDmapLev+0x16b/0x3c0 fs/jfs/jfs_dmap.c:1985
 dbAllocCtl+0x14a/0x9c0 fs/jfs/jfs_dmap.c:1825
 dbAllocAG+0x1e6/0xff0 fs/jfs/jfs_dmap.c:1353
 dbAlloc+0x5ab/0xba0 fs/jfs/jfs_dmap.c:877
 dtSplitUp fs/jfs/jfs_dtree.c:982 [inline]
 dtInsert+0xb53/0x5f10 fs/jfs/jfs_dtree.c:871
 jfs_mknod+0x6bd/0x9d0 fs/jfs/namei.c:1410
 vfs_mknod+0x7d0/0x8a0 fs/namei.c:4997
 do_mknodat+0x3d3/0x620 fs/namei.c:-1
 __do_sys_mknod fs/namei.c:5085 [inline]
 __se_sys_mknod fs/namei.c:5083 [inline]
 __x64_sys_mknod+0x8c/0xa0 fs/namei.c:5083
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc93e79aeb9
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:00007fc93abf5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007fc93ea15fa0 RCX: 00007fc93e79aeb9
RDX: 0000000000000700 RSI: 0000000000002000 RDI: 0000200000000380
RBP: 00007fc93e808c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc93ea16038 R14: 00007fc93ea15fa0 R15: 00007ffe55ddc648
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindBits+0x19e/0x1a0 fs/jfs/jfs_dmap.c:3036
Code: d2 fd 90 0f 0b e8 22 f3 6e fe 48 c7 c7 e0 b9 ea 8b 48 c7 c6 20 b7 ea 8b ba dc 0b 00 00 48 c7 c1 20 c2 ea 8b e8 53 1d d2 fd 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41
RSP: 0018:ffffc9000bad7588 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: 77dab7ed7a9f1200
RDX: ffffc90020802000 RSI: 0000000000001e32 RDI: 0000000000001e33
RBP: 00000000ffffffff R08: ffffc9000bad7307 R09: 1ffff9200175ae60
R10: dffffc0000000000 R11: fffff5200175ae61 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007fc93abf56c0(0000) GS:ffff88808ccea000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc93abd3ff0 CR3: 0000000011a7d000 CR4: 0000000000352ef0