loop0: detected capacity change from 0 to 32768
find_entry called with index = 0
read_mapping_page failed!
ERROR: (device loop0): txCommit: 

BUG at fs/jfs/jfs_dmap.c:3123 assert(bitno < 32)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:3123!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5338 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:3123
Code: a9 fd 90 0f 0b e8 a2 8d 4a fe 48 c7 c7 20 97 6e 8c 48 c7 c6 60 94 6e 8c ba 33 0c 00 00 48 c7 c1 60 9f 6e 8c e8 53 29 a9 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:ffffc9000df6f5d8 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: d67bbdfa4a117b00
RDX: ffffc9000ef0a000 RSI: 00000000000018bc RDI: 00000000000018bd
RBP: 00000000ffffffff R08: ffffc9000df6f367 R09: 1ffff92001bede6c
R10: dffffc0000000000 R11: fffff52001bede6d R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007fa74a1f56c0(0000) GS:ffff88808aa01000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa74df5b640 CR3: 0000000041850000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 dbAllocDmapLev+0x161/0x3b0 fs/jfs/jfs_dmap.c:2072
 dbAllocCtl+0x145/0x990 fs/jfs/jfs_dmap.c:1912
 dbAllocAG+0x1f4/0xf80 fs/jfs/jfs_dmap.c:1440
 dbAlloc+0x5ab/0xba0 fs/jfs/jfs_dmap.c:964
 dtSplitUp fs/jfs/jfs_dtree.c:979 [inline]
 dtInsert+0xb31/0x5cb0 fs/jfs/jfs_dtree.c:868
 jfs_create+0x730/0xae0 fs/jfs/namei.c:138
 vfs_create+0x2f4/0x4a0 fs/namei.c:4197
 filename_mknodat+0x3e8/0x660 fs/namei.c:5331
 __do_sys_mknod fs/namei.c:5368 [inline]
 __se_sys_mknod+0x3a/0x150 fs/namei.c:5365
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa74dd9f559
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:00007fa74a1f4fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007fa74e025fa0 RCX: 00007fa74dd9f559
RDX: 0000000000000701 RSI: 0000000000000000 RDI: 0000200000000000
RBP: 00007fa74de36b50 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa74e026038 R14: 00007fa74e025fa0 R15: 00007ffd13e8c7b8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindBits+0x19e/0x1a0 fs/jfs/jfs_dmap.c:3123
Code: a9 fd 90 0f 0b e8 a2 8d 4a fe 48 c7 c7 20 97 6e 8c 48 c7 c6 60 94 6e 8c ba 33 0c 00 00 48 c7 c1 60 9f 6e 8c e8 53 29 a9 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:ffffc9000df6f5d8 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: d67bbdfa4a117b00
RDX: ffffc9000ef0a000 RSI: 00000000000018bc RDI: 00000000000018bd
RBP: 00000000ffffffff R08: ffffc9000df6f367 R09: 1ffff92001bede6c
R10: dffffc0000000000 R11: fffff52001bede6d R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007fa74a1f56c0(0000) GS:ffff88808aa01000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa74df5b640 CR3: 0000000041850000 CR4: 0000000000352ef0