loop0: detected capacity change from 0 to 32768
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: 5314 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: bd fd 90 0f 0b e8 b2 89 5c fe 48 c7 c7 a0 53 2d 8c 48 c7 c6 e0 50 2d 8c ba 33 0c 00 00 48 c7 c1 e0 5b 2d 8c e8 03 35 bd 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:ffffc9000f4271d8 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: 4a9ead61c7fec300
RDX: ffffc9000eb3a000 RSI: 0000000000001cc4 RDI: 0000000000001cc5
RBP: 00000000ffffffff R08: ffffc9000f426f67 R09: 1ffff92001e84dec
R10: dffffc0000000000 R11: fffff52001e84ded R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007f84a24276c0(0000) GS:ffff88808c519000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcbb6d909c0 CR3: 000000005027e000 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
 lookup_open+0xc0d/0x1a40 fs/namei.c:4567
 open_last_lookups fs/namei.c:4767 [inline]
 path_openat+0x677/0x1d60 fs/namei.c:4997
 do_file_open+0x23e/0x4a0 fs/namei.c:5029
 do_sys_openat2+0x115/0x200 fs/open.c:1417
 do_sys_open fs/open.c:1423 [inline]
 __do_sys_openat fs/open.c:1439 [inline]
 __se_sys_openat fs/open.c:1434 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1434
 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: 0033:0x7f84a159e0d9
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:00007f84a2426fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f84a1825fa0 RCX: 00007f84a159e0d9
RDX: 0000000000101842 RSI: 00002000000000c0 RDI: ffffffffffffff9c
RBP: 00007f84a1635024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000122 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f84a1826038 R14: 00007f84a1825fa0 R15: 00007ffe9054baa8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindBits+0x19e/0x1a0 fs/jfs/jfs_dmap.c:3123
Code: bd fd 90 0f 0b e8 b2 89 5c fe 48 c7 c7 a0 53 2d 8c 48 c7 c6 e0 50 2d 8c ba 33 0c 00 00 48 c7 c1 e0 5b 2d 8c e8 03 35 bd 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:ffffc9000f4271d8 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: 4a9ead61c7fec300
RDX: ffffc9000eb3a000 RSI: 0000000000001cc4 RDI: 0000000000001cc5
RBP: 00000000ffffffff R08: ffffc9000f426f67 R09: 1ffff92001e84dec
R10: dffffc0000000000 R11: fffff52001e84ded R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007f84a24276c0(0000) GS:ffff88808c519000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8495400000 CR3: 000000005027e000 CR4: 0000000000352ef0