loop0: detected capacity change from 0 to 32768
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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: 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:3036
Code: cb fd 90 0f 0b e8 62 86 69 fe 48 c7 c7 a0 24 0b 8c 48 c7 c6 e0 21 0b 8c ba dc 0b 00 00 48 c7 c1 e0 2c 0b 8c e8 e3 a8 cb 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:ffffc9000df1f0d0 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: fd9670789cec2000
RDX: ffffc9000ec32000 RSI: 0000000000005a09 RDI: 0000000000005a0a
RBP: 00000000ffffffff R08: ffff88801fc247d3 R09: 1ffff11003f848fa
R10: dffffc0000000000 R11: ffffed1003f848fb R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007fb85dbb76c0(0000) GS:ffff88808ca5d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002000 CR3: 0000000042070000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 dbAllocNear+0x244/0x3d0 fs/jfs/jfs_dmap.c:1243
 dbAlloc+0x936/0xba0 fs/jfs/jfs_dmap.c:832
 extBalloc fs/jfs/jfs_extent.c:336 [inline]
 extAlloc+0x57d/0x1020 fs/jfs/jfs_extent.c:127
 jfs_get_block+0x358/0xad0 fs/jfs/inode.c:254
 __block_write_begin_int+0x6c6/0x1910 fs/buffer.c:2143
 block_write_begin+0x8d/0x120 fs/buffer.c:2254
 jfs_write_begin+0x35/0x80 fs/jfs/inode.c:306
 generic_perform_write+0x2e2/0x8f0 mm/filemap.c:4314
 generic_file_write_iter+0x14a/0x680 mm/filemap.c:4457
 aio_write+0x5cd/0x870 fs/aio.c:1634
 __io_submit_one fs/aio.c:-1 [inline]
 io_submit_one+0x7bb/0x14c0 fs/aio.c:2053
 __do_sys_io_submit fs/aio.c:2112 [inline]
 __se_sys_io_submit+0x195/0x340 fs/aio.c:2082
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb85cd9bf79
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:00007fb85dbb7028 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
RAX: ffffffffffffffda RBX: 00007fb85d015fa0 RCX: 00007fb85cd9bf79
RDX: 0000200000000540 RSI: 000000000000003b RDI: 00007fb85db6d000
RBP: 00007fb85ce327e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb85d016038 R14: 00007fb85d015fa0 R15: 00007fff3ed15b28
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindBits+0x19e/0x1a0 fs/jfs/jfs_dmap.c:3036
Code: cb fd 90 0f 0b e8 62 86 69 fe 48 c7 c7 a0 24 0b 8c 48 c7 c6 e0 21 0b 8c ba dc 0b 00 00 48 c7 c1 e0 2c 0b 8c e8 e3 a8 cb 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:ffffc9000df1f0d0 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: fd9670789cec2000
RDX: ffffc9000ec32000 RSI: 0000000000005a09 RDI: 0000000000005a0a
RBP: 00000000ffffffff R08: ffff88801fc247d3 R09: 1ffff11003f848fa
R10: dffffc0000000000 R11: ffffed1003f848fb R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007fb85dbb76c0(0000) GS:ffff88808ca5d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002000 CR3: 0000000042070000 CR4: 0000000000352ef0