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: 5572 Comm: syz.0.17 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: a8 fd 90 0f 0b e8 d2 09 4a fe 48 c7 c7 60 97 6e 8c 48 c7 c6 a0 94 6e 8c ba 33 0c 00 00 48 c7 c1 a0 9f 6e 8c e8 e3 ab a8 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:ffffc900027d7618 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: 9316ac2b3e421000
RDX: 0000000000000000 RSI: 8000000000000000 RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffffc900027d73a7 R09: 1ffff920004fae74
R10: dffffc0000000000 R11: fffff520004fae75 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  000055555d3fa500(0000) GS:ffff88808a9fe000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f193cc51000 CR3: 000000004132e000 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
 diNewIAG fs/jfs/jfs_imap.c:2510 [inline]
 diAllocExt fs/jfs/jfs_imap.c:1905 [inline]
 diAllocAG+0xaaa/0x1de0 fs/jfs/jfs_imap.c:1669
 diAlloc+0x1e2/0x16b0 fs/jfs/jfs_imap.c:1590
 ialloc+0x8c/0x8e0 fs/jfs/jfs_inode.c:56
 jfs_mkdir+0x1dd/0xaf0 fs/jfs/namei.c:226
 vfs_mkdir+0x411/0x660 fs/namei.c:5428
 filename_mkdirat+0x284/0x550 fs/namei.c:5461
 __do_sys_mkdirat fs/namei.c:5482 [inline]
 __se_sys_mkdirat+0x35/0x150 fs/namei.c:5479
 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: 0033:0x7f00c0b9fb19
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:00007ffd1ef20ed8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f00c0e25fa0 RCX: 00007f00c0b9fb19
RDX: 0000000000000100 RSI: 00002000000000c0 RDI: ffffffffffffff9c
RBP: 00007f00c0c37b70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f00c0e25fac R14: 00007f00c0e25fa0 R15: 00007f00c0e25fa0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindBits+0x19e/0x1a0 fs/jfs/jfs_dmap.c:3123
Code: a8 fd 90 0f 0b e8 d2 09 4a fe 48 c7 c7 60 97 6e 8c 48 c7 c6 a0 94 6e 8c ba 33 0c 00 00 48 c7 c1 a0 9f 6e 8c e8 e3 ab a8 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:ffffc900027d7618 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: 9316ac2b3e421000
RDX: 0000000000000000 RSI: 8000000000000000 RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffffc900027d73a7 R09: 1ffff920004fae74
R10: dffffc0000000000 R11: fffff520004fae75 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  000055555d3fa500(0000) GS:ffff88808a9fe000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f193cc2c000 CR3: 000000004132e000 CR4: 0000000000352ef0