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: 5352 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: aa fd 90 0f 0b e8 b2 3f 4c fe 48 c7 c7 20 7c 6e 8c 48 c7 c6 60 79 6e 8c ba 33 0c 00 00 48 c7 c1 60 84 6e 8c e8 03 e7 aa 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:ffffc9000e237598 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: 60590a3c46125100
RDX: ffffc9000ef4a000 RSI: 0000000000001b4a RDI: 0000000000001b4b
RBP: 00000000ffffffff R08: ffffc9000e237327 R09: 1ffff92001c46e64
R10: dffffc0000000000 R11: fffff52001c46e65 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007fcec9f326c0(0000) GS:ffff88808ac1d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000063c0 CR3: 0000000013473000 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_link+0x370/0x610 fs/jfs/namei.c:827
 vfs_link+0x49a/0x650 fs/namei.c:5937
 filename_linkat+0x26d/0x5e0 fs/namei.c:6005
 __do_sys_link fs/namei.c:6038 [inline]
 __se_sys_link+0x55/0x2c0 fs/namei.c:6034
 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: 0033:0x7fcec8f9f559
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:00007fcec9f31fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000056
RAX: ffffffffffffffda RBX: 00007fcec9225fa0 RCX: 00007fcec8f9f559
RDX: 0000000000000000 RSI: 000020000000e800 RDI: 000020000000e7c0
RBP: 00007fcec9036b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcec9226038 R14: 00007fcec9225fa0 R15: 00007ffe1f0c5ce8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindBits+0x19e/0x1a0 fs/jfs/jfs_dmap.c:3123
Code: aa fd 90 0f 0b e8 b2 3f 4c fe 48 c7 c7 20 7c 6e 8c 48 c7 c6 60 79 6e 8c ba 33 0c 00 00 48 c7 c1 60 84 6e 8c e8 03 e7 aa 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:ffffc9000e237598 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: 60590a3c46125100
RDX: ffffc9000ef4a000 RSI: 0000000000001b4a RDI: 0000000000001b4b
RBP: 00000000ffffffff R08: ffffc9000e237327 R09: 1ffff92001c46e64
R10: dffffc0000000000 R11: fffff52001c46e65 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007fcec9f326c0(0000) GS:ffff88808ac1d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f233a836ad8 CR3: 0000000013473000 CR4: 0000000000352ef0