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: 5321 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: b6 fd 90 0f 0b e8 62 0b 57 fe 48 c7 c7 e0 da 4d 8c 48 c7 c6 20 d8 4d 8c ba 33 0c 00 00 48 c7 c1 20 e3 4d 8c e8 c3 e7 b6 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:ffffc9000e18f598 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: f8cc114d11335100
RDX: ffffc9000eb02000 RSI: 000000000000217a RDI: 000000000000217b
RBP: 00000000ffffffff R08: ffffc9000e18f327 R09: 1ffff92001c31e64
R10: dffffc0000000000 R11: fffff52001c31e65 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007fbac73826c0(0000) GS:ffff88808c2c3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbac67f36b8 CR3: 0000000042c10000 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+0x491/0x650 fs/namei.c:5925
 filename_linkat+0x26d/0x5e0 fs/namei.c:5993
 __do_sys_link fs/namei.c:6026 [inline]
 __se_sys_link+0x55/0x2c0 fs/namei.c:6022
 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: 0033:0x7fbac659e159
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:00007fbac7381fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000056
RAX: ffffffffffffffda RBX: 00007fbac6825fa0 RCX: 00007fbac659e159
RDX: 0000000000000000 RSI: 0000200000000840 RDI: 0000200000000940
RBP: 00007fbac663506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbac6826038 R14: 00007fbac6825fa0 R15: 00007ffd6e5c80d8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindBits+0x19e/0x1a0 fs/jfs/jfs_dmap.c:3123
Code: b6 fd 90 0f 0b e8 62 0b 57 fe 48 c7 c7 e0 da 4d 8c 48 c7 c6 20 d8 4d 8c ba 33 0c 00 00 48 c7 c1 20 e3 4d 8c e8 c3 e7 b6 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:ffffc9000e18f598 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: f8cc114d11335100
RDX: ffffc9000eb02000 RSI: 000000000000217a RDI: 000000000000217b
RBP: 00000000ffffffff R08: ffffc9000e18f327 R09: 1ffff92001c31e64
R10: dffffc0000000000 R11: fffff52001c31e65 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007fbac73826c0(0000) GS:ffff88808c2c3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbac67f36b8 CR3: 0000000042c10000 CR4: 0000000000352ef0