loop0: detected capacity change from 0 to 32768
=======================================================
WARNING: The mand mount option has been deprecated and
         and is ignored by this kernel. Remove the mand
         option from the mount to silence this warning.
=======================================================
loop0: detected capacity change from 32768 to 32767
BUG at fs/jfs/jfs_dmap.c:2983 assert(n < 4)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:2983!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5364 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~bpo12+1 04/01/2014
RIP: 0010:dbFindLeaf+0x51d/0x520 fs/jfs/jfs_dmap.c:2983
Code: e9 4c ff ff ff e8 73 82 7f fe 48 c7 c7 00 ee c3 8b 48 c7 c6 40 eb c3 8b ba a7 0b 00 00 48 c7 c1 c0 f8 c3 8b e8 24 67 e7 fd 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57
RSP: 0018:ffffc9000d2e7548 EFLAGS: 00010246
RAX: 000000000000002b RBX: 00000000ffffffff RCX: df0c06cae048f300
RDX: ffffc9000dd92000 RSI: 00000000000019ed RDI: 00000000000019ee
RBP: 000000000a04ffff R08: ffffc9000d2e7267 R09: 1ffff92001a5ce4c
R10: dffffc0000000000 R11: fffff52001a5ce4d R12: 0000000000000000
R13: 0000000000000010 R14: 000000000000000d R15: 0000000000000155
FS:  00007f55940896c0(0000) GS:ffff88808d20f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fefcedb3368 CR3: 000000003477d000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 dbAllocDmapLev+0x60/0x3c0 fs/jfs/jfs_dmap.c:1969
 dbAllocCtl+0x14a/0x9c0 fs/jfs/jfs_dmap.c:1825
 dbAllocAG+0x1e6/0xff0 fs/jfs/jfs_dmap.c:1353
 dbAlloc+0x5a8/0xba0 fs/jfs/jfs_dmap.c:877
 dtSplitUp fs/jfs/jfs_dtree.c:982 [inline]
 dtInsert+0xad5/0x5f40 fs/jfs/jfs_dtree.c:871
 jfs_link+0x312/0x550 fs/jfs/namei.c:826
 vfs_link+0x4ed/0x6e0 fs/namei.c:4854
 do_linkat+0x272/0x560 fs/namei.c:4924
 __do_sys_link fs/namei.c:4958 [inline]
 __se_sys_link fs/namei.c:4956 [inline]
 __x64_sys_link+0x82/0x90 fs/namei.c:4956
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f559318ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5594089038 EFLAGS: 00000246 ORIG_RAX: 0000000000000056
RAX: ffffffffffffffda RBX: 00007f55933b5fa0 RCX: 00007f559318ebe9
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 00002000000001c0
RBP: 00007f5593211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f55933b6038 R14: 00007f55933b5fa0 R15: 00007ffc3d9e5ad8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindLeaf+0x51d/0x520 fs/jfs/jfs_dmap.c:2983
Code: e9 4c ff ff ff e8 73 82 7f fe 48 c7 c7 00 ee c3 8b 48 c7 c6 40 eb c3 8b ba a7 0b 00 00 48 c7 c1 c0 f8 c3 8b e8 24 67 e7 fd 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57
RSP: 0018:ffffc9000d2e7548 EFLAGS: 00010246
RAX: 000000000000002b RBX: 00000000ffffffff RCX: df0c06cae048f300
RDX: ffffc9000dd92000 RSI: 00000000000019ed RDI: 00000000000019ee
RBP: 000000000a04ffff R08: ffffc9000d2e7267 R09: 1ffff92001a5ce4c
R10: dffffc0000000000 R11: fffff52001a5ce4d R12: 0000000000000000
R13: 0000000000000010 R14: 000000000000000d R15: 0000000000000155
FS:  00007f55940896c0(0000) GS:ffff88808d20f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d80d4b2138 CR3: 000000003477d000 CR4: 0000000000352ef0