BUG at fs/jfs/jfs_dtree.c:1942 assert(dtlck->index == 0)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dtree.c:1942!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5995 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:dtSplitRoot+0x1694/0x16c0 fs/jfs/jfs_dtree.c:1942
Code: e9 49 f3 ff ff e8 cc d9 67 fe 48 c7 c7 e0 37 0b 8c 48 c7 c6 c0 36 0b 8c ba 96 07 00 00 48 c7 c1 80 38 0b 8c e8 9d f8 c9 fd 90 <0f> 0b e8 a5 d9 67 fe 48 c7 c7 e0 37 0b 8c 48 c7 c6 c0 36 0b 8c ba
RSP: 0018:ffffc9000d1ff288 EFLAGS: 00010246
RAX: 0000000000000038 RBX: 0000000000001000 RCX: b79e75286e83df00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc900010370f3 R08: ffffc9000d1ff007 R09: 1ffff92001a3fe00
R10: dffffc0000000000 R11: fffff52001a3fe01 R12: dffffc0000000000
R13: 1ffff92000206e1e R14: 0000000000000003 R15: ffffc900010370d8
FS:  00007f7cda36e6c0(0000) GS:ffff88808ca59000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1772883eb8 CR3: 0000000053d09000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 dtSplitUp fs/jfs/jfs_dtree.c:1244 [inline]
 dtInsert+0x246b/0x5f10 fs/jfs/jfs_dtree.c:871
 jfs_create+0x75b/0xb10 fs/jfs/namei.c:138
 lookup_open fs/namei.c:4483 [inline]
 open_last_lookups fs/namei.c:4583 [inline]
 path_openat+0x1395/0x3860 fs/namei.c:4827
 do_file_open+0x23e/0x4a0 fs/namei.c:4859
 do_sys_openat2+0x113/0x200 fs/open.c:1366
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_creat fs/open.c:1450 [inline]
 __se_sys_creat fs/open.c:1444 [inline]
 __x64_sys_creat+0x8f/0xc0 fs/open.c:1444
 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: 0033:0x7f7cd959af39
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:00007f7cda36e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f7cd9805fa0 RCX: 00007f7cd959af39
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000580
RBP: 00007f7cd962fee0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7cd9806038 R14: 00007f7cd9805fa0 R15: 00007ffecc67d3d8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dtSplitRoot+0x1694/0x16c0 fs/jfs/jfs_dtree.c:1942
Code: e9 49 f3 ff ff e8 cc d9 67 fe 48 c7 c7 e0 37 0b 8c 48 c7 c6 c0 36 0b 8c ba 96 07 00 00 48 c7 c1 80 38 0b 8c e8 9d f8 c9 fd 90 <0f> 0b e8 a5 d9 67 fe 48 c7 c7 e0 37 0b 8c 48 c7 c6 c0 36 0b 8c ba
RSP: 0018:ffffc9000d1ff288 EFLAGS: 00010246
RAX: 0000000000000038 RBX: 0000000000001000 RCX: b79e75286e83df00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc900010370f3 R08: ffffc9000d1ff007 R09: 1ffff92001a3fe00
R10: dffffc0000000000 R11: fffff52001a3fe01 R12: dffffc0000000000
R13: 1ffff92000206e1e R14: 0000000000000003 R15: ffffc900010370d8
FS:  00007f7cda36e6c0(0000) GS:ffff88808ca59000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f97811107e8 CR3: 0000000053d09000 CR4: 0000000000352ef0