loop0: detected capacity change from 0 to 32768
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: 5334 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:dtSplitRoot+0x1694/0x16c0 fs/jfs/jfs_dtree.c:1942
Code: e9 49 f3 ff ff e8 2c fc 77 fe 48 c7 c7 e0 88 a4 8b 48 c7 c6 c0 87 a4 8b ba 96 07 00 00 48 c7 c1 60 89 a4 8b e8 3d 01 df fd 90 <0f> 0b e8 05 fc 77 fe 48 c7 c7 e0 88 a4 8b 48 c7 c6 c0 87 a4 8b ba
RSP: 0018:ffffc9000d2b72a8 EFLAGS: 00010246
RAX: 0000000000000038 RBX: 0000000000001000 RCX: fed15c9989f28200
RDX: ffffc9000e352000 RSI: 0000000000002e3b RDI: 0000000000002e3c
RBP: ffffc9000155d4e3 R08: ffffc9000d2b6fc7 R09: 1ffff92001a56df8
R10: dffffc0000000000 R11: fffff52001a56df9 R12: dffffc0000000000
R13: 1ffff920002aba9c R14: 0000000000000003 R15: ffffc9000155d4c8
FS:  00007fe511fe56c0(0000) GS:ffff88808d722000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe505fff000 CR3: 0000000000ce3000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 dtSplitUp fs/jfs/jfs_dtree.c:1244 [inline]
 dtInsert+0x2525/0x5f40 fs/jfs/jfs_dtree.c:871
 jfs_create+0x6c8/0xa80 fs/jfs/namei.c:137
 lookup_open fs/namei.c:3866 [inline]
 open_last_lookups fs/namei.c:3965 [inline]
 path_openat+0x188f/0x3b80 fs/namei.c:4201
 do_filp_open+0x1fa/0x410 fs/namei.c:4231
 do_sys_openat2+0x121/0x1c0 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_creat fs/open.c:1530 [inline]
 __se_sys_creat fs/open.c:1524 [inline]
 __x64_sys_creat+0x8f/0xc0 fs/open.c:1524
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe51118f7c9
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:00007fe511fe5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007fe5113e5fa0 RCX: 00007fe51118f7c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000580
RBP: 00007fe511213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe5113e6038 R14: 00007fe5113e5fa0 R15: 00007ffe26280928
 </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 2c fc 77 fe 48 c7 c7 e0 88 a4 8b 48 c7 c6 c0 87 a4 8b ba 96 07 00 00 48 c7 c1 60 89 a4 8b e8 3d 01 df fd 90 <0f> 0b e8 05 fc 77 fe 48 c7 c7 e0 88 a4 8b 48 c7 c6 c0 87 a4 8b ba
RSP: 0018:ffffc9000d2b72a8 EFLAGS: 00010246
RAX: 0000000000000038 RBX: 0000000000001000 RCX: fed15c9989f28200
RDX: ffffc9000e352000 RSI: 0000000000002e3b RDI: 0000000000002e3c
RBP: ffffc9000155d4e3 R08: ffffc9000d2b6fc7 R09: 1ffff92001a56df8
R10: dffffc0000000000 R11: fffff52001a56df9 R12: dffffc0000000000
R13: 1ffff920002aba9c R14: 0000000000000003 R15: ffffc9000155d4c8
FS:  00007fe511fe56c0(0000) GS:ffff88808d722000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe511fc3fc8 CR3: 0000000000ce3000 CR4: 0000000000352ef0