ERROR: (device loop0): txBegin: read-only filesystem

ERROR: (device loop0): remounting filesystem as read-only
find_entry called with index = 0
find_entry called with index = 0
find_entry called with index = 0
find_entry called with index = 0
Oops: general protection fault, probably for non-canonical address 0xdffffc00000000c5: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000628-0x000000000000062f]
CPU: 0 UID: 0 PID: 5337 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:JFS_SBI fs/jfs/jfs_incore.h:217 [inline]
RIP: 0010:txEnd+0xb4/0x530 fs/jfs/jfs_txnmgr.c:508
Code: 49 8d 5e 20 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 2c 1a ce fe 41 bf 28 06 00 00 4c 03 3b 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 0d 1a ce fe 49 8b 1f 48 83 c3 30
RSP: 0018:ffffc9000397fac0 EFLAGS: 00010206
RAX: 00000000000000c5 RBX: ffffc90000f01020 RCX: 0000000000000000
RDX: 0000000000000006 RSI: ffffffff8dfa9787 RDI: 00000000ffffffff
RBP: ffffc9000397fd60 R08: ffffffff903059f7 R09: 1ffffffff2060b3e
R10: dffffc0000000000 R11: fffffbfff2060b3f R12: 00000000ffffffe2
R13: dffffc0000000000 R14: ffffc90000f01000 R15: 0000000000000628
FS:  00007fb7333da6c0(0000) GS:ffff88808c895000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb73341af68 CR3: 0000000012908000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 jfs_mkdir+0x37e/0xb00 fs/jfs/namei.c:294
 vfs_mkdir+0x413/0x630 fs/namei.c:5261
 filename_mkdirat+0x285/0x510 fs/namei.c:5294
 __do_sys_mkdirat fs/namei.c:5315 [inline]
 __se_sys_mkdirat+0x35/0x150 fs/namei.c:5312
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb73259bcc7
Code: 00 66 90 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 db f7 ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 b8 02 01 00 00 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:00007fb7333d9e18 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007fb7333d9ea0 RCX: 00007fb73259bcc7
RDX: 00000000000001ff RSI: 0000200000002080 RDI: 00000000ffffff9c
RBP: 0000200000002040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000002040 R11: 0000000000000246 R12: 0000200000002080
R13: 00007fb7333d9e60 R14: 0000000000000000 R15: 0000200000000940
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:JFS_SBI fs/jfs/jfs_incore.h:217 [inline]
RIP: 0010:txEnd+0xb4/0x530 fs/jfs/jfs_txnmgr.c:508
Code: 49 8d 5e 20 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 2c 1a ce fe 41 bf 28 06 00 00 4c 03 3b 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 0d 1a ce fe 49 8b 1f 48 83 c3 30
RSP: 0018:ffffc9000397fac0 EFLAGS: 00010206
RAX: 00000000000000c5 RBX: ffffc90000f01020 RCX: 0000000000000000
RDX: 0000000000000006 RSI: ffffffff8dfa9787 RDI: 00000000ffffffff
RBP: ffffc9000397fd60 R08: ffffffff903059f7 R09: 1ffffffff2060b3e
R10: dffffc0000000000 R11: fffffbfff2060b3f R12: 00000000ffffffe2
R13: dffffc0000000000 R14: ffffc90000f01000 R15: 0000000000000628
FS:  00007fb7333da6c0(0000) GS:ffff88808c895000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb73341af68 CR3: 0000000012908000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	49 8d 5e 20          	lea    0x20(%r14),%rbx
   4:	48 89 d8             	mov    %rbx,%rax
   7:	48 c1 e8 03          	shr    $0x3,%rax
   b:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
  10:	74 08                	je     0x1a
  12:	48 89 df             	mov    %rbx,%rdi
  15:	e8 2c 1a ce fe       	call   0xfece1a46
  1a:	41 bf 28 06 00 00    	mov    $0x628,%r15d
  20:	4c 03 3b             	add    (%rbx),%r15
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 ff             	mov    %r15,%rdi
  34:	e8 0d 1a ce fe       	call   0xfece1a46
  39:	49 8b 1f             	mov    (%r15),%rbx
  3c:	48 83 c3 30          	add    $0x30,%rbx