loop0: detected capacity change from 0 to 32768
lmLogOpen: exit(-6)
ERROR: (device loop0): txBegin: read-only filesystem
ERROR: (device loop0): remounting filesystem as read-only
jfs_dirty_inode called on read-only volume
Is remount racy?
jfs_rename did not expect dtDelete to return rc = -2
ERROR: (device (efault)): jfs_rename: 
Oops: general protection fault, probably for non-canonical address 0xdffffc000000000a: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000050-0x0000000000000057]
CPU: 0 UID: 0 PID: 5336 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:sb_rdonly include/linux/fs/super.h:187 [inline]
RIP: 0010:jfs_handle_error fs/jfs/super.c:66 [inline]
RIP: 0010:jfs_error+0x130/0x2c0 fs/jfs/super.c:98
Code: 8d 4c 24 60 48 c7 c7 60 13 c5 8b 48 89 74 24 08 e8 35 80 fe ff 4d 8d 6f 50 4d 89 ee 49 c1 ee 03 48 b8 00 00 00 00 00 fc ff df <41> 80 3c 06 00 74 08 4c 89 ef e8 61 7e 00 01 4d 8b 65 00 4c 89 e6
RSP: 0018:ffffc9000edc77c0 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 1ffff92001db8f00 RCX: b8771c301d4d5400
RDX: ffffc90020802000 RSI: 0000000000002707 RDI: 0000000000002708
RBP: ffffc9000edc78d0 R08: ffff88801fc247d3 R09: 1ffff11003f848fa
R10: dffffc0000000000 R11: ffffed1003f848fb R12: ffffc9000edc7840
R13: 0000000000000050 R14: 000000000000000a R15: 0000000000000000
FS:  00007f680c8c86c0(0000) GS:ffff88808d22a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6cfd5909c0 CR3: 0000000036f6e000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 jfs_rename+0xb69/0x1610 fs/jfs/namei.c:1243
 vfs_rename+0xbb6/0xee0 fs/namei.c:5929
 do_renameat2+0x538/0x8e0 fs/namei.c:6047
 __do_sys_renameat2 fs/namei.c:6077 [inline]
 __se_sys_renameat2 fs/namei.c:6074 [inline]
 __x64_sys_renameat2+0xce/0xe0 fs/namei.c:6074
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f680b98f7c9
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:00007f680c8c8038 EFLAGS: 00000246 ORIG_RAX: 000000000000013c
RAX: ffffffffffffffda RBX: 00007f680bbe5fa0 RCX: 00007f680b98f7c9
RDX: ffffffffffffff9c RSI: 0000200000000580 RDI: ffffffffffffff9c
RBP: 00007f680ba13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 00002000000005c0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f680bbe6038 R14: 00007f680bbe5fa0 R15: 00007ffd41ea9778
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:sb_rdonly include/linux/fs/super.h:187 [inline]
RIP: 0010:jfs_handle_error fs/jfs/super.c:66 [inline]
RIP: 0010:jfs_error+0x130/0x2c0 fs/jfs/super.c:98
Code: 8d 4c 24 60 48 c7 c7 60 13 c5 8b 48 89 74 24 08 e8 35 80 fe ff 4d 8d 6f 50 4d 89 ee 49 c1 ee 03 48 b8 00 00 00 00 00 fc ff df <41> 80 3c 06 00 74 08 4c 89 ef e8 61 7e 00 01 4d 8b 65 00 4c 89 e6
RSP: 0018:ffffc9000edc77c0 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 1ffff92001db8f00 RCX: b8771c301d4d5400
RDX: ffffc90020802000 RSI: 0000000000002707 RDI: 0000000000002708
RBP: ffffc9000edc78d0 R08: ffff88801fc247d3 R09: 1ffff11003f848fa
R10: dffffc0000000000 R11: ffffed1003f848fb R12: ffffc9000edc7840
R13: 0000000000000050 R14: 000000000000000a R15: 0000000000000000
FS:  00007f680c8c86c0(0000) GS:ffff88808d22a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f680c8a6fc8 CR3: 0000000036f6e000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	8d 4c 24 60          	lea    0x60(%rsp),%ecx
   4:	48 c7 c7 60 13 c5 8b 	mov    $0xffffffff8bc51360,%rdi
   b:	48 89 74 24 08       	mov    %rsi,0x8(%rsp)
  10:	e8 35 80 fe ff       	call   0xfffe804a
  15:	4d 8d 6f 50          	lea    0x50(%r15),%r13
  19:	4d 89 ee             	mov    %r13,%r14
  1c:	49 c1 ee 03          	shr    $0x3,%r14
  20:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  27:	fc ff df
* 2a:	41 80 3c 06 00       	cmpb   $0x0,(%r14,%rax,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 ef             	mov    %r13,%rdi
  34:	e8 61 7e 00 01       	call   0x1007e9a
  39:	4d 8b 65 00          	mov    0x0(%r13),%r12
  3d:	4c 89 e6             	mov    %r12,%rsi