Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 0 UID: 0 PID: 12802 Comm: syz.4.1015 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline]
RIP: 0010:jfs_flush_journal+0x9ad/0xef0 fs/jfs/jfs_logmgr.c:1581
Code: e8 aa fe 4d 8d 75 f0 4c 89 f0 48 c1 e8 03 80 3c 18 00 74 08 4c 89 f7 e8 41 76 d6 fe 4d 8b 36 49 83 c6 30 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 25 76 d6 fe 49 8b 3e e8 7d e8 aa fe
RSP: 0000:ffffc90003cb7b20 EFLAGS: 00010206
RAX: 0000000000000006 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc9001cea8000 RSI: 00000000000044bf RDI: 00000000000044c0
RBP: ffffc90003cb7c58 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc90003cb7908 R11: fffff52000796f4e R12: 00000000000000a7
R13: ffff88802914e038 R14: 0000000000000030 R15: ffff88802a45bad8
FS:  00007f42ba6966c0(0000) GS:ffff88812633c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f527611d000 CR3: 0000000058054000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 jfs_umount_rw+0x75/0x130 fs/jfs/jfs_umount.c:134
 jfs_reconfigure+0x6f6/0xa00 fs/jfs/super.c:421
 reconfigure_super+0x227/0x8a0 fs/super.c:1080
 do_remount fs/namespace.c:3391 [inline]
 path_mount+0xdc5/0x10e0 fs/namespace.c:4151
 do_mount fs/namespace.c:4172 [inline]
 __do_sys_mount fs/namespace.c:4361 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4338
 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: 0033:0x7f42bc43c799
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:00007f42ba696028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f42bc6b5fa0 RCX: 00007f42bc43c799
RDX: 0000000000000000 RSI: 0000200000000100 RDI: 0000000000000000
RBP: 00007f42bc4d2c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000021 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f42bc6b6038 R14: 00007f42bc6b5fa0 R15: 00007fff81cb6d68
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline]
RIP: 0010:jfs_flush_journal+0x9ad/0xef0 fs/jfs/jfs_logmgr.c:1581
Code: e8 aa fe 4d 8d 75 f0 4c 89 f0 48 c1 e8 03 80 3c 18 00 74 08 4c 89 f7 e8 41 76 d6 fe 4d 8b 36 49 83 c6 30 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 25 76 d6 fe 49 8b 3e e8 7d e8 aa fe
RSP: 0000:ffffc90003cb7b20 EFLAGS: 00010206
RAX: 0000000000000006 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc9001cea8000 RSI: 00000000000044bf RDI: 00000000000044c0
RBP: ffffc90003cb7c58 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc90003cb7908 R11: fffff52000796f4e R12: 00000000000000a7
R13: ffff88802914e038 R14: 0000000000000030 R15: ffff88802a45bad8
FS:  00007f42ba6966c0(0000) GS:ffff88812633c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f527611d000 CR3: 0000000058054000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	e8 aa fe 4d 8d       	call   0x8d4dfeaf
   5:	75 f0                	jne    0xfffffff7
   7:	4c 89 f0             	mov    %r14,%rax
   a:	48 c1 e8 03          	shr    $0x3,%rax
   e:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1)
  12:	74 08                	je     0x1c
  14:	4c 89 f7             	mov    %r14,%rdi
  17:	e8 41 76 d6 fe       	call   0xfed6765d
  1c:	4d 8b 36             	mov    (%r14),%r14
  1f:	49 83 c6 30          	add    $0x30,%r14
  23:	4c 89 f0             	mov    %r14,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	4c 89 f7             	mov    %r14,%rdi
  33:	e8 25 76 d6 fe       	call   0xfed6765d
  38:	49 8b 3e             	mov    (%r14),%rdi
  3b:	e8 7d e8 aa fe       	call   0xfeaae8bd