general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
CPU: 1 PID: 9859 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline]
RIP: 0010:lmLogSync+0x208/0x9f0 fs/jfs/jfs_logmgr.c:937
Code: 35 81 fe 4d 8d 7e d8 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 36 5d d9 fe 4d 8b 3f 49 83 c7 40 4c 89 f8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ff e8 1a 5d d9 fe 49 8b 3f e8 02 14 af fe
RSP: 0018:ffffc900033bfb80 EFLAGS: 00010202
RAX: 0000000000000008 RBX: dffffc0000000000 RCX: ffff88802aec3c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900033bfc88 R08: ffffc900033bfae7 R09: 0000000000000000
R10: ffffc900033bfaa0 R11: fffff52000677f5d R12: ffff88803090a000
R13: ffffc900033bfbe0 R14: ffff888062fc0438 R15: 0000000000000040
FS:  0000555593308500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055559288f9e8 CR3: 000000006a4e4000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 jfs_syncpt+0x7b/0x90 fs/jfs/jfs_logmgr.c:1041
 jfs_sync_fs+0x87/0xa0 fs/jfs/super.c:685
 sync_filesystem+0x1c2/0x220 fs/sync.c:66
 generic_shutdown_super+0x6f/0x2b0 fs/super.c:666
 kill_block_super+0x44/0x90 fs/super.c:1660
 deactivate_locked_super+0x97/0x100 fs/super.c:481
 cleanup_mnt+0x43b/0x4d0 fs/namespace.c:1259
 task_work_run+0x1d4/0x260 kernel/task_work.c:245
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3230d9c117
Code: a2 c7 05 7c 94 24 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc130a5cd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f3230e0471f RCX: 00007f3230d9c117
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc130a5d90
RBP: 00007ffc130a5d90 R08: 00007ffc130a6d90 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc130a6e20
R13: 00007f3230e0471f R14: 000000000003eb06 R15: 00007ffc130a6e60
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline]
RIP: 0010:lmLogSync+0x208/0x9f0 fs/jfs/jfs_logmgr.c:937
Code: 35 81 fe 4d 8d 7e d8 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 36 5d d9 fe 4d 8b 3f 49 83 c7 40 4c 89 f8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ff e8 1a 5d d9 fe 49 8b 3f e8 02 14 af fe
RSP: 0018:ffffc900033bfb80 EFLAGS: 00010202
RAX: 0000000000000008 RBX: dffffc0000000000 RCX: ffff88802aec3c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900033bfc88 R08: ffffc900033bfae7 R09: 0000000000000000
R10: ffffc900033bfaa0 R11: fffff52000677f5d R12: ffff88803090a000
R13: ffffc900033bfbe0 R14: ffff888062fc0438 R15: 0000000000000040
FS:  0000555593308500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055559288f9e8 CR3: 000000006a4e4000 CR4: 00000000003506e0
----------------
Code disassembly (best guess):
   0:	35 81 fe 4d 8d       	xor    $0x8d4dfe81,%eax
   5:	7e d8                	jle    0xffffffdf
   7:	4c 89 f8             	mov    %r15,%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 ff             	mov    %r15,%rdi
  17:	e8 36 5d d9 fe       	call   0xfed95d52
  1c:	4d 8b 3f             	mov    (%r15),%r15
  1f:	49 83 c7 40          	add    $0x40,%r15
  23:	4c 89 f8             	mov    %r15,%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 ff             	mov    %r15,%rdi
  33:	e8 1a 5d d9 fe       	call   0xfed95d52
  38:	49 8b 3f             	mov    (%r15),%rdi
  3b:	e8 02 14 af fe       	call   0xfeaf1442