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: 5768 Comm: syz-executor Not tainted syzkaller #0
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:lmLogSync+0x245/0x9f0 fs/jfs/jfs_logmgr.c:937
Code: fd ae fe 4d 8d 7e f0 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 39 4d 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 1d 4d d9 fe 49 8b 3f e8 85 fd ae fe
RSP: 0018:ffffc900045efb80 EFLAGS: 00010202
RAX: 0000000000000008 RBX: dffffc0000000000 RCX: afa04472937cde00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900045efc88 R08: ffffc900045efae7 R09: 0000000000000000
R10: ffffc900045efaa0 R11: fffff520008bdf5d R12: ffff8880210e0800
R13: ffffc900045efbe0 R14: ffff88807d78e638 R15: 0000000000000040
FS:  0000555574b82500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f15663ab000 CR3: 0000000064101000 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: 0033:0x7f72c539d9d7
Code: a2 c7 05 1c fd 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:00007fff3a3ecf18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f72c5432050 RCX: 00007f72c539d9d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff3a3ecfd0
RBP: 00007fff3a3ecfd0 R08: 00007fff3a3edfd0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff3a3ee060
R13: 00007f72c5432050 R14: 0000000000029b7f R15: 00007fff3a3ee0a0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline]
RIP: 0010:lmLogSync+0x245/0x9f0 fs/jfs/jfs_logmgr.c:937
Code: fd ae fe 4d 8d 7e f0 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 39 4d 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 1d 4d d9 fe 49 8b 3f e8 85 fd ae fe
RSP: 0018:ffffc900045efb80 EFLAGS: 00010202
RAX: 0000000000000008 RBX: dffffc0000000000 RCX: afa04472937cde00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900045efc88 R08: ffffc900045efae7 R09: 0000000000000000
R10: ffffc900045efaa0 R11: fffff520008bdf5d R12: ffff8880210e0800
R13: ffffc900045efbe0 R14: ffff88807d78e638 R15: 0000000000000040
FS:  0000555574b82500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555fbd8a28 CR3: 0000000064101000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
   0:	fd                   	std
   1:	ae                   	scas   %es:(%rdi),%al
   2:	fe 4d 8d             	decb   -0x73(%rbp)
   5:	7e f0                	jle    0xfffffff7
   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 39 4d d9 fe       	call   0xfed94d55
  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 1d 4d d9 fe       	call   0xfed94d55
  38:	49 8b 3f             	mov    (%r15),%rdi
  3b:	e8 85 fd ae fe       	call   0xfeaefdc5