general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 0 PID: 4276 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:208 [inline]
RIP: 0010:lmLogSync+0x241/0x9e0 fs/jfs/jfs_logmgr.c:937
Code: c1 b8 fe 4d 8d 7e f0 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 6d 86 e0 fe 4d 8b 3f 49 83 c7 30 4c 89 f8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ff e8 51 86 e0 fe 49 8b 3f e8 39 c1 b8 fe
RSP: 0018:ffffc90003ed7b60 EFLAGS: 00010206
RAX: 0000000000000006 RBX: dffffc0000000000 RCX: 54aa7a78183b7000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003ed7c80 R08: ffffc90003ed7ac7 R09: ffffc90003ed7a80
R10: dffffc0000000000 R11: fffff520007daf59 R12: ffff888058c09800
R13: ffffc90003ed7bc0 R14: ffff888029a8d838 R15: 0000000000000030
FS:  0000555593a42500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbb76143000 CR3: 000000005c2d8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 jfs_syncpt+0x77/0x90 fs/jfs/jfs_logmgr.c:1041
 jfs_sync_fs+0x83/0xa0 fs/jfs/super.c:685
 sync_filesystem+0xe6/0x220 fs/sync.c:56
 generic_shutdown_super+0x6b/0x340 fs/super.c:474
 kill_block_super+0x7c/0xe0 fs/super.c:1470
 deactivate_locked_super+0x93/0xf0 fs/super.c:332
 cleanup_mnt+0x42c/0x4b0 fs/namespace.c:1191
 task_work_run+0x1d0/0x260 kernel/task_work.c:203
 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:292 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3e7459bf17
Code: a2 c7 05 7c 96 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:00007ffdf35ae8a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f3e7460471f RCX: 00007f3e7459bf17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffdf35ae960
RBP: 00007ffdf35ae960 R08: 00007ffdf35af960 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdf35af9f0
R13: 00007f3e7460471f R14: 000000000001f9ac R15: 00007ffdf35afa30
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline]
RIP: 0010:lmLogSync+0x241/0x9e0 fs/jfs/jfs_logmgr.c:937
Code: c1 b8 fe 4d 8d 7e f0 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 6d 86 e0 fe 4d 8b 3f 49 83 c7 30 4c 89 f8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ff e8 51 86 e0 fe 49 8b 3f e8 39 c1 b8 fe
RSP: 0018:ffffc90003ed7b60 EFLAGS: 00010206
RAX: 0000000000000006 RBX: dffffc0000000000 RCX: 54aa7a78183b7000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003ed7c80 R08: ffffc90003ed7ac7 R09: ffffc90003ed7a80
R10: dffffc0000000000 R11: fffff520007daf59 R12: ffff888058c09800
R13: ffffc90003ed7bc0 R14: ffff888029a8d838 R15: 0000000000000030
FS:  0000555593a42500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e24b595620 CR3: 000000005c2d8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	c1 b8 fe 4d 8d 7e f0 	sarl   $0xf0,0x7e8d4dfe(%rax)
   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 6d 86 e0 fe       	call   0xfee08689
  1c:	4d 8b 3f             	mov    (%r15),%r15
  1f:	49 83 c7 30          	add    $0x30,%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 51 86 e0 fe       	call   0xfee08689
  38:	49 8b 3f             	mov    (%r15),%rdi
  3b:	e8 39 c1 b8 fe       	call   0xfeb8c179