general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 0 PID: 313 Comm: syz-executor156 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__is_local_mountpoint+0x56/0x1a0 fs/namespace.c:749
Code: 49 81 c6 48 08 00 00 4c 89 f0 48 c1 e8 03 80 3c 18 00 74 08 4c 89 f7 e8 98 3f ef ff 4d 8b 36 49 83 c6 18 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 7c 3f ef ff 4d 8b 3e 48 c7 c7 20 90
RSP: 0018:ffffc90000e87738 EFLAGS: 00010206
RAX: 0000000000000003 RBX: dffffc0000000000 RCX: ffff888110872880
RDX: 0000000000000000 RSI: 0000000000010000 RDI: ffff88810c3b9bb0
RBP: ffffc90000e87770 R08: ffff8881004a9eaf R09: 1ffff110200953d5
R10: dffffc0000000000 R11: ffffed10200953d6 R12: 1ffff110231a747b
R13: 0000000000010000 R14: 0000000000000018 R15: 1ffff11021877376
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001000 CR3: 00000001104ab000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 is_local_mountpoint fs/mount.h:141 [inline]
 vfs_rmdir+0x12d/0x4f0 fs/namei.c:4190
 incfs_kill_sb+0xfe/0x210 fs/incfs/vfs.c:1995
 deactivate_locked_super+0xb5/0x120 fs/super.c:336
 deactivate_super+0xaf/0xe0 fs/super.c:367
 cleanup_mnt+0x45e/0x4e0 fs/namespace.c:1192
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1199
 task_work_run+0x1e1/0x250 kernel/task_work.c:203
 exit_task_work include/linux/task_work.h:39 [inline]
 do_exit+0xaf2/0x2850 kernel/exit.c:887
 do_group_exit+0x21b/0x2e0 kernel/exit.c:1030
 get_signal+0x167c/0x1700 kernel/signal.c:2895
 arch_do_signal_or_restart+0xd1/0x11c0 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x7a/0xb0 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f2c56291839
Code: Unable to access opcode bytes at 0x7f2c5629180f.
RSP: 002b:00007f2c56266218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f2c56338e28 RCX: 00007f2c56291839
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f2c56338e28
RBP: 00007f2c56338e20 R08: 33203a6b63617473 R09: 33203a6b63617473
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2c5630995c
R13: 0000200000000b80 R14: 0000200000000040 R15: 0030656c69662f2e
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__is_local_mountpoint+0x56/0x1a0 fs/namespace.c:749
Code: 49 81 c6 48 08 00 00 4c 89 f0 48 c1 e8 03 80 3c 18 00 74 08 4c 89 f7 e8 98 3f ef ff 4d 8b 36 49 83 c6 18 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 7c 3f ef ff 4d 8b 3e 48 c7 c7 20 90
RSP: 0018:ffffc90000e87738 EFLAGS: 00010206
RAX: 0000000000000003 RBX: dffffc0000000000 RCX: ffff888110872880
RDX: 0000000000000000 RSI: 0000000000010000 RDI: ffff88810c3b9bb0
RBP: ffffc90000e87770 R08: ffff8881004a9eaf R09: 1ffff110200953d5
R10: dffffc0000000000 R11: ffffed10200953d6 R12: 1ffff110231a747b
R13: 0000000000010000 R14: 0000000000000018 R15: 1ffff11021877376
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2c56265bb0 CR3: 0000000123bb6000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	49 81 c6 48 08 00 00 	add    $0x848,%r14
   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 98 3f ef ff       	call   0xffef3fb4
  1c:	4d 8b 36             	mov    (%r14),%r14
  1f:	49 83 c6 18          	add    $0x18,%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 7c 3f ef ff       	call   0xffef3fb4
  38:	4d 8b 3e             	mov    (%r14),%r15
  3b:	48                   	rex.W
  3c:	c7                   	.byte 0xc7
  3d:	c7                   	(bad)
  3e:	20                   	.byte 0x20
  3f:	90                   	nop