loop2: detected capacity change from 0 to 512
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 11659 Comm: syz-executor.2 Not tainted 5.15.98-syzkaller-00348-g7364b7abbafb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
RIP: 0010:traverse_mounts fs/namei.c:1376 [inline]
RIP: 0010:handle_mounts fs/namei.c:1496 [inline]
RIP: 0010:step_into+0x1b6/0xe70 fs/namei.c:1802
Code: 20 0f 85 99 0a 00 00 44 8b 3b 43 80 3c 2c 00 74 0a 48 8b 7c 24 18 e8 99 d1 f3 ff 48 8b 9c 24 b8 00 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 86 0a 00 00 8b 1b 89 de 81 e6 00 00 07
RSP: 0018:ffffc9000810f860 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000008 RCX: ffff88810c5d2780
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000810f990 R08: ffffffff81bcc0b0 R09: ffffed10238c0815
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92001021f23
R13: dffffc0000000000 R14: ffffc9000810fcc0 R15: 0000000000000091
FS:  00007f9092c3d700(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020004200 CR3: 0000000114fda000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 walk_component+0x359/0x610 fs/namei.c:1978
 link_path_walk+0x642/0xd90
 path_lookupat+0xa0/0x450 fs/namei.c:2450
 filename_lookup+0x230/0x5c0 fs/namei.c:2480
 user_path_at_empty+0x43/0x1a0 fs/namei.c:2853
 user_path_at include/linux/namei.h:57 [inline]
 ksys_umount fs/namespace.c:1779 [inline]
 __do_sys_umount fs/namespace.c:1787 [inline]
 __se_sys_umount fs/namespace.c:1785 [inline]
 __x64_sys_umount+0xf0/0x170 fs/namespace.c:1785
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f9093eca169
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9092c3d168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00007f9093fe9f80 RCX: 00007f9093eca169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000180
RBP: 00007f9093f25ca1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff60dd301f R14: 00007f9092c3d300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace a8d35edaf3fcea7a ]---
RIP: 0010:traverse_mounts fs/namei.c:1376 [inline]
RIP: 0010:handle_mounts fs/namei.c:1496 [inline]
RIP: 0010:step_into+0x1b6/0xe70 fs/namei.c:1802
Code: 20 0f 85 99 0a 00 00 44 8b 3b 43 80 3c 2c 00 74 0a 48 8b 7c 24 18 e8 99 d1 f3 ff 48 8b 9c 24 b8 00 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 86 0a 00 00 8b 1b 89 de 81 e6 00 00 07
RSP: 0018:ffffc9000810f860 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000008 RCX: ffff88810c5d2780
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000810f990 R08: ffffffff81bcc0b0 R09: ffffed10238c0815
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92001021f23
R13: dffffc0000000000 R14: ffffc9000810fcc0 R15: 0000000000000091
FS:  00007f9092c3d700(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020008000 CR3: 0000000114fda000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	20 0f                	and    %cl,(%rdi)
   2:	85 99 0a 00 00 44    	test   %ebx,0x4400000a(%rcx)
   8:	8b 3b                	mov    (%rbx),%edi
   a:	43 80 3c 2c 00       	cmpb   $0x0,(%r12,%r13,1)
   f:	74 0a                	je     0x1b
  11:	48 8b 7c 24 18       	mov    0x18(%rsp),%rdi
  16:	e8 99 d1 f3 ff       	callq  0xfff3d1b4
  1b:	48 8b 9c 24 b8 00 00 	mov    0xb8(%rsp),%rbx
  22:	00
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 86 0a 00 00    	jne    0xabd
  37:	8b 1b                	mov    (%rbx),%ebx
  39:	89 de                	mov    %ebx,%esi
  3b:	81                   	.byte 0x81
  3c:	e6 00                	out    %al,$0x0
  3e:	00 07                	add    %al,(%rdi)