general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 PID: 3997 Comm: syz.5.977 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:traverse_mounts fs/namei.c:1386 [inline]
RIP: 0010:handle_mounts fs/namei.c:1506 [inline]
RIP: 0010:step_into+0x12e/0xd10 fs/namei.c:1814
Code: 4c 8b 74 24 18 c6 44 24 7f 00 43 0f b6 44 25 00 84 c0 0f 85 6f 0a 00 00 45 8b 36 4c 8b bc 24 a8 00 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 6e 0a 00 00 45 8b 3f 44 89 fe 81 e6 00
RSP: 0018:ffffc90000f7f2a0 EFLAGS: 00010202
RAX: 0000000000000001 RBX: ffffc90000f7f4e0 RCX: 0000000000080000
RDX: ffffc90004768000 RSI: 000000000000024f RDI: 0000000000000250
RBP: ffffc90000f7f3a8 R08: 0000000000000000 R09: ffffed10254ca375
R10: ffffed10254ca375 R11: 1ffff110254ca374 R12: dffffc0000000000
R13: 1ffff920001efea3 R14: 0000000000000001 R15: 0000000000000008
FS:  00007f77a91ed6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001644e5000 CR4: 00000000003526a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 walk_component+0x26a/0x460 fs/namei.c:1990
 lookup_last fs/namei.c:2439 [inline]
 path_lookupat+0x180/0x490 fs/namei.c:2463
 filename_lookup+0x1e2/0x4f0 fs/namei.c:2492
 kern_path+0x3d/0x1b0 fs/namei.c:2590
 unix_find_other+0xde/0x820 net/unix/af_unix.c:1021
 unix_dgram_sendmsg+0xabe/0x1880 net/unix/af_unix.c:1841
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2436
 ___sys_sendmsg+0x1f0/0x260 net/socket.c:2490
 __sys_sendmmsg+0x278/0x480 net/socket.c:2576
 __do_sys_sendmmsg net/socket.c:2605 [inline]
 __se_sys_sendmmsg net/socket.c:2602 [inline]
 __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2602
 x64_sys_call+0x6c6/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:308
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f77aa7c7749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f77a91ed038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f77aaa1e180 RCX: 00007f77aa7c7749
RDX: 0000000000000002 RSI: 00002000000001c0 RDI: 0000000000000006
RBP: 00007f77aa84bf91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f77aaa1e218 R14: 00007f77aaa1e180 R15: 00007ffc4d167a18
 </TASK>
Modules linked in:
---[ end trace 2788b0bbe39be09b ]---
RIP: 0010:traverse_mounts fs/namei.c:1386 [inline]
RIP: 0010:handle_mounts fs/namei.c:1506 [inline]
RIP: 0010:step_into+0x12e/0xd10 fs/namei.c:1814
Code: 4c 8b 74 24 18 c6 44 24 7f 00 43 0f b6 44 25 00 84 c0 0f 85 6f 0a 00 00 45 8b 36 4c 8b bc 24 a8 00 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 6e 0a 00 00 45 8b 3f 44 89 fe 81 e6 00
RSP: 0018:ffffc90000f7f2a0 EFLAGS: 00010202
RAX: 0000000000000001 RBX: ffffc90000f7f4e0 RCX: 0000000000080000
RDX: ffffc90004768000 RSI: 000000000000024f RDI: 0000000000000250
RBP: ffffc90000f7f3a8 R08: 0000000000000000 R09: ffffed10254ca375
R10: ffffed10254ca375 R11: 1ffff110254ca374 R12: dffffc0000000000
R13: 1ffff920001efea3 R14: 0000000000000001 R15: 0000000000000008
FS:  00007f77a91ed6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2c91ecffe0 CR3: 00000001644e5000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	4c 8b 74 24 18       	mov    0x18(%rsp),%r14
   5:	c6 44 24 7f 00       	movb   $0x0,0x7f(%rsp)
   a:	43 0f b6 44 25 00    	movzbl 0x0(%r13,%r12,1),%eax
  10:	84 c0                	test   %al,%al
  12:	0f 85 6f 0a 00 00    	jne    0xa87
  18:	45 8b 36             	mov    (%r14),%r14d
  1b:	4c 8b bc 24 a8 00 00 	mov    0xa8(%rsp),%r15
  22:	00
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 6e 0a 00 00    	jne    0xaa5
  37:	45 8b 3f             	mov    (%r15),%r15d
  3a:	44 89 fe             	mov    %r15d,%esi
  3d:	81                   	.byte 0x81
  3e:	e6 00                	out    %al,$0x0