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: 672 Comm: syz.3.86 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:traverse_mounts fs/namei.c:1365 [inline]
RIP: 0010:handle_mounts fs/namei.c:1485 [inline]
RIP: 0010:step_into+0x12a/0xd00 fs/namei.c:1790
Code: c6 44 24 5f 00 43 0f b6 44 25 00 84 c0 48 8b 54 24 08 0f 85 59 0a 00 00 44 8b 32 4c 8b bc 24 88 00 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 5e 0a 00 00 45 8b 3f 44 89 fe 81 e6 00
RSP: 0018:ffffc90000d672e0 EFLAGS: 00010207
RAX: 0000000000000003 RBX: ffffc90000d67500 RCX: 0000000000080000
RDX: ffffc90000d67538 RSI: 0000000000000256 RDI: 0000000000000257
RBP: ffffc90000d673c8 R08: 0000000000000000 R09: 1ffff11025dee8a4
R10: dffffc0000000000 R11: ffffed1025dee8a5 R12: dffffc0000000000
R13: 1ffff920001acea7 R14: 0000000000000001 R15: 000000000000001e
FS:  00007ff02bdb96c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff02bd97ff8 CR3: 000000012fa74000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 walk_component+0x26a/0x460 fs/namei.c:1966
 lookup_last fs/namei.c:2411 [inline]
 path_lookupat+0x180/0x490 fs/namei.c:2435
 filename_lookup+0x213/0x6a0 fs/namei.c:2468
 kern_path+0x35/0x40 fs/namei.c:2555
 unix_find_other+0xe9/0x7e0 net/unix/af_unix.c:945
 unix_dgram_sendmsg+0xafc/0x17e0 net/unix/af_unix.c:1750
 sock_sendmsg_nosec net/socket.c:652 [inline]
 __sock_sendmsg net/socket.c:664 [inline]
 ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2376
 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2430
 __sys_sendmmsg+0x2ab/0x4c0 net/socket.c:2516
 __do_sys_sendmmsg net/socket.c:2545 [inline]
 __se_sys_sendmmsg net/socket.c:2542 [inline]
 __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2542
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7ff02d37f799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff02bdb9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007ff02d5f9090 RCX: 00007ff02d37f799
RDX: 0000000000000002 RSI: 00002000000001c0 RDI: 000000000000000e
RBP: 00007ff02d415c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff02d5f9128 R14: 00007ff02d5f9090 R15: 00007ffefd0ba718
Modules linked in:
---[ end trace 1319121ce3a0e5a1 ]---
RIP: 0010:traverse_mounts fs/namei.c:1365 [inline]
RIP: 0010:handle_mounts fs/namei.c:1485 [inline]
RIP: 0010:step_into+0x12a/0xd00 fs/namei.c:1790
Code: c6 44 24 5f 00 43 0f b6 44 25 00 84 c0 48 8b 54 24 08 0f 85 59 0a 00 00 44 8b 32 4c 8b bc 24 88 00 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 5e 0a 00 00 45 8b 3f 44 89 fe 81 e6 00
RSP: 0018:ffffc90000d672e0 EFLAGS: 00010207
RAX: 0000000000000003 RBX: ffffc90000d67500 RCX: 0000000000080000
RDX: ffffc90000d67538 RSI: 0000000000000256 RDI: 0000000000000257
RBP: ffffc90000d673c8 R08: 0000000000000000 R09: 1ffff11025dee8a4
R10: dffffc0000000000 R11: ffffed1025dee8a5 R12: dffffc0000000000
R13: 1ffff920001acea7 R14: 0000000000000001 R15: 000000000000001e
FS:  00007ff02bdb96c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd8c923bfa8 CR3: 000000012fa74000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	c6 44 24 5f 00       	movb   $0x0,0x5f(%rsp)
   5:	43 0f b6 44 25 00    	movzbl 0x0(%r13,%r12,1),%eax
   b:	84 c0                	test   %al,%al
   d:	48 8b 54 24 08       	mov    0x8(%rsp),%rdx
  12:	0f 85 59 0a 00 00    	jne    0xa71
  18:	44 8b 32             	mov    (%rdx),%r14d
  1b:	4c 8b bc 24 88 00 00 	mov    0x88(%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 5e 0a 00 00    	jne    0xa95
  37:	45 8b 3f             	mov    (%r15),%r15d
  3a:	44 89 fe             	mov    %r15d,%esi
  3d:	81                   	.byte 0x81
  3e:	e6 00                	out    %al,$0x0