general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 1 PID: 16215 Comm: syz-executor.4 Not tainted 6.1.25-syzkaller-00020-g7c2b6c7b56d6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023 RIP: 0010:traverse_mounts fs/namei.c:1428 [inline] RIP: 0010:handle_mounts fs/namei.c:1540 [inline] RIP: 0010:step_into+0x1c4/0x1090 fs/namei.c:1831 Code: c0 0f 85 bb 0b 00 00 44 8b 3b 43 80 3c 34 00 74 0a 48 8b 7c 24 10 e8 5b 02 f3 ff 48 8b 9c 24 d8 00 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 a8 0b 00 00 8b 1b 89 de 81 e6 00 00 07 RSP: 0018:ffffc90003f8f1c0 EFLAGS: 00010202 RAX: 0000000000000002 RBX: 0000000000000010 RCX: 0000000000040000 RDX: ffffc90003581000 RSI: 000000000000024b RDI: 000000000000024c RBP: ffffc90003f8f310 R08: ffffffff81c7fea9 R09: ffffed102c96dbcd R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff920007f1e53 R13: ffffc90003f8f440 R14: dffffc0000000000 R15: 0000000000000001 FS: 00007f560c7836c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd30350e58 CR3: 00000001333e1000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: walk_component+0x234/0x410 fs/namei.c:1999 lookup_last fs/namei.c:2450 [inline] path_lookupat+0x16d/0x450 fs/namei.c:2474 filename_lookup+0x251/0x600 fs/namei.c:2503 kern_path+0x3c/0x1a0 fs/namei.c:2593 unix_find_bsd net/unix/af_unix.c:1056 [inline] unix_find_other+0xf9/0x8e0 net/unix/af_unix.c:1117 unix_dgram_sendmsg+0xc1f/0x2050 net/unix/af_unix.c:1968 sock_sendmsg_nosec net/socket.c:716 [inline] sock_sendmsg net/socket.c:736 [inline] ____sys_sendmsg+0x5dc/0x9d0 net/socket.c:2482 ___sys_sendmsg net/socket.c:2536 [inline] __sys_sendmmsg+0x3b9/0x6f0 net/socket.c:2622 __do_sys_sendmmsg net/socket.c:2651 [inline] __se_sys_sendmmsg net/socket.c:2648 [inline] __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2648 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+0x63/0xcd RIP: 0033:0x7f560ba7cb29 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f560c7830c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f560bb9c050 RCX: 00007f560ba7cb29 RDX: 0000000000000002 RSI: 0000000020000100 RDI: 0000000000000003 RBP: 00007f560bac847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f560bb9c050 R15: 00007fffba490cc8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:traverse_mounts fs/namei.c:1428 [inline] RIP: 0010:handle_mounts fs/namei.c:1540 [inline] RIP: 0010:step_into+0x1c4/0x1090 fs/namei.c:1831 Code: c0 0f 85 bb 0b 00 00 44 8b 3b 43 80 3c 34 00 74 0a 48 8b 7c 24 10 e8 5b 02 f3 ff 48 8b 9c 24 d8 00 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 a8 0b 00 00 8b 1b 89 de 81 e6 00 00 07 RSP: 0018:ffffc90003f8f1c0 EFLAGS: 00010202 RAX: 0000000000000002 RBX: 0000000000000010 RCX: 0000000000040000 RDX: ffffc90003581000 RSI: 000000000000024b RDI: 000000000000024c RBP: ffffc90003f8f310 R08: ffffffff81c7fea9 R09: ffffed102c96dbcd R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff920007f1e53 R13: ffffc90003f8f440 R14: dffffc0000000000 R15: 0000000000000001 FS: 00007f560c7836c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555556828858 CR3: 00000001333e1000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: c0 0f 85 rorb $0x85,(%rdi) 3: bb 0b 00 00 44 mov $0x4400000b,%ebx 8: 8b 3b mov (%rbx),%edi a: 43 80 3c 34 00 cmpb $0x0,(%r12,%r14,1) f: 74 0a je 0x1b 11: 48 8b 7c 24 10 mov 0x10(%rsp),%rdi 16: e8 5b 02 f3 ff call 0xfff30276 1b: 48 8b 9c 24 d8 00 00 mov 0xd8(%rsp),%rbx 22: 00 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 a8 0b 00 00 jne 0xbdf 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)