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: 13366 Comm: syz.6.3471 Tainted: G W 5.15.182-syzkaller-00462-g57725b368731 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 RIP: 0010:traverse_mounts fs/namei.c:1378 [inline] RIP: 0010:handle_mounts fs/namei.c:1498 [inline] RIP: 0010:step_into+0x12e/0xd10 fs/namei.c:1806 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:ffffc90000a77a80 EFLAGS: 00010203 RAX: 0000000000000001 RBX: ffffc90000a77cc0 RCX: 0000000000080000 RDX: ffffc9000ac61000 RSI: 000000000000023c RDI: 000000000000023d RBP: ffffc90000a77b88 R08: 0000000000000000 R09: ffffed1026965f65 R10: ffffed1026965f65 R11: 1ffff11026965f64 R12: dffffc0000000000 R13: 1ffff9200014ef9f R14: 0000000000000000 R15: 000000000000000e FS: 00007f9370dc06c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9370dbff98 CR3: 000000011d3da000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: walk_component+0x26a/0x460 fs/namei.c:1982 lookup_last fs/namei.c:2431 [inline] path_lookupat+0x180/0x490 fs/namei.c:2455 filename_lookup+0x1e2/0x4f0 fs/namei.c:2484 do_linkat+0xed/0x730 fs/namei.c:4608 __do_sys_link fs/namei.c:4662 [inline] __se_sys_link fs/namei.c:4660 [inline] __x64_sys_link+0x86/0x90 fs/namei.c:4660 x64_sys_call+0x34d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:87 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: 0033:0x7f9372799969 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:00007f9370dc0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000056 RAX: ffffffffffffffda RBX: 00007f93729c1160 RCX: 00007f9372799969 RDX: 0000000000000000 RSI: 0000200000000400 RDI: 0000200000000280 RBP: 00007f937281bab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f93729c1160 R15: 00007ffc177f0278 Modules linked in: ---[ end trace aac8a7e198309a93 ]--- RIP: 0010:traverse_mounts fs/namei.c:1378 [inline] RIP: 0010:handle_mounts fs/namei.c:1498 [inline] RIP: 0010:step_into+0x12e/0xd10 fs/namei.c:1806 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:ffffc90000a77a80 EFLAGS: 00010203 RAX: 0000000000000001 RBX: ffffc90000a77cc0 RCX: 0000000000080000 RDX: ffffc9000ac61000 RSI: 000000000000023c RDI: 000000000000023d RBP: ffffc90000a77b88 R08: 0000000000000000 R09: ffffed1026965f65 R10: ffffed1026965f65 R11: 1ffff11026965f64 R12: dffffc0000000000 R13: 1ffff9200014ef9f R14: 0000000000000000 R15: 000000000000000e FS: 00007f9370dc06c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000011d3da000 CR4: 00000000003506a0 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