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: 3637 Comm: udevd Tainted: G W 5.17.0-syzkaller-11138-gf022814633e1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:list_add_tail include/linux/list.h:102 [inline] RIP: 0010:list_lru_add+0x277/0x510 mm/list_lru.c:129 Code: 04 64 4d 8d 7c c7 10 4c 89 3c 24 e8 a3 a6 ca ff 49 8d 47 08 48 89 c2 48 89 44 24 10 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 4d 02 00 00 4d 8b 77 08 48 89 df 48 8b 14 24 4c RSP: 0018:ffffc9000332f9d0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff88823bdf6fc0 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffffff81ad8bad RDI: ffffffff8db5fd10 RBP: ffff88807fbe47f0 R08: 0000000000000000 R09: ffffffff8db5fd17 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: ffff88807f943080 R14: 0000000000000080 R15: 0000000000000000 FS: 00007f7aa4bdf840(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe036ea5fc8 CR3: 000000005b59a000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: d_lru_add fs/dcache.c:431 [inline] retain_dentry fs/dcache.c:685 [inline] dput+0x7a7/0xdb0 fs/dcache.c:908 handle_mounts fs/namei.c:1552 [inline] step_into+0xcb3/0x1d80 fs/namei.c:1850 walk_component+0x171/0x6a0 fs/namei.c:2026 lookup_last fs/namei.c:2475 [inline] path_lookupat+0x1bb/0x860 fs/namei.c:2499 filename_lookup+0x1c6/0x590 fs/namei.c:2528 user_path_at_empty+0x42/0x60 fs/namei.c:2851 user_path_at include/linux/namei.h:57 [inline] do_faccessat+0x127/0x850 fs/open.c:422 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f7aa4d25bcd Code: 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 41 55 41 89 ca 41 89 cd b8 b7 01 00 00 41 54 41 89 d4 55 53 48 81 ec 98 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 27 01 00 00 41 89 c0 85 c0 0f 84 f4 00 00 RSP: 002b:00007ffcc8e48480 EFLAGS: 00000202 ORIG_RAX: 00000000000001b7 RAX: ffffffffffffffda RBX: 00007ffcc8e49610 RCX: 00007f7aa4d25bcd RDX: 0000000000000000 RSI: 00007f7aa5125970 RDI: 000000000000000b RBP: 0000562d4d524eb0 R08: 0000562d4d4ee5a0 R09: 0000562d4d4c0010 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:list_add_tail include/linux/list.h:102 [inline] RIP: 0010:list_lru_add+0x277/0x510 mm/list_lru.c:129 Code: 04 64 4d 8d 7c c7 10 4c 89 3c 24 e8 a3 a6 ca ff 49 8d 47 08 48 89 c2 48 89 44 24 10 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 4d 02 00 00 4d 8b 77 08 48 89 df 48 8b 14 24 4c RSP: 0018:ffffc9000332f9d0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff88823bdf6fc0 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffffff81ad8bad RDI: ffffffff8db5fd10 RBP: ffff88807fbe47f0 R08: 0000000000000000 R09: ffffffff8db5fd17 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: ffff88807f943080 R14: 0000000000000080 R15: 0000000000000000 FS: 00007f7aa4bdf840(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe036ea5fc8 CR3: 000000005b59a000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 04 64 add $0x64,%al 2: 4d 8d 7c c7 10 lea 0x10(%r15,%rax,8),%r15 7: 4c 89 3c 24 mov %r15,(%rsp) b: e8 a3 a6 ca ff callq 0xffcaa6b3 10: 49 8d 47 08 lea 0x8(%r15),%rax 14: 48 89 c2 mov %rax,%rdx 17: 48 89 44 24 10 mov %rax,0x10(%rsp) 1c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 23: fc ff df 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 4d 02 00 00 jne 0x281 34: 4d 8b 77 08 mov 0x8(%r15),%r14 38: 48 89 df mov %rbx,%rdi 3b: 48 8b 14 24 mov (%rsp),%rdx 3f: 4c rex.WR