general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 PID: 289 Comm: syz-executor241 Not tainted 5.10.178-syzkaller-00127-g43c801dc3325 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 RIP: 0010:__d_entry_type include/linux/dcache.h:400 [inline] RIP: 0010:d_is_miss include/linux/dcache.h:405 [inline] RIP: 0010:d_is_negative include/linux/dcache.h:451 [inline] RIP: 0010:atomic_open fs/namei.c:3136 [inline] RIP: 0010:lookup_open fs/namei.c:3225 [inline] RIP: 0010:open_last_lookups fs/namei.c:3323 [inline] RIP: 0010:path_openat+0x17ab/0x3000 fs/namei.c:3512 Code: b6 04 30 84 c0 0f 85 d9 07 00 00 48 8b 44 24 30 80 60 01 f8 e9 69 ee ff ff e8 c1 74 b7 ff 4c 8b 64 24 20 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 8f 07 00 00 41 8b 1f be 00 00 70 00 21 RSP: 0018:ffffc90000b17920 EFLAGS: 00010247 RAX: 0000000000000000 RBX: ffff88811ec4fb18 RCX: ffff88811edb2780 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000000 RBP: ffffc90000b17b50 R08: ffffffff81b5b6db R09: ffffed1023880a50 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88811c405250 R13: 0000000000008000 R14: dffffc0000000000 R15: 0000000000000004 FS: 00007fd2db5b3700(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd2db5b3718 CR3: 000000011ec09000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: do_filp_open+0x21c/0x460 fs/namei.c:3542 do_sys_openat2+0x13f/0x6e0 fs/open.c:1217 do_sys_open fs/open.c:1233 [inline] __do_sys_openat fs/open.c:1249 [inline] __se_sys_openat fs/open.c:1244 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1244 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7fd2db622469 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 14 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd2db5b32f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fd2db6ac4d0 RCX: 00007fd2db622469 RDX: 0000000000000000 RSI: 0000000020000040 RDI: ffffffffffffff9c RBP: 00007fd2db67a01c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffdd3cd35e R13: 00007fd2db67a038 R14: 2f30656c69662f2e R15: 00007fd2db6ac4d8 Modules linked in: ---[ end trace 1893fe57b880c2fd ]--- RIP: 0010:__d_entry_type include/linux/dcache.h:400 [inline] RIP: 0010:d_is_miss include/linux/dcache.h:405 [inline] RIP: 0010:d_is_negative include/linux/dcache.h:451 [inline] RIP: 0010:atomic_open fs/namei.c:3136 [inline] RIP: 0010:lookup_open fs/namei.c:3225 [inline] RIP: 0010:open_last_lookups fs/namei.c:3323 [inline] RIP: 0010:path_openat+0x17ab/0x3000 fs/namei.c:3512 Code: b6 04 30 84 c0 0f 85 d9 07 00 00 48 8b 44 24 30 80 60 01 f8 e9 69 ee ff ff e8 c1 74 b7 ff 4c 8b 64 24 20 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 8f 07 00 00 41 8b 1f be 00 00 70 00 21 RSP: 0018:ffffc90000b17920 EFLAGS: 00010247 RAX: 0000000000000000 RBX: ffff88811ec4fb18 RCX: ffff88811edb2780 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000000 RBP: ffffc90000b17b50 R08: ffffffff81b5b6db R09: ffffed1023880a50 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88811c405250 R13: 0000000000008000 R14: dffffc0000000000 R15: 0000000000000004 FS: 00007fd2db5b3700(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f24ae567ae0 CR3: 000000011ec09000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: b6 04 mov $0x4,%dh 2: 30 84 c0 0f 85 d9 07 xor %al,0x7d9850f(%rax,%rax,8) 9: 00 00 add %al,(%rax) b: 48 8b 44 24 30 mov 0x30(%rsp),%rax 10: 80 60 01 f8 andb $0xf8,0x1(%rax) 14: e9 69 ee ff ff jmpq 0xffffee82 19: e8 c1 74 b7 ff callq 0xffb774df 1e: 4c 8b 64 24 20 mov 0x20(%rsp),%r12 23: 4c 89 f8 mov %r15,%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 8f 07 00 00 jne 0x7c6 37: 41 8b 1f mov (%r15),%ebx 3a: be 00 00 70 00 mov $0x700000,%esi 3f: 21 .byte 0x21