general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 0 PID: 29451 Comm: syz-executor.3 Tainted: G W 5.10.209-syzkaller-00001-ge7daca75b4c3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:d_really_is_positive include/linux/dcache.h:499 [inline] RIP: 0010:fuse_atomic_open+0x27f/0x34e0 fs/fuse/dir.c:849 Code: e0 40 4c 8b 64 24 20 75 07 e8 1d b3 6c ff eb 37 48 8b 44 24 60 48 8d 58 30 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 f3 2b aa ff 48 83 3b 00 0f 84 a9 00 RSP: 0018:ffffc90000fcf2e0 EFLAGS: 00010207 RAX: 0000000000000006 RBX: 0000000000000037 RCX: dffffc0000000000 RDX: ffff8881133f62c0 RSI: 0000000000000040 RDI: 0000000000000000 RBP: ffffc90000fcf910 R08: ffffffff81fdf4c2 R09: ffffed102593d33c R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88812c9e96a8 R13: ffff888127f38000 R14: 1ffff920001f9e74 R15: 0000000000000007 FS: 00007fd37a7636c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020010000 CR3: 0000000113e62000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: atomic_open fs/namei.c:3120 [inline] lookup_open fs/namei.c:3225 [inline] open_last_lookups fs/namei.c:3323 [inline] path_openat+0xff0/0x3000 fs/namei.c:3512 do_filp_open+0x21c/0x460 fs/namei.c:3542 do_sys_openat2+0x13f/0x6f0 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: 0033:0x7fd37ba10e69 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:00007fd37a7630c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fd37bb3f050 RCX: 00007fd37ba10e69 RDX: 000000000000275a RSI: 0000000020000100 RDI: ffffffffffffff9c RBP: 00007fd37ba5d47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007fd37bb3f050 R15: 00007ffeb7f4bcf8 Modules linked in: ---[ end trace 434f0ad5a6f0b66d ]--- RIP: 0010:d_really_is_positive include/linux/dcache.h:499 [inline] RIP: 0010:fuse_atomic_open+0x27f/0x34e0 fs/fuse/dir.c:849 Code: e0 40 4c 8b 64 24 20 75 07 e8 1d b3 6c ff eb 37 48 8b 44 24 60 48 8d 58 30 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 f3 2b aa ff 48 83 3b 00 0f 84 a9 00 RSP: 0018:ffffc90000fcf2e0 EFLAGS: 00010207 RAX: 0000000000000006 RBX: 0000000000000037 RCX: dffffc0000000000 RDX: ffff8881133f62c0 RSI: 0000000000000040 RDI: 0000000000000000 RBP: ffffc90000fcf910 R08: ffffffff81fdf4c2 R09: ffffed102593d33c R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88812c9e96a8 R13: ffff888127f38000 R14: 1ffff920001f9e74 R15: 0000000000000007 FS: 00007fd37a7636c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200000c0 CR3: 0000000113e62000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: e0 40 loopne 0x42 2: 4c 8b 64 24 20 mov 0x20(%rsp),%r12 7: 75 07 jne 0x10 9: e8 1d b3 6c ff call 0xff6cb32b e: eb 37 jmp 0x47 10: 48 8b 44 24 60 mov 0x60(%rsp),%rax 15: 48 8d 58 30 lea 0x30(%rax),%rbx 19: 48 89 d8 mov %rbx,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 48 89 df mov %rbx,%rdi 33: e8 f3 2b aa ff call 0xffaa2c2b 38: 48 83 3b 00 cmpq $0x0,(%rbx) 3c: 0f .byte 0xf 3d: 84 .byte 0x84 3e: a9 .byte 0xa9