Oops: general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
CPU: 0 UID: 0 PID: 382 Comm: syz.2.17 Not tainted syzkaller #0 00ad55236d4531c7fb9f608a968d4071287717d4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:d_really_is_positive include/linux/dcache.h:514 [inline]
RIP: 0010:fuse_atomic_open+0x1b6/0x440 fs/fuse/dir.c:962
Code: 8b 6d bc 44 89 ee 83 e6 40 31 ff e8 94 83 4b ff 44 89 e8 83 e0 40 75 07 e8 47 7f 4b ff eb 25 4d 8d 6e 30 4c 89 e8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ef e8 bc a6 a1 ff 49 83 7d 00 00 74 26 e8
RSP: 0018:ffffc900010ff990 EFLAGS: 00010203
RAX: 0000000000000008 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff888113fb2600 RSI: 0000000000000040 RDI: 0000000000000000
RBP: ffffc900010ff9f0 R08: ffff888113fb2600 R09: 0000000000000002
R10: 00000000fffffffe R11: 0000000000000000 R12: ffff888115931800
R13: 0000000000000047 R14: 0000000000000017 R15: ffff88811d3c4d80
FS: 00007f84e81ca6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f84e81c9f98 CR3: 000000011573c000 CR4: 00000000003526b0
Call Trace:
<TASK>
atomic_open fs/namei.c:3455 [inline]
lookup_open fs/namei.c:3566 [inline]
open_last_lookups fs/namei.c:3694 [inline]
path_openat+0x1158/0x34b0 fs/namei.c:3930
do_filp_open+0x1c6/0x3e0 fs/namei.c:3960
do_sys_openat2+0x12c/0x1c0 fs/open.c:1438
do_sys_open fs/open.c:1453 [inline]
__do_sys_creat fs/open.c:1531 [inline]
__se_sys_creat fs/open.c:1525 [inline]
__x64_sys_creat+0x92/0xc0 fs/open.c:1525
x64_sys_call+0x2710/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:86
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f84e838ebe9
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:00007f84e81ca038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f84e85b6090 RCX: 00007f84e838ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000180
RBP: 00007f84e8411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f84e85b6128 R14: 00007f84e85b6090 R15: 00007ffce2ad9f28
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:d_really_is_positive include/linux/dcache.h:514 [inline]
RIP: 0010:fuse_atomic_open+0x1b6/0x440 fs/fuse/dir.c:962
Code: 8b 6d bc 44 89 ee 83 e6 40 31 ff e8 94 83 4b ff 44 89 e8 83 e0 40 75 07 e8 47 7f 4b ff eb 25 4d 8d 6e 30 4c 89 e8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ef e8 bc a6 a1 ff 49 83 7d 00 00 74 26 e8
RSP: 0018:ffffc900010ff990 EFLAGS: 00010203
RAX: 0000000000000008 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff888113fb2600 RSI: 0000000000000040 RDI: 0000000000000000
RBP: ffffc900010ff9f0 R08: ffff888113fb2600 R09: 0000000000000002
R10: 00000000fffffffe R11: 0000000000000000 R12: ffff888115931800
R13: 0000000000000047 R14: 0000000000000017 R15: ffff88811d3c4d80
FS: 00007f84e81ca6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f84e81c9f98 CR3: 000000011573c000 CR4: 00000000003526b0
----------------
Code disassembly (best guess):
0: 8b 6d bc mov -0x44(%rbp),%ebp
3: 44 89 ee mov %r13d,%esi
6: 83 e6 40 and $0x40,%esi
9: 31 ff xor %edi,%edi
b: e8 94 83 4b ff call 0xff4b83a4
10: 44 89 e8 mov %r13d,%eax
13: 83 e0 40 and $0x40,%eax
16: 75 07 jne 0x1f
18: e8 47 7f 4b ff call 0xff4b7f64
1d: eb 25 jmp 0x44
1f: 4d 8d 6e 30 lea 0x30(%r14),%r13
23: 4c 89 e8 mov %r13,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) <-- trapping instruction
2e: 74 08 je 0x38
30: 4c 89 ef mov %r13,%rdi
33: e8 bc a6 a1 ff call 0xffa1a6f4
38: 49 83 7d 00 00 cmpq $0x0,0x0(%r13)
3d: 74 26 je 0x65
3f: e8 .byte 0xe8