Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 1 UID: 0 PID: 384 Comm: syz.2.17 Not tainted syzkaller #0 ad62f380a7f2f1545e15d1dbb2af73c398067985
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__d_entry_type include/linux/dcache.h:415 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:420 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:466 [inline]
RIP: 0010:d_is_positive include/linux/dcache.h:476 [inline]
RIP: 0010:filename_create+0x2b3/0x480 fs/namei.c:4041
Code: 89 de e8 60 e4 99 ff 85 db 0f 84 8d 00 00 00 e8 13 e0 99 ff 48 8b 5c 24 20 4c 8b 74 24 18 e9 a4 00 00 00 48 89 c1 48 c1 e9 03 <42> 0f b6 0c 21 84 c9 0f 85 93 01 00 00 44 8b 20 44 89 e6 81 e6 00
RSP: 0018:ffffc900011afd20 EFLAGS: 00010207
RAX: 000000000000001f RBX: 1ffff92000235fcd RCX: 0000000000000003
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff88811167ad40
RBP: ffffc900011afdf0 R08: ffff8881f6f50bc7 R09: 1ffff1103edea178
R10: dffffc0000000000 R11: ffffed103edea179 R12: dffffc0000000000
R13: ffffc900011afe68 R14: 0000000000000600 R15: 000000000000001f
FS: 00007fd029b2d6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000afe0 CR3: 0000000104700000 CR4: 00000000003526b0
Call Trace:
<TASK>
do_mknodat+0x18d/0x4f0 fs/namei.c:4180
__do_sys_mknod fs/namei.c:4226 [inline]
__se_sys_mknod fs/namei.c:4224 [inline]
__x64_sys_mknod+0x90/0xa0 fs/namei.c:4224
x64_sys_call+0x2a40/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:134
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fd028b9acb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd029b2d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007fd028e15fa0 RCX: 00007fd028b9acb9
RDX: 0000000000000704 RSI: 0000000000000200 RDI: 00002000000002c0
RBP: 00007fd028c08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd028e16038 R14: 00007fd028e15fa0 R15: 00007fff22073b88
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__d_entry_type include/linux/dcache.h:415 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:420 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:466 [inline]
RIP: 0010:d_is_positive include/linux/dcache.h:476 [inline]
RIP: 0010:filename_create+0x2b3/0x480 fs/namei.c:4041
Code: 89 de e8 60 e4 99 ff 85 db 0f 84 8d 00 00 00 e8 13 e0 99 ff 48 8b 5c 24 20 4c 8b 74 24 18 e9 a4 00 00 00 48 89 c1 48 c1 e9 03 <42> 0f b6 0c 21 84 c9 0f 85 93 01 00 00 44 8b 20 44 89 e6 81 e6 00
RSP: 0018:ffffc900011afd20 EFLAGS: 00010207
RAX: 000000000000001f RBX: 1ffff92000235fcd RCX: 0000000000000003
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff88811167ad40
RBP: ffffc900011afdf0 R08: ffff8881f6f50bc7 R09: 1ffff1103edea178
R10: dffffc0000000000 R11: ffffed103edea179 R12: dffffc0000000000
R13: ffffc900011afe68 R14: 0000000000000600 R15: 000000000000001f
FS: 00007fd029b2d6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd028be8400 CR3: 0000000104700000 CR4: 00000000003526b0
----------------
Code disassembly (best guess):
0: 89 de mov %ebx,%esi
2: e8 60 e4 99 ff call 0xff99e467
7: 85 db test %ebx,%ebx
9: 0f 84 8d 00 00 00 je 0x9c
f: e8 13 e0 99 ff call 0xff99e027
14: 48 8b 5c 24 20 mov 0x20(%rsp),%rbx
19: 4c 8b 74 24 18 mov 0x18(%rsp),%r14
1e: e9 a4 00 00 00 jmp 0xc7
23: 48 89 c1 mov %rax,%rcx
26: 48 c1 e9 03 shr $0x3,%rcx
* 2a: 42 0f b6 0c 21 movzbl (%rcx,%r12,1),%ecx <-- trapping instruction
2f: 84 c9 test %cl,%cl
31: 0f 85 93 01 00 00 jne 0x1ca
37: 44 8b 20 mov (%rax),%r12d
3a: 44 89 e6 mov %r12d,%esi
3d: 81 .byte 0x81
3e: e6 00 out %al,$0x0