Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 0 UID: 0 PID: 383 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:ovl_lookup_positive_unlocked fs/overlayfs/namei.c:213 [inline]
RIP: 0010:ovl_lookup_single+0x209/0xb90 fs/overlayfs/namei.c:240
Code: 4d cf a5 ff 48 89 c3 48 3d 01 f0 ff ff 72 0a e8 2d 24 40 ff e9 9a 04 00 00 49 89 dc 49 c1 ec 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 04 04 84 c0 0f 85 58 07 00 00 44 8b 33 44 89 f6 81 e6 00
RSP: 0018:ffffc9000116f900 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: 0000000000000016 RCX: f7cf6f5a8d314f00
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888121e1b698
RBP: ffffc9000116f9f0 R08: ffff888121e1b69f R09: 1ffff110243c36d3
R10: dffffc0000000000 R11: ffffed10243c36d4 R12: 0000000000000002
R13: 1ffff9200022df2c R14: ffff88811543c578 R15: ffff888112855be8
FS: 00007f5ee2cbf6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5ee2c7dd58 CR3: 000000012acd0000 CR4: 00000000003526b0
Call Trace:
<TASK>
ovl_lookup_layer+0x355/0x420 fs/overlayfs/namei.c:333
ovl_lookup+0x8d2/0x1d60 fs/overlayfs/namei.c:1124
lookup_one_qstr_excl+0x12c/0x280 fs/namei.c:1641
filename_create+0x239/0x480 fs/namei.c:4035
do_mkdirat+0xa9/0x530 fs/namei.c:4280
__do_sys_mkdirat fs/namei.c:4303 [inline]
__se_sys_mkdirat fs/namei.c:4301 [inline]
__x64_sys_mkdirat+0x8b/0xa0 fs/namei.c:4301
x64_sys_call+0x2ba8/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:259
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: 0033:0x7f5ee1d9acb9
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:00007f5ee2cbf028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f5ee2015fa0 RCX: 00007f5ee1d9acb9
RDX: 0000000000000000 RSI: 0000200000002000 RDI: ffffffffffffff9c
RBP: 00007f5ee1e08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5ee2016038 R14: 00007f5ee2015fa0 R15: 00007fff1ace0ad8
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ovl_lookup_positive_unlocked fs/overlayfs/namei.c:213 [inline]
RIP: 0010:ovl_lookup_single+0x209/0xb90 fs/overlayfs/namei.c:240
Code: 4d cf a5 ff 48 89 c3 48 3d 01 f0 ff ff 72 0a e8 2d 24 40 ff e9 9a 04 00 00 49 89 dc 49 c1 ec 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 04 04 84 c0 0f 85 58 07 00 00 44 8b 33 44 89 f6 81 e6 00
RSP: 0018:ffffc9000116f900 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: 0000000000000016 RCX: f7cf6f5a8d314f00
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888121e1b698
RBP: ffffc9000116f9f0 R08: ffff888121e1b69f R09: 1ffff110243c36d3
R10: dffffc0000000000 R11: ffffed10243c36d4 R12: 0000000000000002
R13: 1ffff9200022df2c R14: ffff88811543c578 R15: ffff888112855be8
FS: 00007f5ee2cbf6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5ee2c7dd58 CR3: 000000012acd0000 CR4: 00000000003526b0
----------------
Code disassembly (best guess):
0: 4d cf rex.WRB iretq
2: a5 movsl %ds:(%rsi),%es:(%rdi)
3: ff 48 89 decl -0x77(%rax)
6: c3 ret
7: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax
d: 72 0a jb 0x19
f: e8 2d 24 40 ff call 0xff402441
14: e9 9a 04 00 00 jmp 0x4b3
19: 49 89 dc mov %rbx,%r12
1c: 49 c1 ec 03 shr $0x3,%r12
20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
27: fc ff df
* 2a: 41 0f b6 04 04 movzbl (%r12,%rax,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 58 07 00 00 jne 0x78f
37: 44 8b 33 mov (%rbx),%r14d
3a: 44 89 f6 mov %r14d,%esi
3d: 81 .byte 0x81
3e: e6 00 out %al,$0x0