Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 0 UID: 0 PID: 8059 Comm: syz.6.265 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:attach_mnt+0x32/0x400
Code: 54 53 48 83 ec 18 49 89 d4 49 89 f5 48 89 fb 48 bd 00 00 00 00 00 fc ff df e8 ba b6 79 ff 4d 8d 7c 24 10 4c 89 f8 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 ff e8 d0 f8 e3 ff 4d 8b 37 4c 8d 7b 18 4c
RSP: 0018:ffffc9000612fc28 EFLAGS: 00010202
RAX: 0000000000000002 RBX: ffff888117646a00 RCX: 0000000000080000
RDX: ffffc90008951000 RSI: 0000000000000317 RDI: 0000000000000318
RBP: dffffc0000000000 R08: ffffffff824d87de R09: ffffffff8e416948
R10: dffffc0000000000 R11: fffff52000c25f80 R12: 0000000000000000
R13: ffff888117647800 R14: ffffffff824d87de R15: 0000000000000010
FS:  00007f891a3f66c0(0000) GS:ffff88818de5d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002040 CR3: 000000016fd1a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 copy_tree+0x4b7/0x930
 open_detached_copy+0x21e/0x660
 vfs_open_tree+0x484/0xfc0
 __x64_sys_open_tree+0x96/0x110
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f891959c799
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:00007f891a3f6028 EFLAGS: 00000246 ORIG_RAX: 00000000000001ac
RAX: ffffffffffffffda RBX: 00007f8919815fa0 RCX: 00007f891959c799
RDX: 0000000000089901 RSI: 0000200000000540 RDI: ffffffffffffff9c
RBP: 00007f8919632c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8919816038 R14: 00007f8919815fa0 R15: 00007ffcc566efd8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:attach_mnt+0x32/0x400
Code: 54 53 48 83 ec 18 49 89 d4 49 89 f5 48 89 fb 48 bd 00 00 00 00 00 fc ff df e8 ba b6 79 ff 4d 8d 7c 24 10 4c 89 f8 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 ff e8 d0 f8 e3 ff 4d 8b 37 4c 8d 7b 18 4c
RSP: 0018:ffffc9000612fc28 EFLAGS: 00010202
RAX: 0000000000000002 RBX: ffff888117646a00 RCX: 0000000000080000
RDX: ffffc90008951000 RSI: 0000000000000317 RDI: 0000000000000318
RBP: dffffc0000000000 R08: ffffffff824d87de R09: ffffffff8e416948
R10: dffffc0000000000 R11: fffff52000c25f80 R12: 0000000000000000
R13: ffff888117647800 R14: ffffffff824d87de R15: 0000000000000010
FS:  00007f891a3f66c0(0000) GS:ffff88818de5d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002040 CR3: 000000016fd1a000 CR4: 00000000000006f0
