Oops: general protection fault, probably for non-canonical address 0xdffffc000000001b: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000000d8-0x00000000000000df]
CPU: 0 UID: 0 PID: 5730 Comm: syz.0.6 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:keyctl_session_to_parent+0x825/0xa30
Code: 35 3b fd e9 fe fa ff ff e8 38 35 3b fd e9 f4 fa ff ff e8 2e 35 3b fd 48 8b 54 24 20 48 81 c2 d8 00 00 00 48 89 d0 48 c1 e8 03 <0f> b6 04 18 84 c0 0f 85 b2 01 00 00 8b 2a 89 ef 8b 5c 24 1c 89 de
RSP: 0018:ffffc9000621fc70 EFLAGS: 00010006
RAX: 000000000000001b RBX: dffffc0000000000 RCX: ffff88810b603c00
RDX: 00000000000000d8 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000c43f7c R12: ffff88811a010000
R13: 0000000000000000 R14: ffff88810c2631a8 R15: 0000000000000000
FS:  00007f7f2068b6c0(0000) GS:ffff88818c4bf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7f2068aff8 CR3: 000000010cae8000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __se_sys_keyctl+0x780/0x9d0
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7f1f79f559
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:00007f7f2068b028 EFLAGS: 00000246 ORIG_RAX: 00000000000000fa
RAX: ffffffffffffffda RBX: 00007f7f1fa26270 RCX: 00007f7f1f79f559
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000012
RBP: 00007f7f1f836b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7f1fa26308 R14: 00007f7f1fa26270 R15: 00007ffe789f59b8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:keyctl_session_to_parent+0x825/0xa30
Code: 35 3b fd e9 fe fa ff ff e8 38 35 3b fd e9 f4 fa ff ff e8 2e 35 3b fd 48 8b 54 24 20 48 81 c2 d8 00 00 00 48 89 d0 48 c1 e8 03 <0f> b6 04 18 84 c0 0f 85 b2 01 00 00 8b 2a 89 ef 8b 5c 24 1c 89 de
RSP: 0018:ffffc9000621fc70 EFLAGS: 00010006
RAX: 000000000000001b RBX: dffffc0000000000 RCX: ffff88810b603c00
RDX: 00000000000000d8 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000c43f7c R12: ffff88811a010000
R13: 0000000000000000 R14: ffff88810c2631a8 R15: 0000000000000000
FS:  00007f7f2068b6c0(0000) GS:ffff88818c4bf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7f2068aff8 CR3: 000000010cae8000 CR4: 00000000000006f0