BUG: unable to handle page fault for address: ffffffffffffff6c
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 9a7c067 P4D 9a7c067 PUD 9a7e067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 6936 Comm: syz-executor.1 Not tainted 5.8.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:wait_consider_task+0xa9/0x3b20 kernel/exit.c:1269
Code: 00 00 00 31 c0 e8 97 ea 2d 00 4c 89 f8 48 c1 e8 03 0f b6 14 28 4c 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 40 1d 00 00 <45> 8b a6 74 04 00 00 bf 10 00 00 00 44 89 e6 e8 e3 e6 2d 00 41 83
RSP: 0018:ffffc90002757b18 EFLAGS: 00010246
RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffffff81460b06
RDX: 0000000000000000 RSI: ffffffff8145ccf9 RDI: ffffc90002757d18
RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffffff89a09083
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90002757d18
R13: ffff8880619c0580 R14: fffffffffffffaf8 R15: ffffffffffffff6c
FS:  00000000017de940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffff6c CR3: 000000006197d000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_wait_thread kernel/exit.c:1378 [inline]
 do_wait+0x36a/0x9e0 kernel/exit.c:1449
 kernel_wait4+0x14c/0x260 kernel/exit.c:1621
 __do_sys_wait4+0x13f/0x150 kernel/exit.c:1633
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4169ca
Code: Bad RIP value.
RSP: 002b:00007fffbbe00648 EFLAGS: 00000246 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 00000000001b7c82 RCX: 00000000004169ca
RDX: 0000000040000001 RSI: 00007fffbbe00680 RDI: ffffffffffffffff
RBP: 0000000000001002 R08: 0000000000000001 R09: 00000000017de940
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008
R13: 00007fffbbe00680 R14: 00000000001b7bd6 R15: 00007fffbbe00690
Modules linked in:
CR2: ffffffffffffff6c
---[ end trace 6da1e810c794bf88 ]---
RIP: 0010:wait_consider_task+0xa9/0x3b20 kernel/exit.c:1269
Code: 00 00 00 31 c0 e8 97 ea 2d 00 4c 89 f8 48 c1 e8 03 0f b6 14 28 4c 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 40 1d 00 00 <45> 8b a6 74 04 00 00 bf 10 00 00 00 44 89 e6 e8 e3 e6 2d 00 41 83
RSP: 0018:ffffc90002757b18 EFLAGS: 00010246
RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffffff81460b06
RDX: 0000000000000000 RSI: ffffffff8145ccf9 RDI: ffffc90002757d18
RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffffff89a09083
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90002757d18
R13: ffff8880619c0580 R14: fffffffffffffaf8 R15: ffffffffffffff6c
FS:  00000000017de940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffff6c CR3: 000000006197d000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400