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: 1 PID: 7337 Comm: syz-executor.4 Not tainted 5.8.0-rc2-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 57 e8 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 a3 e4 2d 00 41 83
RSP: 0018:ffffc90005f77b18 EFLAGS: 00010246
RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffffff8145a6a6
RDX: 0000000000000000 RSI: ffffffff81456899 RDI: ffffc90005f77d18
RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffffff89a09083
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90005f77d18
R13: ffff888054b06340 R14: fffffffffffffaf8 R15: ffffffffffffff6c
FS:  00000000014b0940(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffff6c CR3: 0000000056a6a000 CR4: 00000000001426e0
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:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4169ba
Code: Bad RIP value.
RSP: 002b:0000000000c9fda8 EFLAGS: 00000246 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 0000000000099c81 RCX: 00000000004169ba
RDX: 0000000040000001 RSI: 0000000000c9fde0 RDI: ffffffffffffffff
RBP: 0000000000000469 R08: 0000000000000001 R09: 00000000014b0940
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000f
R13: 0000000000c9fde0 R14: 0000000000099814 R15: 0000000000c9fdf0
Modules linked in:
CR2: ffffffffffffff6c
---[ end trace 28a5c75e094a5777 ]---
RIP: 0010:wait_consider_task+0xa9/0x3b20 kernel/exit.c:1269
Code: 00 00 00 31 c0 e8 57 e8 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 a3 e4 2d 00 41 83
RSP: 0018:ffffc90005f77b18 EFLAGS: 00010246
RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffffff8145a6a6
RDX: 0000000000000000 RSI: ffffffff81456899 RDI: ffffc90005f77d18
RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffffff89a09083
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90005f77d18
R13: ffff888054b06340 R14: fffffffffffffaf8 R15: ffffffffffffff6c
FS:  00000000014b0940(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffff6c CR3: 0000000056a6a000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400