BUG: unable to handle page fault for address: ffffffffffffff6c
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 987c067 P4D 987c067 PUD 987e067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 7380 Comm: syz-executor.3 Not tainted 5.7.0-rc1-next-20200415-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__read_once_size include/linux/compiler.h:232 [inline]
RIP: 0010:wait_consider_task+0xad/0x37a0 kernel/exit.c:1259
Code: 74 04 00 00 48 89 c8 48 89 4c 24 08 48 c1 e8 03 42 0f b6 14 20 48 89 c8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 2d 1a 00 00 <44> 8b a5 74 04 00 00 bf 10 00 00 00 44 89 e6 e8 ef e7 2d 00 41 83
RSP: 0018:ffffc90006e27af8 EFLAGS: 00010246
RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffffffffffff6c
RDX: 0000000000000000 RSI: ffffffff81454e00 RDI: ffffc90006e27cf8
RBP: fffffffffffffaf8 R08: ffff888061716140 R09: fffffbfff1301219
R10: ffffffff898090c3 R11: fffffbfff1301218 R12: dffffc0000000000
R13: fffffffffffffaf8 R14: 0000000000000000 R15: ffffc90006e27cf8
FS:  0000000001c97940(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffff6c CR3: 00000000616db000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_wait_thread kernel/exit.c:1368 [inline]
 do_wait+0x442/0xa00 kernel/exit.c:1439
 kernel_wait4+0x14c/0x260 kernel/exit.c:1594
 __do_sys_wait4+0x147/0x160 kernel/exit.c:1606
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x4166ca
Code: 0f 83 6a 18 00 00 c3 66 0f 1f 84 00 00 00 00 00 8b 05 ce 1d 89 00 85 c0 75 36 45 31 d2 48 63 d2 48 63 ff b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 d4 ff ff ff f7
RSP: 002b:00007ffedd1c7ad8 EFLAGS: 00000246 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 000000000009aaf4 RCX: 00000000004166ca
RDX: 0000000040000001 RSI: 00007ffedd1c7b10 RDI: ffffffffffffffff
RBP: 0000000000001704 R08: 0000000000000001 R09: 0000000001c97940
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000c
R13: 00007ffedd1c7b10 R14: 000000000009aa55 R15: 00007ffedd1c7b20
Modules linked in:
CR2: ffffffffffffff6c
---[ end trace eee4e5a3f2d8f24e ]---
RIP: 0010:__read_once_size include/linux/compiler.h:232 [inline]
RIP: 0010:wait_consider_task+0xad/0x37a0 kernel/exit.c:1259
Code: 74 04 00 00 48 89 c8 48 89 4c 24 08 48 c1 e8 03 42 0f b6 14 20 48 89 c8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 2d 1a 00 00 <44> 8b a5 74 04 00 00 bf 10 00 00 00 44 89 e6 e8 ef e7 2d 00 41 83
RSP: 0018:ffffc90006e27af8 EFLAGS: 00010246
RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffffffffffff6c
RDX: 0000000000000000 RSI: ffffffff81454e00 RDI: ffffc90006e27cf8
RBP: fffffffffffffaf8 R08: ffff888061716140 R09: fffffbfff1301219
R10: ffffffff898090c3 R11: fffffbfff1301218 R12: dffffc0000000000
R13: fffffffffffffaf8 R14: 0000000000000000 R15: ffffc90006e27cf8
FS:  0000000001c97940(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffff6c CR3: 00000000616db000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400