BUG: unable to handle kernel paging request at fffffffffffffc46
IP: mm_update_next_owner+0x32f/0x5b0 kernel/exit.c:449
PGD 8e6b067 P4D 8e6b067 PUD 8e6d067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 22121 Comm: syz-executor.2 Not tainted 4.14.228-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88809c296300 task.stack: ffff888232788000
RIP: 0010:mm_update_next_owner+0x32f/0x5b0 kernel/exit.c:449
RSP: 0018:ffff88823278fa98 EFLAGS: 00010246
RAX: 0000000000000007 RBX: dffffc0000000000 RCX: 0000000000001872
RDX: 0000000000000000 RSI: 0000000000000100 RDI: fffffffffffffc44
RBP: 0000000000000000 R08: ffff88800013c7f0 R09: 000000000006008a
R10: ffff88809c296b88 R11: ffff88809c296300 R12: ffff8880958f2640
R13: ffff888022372790 R14: ffff88809c296300 R15: ffff888022105340
FS:  0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffc46 CR3: 000000023a9d2000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 exit_mm kernel/exit.c:547 [inline]
 do_exit+0x97c/0x2850 kernel/exit.c:855
 do_group_exit+0x100/0x2e0 kernel/exit.c:965
 get_signal+0x38d/0x1ca0 kernel/signal.c:2423
 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:792
 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x466459
RSP: 002b:00007fcf6fbf2188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffea RBX: 000000000056bf60 RCX: 0000000000466459
RDX: 000000000008c000 RSI: 00000000200008c0 RDI: ffffffffffffff9c
RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffe4655c49f R14: 00007fcf6fbf2300 R15: 0000000000022000
Code: c8 72 23 00 48 8d bd 44 fc ff ff 48 89 f8 48 c1 e8 03 0f b6 14 18 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 d5 01 00 00 <f6> 85 46 fc ff ff 20 75 87 e8 93 72 23 00 48 8d bd 20 03 00 00 
RIP: mm_update_next_owner+0x32f/0x5b0 kernel/exit.c:449 RSP: ffff88823278fa98
CR2: fffffffffffffc46
---[ end trace 56e42de7d1ca2fe6 ]---