kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 4246 Comm: syz-executor0 Not tainted 4.15.0-rc4-mm1+ #47
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__fire_sched_in_preempt_notifiers kernel/sched/core.c:2534 [inline]
RIP: 0010:fire_sched_in_preempt_notifiers kernel/sched/core.c:2540 [inline]
RIP: 0010:finish_task_switch+0x42d/0x740 kernel/sched/core.c:2670
RSP: 0018:ffff8801d9a4f258 EFLAGS: 00010a06
RAX: dffffc0000000000 RBX: ffff8801db32c900 RCX: 1bd5a00000000022
RDX: 0000000000000228 RSI: ffffc900018e7000 RDI: dead000000000110
RBP: ffff8801d9a4f308 R08: 1ffff1003acc2b4b R09: 0000000000000000
R10: ffff8801d9a4f230 R11: 0000000000000000 R12: ffff8801d7b8e140
R13: 1ffff1003b349e50 R14: dffffc0000000000 R15: dead000000000100
FS:  00007f64c9fa2700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd5e9db8db8 CR3: 00000001d8dae002 CR4: 00000000001626e0
DR0: 0000000020001000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 context_switch kernel/sched/core.c:2803 [inline]
 __schedule+0x8f3/0x2060 kernel/sched/core.c:3376
 schedule+0xf5/0x430 kernel/sched/core.c:3435
 freezable_schedule include/linux/freezer.h:172 [inline]
 futex_wait_queue_me+0x3ed/0x7e0 kernel/futex.c:2476
 futex_wait+0x34b/0x9a0 kernel/futex.c:2591
 do_futex+0x11ec/0x22a0 kernel/futex.c:3473
 SYSC_futex kernel/futex.c:3533 [inline]
 SyS_futex+0x260/0x390 kernel/futex.c:3501
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452a09
RSP: 002b:00007f64c9fa1ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452a09
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000071bf80
RBP: 00000000000001f1 R08: 0000000000000238 R09: 000000000071bf58
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006eff38
R13: 00000000ffffffff R14: 00007f64c9fa26d4 R15: 0000000000000007
Code: ff 11 4c 89 f9 48 c1 e9 03 42 80 3c 31 00 0f 85 1b 02 00 00 4d 8b 3f 4d 85 ff 0f 84 c0 fd ff ff 49 8d 7f 10 48 89 f9 48 c1 e9 03 <42> 80 3c 31 00 74 ae e8 17 d1 5b 00 eb a7 4c 89 fe 4c 89 e7 e8 
RIP: __fire_sched_in_preempt_notifiers kernel/sched/core.c:2534 [inline] RSP: ffff8801d9a4f258
RIP: fire_sched_in_preempt_notifiers kernel/sched/core.c:2540 [inline] RSP: ffff8801d9a4f258
RIP: finish_task_switch+0x42d/0x740 kernel/sched/core.c:2670 RSP: ffff8801d9a4f258
---[ end trace d3bb8e792be6dbb6 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..