kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 9 Comm: 
�ف����2������2� Not tainted 4.20.0-rc5-next-20181207+ #163
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__read_once_size include/linux/compiler.h:182 [inline]
RIP: 0010:get_running_cputimer include/linux/sched/cputime.h:85 [inline]
RIP: 0010:account_group_system_time include/linux/sched/cputime.h:149 [inline]
RIP: 0010:account_system_index_time+0xef/0x5d0 kernel/sched/cputime.c:168
Code: b5 04 00 00 48 8b 83 00 07 00 00 48 ba 00 00 00 00 00 fc ff df 48 8d b8 40 01 00 00 48 8d 88 28 01 00 00 48 89 fe 48 c1 ee 03 <0f> b6 14 16 48 89 fe 83 e6 07 40 38 f2 7f 08 84 d2 0f 85 01 04 00
==================================================================
RSP: 0018:ffff8881dac07950 EFLAGS: 00010006
BUG: KASAN: stack-out-of-bounds in update_curr+0x9a9/0xbd0 kernel/sched/fair.c:812
RAX: fffffffffffffff8 RBX: ffff8881d9af0240 RCX: 0000000000000120
Read of size 8 at addr ffff8881d9af0308 by task syz-executor5/31665
RDX: dffffc0000000000 RSI: 0000000000000027 RDI: 0000000000000138
RBP: ffff8881dac07a30 R08: ffff8881dac1f5f0 R09: fffffbfff12f5d44

R10: fffffbfff12c1b45 R11: ffffffff897aea23 R12: ffffffffffffffff
CPU: 1 PID: 31665 Comm: syz-executor5 Not tainted 4.20.0-rc5-next-20181207+ #163
R13: 00000000000851e0 R14: 1ffff1103b580f2d R15: ffff8881dac07a08
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
FS:  0000000000000000(0000) GS:ffff8881dac00000(0000) knlGS:0000000000000000
Call Trace:
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x244/0x39d lib/dump_stack.c:113
CR2: 0000000000a40021 CR3: 00000001bc7c3000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 print_address_description.cold.4+0x9/0x1ff mm/kasan/report.c:187
 kasan_report.cold.5+0x1b/0x39 mm/kasan/report.c:317
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135
 update_curr+0x9a9/0xbd0 kernel/sched/fair.c:812
 irqtime_account_process_tick.isra.6+0x38e/0x490 kernel/sched/cputime.c:380
 account_process_tick+0x282/0x350 kernel/sched/cputime.c:483
 update_process_times+0x21/0x70 kernel/time/timer.c:1633
 tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:161
 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1271
 __run_hrtimer kernel/time/hrtimer.c:1389 [inline]
 __hrtimer_run_queues+0x41c/0x10d0 kernel/time/hrtimer.c:1451
 enqueue_entity+0x3f5/0x20a0 kernel/sched/fair.c:3881
 hrtimer_interrupt+0x313/0x780 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1034 [inline]
 smp_apic_timer_interrupt+0x1a1/0x760 arch/x86/kernel/apic/apic.c:1059
 enqueue_task_fair+0x24d/0xa50 kernel/sched/fair.c:5116
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:804
 </IRQ>
Modules linked in:
 enqueue_task kernel/sched/core.c:730 [inline]
 activate_task+0x136/0x430 kernel/sched/core.c:751
---[ end trace 49fa7a82449290c9 ]---
 ttwu_activate kernel/sched/core.c:1643 [inline]
 ttwu_do_activate+0xd5/0x1f0 kernel/sched/core.c:1702
RIP: 0010:__read_once_size include/linux/compiler.h:182 [inline]
RIP: 0010:get_running_cputimer include/linux/sched/cputime.h:85 [inline]
RIP: 0010:account_group_system_time include/linux/sched/cputime.h:149 [inline]
RIP: 0010:account_system_index_time+0xef/0x5d0 kernel/sched/cputime.c:168
 ttwu_queue kernel/sched/core.c:1847 [inline]
 try_to_wake_up+0x9b3/0x1440 kernel/sched/core.c:2057
Code: b5 04 00 00 48 8b 83 00 07 00 00 48 ba 00 00 00 00 00 fc ff df 48 8d b8 40 01 00 00 48 8d 88 28 01 00 00 48 89 fe 48 c1 ee 03 <0f> b6 14 16 48 89 fe 83 e6 07 40 38 f2 7f 08 84 d2 0f 85 01 04 00
RSP: 0018:ffff8881dac07950 EFLAGS: 00010006
RAX: fffffffffffffff8 RBX: ffff8881d9af0240 RCX: 0000000000000120
RDX: dffffc0000000000 RSI: 0000000000000027 RDI: 0000000000000138
RBP: ffff8881dac07a30 R08: ffff8881dac1f5f0 R09: fffffbfff12f5d44
R10: fffffbfff12c1b45 R11: ffffffff897aea23 R12: ffffffffffffffff
R13: 00000000000851e0 R14: 1ffff1103b580f2d R15: ffff8881dac07a08
FS:  0000000000000000(0000) GS:ffff8881dac00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000a40021 CR3: 00000001bc7c3000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400