syzbot

INFO: rcu_sched detected stalls on CPUs/tasks:
	(detected by 1, t=100002 jiffies, g=25699, c=25698, q=104)
All QSes seen, last rcu_sched kthread activity 100002 (4295005069-4294905067), jiffies_till_next_fqs=3, root ->qsmask 0x0
syz-executor7   R  running task    60272  8702   4580 0x00000008
Call Trace:
 <IRQ>
 sched_show_task+0x600/0x730 kernel/sched/core.c:5332
 print_other_cpu_stall kernel/rcu/tree.c:1441 [inline]
 check_cpu_stall kernel/rcu/tree.c:1559 [inline]
 __rcu_pending kernel/rcu/tree.c:3244 [inline]
 rcu_pending kernel/rcu/tree.c:3291 [inline]
 rcu_check_callbacks+0x2627/0x2990 kernel/rcu/tree.c:2646
 update_process_times+0x132/0x1a0 kernel/time/timer.c:1636
 tick_sched_handle kernel/time/tick-sched.c:164 [inline]
 tick_sched_timer+0x3a6/0x500 kernel/time/tick-sched.c:1274
 __run_hrtimer kernel/time/hrtimer.c:1398 [inline]
 __hrtimer_run_queues+0xbfc/0x15b0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0x458/0x13d0 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt+0x6b/0x250 arch/x86/kernel/apic/apic.c:1028
 smp_apic_timer_interrupt+0x5a/0x90 arch/x86/kernel/apic/apic.c:1056
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:868
 </IRQ>
RIP: 0010:__read_once_size include/linux/compiler.h:197 [inline]
RIP: 0010:csd_lock_wait kernel/smp.c:108 [inline]
RIP: 0010:smp_call_function_single+0x36b/0x4e0 kernel/smp.c:302
Code: 3a e8 59 8e 6b 00 45 85 f6 0f 84 6d ff ff ff 41 89 de eb 10 90 66 2e 0f 1f 84 00 00 00 00 00 e8 3b 32 12 00 f3 90 8b 5c 24 78 <4c> 89 e7 e8 bd 84 6b 00 8b 00 83 e0 01 83 e3 01 85 c0 74 06 f7 d0 
RSP: 0018:ffff8801ad53f920 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffffffff81535185 RBX: 0000000000000003 RCX: ffff88012e8d0000
RDX: 0000000000000000 RSI: aaaaaaaaaaaab000 RDI: ffffea000a0ff7a0
RBP: ffff8801ad53f9f8 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000000 R11: ffffffff81174df0 R12: ffff8801ad53f998
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88012e8d08f8
 task_function_call kernel/events/core.c:115 [inline]
 event_function_call+0x2cb/0x6f0 kernel/events/core.c:277
 perf_remove_from_context kernel/events/core.c:2105 [inline]
 perf_event_release_kernel+0x7d6/0x19e0 kernel/events/core.c:4560
 perf_release+0x5d/0x90 kernel/events/core.c:4647
 __fput+0x458/0xa30 fs/file_table.c:209
 ____fput+0x37/0x40 fs/file_table.c:243
 task_work_run+0x22e/0x2b0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:192 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:166 [inline]
 prepare_exit_to_usermode+0x339/0x410 arch/x86/entry/common.c:197
 syscall_return_slowpath+0xdb/0x700 arch/x86/entry/common.c:268
 do_syscall_64+0x1ab/0x220 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x410c41
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 
RSP: 002b:0000000000a3fdc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000410c41
RDX: 0000000020000050 RSI: 0000000000732b30 RDI: 0000000000000003
RBP: 0000000000000000 R08: ffffffffffffffff R09: ffffffffffffffff
R10: 0000000000a3fcf0 R11: 0000000000000293 R12: 0000000000000005
R13: 0000000000039dd8 R14: 0000000000000036 R15: badc0ffeebadface
rcu_sched kthread starved for 100002 jiffies! g25699 c25698 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0
RCU grace-period kthread stack dump:
rcu_sched       R  running task    61928    10      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2857 [inline]
 __schedule+0x667/0x770 kernel/sched/core.c:3507
 schedule+0x1bc/0x2d0 kernel/sched/core.c:3551
 schedule_timeout+0x3f0/0x580 kernel/time/timer.c:1801
 rcu_gp_kthread+0x1da1/0x3850 kernel/rcu/tree.c:2179
 kthread+0x44d/0x480 kernel/kthread.c:247
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:415