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From: Ethan Zhao <ethan.zhao@oracle.com>
To: peterz@infradead.org, mingo@redhat.com, mcgrof@kernel.org,
	keescook@chromium.org
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	efault@gmx.de, james.puthukattukaran@oracle.com,
	ethan.kernel@gmail.com, Ethan Zhao <ethan.zhao@oracle.com>
Subject: [PATCH v3] sched: check user input value of sysctl_sched_time_avg
Date: Mon,  4 Sep 2017 13:59:34 +0800	[thread overview]
Message-ID: <1504504774-18253-1-git-send-email-ethan.zhao@oracle.com> (raw)

System will hang if user set sysctl_sched_time_avg to 0 by

[root@XXX ~]# sysctl kernel.sched_time_avg_ms=0

Stack traceback for pid 0
0xffff883f6406c600 0 0 1 3 R 0xffff883f6406cf50 *swapper/3
ffff883f7ccc3ae8 0000000000000018 ffffffff810c4dd0 0000000000000000
0000000000017800 ffff883f7ccc3d78 0000000000000003 ffff883f7ccc3bf8
ffffffff810c4fc9 ffff883f7ccc3c08 00000000810c5043 ffff883f7ccc3c08
Call Trace:
<IRQ> [<ffffffff810c4dd0>] ? update_group_capacity+0x110/0x200
[<ffffffff810c4fc9>] ? update_sd_lb_stats+0x109/0x600
[<ffffffff810c5507>] ? find_busiest_group+0x47/0x530
[<ffffffff810c5b84>] ? load_balance+0x194/0x900
[<ffffffff810ad5ca>] ? update_rq_clock.part.83+0x1a/0xe0
[<ffffffff810c6d42>] ? rebalance_domains+0x152/0x290
[<ffffffff810c6f5c>] ? run_rebalance_domains+0xdc/0x1d0
[<ffffffff8108a75b>] ? __do_softirq+0xfb/0x320
[<ffffffff8108ac85>] ? irq_exit+0x125/0x130
[<ffffffff810b3a17>] ? scheduler_ipi+0x97/0x160
[<ffffffff81052709>] ? smp_reschedule_interrupt+0x29/0x30
[<ffffffff8173a1be>] ? reschedule_interrupt+0x6e/0x80
 <EOI> [<ffffffff815bc83c>] ? cpuidle_enter_state+0xcc/0x230
[<ffffffff815bc80c>] ? cpuidle_enter_state+0x9c/0x230
[<ffffffff815bc9d7>] ? cpuidle_enter+0x17/0x20
[<ffffffff810cd6dc>] ? cpu_startup_entry+0x38c/0x420
[<ffffffff81053373>] ? start_secondary+0x173/0x1e0

Because divide-by-zero error happens in function

update_group_capacity()
  update_cpu_capacity()
    scale_rt_capacity()
     {
          ...
          total = sched_avg_period() + delta;
          used = div_u64(avg, total);
          ...
     }

Seems this issue could be reproduced on all I tried stable 4.1 - last
kernel.

To fix this issue, check user input value of sysctl_sched_time_avg, keep
it unchanged when hit invalid input, set the min limit of sysctl_sched_time_avg
to 1 ms.

Reported-by: James Puthukattukaran <james.puthukattukaran@oracle.com>
Signed-off-by: Ethan Zhao <ethan.zhao@oracle.com>
---
 v2: Check it at user input side in sysctl table (peterz).
 v3: Use proc_dointvec_minmax().

 kernel/sysctl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 6648fbb..423554a 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -367,7 +367,8 @@ static int sysrq_sysctl_handler(struct ctl_table *table, int write,
 		.data		= &sysctl_sched_time_avg,
 		.maxlen		= sizeof(unsigned int),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &one,
 	},
 #ifdef CONFIG_SCHEDSTATS
 	{
-- 
1.8.3.1

             reply	other threads:[~2017-09-04  6:01 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-04  5:59 Ethan Zhao [this message]
2017-09-29 20:06 ` [tip:sched/core] sched/sysctl: Check user input value of sysctl_sched_time_avg tip-bot for Ethan Zhao

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