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Date: Wed, 23 Oct 2013 10:47:32 +0800
From: Michael wang <wangyun@...ux.vnet.ibm.com>
To: Fengguang Wu <fengguang.wu@...el.com>,
Peter Zijlstra <peterz@...radead.org>
CC: Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [sched] WARNING: CPU: 0 PID: 3166 at kernel/cpu.c:84 put_online_cpus()
On 10/23/2013 05:24 AM, Fengguang Wu wrote:
[snip]
>
>> @@ -3716,7 +3716,6 @@ long sched_setaffinity(pid_t pid, const struct cpumask *in_mask)
>> p = find_process_by_pid(pid);
>> if (!p) {
>> rcu_read_unlock();
>> - put_online_cpus();
>> return -ESRCH;
>
> Yes, it fixed the WARNING.
>
> Tested-by: Fengguang Wu <fengguang.wu@...el.com>
Thanks for the testing :)
>
> // The tests was queued for Michael Wang and have just finished.
>
> There seems show up a new unreliable error "BUG:kernel_test_crashed".
> I'll increase test runs to confirm whether it's a new bug.
I guess it will be a new thread when get confirmed, let's fix this easy
one firstly, will send a formal patch later.
Regards,
Michael Wang
>
> /kernel/x86_64-lkp/686c61a262ef88fdbc81c4d18bd0fcfc904d3f3e
> +----------------------------------------------------------------------------------+-----------+--------------+--------------+
> | | v3.12-rc4 | 6acce3ef8452 | 686c61a262ef |
> +----------------------------------------------------------------------------------+-----------+--------------+--------------+
> | good_boots | 539 | 0 | 16 |
> | has_kernel_error_warning | 24 | 20 | 1 |
> | INFO:task_blocked_for_more_than_seconds | 14 | | |
> | WARNING:CPU:PID:at_arch/x86/kernel/cpu/perf_event_intel.c:intel_pmu_handle_irq() | 1 | | |
> | INFO:NMI_handler(perf_event_nmi_handler)took_too_long_to_run:msecs | 1 | | |
> | XFS(vde):xlog_verify_grant_tail:space_BBTOB(tail_blocks) | 5 | | |
> | Corruption_detected.Unmount_and_run_xfs_repair | 5 | | |
> | metadata_I/O_error:block(xfs_trans_read_buf_map)error_numblks | 5 | | |
> | BUG:kernel_test_hang | 3 | | |
> | WARNING:CPU:PID:at_kernel/cpu.c:put_online_cpus() | 0 | 20 | |
> | BUG:kernel_test_crashed | 0 | 0 | 1 |
> +----------------------------------------------------------------------------------+-----------+--------------+--------------+
>
> /kernel/x86_64-lkp-CONFIG_SCHED_DEBUG/686c61a262ef88fdbc81c4d18bd0fcfc904d3f3e
>
> +------------------------------------------------------------------------------------+-----------+--------------+--------------+
> | | v3.12-rc4 | 6acce3ef8452 | 686c61a262ef |
> +------------------------------------------------------------------------------------+-----------+--------------+--------------+
> | good_boots | 39 | 0 | 16 |
> | has_kernel_error_warning | 0 | 20 | |
> | INFO:rcu_sched_self-detected_stall_on_CPU(t=jiffies_g=c=q=) | 0 | 1 | |
> | INFO:task_blocked_for_more_than_seconds | 0 | 6 | |
> | INFO:NMI_handler(arch_trigger_all_cpu_backtrace_handler)took_too_long_to_run:msecs | 0 | 3 | |
> | Kernel_panic-not_syncing:hung_task:blocked_tasks | 0 | 3 | |
> | WARNING:CPU:PID:at_kernel/cpu.c:put_online_cpus() | 0 | 12 | |
> | BUG:kernel_test_crashed | 0 | 1 | |
> +------------------------------------------------------------------------------------+-----------+--------------+--------------+
>
> /kernel/x86_64-lkp-CONFIG_SCSI_DEBUG/686c61a262ef88fdbc81c4d18bd0fcfc904d3f3e
>
> +------------------------------------------------------------------+-----------+--------------+--------------+
> | | v3.12-rc4 | 6acce3ef8452 | 686c61a262ef |
> +------------------------------------------------------------------+-----------+--------------+--------------+
> | good_boots | 38 | 1 | 17 |
> | has_kernel_error_warning | 1 | 20 | 1 |
> | Out_of_memory:Kill_process | 1 | | |
> | Kernel_panic-not_syncing:Out_of_memory_and_no_killable_processes | 1 | | |
> | BUG:kernel_test_oops | 1 | | |
> | WARNING:CPU:PID:at_kernel/cpu.c:put_online_cpus() | 0 | 20 | |
> | INFO:rcu_sched_self-detected_stall_on_CPU(t=jiffies_g=c=q=) | 0 | 0 | 1 |
> +------------------------------------------------------------------+-----------+--------------+--------------+
>
> --
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