linux-kernel - Re: [percpu] BUG: using __this_cpu_add() in preemptible [00000000] code: init/1

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 7 Mar 2014 11:25:16 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Fengguang Wu <fengguang.wu@...el.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [percpu]  BUG: using __this_cpu_add() in preemptible [00000000]
 code: init/1

On Fri, 7 Mar 2014, Fengguang Wu wrote:

> Christoph,
>
> FYI, here is another bisect result and call trace. Interestingly, next-20140307
> no longer triggers this BUG message.
>
> commit a25982c15ae5298520033cd5848a82adf6a97376
> Author:     Christoph Lameter <cl@...ux.com>
> AuthorDate: Thu Mar 6 11:05:21 2014 +1100

kvm_clock_read() disables preemption so this should not trigger. And it
seems to work around having to use this cpu ops.

static cycle_t kvm_clock_read(void)
{
        struct pvclock_vcpu_time_info *src;
        cycle_t ret;
        int cpu;

        preempt_disable_notrace();
        cpu = smp_processor_id();
        src = &hv_clock[cpu].pvti;
        ret = pvclock_clocksource_read(src);
        preempt_enable_notrace();
        return ret;
}

Content of type "TEXT/PLAIN" skipped

Content of type "APPLICATION/OCTET-STREAM" skipped

View attachment "config-3.14.0-rc5-next-20140306-07138-g0ffb2fe" of type "TEXT/PLAIN" (108358 bytes)

_______________________________________________
LKP mailing list
LKP@...ux.intel.com