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  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:	Thu, 3 Apr 2014 12:11:03 -0700
From:	David Cohen <>
Subject: Re: Soft lockup regression since kernel 3.13

On Wed, Apr 02, 2014 at 04:29:48PM -0700, David Cohen wrote:
> Hi,
> I've detected a regression from upstream (using an Intel Merrifield
> device) since 3.13 (still exists in 3.14) which I never had much time
> to start to investigate until now. The symptoms are: the device boots
> and works fine for while until it silently hangs.
> I finally bisected v3.12..v3.13 and found exactly which commit created
> the issue:
> commit f27dde8deef33c9e58027df11ceab2198601d6a6
> Author: Peter Zijlstra <>
> Date:   Wed Aug 14 14:55:31 2013 +0200
>     sched: Add NEED_RESCHED to the preempt_count

FWIW I did further investigation and made the issue to go away with this

diff --git a/arch/x86/include/asm/preempt.h
index c8b051933b1b..41744d99c88f 100644
--- a/arch/x86/include/asm/preempt.h
+++ b/arch/x86/include/asm/preempt.h
@@ -95,7 +95,7 @@ static __always_inline bool
   static __always_inline bool should_resched(void)
    -       return unlikely(!__this_cpu_read_4(__preempt_count));
    +       return unlikely(tif_need_resched());
       #ifdef CONFIG_PREEMPT

I extended part of this patch to x86:

commit ba1f14fbe70965ae0fb1655a5275a62723f65b77
Author: Peter Zijlstra <>
Date:   Thu Nov 28 14:26:41 2013 +0100

    sched: Remove PREEMPT_NEED_RESCHED from generic code

Br, David Cohen
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

Powered by blists - more mailing lists