linux-kernel - Re: [mm/highmem] 61b205f579: WARNING:at_mm/highmem.c:#__kmap_local_sched

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Date:   Thu, 11 Mar 2021 08:02:20 -0800
From:   Ira Weiny <ira.weiny@...el.com>
To:     Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>
Cc:     kernel test robot <oliver.sang@...el.com>,
        David Sterba <dsterba@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "hch@...radead.org" <hch@...radead.org>,
        Christoph Hellwig <hch@....de>,
        LKML <linux-kernel@...r.kernel.org>,
        "lkp@...ts.01.org" <lkp@...ts.01.org>,
        "lkp@...el.com" <lkp@...el.com>
Subject: Re: [mm/highmem] 61b205f579:
 WARNING:at_mm/highmem.c:#__kmap_local_sched_out

On Tue, Mar 09, 2021 at 08:53:04PM +0000, Chaitanya Kulkarni wrote:
> Ira,
> 
> On 3/4/21 00:23, kernel test robot wrote:
> > Greeting,
> >
> > FYI, we noticed the following commit (built with gcc-9):
> >
> > commit: 61b205f579911a11f0b576f73275eca2aed0d108 ("mm/highmem: Convert memcpy_[to|from]_page() to kmap_local_page()")
> > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
> >
> >
> > in testcase: trinity
> > version: trinity-static-i386-x86_64-f93256fb_2019-08-28
> > with following parameters:
> >
> > 	runtime: 300s
> >
> > test-description: Trinity is a linux system call fuzz tester.
> > test-url: http://codemonkey.org.uk/projects/trinity/
> >
> >
> > on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 8G
> >
> > caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
> 
> Is the fix for this been posted yet ?

No.  I've been unable to reproduce it yet.

Ira

> 
> (asking since I didn't see the fix and my mailer is dropping emails from
>  lkml).