linux-kernel - Re: [lkp] [NFSv4] 931437ee2c: BUG: sleeping function called from invalid context at mm/slab.h:393

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Date:   Fri, 28 Oct 2016 23:08:14 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     kernel test robot <xiaolong.ye@...el.com>
Cc:     Trond Myklebust <trond.myklebust@...marydata.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        tglx@...utronix.de, lkp@...org
Subject: Re: [lkp] [NFSv4]  931437ee2c: BUG: sleeping function called from
 invalid context at mm/slab.h:393

On 2016-10-25 14:52:39 [+0800], kernel test robot wrote:
> 
> FYI, we noticed the following commit:
> 
> https://github.com/0day-ci/linux Sebastian-Andrzej-Siewior/NFSv4-replace-seqcount_t-with-a-seqlock_t/20161022-013104
> commit 931437ee2c100a50c36771c947ce3674f8160592 ("NFSv4: replace seqcount_t with a seqlock_t")
> 
> in testcase: ebizzy
> with following parameters:
> 
> 	nr_threads: 200%
> 	iterations: 100x
> 	duration: 10s
> 
> 
> ebizzy is designed to generate a workload resembling common web application server workloads.
> 
> 
> on test machine: qemu-system-x86_64 -enable-kvm -cpu kvm64,+ssse3 -m 1G

It can't get it triggered. In fact I never get even close to the code
path. I tried NFS as rootfs and this test of yours. And I tried
"xfstests-dev -nfs" with no luck.
So you have NFS as your rootfs. Anything special on the server side? It
seems to be a basic NFSv4 export.

Sebastian