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Subject: Re: 5.1.0-rc4: Oops in __rpc_execute() when trying to boot from NFS
To:     Trond Myklebust <trondmy@hammerspace.com>,
        "bfields@fieldses.org" <bfields@fieldses.org>,
        "linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>,
        "jlayton@kernel.org" <jlayton@kernel.org>
Cc:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
References: <0412f79c-61a8-bfa4-26ce-1083a59d31e8@zonque.org>
 <ce6d2388a9214f95cc38de5ec225cba26cf63b0d.camel@hammerspace.com>
From:   Daniel Mack <daniel@zonque.org>
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Message-ID: <4f4bb4a9-f752-f9f4-41cd-5c41d6191308@zonque.org>
Date:   Tue, 9 Apr 2019 18:25:13 +0200
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On 8/4/2019 8:51 PM, Trond Myklebust wrote:
> On Mon, 2019-04-08 at 19:01 +0200, Daniel Mack wrote:
>> Hi,
>>
>> I'm seeing the Oops below when trying to boot 5.1.0-rc4 on an ARM
>> PXA3xx
>> platform. v5.0 did not show this effect with the same cmdline.
>>

> Please do bisect if that is at all practical. I'm having trouble
> interpreting this Oops.

Here you go:

009a82f6437490c262584d65a14094a818bcb747 is the first bad commit
commit 009a82f6437490c262584d65a14094a818bcb747
Author: Trond Myklebust <trond.myklebust@hammerspace.com>
Date:   Sat Mar 9 12:07:17 2019 -0500

    SUNRPC: Micro-optimise when the task is known not to be sleeping

    In cases where we know the task is not sleeping, try to optimise
    away the indirect call to task->tk_action() by replacing it with
    a direct call.
    Only change tail calls, to allow gcc to perform tail call
    elimination.

    Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

:040000 040000 9803b15cf8f094c6c9cf92cef34232b8173aa915
a13d38cf4e3fd4724c9b83ec837714407eda4fb6 M	include
:040000 040000 89666ad30932dc247554c9aff79d6b4f210be573
6d41d1d3e47ddcf2b9bd87a2ea43743ab18844be M	net


Any idea?

Thanks,
Daniel