linux-kernel - Re: [LTP] 3239b6f29b ("KEYS: return full count in keyring_read() if buffer is too small"): ltp.keyctl06.fail

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Date:   Tue, 05 Dec 2017 10:43:08 +0100
From:   Richard Palethorpe <rpalethorpe@...e.de>
To:     Eric Biggers <ebiggers@...gle.com>
Cc:     Fengguang Wu <fengguang.wu@...el.com>,
        Ben Hutchings <ben@...adent.org.uk>,
        LKML <linux-kernel@...r.kernel.org>,
        David Howells <dhowells@...hat.com>, lkp@...org,
        James Morris <james.l.morris@...cle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        ltp@...ts.linux.it
Subject: Re: [LTP] 3239b6f29b ("KEYS: return full count in keyring_read() if buffer is too small"): ltp.keyctl06.fail

Hello,

Eric Biggers writes:

> On Fri, Dec 01, 2017 at 10:40:12AM +0800, Fengguang Wu wrote:
>> Hi Eric,
>> 
>> We noticed LTP keyctl06 test regression in
>> 
>> commit: 3239b6f29bdfb4b0a2ba59df995fc9e6f4df7f1f ("KEYS: return full count in keyring_read() if buffer is too small")
>> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
>> 
>> on test machine: 48 threads Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz with 64G memory
>> with following parameters:
>> 
>> 	disk: 1HDD
>> 	fs: ext4
>> 	test: syscalls_part2
>> 
>> test-description: The LTP testsuite contains a collection of tools for testing the Linux kernel and related features.
>> test-url: http://linux-test-project.github.io/
>> 
>> To reproduce:
>> 
>>          git clone https://github.com/intel/lkp-tests.git
>>          cd lkp-tests
>>          bin/lkp install job.yaml  # job file is attached in this email
>>          bin/lkp run     job.yaml
>> 
>> testcase/path_params/tbox_group/run: ltp/1HDD-ext4-syscalls_part2/ivb44
>> 
>
> Did this include LTP commit f21703fe45d3 ("syscalls/keyctl06: update to test for
> follow-on fix")?  It would be really helpful if these reports would include the
> LTP commit that was used.
>
> Eric

We are getting the following result, even with the follow up patch:

keyctl06.c:68: FAIL: KEYCTL_READ returned 4 but expected 8

This is with SUSE SLE15 kernel 4.12.14. I haven't had chance to
investigate it yet.

-- 
Thank you,
Richard.