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Re: crash in xfs in current

To: Dave Chinner <david@xxxxxxxxxxxxx>, Reinoud Koornstra <reinoudkoornstra@xxxxxxxxx>
Subject: Re: crash in xfs in current
From: Daniel Wagner <wagi@xxxxxxxxx>
Date: Thu, 30 Jun 2016 08:04:09 +0200
Cc: Eric Sandeen <sandeen@xxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, viro@xxxxxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20160622014253.GS12670@dastard>
References: <48817b4c-26f4-5eb6-8a97-d8fa34fe7f6a@xxxxxxxxx> <20160607134442.GA1803@xxxxxxxxxxxxx> <CAAA5faFWyPDienm2NbHkafZh-RvbjJp6f_zDq62z6rC1d1Vzyw@xxxxxxxxxxxxxx> <CAAA5faGXHJZPWkkxDM-kvHqh--hPhnD1Y8RuaaSmuzgiz=_LDg@xxxxxxxxxxxxxx> <CAAA5faEDdR_L6y9ShhUcermgvjtmzNCzwoYeENjx+8RUEMdwaA@xxxxxxxxxxxxxx> <20160609022238.GY26977@dastard> <CAAA5faGL_Nyu=jW2Vrgr_m7crhnB9BriWWzMAPODbiQATFhS=Q@xxxxxxxxxxxxxx> <00bbe658-a891-3771-ca1d-5661a8b6ab61@xxxxxxxxxxx> <CAAA5faH7RA=_WByj6uh4yVCLgwxkLh88CkrtTOa-qJqdyEDT-A@xxxxxxxxxxxxxx> <CAAA5faGTL4i3YS_oLxoeetpsEt+q59dmc2L7Kc-b5khzoV0GvA@xxxxxxxxxxxxxx> <20160622014253.GS12670@dastard>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.1.1
> Ok, that's good to hear. Now for some more testing: Al Viro just
> pushed some fixes to the parallel lookup code that may fix this
> problem. Al asked this question:
> 
> | Can that be triggered on 4e82901 + cherry-pick of e7d6ef979?
> | Same for 9f541801 + e7d6ef979?
> 
> Those commits are all in the current Linus tree - would you be
> able to test them? (i.e. check out tree to 4e82901, then just
> cherry pick the single commit (e7d6ef979) on top of that).

Finally I found some time to do some testing.

In one shell, git did some checkouts:

  while true; do git checkout master && git checkout b4.0; done

While in the other shell I just rebuild a kernel:

  while true; do make clean && make -j200; done

4e82901              crashed after 10 minutes
4e82901 + e7d6ef979  no crash after 4 hours
9f541801             no crash after 2 hours
9f541801 + e7d6ef979 no crash after 12 hours

cheers,
daniel

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