linux-kernel - ufs build failure (no __udivdi3) on i386 in linux tip (edf9364d3f92)

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Date:   Mon, 19 Jun 2017 15:36:47 +0100
From:   Ian Jackson <ian.jackson@...citrix.com>
To:     Evgeniy Dushistov <dushistov@...l.ru>
CC:     <xen-devel@...ts.xensource.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jonathan Cameron <jic23@...nel.org>,
        "Jens Axboe" <axboe@...com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        <linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: ufs build failure (no __udivdi3) on i386 in linux tip (edf9364d3f92)

osstest service owner writes ("[linux-linus bisection] complete build-i386-pvops"):
> branch xen-unstable
> xenbranch xen-unstable
> job build-i386-pvops
> testid kernel-build
> 
> Tree: linux git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
> Tree: linuxfirmware git://xenbits.xen.org/osstest/linux-firmware.git
> 
> *** Found and reproduced problem changeset ***
> 
>   Bug is in tree:  linux git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
>   Bug introduced:  edf9364d3f924aff6f77176b8e52a4b68e5c30d6
>   Bug not present: 791a9a666d1afe2603bcb2c6a4852d684e879252
>   Last fail repro: http://logs.test-lab.xenproject.org/osstest/logs/110566/

This is a merge commit, so the bisection result is not very useful:

   git-log --pretty=oneline 791a9a666d1afe2603bcb2c6a4852d684e879252..edf9364d3f924aff6f77176b8e52a4b68e5c30d6 | wc -l
   2233

The error message is this:

   ERROR: "__udivdi3" [fs/ufs/ufs.ko] undefined!
   scripts/Makefile.modpost:91: recipe for target '__modpost' failed
   make[1]: *** [__modpost] Error 1

I searched the commit log and CC'd a couple of people who have fixed
similar bugs elsewhere.

Ian.