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Subject: Re: Build error in 3.18.y-stable-queue (s390)
To: Sasha Levin <sasha.levin@oracle.com>
References: <56F210BD.1060301@roeck-us.net> <56F219B0.3040107@roeck-us.net>
 <56F3DFC3.8060600@oracle.com> <20160324180155.GA15991@roeck-us.net>
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Cc: stable <stable@vger.kernel.org>
From: Guenter Roeck <linux@roeck-us.net>
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Date: Sun, 27 Mar 2016 08:35:23 -0700
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Hi Sasha,

On 03/26/2016 10:41 PM, Sasha Levin wrote:
...
>
> Should be fixed now, I hope.
>

Builds now all pass, but now I get runtime errors on arm and microblaze qemu tests.

WARNING: CPU: 0 PID: 33 at mm/mmap.c:2787 exit_mmap+0x1ac/0x230()

You'll need to also pick up commit b30fe6c7ced7 ("mm: fix false-positive warning
on exit due mm_nr_pmds(mm)") to fix that.

The s390 qemu test now builds, but the test itself gets a RCU stall and hangs.
Reverting "s390/mm: four page table levels vs. fork" fixes the problem.

Guenter