linux-kernel - ppc compat v4.16 regression: sending SIGTRAP or SIGFPE via kill() returns wrong values in si_pid and si

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Date:   Mon, 9 Apr 2018 18:22:53 +0300
From:   "Dmitry V. Levin" <ldv@...linux.org>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: ppc compat v4.16 regression: sending SIGTRAP or SIGFPE via kill()
 returns wrong values in si_pid and si_uid

Hi,

There seems to be a regression in v4.16 on ppc compat very similar
to sparc compat regression reported earlier at
https://marc.info/?l=linux-sparc&m=151501500704383 .

The symptoms are exactly the same: the same signal_receive test from
the strace test suite fails with the same diagnostics:
https://build.opensuse.org/public/build/home:ldv_alt/openSUSE_Factory_PowerPC/ppc/strace/_log

Unfortunately, I do not have any means to investigate further,
so just passing this information on to those who care.

-- 
ldv

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