[pkg-gnupg-maint] Bug#858400: gnupg2 2.1.19-3 fails to build on s390x with segfault in xcheck

[Daniel Kahn Gillmor]

Package: gnupg2
Version: 2.1.19-3
Control: -1 tags + help

On Tue 2017-03-21 17:32:27 -0400, Daniel Kahn Gillmor wrote:
> but since the upgrade to 2.1.19-3 in experimental, we're seeing the the
> segfault on s390x.
>
> I'm not even sure how to interpret the error message: is it saying that
> make itself Segfaulted, or that gpgscm segfaulted?
>
> I've connected to zelenka to try to reproduce the problem directly on
> s390x but i haven't been able to get there yet.

OK, i've managed to reproduce some of the failures (intermittently) on a
sid chroot (named "gnupg2-xcheck-segfault") in zelenka.

With the source of 2.1.19-3 in /home/dkg/src/gnupg2/gnupg2, and having
built the package out-of-tree in /home/dkg/src/gnupg2/gnupg2/build (via
debian/rules), i repeatedly run just the first two simple test suites
From /home/dkg/src/gnupg2/gnupg2/:

LC_ALL=C EXEEXT= PATH=../gpgscm:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games srcdir=/home/dkg/src/gnupg2/gnupg2/build/../tests/openpgp objdir=/home/dkg/src/gnupg2/gnupg2/build GPGSCM_PATH=/home/dkg/src/gnupg2/gnupg2/build/../tests/gpgscm:/home/dkg/src/gnupg2/gnupg2/build/../tests/openpgp /home/dkg/src/gnupg2/gnupg2/build/tests/gpgscm/gpgscm   run-tests.scm  version.scm

The failures are intermittent -- sometimes no failures, sometimes both
run-tests.scm and version.scm fail, sometimes only one of them.

In one example, i got this result:

PASS: setup.scm 
gpgscm: error running 'version.scm': terminated
FAIL: version.scm 
1 tests run, 0 succeeded, 1 failed, 0 skipped. 
Failed tests: version.scm 


and then looking in dmesg, i see the following log:

[1099865.715125] User process fault: interruption code 0x4003B in gpgscm[2aae2582000+37000]
[1099865.715135] failing address: 00000000196d1000 TEID: 00000000196d1800
[1099865.715138] Fault in primary space mode while using user ASCE.
[1099865.715141] AS:000000007feec1c7 R3:0000000000000024 
[1099865.715145] CPU: 0 PID: 7395 Comm: gpgscm Not tainted 3.16.0-4-s390x #1 Debian 3.16.39-1+deb8u2
[1099865.715148] task: 00000000fb6ea108 ti: 000000003d600000 task.ti: 000000003d600000
[1099865.715151] User PSW : 0705200180000000 000002aae259450a
[1099865.715154]            R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:1 AS:0 CC:2 PM:0 EA:3
                 User GPRS: 000002ab196c6888 000000000000003f 00000000196d1588 0000000000000007
[1099865.715160]            000002aae2596876 0000000000000001 0000000000000008 000002ab196c6888
[1099865.715163]            000002ab196c6868 0000000000000008 0000000000000007 000002ab196c6740
[1099865.715166]            000003fffd59c000 000002ab196c6888 000002aae25968ce 000003ffff893098
[1099865.715175] User Code: 000002aae25944fe: 0707              bcr     0,%r7
                            000002aae2594500: a718003f          lhi     %r1,63
                           #000002aae2594504: ebeff0700024      stmg    %r14,%r15,112(%r15)
                           >000002aae259450a: 54102000          n       %r1,0(%r2)
                            000002aae259450e: a7fbff60          aghi    %r15,-160
                            000002aae2594512: a71e0017          chi     %r1,23
                            000002aae2594516: a7740016          brc     7,2aae2594542
                            000002aae259451a: e33020080021      clg     %r3,8(%r2)
[1099865.715286] Last Breaking-Event-Address:
[1099865.715301]  [<000002aae25968c8>] 0x2aae25968c8


I have no idea what this means :(

Any suggestions?  The failures are intermittent enough that i imagine
just a series of repeated givebacks *might* result in one successful
test, but that isn't very satisfying.

I'm reporting this to the BTS so that we have someplace specific to
track the problem.  Please drop submit at bugs.debian.org from any
followup!

Hoping for some help,

       --dkg
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