Bug#916678: systemd: Caught <SEGV>, dumped core as pid 2097

[Michael Biebl]

Am 17.12.18 um 13:13 schrieb Cristian Ionescu-Idbohrn:
> On Mon, 17 Dec 2018, Michael Biebl wrote:
>>
>> Control: severity -1 important
>> Control: tags -1 moreinfo
>>
>> Am 17.12.18 um 11:25 schrieb Cristian Ionescu-Idbohrn:
>>
>>> | systemd[1]: Caught <SEGV>, dumped core as pid 2097.
>>
>> Please try to get a backtrace following
>> https://wiki.debian.org/HowToGetABacktrace
> 
> Sorry, too late :(
> 
> As I mentioned, ssh login failed and phisical console was far away.  
> I needed to get that box alive again.  Got it rebooted.
> 
> Isn't this:
> 
> ,----
> | 2018-12-16 17:16:08 host:6665 0,1210,543999638601,-;systemd[1]: segfault at ffffffffffffffe0 ip 00007f2d93990647 sp 00007ffcabd85028 error 5
> | 2018-12-16 17:16:08 host:6665 4,1211,543999661307,c; in libc-2.28.so[7f2d93856000+148000]
> `----
> 
> sufficient?

Unfortunately not. This just shows that there was a segfault, but not
where and why. With a backtrace there is a much better chance to find
the root cause (but even then, it will most likely be hard to figure out)
Do you by chance still have a core file of the crash?

> It reports the origin of the segfault is libc 2.28, which was upgraded 
> from 2.27 behind systemd's back:
> 
>     -libc-bin 2.27-8 amd64
>     -libc-dev-bin 2.27-8 amd64
>     -libc-l10n 2.27-8 all
>     -libc6 2.27-8 amd64
>     -libc6-dbg 2.27-8 amd64
>     -libc6-dev 2.27-8 amd64
>     -libc6-dev-i386 2.27-8 amd64
>     -libc6-dev-x32 2.27-8 amd64
>     -libc6-i386 2.27-8 amd64
>     -libc6-x32 2.27-8 amd64
>     +libc-bin 2.28-2 amd64
>     +libc-dev-bin 2.28-2 amd64
>     +libc-l10n 2.28-2 all
>     +libc6 2.28-2 amd64
>     +libc6-dbg 2.28-2 amd64
>     +libc6-dev 2.28-2 amd64
>     +libc6-dev-i386 2.28-2 amd64
>     +libc6-dev-x32 2.28-2 amd64
>     +libc6-i386 2.28-2 amd64
>     +libc6-x32 2.28-2 amd64
> 
> There could have been a daemon-reexec too, at some point.  I don't 
> recall.

I haven't seen a segfault in a very long time and you are the first one
reporting one wrt the libc6 update. Which I suspect makes it hard to
reproduce this issue. Do you by chance have a backup of the system from
before the upgrade, which you could restore into a test system and
re-run the upgrade?

Michael

-- 
Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?

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