Bug#801501: libqt5sql5: libQt5 segfault when computer resumes from standby

[Xavier <x.guimard@free.fr>]

On 11/10/2015 18:33, Lisandro Damián Nicanor Pérez Meyer wrote:
> Control: tag -1 moreinfo
> 
> On Saturday 10 October 2015 21:33:29 Xavier Guimard wrote: [snip]
> 
> Hi Xavier!
> 
>> When my laptop (MacBook AIr) resumes from standby, KDE crashes if
>> it was opened before standby. No problem when kdm is closed. If
>> session is closed but kdm open, sometimes it works fine,
>> sometimes not. Looking logs, I found each time the following line
>> in kern.log:
>> 
>> [  948.387826] kactivitymanage[1515]: segfault at 7f458c022cd0
>> ip 00007f458695f1b1 sp 00007ffd92065b18 error 4 in 
>> libQt5Sql.so.5.4.2[7f458694b000+3f000]]
>> 
>> I had a look at #796708, but patch seems not to be compliant
>> with testing/unstable version
> 
> You should probably not use kdm at this point. Please try again
> making sure your system is up to date and with sddm, and see if you
> can reproduce the bug.

Hi Lisandro,

same problem with sddm, but segfault occurs later (more than 1 minute
after resume). I found other logs:  when a KDE session is opened, _and
only in this case_, the screen flashes as soon the computer resumes.
nouveau/kwin seem involved:

Oct 11 23:05:40 mac-debian kernel: [  144.724915] nouveau
E[kwin_x11[1511]] fail set_domain
Oct 11 23:05:40 mac-debian kernel: [  144.724921] nouveau
E[kwin_x11[1511]] validating bo list
Oct 11 23:05:40 mac-debian kernel: [  144.724928] nouveau
E[kwin_x11[1511]] validate: -22
Oct 11 23:05:40 mac-debian kernel: [  144.762168] nouveau
E[kwin_x11[1511]] fail set_domain
Oct 11 23:05:40 mac-debian kernel: [  144.762176] nouveau
E[kwin_x11[1511]] validating bo list
Oct 11 23:05:40 mac-debian kernel: [  144.762183] nouveau
E[kwin_x11[1511]] validate: -22

Each group of 3 lines appears to correspond to a blink.

Note that before upgrade to testing, the computer worked perfectly.

Regards,
Xavier