Messages in this thread | | | From | Мисбах-Соловьёв Вадим <> | Subject | KDBUS and freezing of DBUS-querying applications | Date | Fri, 02 Oct 2015 16:53:42 +0600 |
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Hello! I'm experiencing a strange issue, when using KDBUS, but I don't know how to properly report it and which info I should proide in addition to th one below.
In short, some userspace applications I'm using are freezing for about a minute or so, when thy trying to query system bus.
Mostly it hurts me (in my daily workflow) when I trying to open some network resource with kde-open5 (or even target application), because KF5 seavily depends on DBUS.
But some time ago I even experienced this with "sudo", and even when I tried to query system bus with qdbusviwer, it freezed too.
It is pretty hard to trace entire KF5, but talking about issue with sudo, when I straced it, I saw frreze on the:
> ppol(fd=9, ...
syscall
and when I looked in lsof, I noticed that fd9 is /sys/fs/kdbus/0-system/bus.
KF5 things also freezing on sending queries to dbus, but I just can't get exactly application that freezing (although, if I just open http-links in konsole kpart in either yakuake, konsole or kdevelop — any of them also freezing on kdbus fd).
To be honest, I'm not traced qdbusviewer, but I'm pretty sure it will show the same.
When I recompiling kernel without KDBUS (or move the module somewhere, so that SystemD can't autoload it), all that userspace things starting to work like a charm, without a freezes and timeouts.
When I enable KDBUS back (either as module or by compile it in the monolithic kernel), all the things reproduces again.
I'm tried with both SystemD-216 and SystemD-226.
P.S. I'll be happy to provide any additional info if you'll ask me.
-- Best regards, mva
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