https://bugs.kde.org/show_bug.cgi?id=366720
Bug ID: 366720
Summary: stat() on faulty nfs mountpoints causes all KDE
applications to deadlock (kill -9 required)
Product: frameworks-solid
Version: 5.24.0
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: crash
Priority: NOR
Component: general
Assignee: lu...@kde.org
Reporter: elv1...@gmail.com
CC: kdelibs-b...@kde.org
Mounting NFS shares using the kernel module can cause hard (infinite) lock when
the network is unstable. This is because, by default, the file system is
configured to retry until things work. However, this cause in itself the
network to be flooded and make congestion worst.
This is well documented and isn't a KDE issue. However, this has to be taken
into account by KDE and it isn't. As KDEINIT5 can stat these mountpoint and
lock itself to oblivion, everything talking to KDEINIT also lock. So, in the
end, everything lock and killall -9 from ctrl+alt+f1 is required.
I think what trigger the lock is the open/save file dialog or dolphin sidebar
with the fs list.
To reproduce, mount an nfs (v3) share using the "mount -t nfs" command and
shutdown the server. This will also happen when copying big files over slow
wifi (TCP retry amplification problem).
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