[KRdp] [Bug 507949] RDP sessions that are not closed client side but stop receiving data cause OOM condition

[Cody Wilson]

https://bugs.kde.org/show_bug.cgi?id=507949

--- Comment #1 from Cody Wilson <cody at codywilson.co> ---
Created attachment 184002
  --> https://bugs.kde.org/attachment.cgi?id=184002&action=edit
pmap of krdpserver process while experiencing the high memory event

Output of other memory diagnostic commands against krdpserver during a high
memory event. 

Repro steps are identical to what was reported in the original bug submission. 
❯ ps aux | grep krdpserver | grep -v grep
belthes+   51830  0.0  2.7 57349244 1754824 ?    SLsl Aug07   6:17
/usr/bin/krdpserver
❯ grep -i vmrss /proc/51830/status
VmRSS:   1525944 kB
❯ grep -e '^Rss' /proc/51830/smaps | awk '{sum += $2} END {print sum, "kB"}'
1355268 kB
               total        used        free      shared  buff/cache  
available
Mem:           61885       56668         543         154        5520       
5216
Swap:          61884       56238        5646

After stopping the session  via the tray icon: 

               total        used        free      shared  buff/cache  
available
Mem:           61885       52626        4579         179        5552       
9259
Swap:          61884       53285        8599


After restarting krdpserver:
❯ ps aux | grep krdpserver | grep -v grep
belthes+   51830  0.0  0.4 57180280 274420 ?     SLsl Aug07   6:22
/usr/bin/krdpserver
❯ grep -i vmrss /proc/51830/status
VmRSS:    271936 kB
❯ grep -e '^Rss' /proc/51830/smaps | awk '{sum += $2} END {print sum, "kB"}'
271936 kB

Log output: 

❯ journalctl --user -f -u app-org.kde.krdpserver
Aug 12 17:43:50 fate krdpserver[51830]: QObject::killTimer: Timers cannot be
stopped from another thread
Aug 12 17:43:50 fate krdpserver[51830]: QObject::startTimer: Timers cannot be
started from another thread
Aug 12 18:29:32 fate krdpserver[51830]: org.kde.krdp: Portal session was
closed!
Aug 12 18:29:33 fate krdpserver[51830]: [18:29:33:610] [51830:000497f9]
[ERROR][com.freerdp.core.transport] - [transport_default_write]:
BIO_should_retry returned an error: error:80000020:system library::Broken pipe
Aug 12 18:29:33 fate krdpserver[51830]: [18:29:33:610] [51830:000497f9]
[ERROR][com.freerdp.core.peer] - [transport_default_write]:
ERRCONNECT_CONNECT_TRANSPORT_FAILED [0x0002000D]
Aug 12 18:29:33 fate krdpserver[51830]: org.kde.krdp: Unable to check Virtual
Channel Manager file descriptor, closing connection
Aug 12 18:29:33 fate krdpserver[51830]: org.kde.krdp: Closing session
Aug 12 18:29:33 fate krdpserver[51830]: [18:29:33:634] [51830:0000ca76]
[ERROR][com.freerdp.core.transport] - [transport_default_write]:
BIO_should_retry returned an error: error:0A00010F:SSL routines::bad length
Aug 12 18:29:33 fate krdpserver[51830]: org.kde.krdp: Closing Freedesktop
Portal Session
Aug 12 18:29:33 fate krdpserver[51830]: QObject::~QObject: Timers cannot be
stopped from another thread

After restarting krdpserver:

❯ free -m
               total        used        free      shared  buff/cache  
available
Mem:           61885       12837       44389         179        5531      
49047
Swap:          61884       12696       49188

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