vboxwebsrv dies when session is left open too long

[Chris Brown]

When a session is established to vboxwebsrv and is open for too long vboxwebsrv goes into the following state (or dies):

00:41:32.956733 SQW01 authenticate(): result of AuthEntry(): 0
00:41:32.956775 SQPmp Request 1328 on socket 15 queued for processing (1 items on Q)
00:41:32.956818 SQPmp #### SOAP FAULT: Too many open files [SOAP-ENV:Server]
00:41:32.956836 SQPmp #### SOAP FAULT: Too many open files [SOAP-ENV:Server]
00:41:32.956847 SQW05 Processing connection from IP= socket=15 (2 out of 5 threads idle)

[Chris Brown]

vboxwebsrv log

[Chris Brown]

I note that this can also be caused by sending a large amount of API commands either over time or all at once to vboxwebsrv.

The vboxwebsrv crash also sometimes leaves the following in /var/log/messages:

kernel: SQW04[29960]: segfault at 0 ip 000000000040779f sp 00007fabbdfbea20 error 4 in vboxwebsrv[400000+1007000]
abrt[30620]: Saved core dump of pid 29929 (/usr/lib/virtualbox/vboxwebsrv) to /var/spool/abrt/ccpp-2014-03-12-14:35:32-29929 (15269888 bytes)