WARNING chan_sip.c: sip_xmit returned -2: Interrupted system call

This looks like an Asterisk bug.
Unfortunately the log is verbosity 3.
We are running Asterisk with FreePBX

Last valid call was at 13:06 from 5144390648 to Dest 5147489836. It get’s disconnected with
"[2011-05-01 13:06:54] WARNING[3160] chan_sip.c: sip_xmit of 0xb68262b0 (len 608) to returned -2: Interrupted system call"

and then Asterisk is locked up until I reboot the system.

During that time I was actually on another call “9721818…” and even though the call did not get disconnected it was not recorded in the CDR.

I don’t know how to attach a file so the log is available at this link:
(replace hxxp:// with http)

Search for the string ***. This is the actual untouched log. At 13:06 Asterisk locks up and the log stops recording for 15 minutes. Then it starts recording again but Asterisk is still locked up and we can’t make outbound calls.

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