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Merged revisions 67020 via svnmerge from

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https://origsvn.digium.com/svn/asterisk/branches/1.4

........
r67020 | russell | 2007-06-04 10:47:40 -0500 (Mon, 04 Jun 2007) | 7 lines

Resolve a deadlock in chan_iax2.  When handling an implicit ACK to a frame that
was marked as the final transmission for a call, don't call iax2_destroy() for
that call while the global frame queue is still locked.  There is a very nice
explanation of the deadlock in the report.
(issue #9663, thorough report and patch from stevedavies, additional positive
 test reports from mihai and joff_oconnell)

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@67022 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Russell Bryant
2007-06-04 15:50:46 +00:00
parent b1fcf2ef13
commit d6f2b914e8
1 changed files with 9 additions and 5 deletions
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14
channels/chan_iax2.c
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@@ -6844,6 +6844,7 @@ static int socket_process(struct iax2_thread *thread)
((f.subclass != IAX_COMMAND_INVAL) ||
(f.frametype != AST_FRAME_IAX))) {
unsigned char x;
int call_to_destroy;
/* XXX This code is not very efficient. Surely there is a better way which still
properly handles boundary conditions? XXX */
/* First we have to qualify that the ACKed value is within our window */
@@ -6857,20 +6858,23 @@ static int socket_process(struct iax2_thread *thread)
/* Ack the packet with the given timestamp */
if (option_debug && iaxdebug)
ast_log(LOG_DEBUG, "Cancelling transmission of packet %d\n", x);
call_to_destroy = 0;
AST_LIST_LOCK(&queue);
AST_LIST_TRAVERSE(&queue, cur, list) {
/* If it's our call, and our timestamp, mark -1 retries */
if ((fr->callno == cur->callno) && (x == cur->oseqno)) {
cur->retries = -1;
/* Destroy call if this is the end */
if (cur->final) {
if (iaxdebug && option_debug)
ast_log(LOG_DEBUG, "Really destroying %d, having been acked on final message\n", fr->callno);
iax2_destroy(fr->callno);
}
if (cur->final)
call_to_destroy = fr->callno;
}
}
AST_LIST_UNLOCK(&queue);
if (call_to_destroy) {
if (iaxdebug && option_debug)
ast_log(LOG_DEBUG, "Really destroying %d, having been acked on final message\n", call_to_destroy);
iax2_destroy(call_to_destroy);
}
}
/* Note how much we've received acknowledgement for */
if (iaxs[fr->callno])