freetdm: add debug stacktrace to track spurious channel_on_hangup call

diff --git a/libs/freetdm/mod_freetdm/mod_freetdm.c b/libs/freetdm/mod_freetdm/mod_freetdm.c
index 805e5813999bed7b66c34e2285b16ef63e0eb328..7e0bb55a1b37ed7ee21a9940c20f671741b3eeba 100755 (executable)
--- a/libs/freetdm/mod_freetdm/mod_freetdm.c
+++ b/libs/freetdm/mod_freetdm/mod_freetdm.c
@@ -34,6 +34,15 @@
 #include <switch.h>
 #include "freetdm.h"
 
+//#define CUDATEL_DEBUG
+#ifdef CUDATEL_DEBUG
+#ifndef _BSD_SOURCE
+#define _BSD_SOURCE
+#endif
+#include <execinfo.h>
+#include <syscall.h>
+#endif
+
 #ifndef __FUNCTION__
 #define __FUNCTION__ __SWITCH_FUNC__
 #endif
@@ -495,6 +504,7 @@ static switch_status_t channel_on_hangup(switch_core_session_t *session)
        switch_channel_t *channel = NULL;
        private_t *tech_pvt = NULL;
        ftdm_chan_type_t chantype;
+       const char *name = NULL;
        uint32_t tokencnt;
 
        channel = switch_core_session_get_channel(session);
@@ -506,9 +516,29 @@ static switch_status_t channel_on_hangup(switch_core_session_t *session)
        /* ignore any further I/O requests, we're hanging up already! */
        switch_clear_flag_locked(tech_pvt, TFLAG_IO);
        
+       name = switch_channel_get_name(channel);
+       switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "%s CHANNEL HANGUP ENTER\n", name);
+
        if (!tech_pvt->ftdmchan) {
                goto end;
-       } 
+       }
+
+#ifdef CUDATEL_DEBUG
+       {
+               pid_t tid = 0;
+               size_t size = 0;
+               char **symbols = NULL;
+               void *stacktrace[50];
+               int si = 0;
+               size = backtrace(stacktrace, ftdm_array_len(stacktrace));
+               symbols = backtrace_symbols(stacktrace, size);
+               tid = syscall(SYS_gettid);
+               for (si = 0; si < size; si++) {
+                       switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "[%d] %s -> %s\n", tid, name, symbols[si]);
+               }
+               free(symbols);
+       }
+#endif
 
        ftdm_channel_clear_token(tech_pvt->ftdmchan, switch_core_session_get_uuid(session));
 
@@ -551,7 +581,6 @@ static switch_status_t channel_on_hangup(switch_core_session_t *session)
 
  end:
 
-       switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "%s CHANNEL HANGUP\n", switch_channel_get_name(channel));
        switch_mutex_lock(globals.mutex);
        globals.calls--;
        if (globals.calls < 0) {
@@ -559,6 +588,7 @@ static switch_status_t channel_on_hangup(switch_core_session_t *session)
        }
        switch_mutex_unlock(globals.mutex);
 
+       switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "%s CHANNEL HANGUP EXIT\n", name);
        return SWITCH_STATUS_SUCCESS;
 }