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core: Add cache_media_frames debugging option.

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The media frame cache gets in the way of finding use after free errors of
media frames.  Tools like valgrind and MALLOC_DEBUG don't know when a
frame is released because it gets put into the cache instead of being
freed.

* Added the "cache_media_frames" option to asterisk.conf.  Disabling the
option helps track down media frame mismanagement when using valgrind or
MALLOC_DEBUG.  The cache gets in the way of determining if the frame is
used after free and who freed it.  NOTE: This option has no effect when
Asterisk is compiled with the LOW_MEMORY compile time option enabled
because the cache code does not exist.

To disable the media frame cache simply disable the cache_media_frames
option in asterisk.conf and restart Asterisk.

Sample asterisk.conf setting:
[options]
cache_media_frames=no

ASTERISK-27413

Change-Id: I0ab2ce0f4547cccf2eb214901835c2d951b78c00
This commit is contained in:
Richard Mudgett
2017-11-11 13:01:47 -06:00
parent 1250b7c664
commit 507d9b5f9e
6 changed files with 45 additions and 9 deletions
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8
main/asterisk.c
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@@ -676,6 +676,9 @@ static char *handle_show_settings(struct ast_cli_entry *e, int cmd, struct ast_c
ast_cli(a->fd, " Transmit silence during rec: %s\n", ast_test_flag(&ast_options, AST_OPT_FLAG_TRANSMIT_SILENCE) ? "Enabled" : "Disabled");
ast_cli(a->fd, " Generic PLC: %s\n", ast_test_flag(&ast_options, AST_OPT_FLAG_GENERIC_PLC) ? "Enabled" : "Disabled");
ast_cli(a->fd, " Min DTMF duration:: %u\n", option_dtmfminduration);
#if !defined(LOW_MEMORY)
ast_cli(a->fd, " Cache media frames: %s\n", ast_opt_cache_media_frames ? "Enabled" : "Disabled");
#endif
if (ast_option_rtpptdynamic == AST_RTP_PT_LAST_REASSIGN) {
ast_cli(a->fd, " RTP dynamic payload types: %u,%u-%u\n",
@@ -3827,6 +3830,11 @@ static void ast_readconfig(void)
/* Cache recorded sound files to another directory during recording */
} else if (!strcasecmp(v->name, "cache_record_files")) {
ast_set2_flag(&ast_options, ast_true(v->value), AST_OPT_FLAG_CACHE_RECORD_FILES);
#if !defined(LOW_MEMORY)
/* Cache media frames for performance */
} else if (!strcasecmp(v->name, "cache_media_frames")) {
ast_set2_flag(&ast_options, ast_true(v->value), AST_OPT_FLAG_CACHE_MEDIA_FRAMES);
#endif
/* Specify cache directory */
} else if (!strcasecmp(v->name, "record_cache_dir")) {
ast_copy_string(record_cache_dir, v->value, AST_CACHE_DIR_LEN);