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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 6f1910d6ec
commit 90bb0a3e10
6 changed files with 45 additions and 9 deletions
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5
include/asterisk/options.h
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@@ -66,6 +66,8 @@ enum ast_option_flags {
AST_OPT_FLAG_CACHE_RECORD_FILES = (1 << 13),
/*! Display timestamp in CLI verbose output */
AST_OPT_FLAG_TIMESTAMP = (1 << 14),
/*! Cache media frames for performance */
AST_OPT_FLAG_CACHE_MEDIA_FRAMES = (1 << 15),
/*! Reconnect */
AST_OPT_FLAG_RECONNECT = (1 << 16),
/*! Transmit Silence during Record() and DTMF Generation */
@@ -99,7 +101,7 @@ enum ast_option_flags {
};
/*! These are the options that set by default when Asterisk starts */
#define AST_DEFAULT_OPTIONS AST_OPT_FLAG_TRANSCODE_VIA_SLIN
#define AST_DEFAULT_OPTIONS (AST_OPT_FLAG_TRANSCODE_VIA_SLIN | AST_OPT_FLAG_CACHE_MEDIA_FRAMES)
#define ast_opt_exec_includes ast_test_flag(&ast_options, AST_OPT_FLAG_EXEC_INCLUDES)
#define ast_opt_no_fork ast_test_flag(&ast_options, AST_OPT_FLAG_NO_FORK)
@@ -116,6 +118,7 @@ enum ast_option_flags {
#define ast_opt_stdexten_macro ast_test_flag(&ast_options, AST_OPT_FLAG_STDEXTEN_MACRO)
#define ast_opt_dump_core ast_test_flag(&ast_options, AST_OPT_FLAG_DUMP_CORE)
#define ast_opt_cache_record_files ast_test_flag(&ast_options, AST_OPT_FLAG_CACHE_RECORD_FILES)
#define ast_opt_cache_media_frames ast_test_flag(&ast_options, AST_OPT_FLAG_CACHE_MEDIA_FRAMES)
#define ast_opt_timestamp ast_test_flag(&ast_options, AST_OPT_FLAG_TIMESTAMP)
#define ast_opt_reconnect ast_test_flag(&ast_options, AST_OPT_FLAG_RECONNECT)
#define ast_opt_transmit_silence ast_test_flag(&ast_options, AST_OPT_FLAG_TRANSMIT_SILENCE)