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memdebug: produce stack trace dump with libbacktrace

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Enable with "configure --enable-backtrace", inserts a backtrace in the
memdump log when a torture test limit is reached.

Closes #19657
This commit is contained in:
Daniel Stenberg 2025-11-18 14:29:09 +01:00
parent b5265b24b0
commit c77bed81a2
No known key found for this signature in database
GPG Key ID: 5CC908FDB71E12C2
3 changed files with 58 additions and 1 deletions
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16
configure.ac
View File

@ -1108,6 +1108,22 @@ AS_HELP_STRING([--enable-libgcc],[use libgcc when linking]),
AC_MSG_RESULT(no)
)
AC_MSG_CHECKING([whether to use libbacktrace])
AC_ARG_WITH(backtrace,
AS_HELP_STRING([--enable-backtrace],[use libbacktrace when linking]),
[ case "$enableval" in
yes)
LIBS="-lbacktrace $LIBS"
AC_DEFINE(USE_BACKTRACE, 1, [if libbacktrace is in use])
AC_MSG_RESULT(yes)
;;
*)
AC_MSG_RESULT(no)
;;
esac ],
AC_MSG_RESULT(no)
)
CURL_CHECK_LIB_XNET
dnl gethostbyname without lib or in the nsl lib?

38
lib/memdebug.c
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@ -31,6 +31,10 @@
#include "urldata.h"
#include "curlx/fopen.h" /* for CURLX_FOPEN_LOW(), CURLX_FREOPEN_LOW() */
#ifdef USE_BACKTRACE
#include "backtrace.h"
#endif
/* The last 2 #include files should be in this order */
#include "curl_memory.h"
#include "memdebug.h"
@ -58,6 +62,9 @@ FILE *curl_dbg_logfile = NULL;
static bool registered_cleanup = FALSE; /* atexit registered cleanup */
static bool memlimit = FALSE; /* enable memory limit */
static long memsize = 0; /* set number of mallocs allowed */
#ifdef USE_BACKTRACE
struct backtrace_state *btstate;
#endif
/* LeakSantizier (LSAN) calls _exit() instead of exit() when a leak is detected
on exit so the logfile must be closed explicitly or data could be lost.
@ -73,6 +80,33 @@ static void curl_dbg_cleanup(void)
}
curl_dbg_logfile = NULL;
}
#ifdef USE_BACKTRACE
static void error_callback(void *data, const char *message, int error_number)
{
(void)data;
if(error_number == -1)
curl_dbg_log("compile with -g\n\n");
else
curl_dbg_log("Backtrace error %d: %s\n", error_number, message);
}
static int full_callback(void *data, uintptr_t pc, const char *pathname,
int line_number, const char *function)
{
(void)data;
(void)pc;
if(pathname || function || line_number)
curl_dbg_log("BT %s:%d -- %s\n", pathname, line_number, function);
return 0;
}
static void dump_bt(void)
{
backtrace_full(btstate, 0, full_callback, error_callback, NULL);
}
#else
#define dump_bt() /* nothing to do */
#endif
/* this sets the log filename */
void curl_dbg_memdebug(const char *logname)
@ -88,6 +122,9 @@ void curl_dbg_memdebug(const char *logname)
setbuf(curl_dbg_logfile, (char *)NULL);
#endif
}
#ifdef USE_BACKTRACE
btstate = backtrace_create_state(NULL, 0, error_callback, NULL);
#endif
if(!registered_cleanup)
registered_cleanup = !atexit(curl_dbg_cleanup);
}
@ -115,6 +152,7 @@ static bool countcheck(const char *func, int line, const char *source)
/* log to stderr also */
curl_mfprintf(stderr, "LIMIT %s:%d %s reached memlimit\n",
source, line, func);
dump_bt();
fflush(curl_dbg_logfile); /* because it might crash now */
/* !checksrc! disable ERRNOVAR 1 */
errno = ENOMEM;

5
tests/memanalyze.pl
View File

@ -130,7 +130,10 @@ while(<$fileh>) {
chomp $_;
my $line = $_;
$lnum++;
if($line =~ /^LIMIT ([^ ]*):(\d*) (.*)/) {
if($line =~ /^BT/) {
# back-trace, ignore
}
elsif($line =~ /^LIMIT ([^ ]*):(\d*) (.*)/) {
# new memory limit test prefix
my $i = $3;
my ($source, $linenum) = ($1, $2);