Add support for enhanced crash log stacktraces using gdb on Linux.
This attempts to use gdb to attach to the current process and print a full backtrace.
This commit is contained in:
Jonathan G Rennison
65
config.lib
65
config.lib
@@ -97,6 +97,7 @@ set_default() {
|
||||
with_sse="1"
|
||||
with_libbfd="1"
|
||||
with_bfd_extra_debug="1"
|
||||
with_dbg_gdb="1"
|
||||
|
||||
save_params_array="
|
||||
build
|
||||
@@ -176,6 +177,7 @@ set_default() {
|
||||
with_sse
|
||||
with_libbfd
|
||||
with_bfd_extra_debug
|
||||
with_dbg_gdb
|
||||
CC CXX CFLAGS CXXFLAGS LDFLAGS CFLAGS_BUILD CXXFLAGS_BUILD LDFLAGS_BUILD"
|
||||
}
|
||||
|
||||
@@ -477,6 +479,10 @@ detect_params() {
|
||||
--with-bfd-extra-debug) with_bfd_extra_debug="1";;
|
||||
--with-bfd-extra-debug=*) with_bfd_extra_debug="$optarg";;
|
||||
|
||||
--without-self-gdb-debug) with_dbg_gdb="0";;
|
||||
--with-self-gdb-debug) with_dbg_gdb="1";;
|
||||
--with-self-gdb-debug=*) with_dbg_gdb="$optarg";;
|
||||
|
||||
CC=* | --CC=*) CC="$optarg";;
|
||||
CXX=* | --CXX=*) CXX="$optarg";;
|
||||
CFLAGS=* | --CFLAGS=*) CFLAGS="$optarg";;
|
||||
@@ -1614,6 +1620,7 @@ EOL
|
||||
CFLAGS="$CFLAGS -DWITH_DL"
|
||||
fi
|
||||
|
||||
LIBBFD_LIBS=
|
||||
if [ "$with_libbfd" = "1" ]; then
|
||||
if test_compile_libbfd "-lbfd -lz"; then
|
||||
LIBBFD_LIBS="-lbfd -lz"
|
||||
@@ -1621,20 +1628,67 @@ EOL
|
||||
LIBBFD_LIBS="-lbfd -liberty -lz"
|
||||
elif test_compile_libbfd "-lbfd -liberty -lintl -lz"; then
|
||||
LIBBFD_LIBS="-lbfd -liberty -lintl -lz"
|
||||
else
|
||||
LIBBFD_LIBS=
|
||||
fi
|
||||
if [ -n "$LIBBFD_LIBS" ]; then
|
||||
log 1 "checking libbfd... found"
|
||||
LIBS="$LIBS $LIBBFD_LIBS"
|
||||
CFLAGS="$CFLAGS -DWITH_BFD"
|
||||
if [ $enable_debug -lt 1 ] && [ "$with_bfd_extra_debug" = "1" ]; then
|
||||
CFLAGS="$CFLAGS -g1"
|
||||
fi
|
||||
else
|
||||
log 1 "checking libbfd... no"
|
||||
fi
|
||||
fi
|
||||
|
||||
HAVE_GDB_DBG=
|
||||
if [ "$with_dbg_gdb" = "1" ]; then
|
||||
log 2 "executing $cc_host $CFLAGS $LDFLAGS $STATIC_FLAGS -o tmp.config.dbggdb -x c++ -"
|
||||
"$cc_host" $CFLAGS $LDFLAGS $STATIC_FLAGS -o tmp.config.dbggdb -x c++ - 2> /dev/null << EOL
|
||||
#include <unistd.h>
|
||||
#include <sys/stat.h>
|
||||
#include <fcntl.h>
|
||||
#include <sys/syscall.h>
|
||||
#include <sys/types.h>
|
||||
#include <sys/wait.h>
|
||||
int main() {
|
||||
pid_t tid = syscall(SYS_gettid);
|
||||
int status;
|
||||
waitpid((pid_t) 0, &status, 0);
|
||||
return WIFEXITED(status) && WEXITSTATUS(status);
|
||||
}
|
||||
EOL
|
||||
ret=$?
|
||||
rm -f tmp.config.dbggdb
|
||||
log 2 " exit code $ret"
|
||||
if [ $ret -ne 0 ]; then
|
||||
log 1 "checking dbg gdb... no"
|
||||
else
|
||||
log 1 "checking dbg gdb... found"
|
||||
CFLAGS="$CFLAGS -DWITH_DBG_GDB"
|
||||
HAVE_GDB_DBG=1
|
||||
|
||||
log 2 "executing $cc_host $CFLAGS $LDFLAGS $STATIC_FLAGS -o tmp.config.dbggdbprctl -x c++ -"
|
||||
"$cc_host" $CFLAGS $LDFLAGS $STATIC_FLAGS -o tmp.config.dbggdbprctl -x c++ - 2> /dev/null << EOL
|
||||
#include <sys/prctl.h>
|
||||
int main() {
|
||||
return prctl(PR_SET_PTRACER, PR_SET_PTRACER_ANY, 0, 0, 0);
|
||||
}
|
||||
EOL
|
||||
ret=$?
|
||||
rm -f tmp.config.dbggdbprctl
|
||||
log 2 " exit code $ret"
|
||||
if [ $ret -ne 0 ]; then
|
||||
log 1 "checking dbg gdb (prctl)... no"
|
||||
else
|
||||
log 1 "checking dbg gdb (prctl)... found"
|
||||
CFLAGS="$CFLAGS -DWITH_PRCTL_PT"
|
||||
fi
|
||||
fi
|
||||
fi
|
||||
|
||||
if [ -n "$LIBBFD_LIBS" -o -n "$HAVE_GDB_DBG" ]; then
|
||||
if [ $enable_debug -lt 1 ] && [ "$with_bfd_extra_debug" = "1" ]; then
|
||||
CFLAGS="$CFLAGS -g1"
|
||||
fi
|
||||
fi
|
||||
fi
|
||||
|
||||
if [ "$os" = "MINGW" ]; then
|
||||
@@ -3694,6 +3748,7 @@ showhelp() {
|
||||
echo " --without-sse disable SSE support (x86/x86_64 only)"
|
||||
echo " --without-libbfd disable libbfd support, used for improved crash logs (MinGW and Unix/glibc only)"
|
||||
echo " --without-bfd-extra-debug disable extra debugging information when using libbfd (MinGW and Unix/glibc only)"
|
||||
echo " --without-self-gdb-debug disable improved crash logs using gdb (Linux only)"
|
||||
echo ""
|
||||
echo "Some influential environment variables:"
|
||||
echo " CC C compiler command"
|
||||
|
||||
@@ -21,6 +21,19 @@
|
||||
#include <sys/utsname.h>
|
||||
#include <setjmp.h>
|
||||
|
||||
#if defined(WITH_DBG_GDB)
|
||||
#include <unistd.h>
|
||||
#include <sys/stat.h>
|
||||
#include <fcntl.h>
|
||||
#include <sys/syscall.h>
|
||||
#include <sys/types.h>
|
||||
#include <sys/wait.h>
|
||||
#endif /* WITH_DBG_GDB */
|
||||
|
||||
#if defined(WITH_PRCTL_PT)
|
||||
#include <sys/prctl.h>
|
||||
#endif /* WITH_PRCTL_PT */
|
||||
|
||||
#if defined(__GLIBC__)
|
||||
/* Execinfo (and thus making stacktraces) is a GNU extension */
|
||||
# include <execinfo.h>
|
||||
@@ -131,6 +144,79 @@ class CrashLogUnix : public CrashLog {
|
||||
}
|
||||
#endif
|
||||
|
||||
/**
|
||||
* Get a stack backtrace of the current thread's stack using the gdb debugger, if available.
|
||||
*
|
||||
* Using GDB is useful as it knows about inlined functions and locals, and generally can
|
||||
* do a more thorough job than in LogStacktrace.
|
||||
* This is done in addition to LogStacktrace as gdb cannot be assumed to be present
|
||||
* and there is some potentially useful information in the output from LogStacktrace
|
||||
* which is not in gdb's output.
|
||||
*/
|
||||
char *LogStacktraceGdb(char *buffer, const char *last) const
|
||||
{
|
||||
#if defined(WITH_DBG_GDB)
|
||||
|
||||
#if defined(WITH_PRCTL_PT)
|
||||
prctl(PR_SET_PTRACER, PR_SET_PTRACER_ANY, 0, 0, 0);
|
||||
#endif /* WITH_PRCTL_PT */
|
||||
|
||||
pid_t tid = syscall(SYS_gettid);
|
||||
|
||||
int pipefd[2];
|
||||
if (pipe(pipefd) == -1) return buffer;
|
||||
|
||||
int pid = fork();
|
||||
if (pid < 0) return buffer;
|
||||
|
||||
if (pid == 0) {
|
||||
/* child */
|
||||
|
||||
close(pipefd[0]); /* Close unused read end */
|
||||
dup2(pipefd[1], STDOUT_FILENO);
|
||||
close(pipefd[1]);
|
||||
int null_fd = open("/dev/null", O_RDWR);
|
||||
if (null_fd != -1) {
|
||||
dup2(null_fd, STDERR_FILENO);
|
||||
dup2(null_fd, STDIN_FILENO);
|
||||
}
|
||||
char buffer[16];
|
||||
seprintf(buffer, lastof(buffer), "%d", tid);
|
||||
execlp("gdb", "gdb", "-n", "-p", buffer, "-batch", "-ex", "bt full", NULL);
|
||||
exit(42);
|
||||
}
|
||||
|
||||
/* parent */
|
||||
|
||||
close(pipefd[1]); /* Close unused write end */
|
||||
|
||||
char *buffer_orig = buffer;
|
||||
|
||||
buffer += seprintf(buffer, last, "Stacktrace (GDB):\n");
|
||||
while (buffer < last) {
|
||||
ssize_t res = read(pipefd[0], buffer, last - buffer);
|
||||
if (res < 0) {
|
||||
if (errno == EINTR) continue;
|
||||
break;
|
||||
} else if (res == 0) {
|
||||
break;
|
||||
} else {
|
||||
buffer += res;
|
||||
}
|
||||
}
|
||||
buffer += seprintf(buffer, last, "\n");
|
||||
|
||||
int status;
|
||||
int wait_ret = waitpid(pid, &status, 0);
|
||||
if (wait_ret == -1 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) {
|
||||
/* gdb did not appear to run successfully */
|
||||
buffer = buffer_orig;
|
||||
}
|
||||
#endif /* WITH_DBG_GDB */
|
||||
|
||||
return buffer;
|
||||
}
|
||||
|
||||
/**
|
||||
* Get a stack backtrace of the current thread's stack.
|
||||
*
|
||||
@@ -156,6 +242,8 @@ class CrashLogUnix : public CrashLog {
|
||||
*/
|
||||
/* virtual */ char *LogStacktrace(char *buffer, const char *last) const
|
||||
{
|
||||
buffer = LogStacktraceGdb(buffer, last);
|
||||
|
||||
buffer += seprintf(buffer, last, "Stacktrace:\n");
|
||||
|
||||
#if defined(__GLIBC__)
|
||||
|
||||
Reference in New Issue
Block a user