Critical Fault handling
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Tim Prouty 2009
+ Copyright (C) James Peach 2006
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
-#include "includes.h"
+#include "replace.h"
#include "system/filesys.h"
+#include "system/wait.h"
#include "version.h"
#ifdef HAVE_SYS_SYSCTL_H
#include <sys/prctl.h>
#endif
+#include "debug.h"
+#include "lib/util/signal.h" /* Avoid /usr/include/signal.h */
+#include "substitute.h"
+#include "fault.h"
+
static struct {
bool disabled;
smb_panic_handler_t panic_handler;
counter++;
DEBUGSEP(0);
- DEBUG(0,("INTERNAL ERROR: Signal %d in pid %d (%s)",sig,(int)sys_getpid(),SAMBA_VERSION_STRING));
+ DEBUG(0,("INTERNAL ERROR: Signal %d in pid %d (%s)",sig,(int)getpid(),SAMBA_VERSION_STRING));
DEBUG(0,("\nPlease read the Trouble-Shooting section of the Samba HOWTO\n"));
DEBUGSEP(0);
smb_panic("internal error");
- /* smb_panic() never returns, so this is really redundent */
+ /* smb_panic() never returns, so this is really redundant */
exit(1);
}
********************************************************************/
void fault_setup(void)
{
+ static bool mxinit;
+
+ if (mxinit) {
+ return;
+ }
+ mxinit = true;
+
if (fault_state.disabled) {
return;
}
+#if !defined(HAVE_DISABLE_FAULT_HANDLING)
#ifdef SIGSEGV
CatchSignal(SIGSEGV, sig_fault);
#endif
#ifdef SIGABRT
CatchSignal(SIGABRT, sig_fault);
#endif
+#endif
}
_PUBLIC_ const char *panic_action = NULL;
/*
default smb_panic() implementation
*/
+static void smb_panic_default(const char *why) _NORETURN_;
static void smb_panic_default(const char *why)
{
- int result;
+ DBG_ERR("PANIC (pid %llu): %s\n",
+ (unsigned long long)getpid(), why);
+ log_stack_trace();
#if defined(HAVE_PRCTL) && defined(PR_SET_PTRACER)
/*
#endif
if (panic_action && *panic_action) {
- char pidstr[20];
char cmdstring[200];
- strlcpy(cmdstring, panic_action, sizeof(cmdstring));
- snprintf(pidstr, sizeof(pidstr), "%d", (int) getpid());
- all_string_sub(cmdstring, "%d", pidstr, sizeof(cmdstring));
- DEBUG(0, ("smb_panic(): calling panic action [%s]\n", cmdstring));
- result = system(cmdstring);
-
- if (result == -1)
- DEBUG(0, ("smb_panic(): fork failed in panic action: %s\n",
- strerror(errno)));
- else
- DEBUG(0, ("smb_panic(): action returned status %d\n",
- WEXITSTATUS(result)));
+ if (strlcpy(cmdstring, panic_action, sizeof(cmdstring)) < sizeof(cmdstring)) {
+ int result;
+ char pidstr[20];
+ snprintf(pidstr, sizeof(pidstr), "%d", (int) getpid());
+ all_string_sub(cmdstring, "%d", pidstr, sizeof(cmdstring));
+ DEBUG(0, ("smb_panic(): calling panic action [%s]\n", cmdstring));
+ result = system(cmdstring);
+
+ if (result == -1)
+ DEBUG(0, ("smb_panic(): fork failed in panic action: %s\n",
+ strerror(errno)));
+ else
+ DEBUG(0, ("smb_panic(): action returned status %d\n",
+ WEXITSTATUS(result)));
+ }
}
- DEBUG(0,("PANIC: %s\n", why));
#ifdef SIGABRT
CatchSignal(SIGABRT, SIG_DFL);
}
smb_panic_default(why);
}
+
+/*******************************************************************
+ Print a backtrace of the stack to the debug log. This function
+ DELIBERATELY LEAKS MEMORY. The expectation is that you should
+ exit shortly after calling it.
+********************************************************************/
+
+/* Buffer size to use when printing backtraces */
+#define BACKTRACE_STACK_SIZE 64
+
+
+#ifdef HAVE_LIBUNWIND_H
+#include <libunwind.h>
+#endif
+
+#ifdef HAVE_EXECINFO_H
+#include <execinfo.h>
+#endif
+
+void log_stack_trace(void)
+{
+#ifdef HAVE_LIBUNWIND
+ /* Try to use libunwind before any other technique since on ia64
+ * libunwind correctly walks the stack in more circumstances than
+ * backtrace.
+ */
+ unw_cursor_t cursor;
+ unw_context_t uc;
+ unsigned i = 0;
+
+ char procname[256];
+ unw_word_t ip, sp, off;
+
+ procname[sizeof(procname) - 1] = '\0';
+
+ if (unw_getcontext(&uc) != 0) {
+ goto libunwind_failed;
+ }
+
+ if (unw_init_local(&cursor, &uc) != 0) {
+ goto libunwind_failed;
+ }
+
+ DEBUG(0, ("BACKTRACE:\n"));
+
+ do {
+ ip = sp = 0;
+ unw_get_reg(&cursor, UNW_REG_IP, &ip);
+ unw_get_reg(&cursor, UNW_REG_SP, &sp);
+
+ switch (unw_get_proc_name(&cursor,
+ procname, sizeof(procname) - 1, &off) ) {
+ case 0:
+ /* Name found. */
+ case -UNW_ENOMEM:
+ /* Name truncated. */
+ DEBUGADD(0, (" #%u %s + %#llx [ip=%#llx] [sp=%#llx]\n",
+ i, procname, (long long)off,
+ (long long)ip, (long long) sp));
+ break;
+ default:
+ /* case -UNW_ENOINFO: */
+ /* case -UNW_EUNSPEC: */
+ /* No symbol name found. */
+ DEBUGADD(0, (" #%u %s [ip=%#llx] [sp=%#llx]\n",
+ i, "<unknown symbol>",
+ (long long)ip, (long long) sp));
+ }
+ ++i;
+ } while (unw_step(&cursor) > 0);
+
+ return;
+
+libunwind_failed:
+ DEBUG(0, ("unable to produce a stack trace with libunwind\n"));
+
+#elif defined(HAVE_BACKTRACE_SYMBOLS)
+ void *backtrace_stack[BACKTRACE_STACK_SIZE];
+ size_t backtrace_size;
+ char **backtrace_strings;
+
+ /* get the backtrace (stack frames) */
+ backtrace_size = backtrace(backtrace_stack,BACKTRACE_STACK_SIZE);
+ backtrace_strings = backtrace_symbols(backtrace_stack, backtrace_size);
+
+ DEBUG(0, ("BACKTRACE: %lu stack frames:\n",
+ (unsigned long)backtrace_size));
+
+ if (backtrace_strings) {
+ int i;
+
+ for (i = 0; i < backtrace_size; i++)
+ DEBUGADD(0, (" #%u %s\n", i, backtrace_strings[i]));
+
+ /* Leak the backtrace_strings, rather than risk what free() might do */
+ }
+
+#else
+ DEBUG(0, ("unable to produce a stack trace on this platform\n"));
+#endif
+}
git.samba.org / metze / samba / wip.git / blobdiff