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Add ability to dump stacktraces on kernel panics when DDB is compiled into

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the kernel.  By default this is turned off since otherwise it could scroll
valuable panic messages off of the screen.  This option can be turned on
by the DDB_TRACE kernel option as well as the debug.trace_on_panic sysctl.

Also, fix the DDB_UNATTENDED option to use its own header instead of
abusing opt_ddb.h.  This way turning that one option on or off doesn't
force you to recompile all of ddb.

Requested by:	many (1), bde (2*)

* - I know bde prefers !abusing option headers in general but can't
    remember if he as brought up this specific case.
This commit is contained in:
jhb 2002-09-19 18:49:46 +00:00
parent 03dc7bc4a4
commit c3f8f24620
1 changed files with 17 additions and 2 deletions
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19
sys/kern/kern_shutdown.c
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@ -40,6 +40,8 @@
*/
#include "opt_ddb.h"
#include "opt_ddb_trace.h"
#include "opt_ddb_unattended.h"
#include "opt_hw_wdog.h"
#include "opt_panic.h"
#include "opt_show_busybufs.h"
@ -91,6 +93,14 @@ int debugger_on_panic = 1;
#endif
SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
&debugger_on_panic, 0, "Run debugger on kernel panic");
#ifdef DDB_TRACE
int trace_on_panic = 1;
#else
int trace_on_panic = 0;
#endif
SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
&trace_on_panic, 0, "Print stack trace on kernel panic");
#endif
int sync_on_panic = 1;
@ -434,7 +444,7 @@ void
panic(const char *fmt, ...)
{
struct thread *td = curthread;
int bootopt;
int bootopt, newpanic;
va_list ap;
static char buf[256];
@ -453,10 +463,13 @@ panic(const char *fmt, ...)
#endif
bootopt = RB_AUTOBOOT | RB_DUMP;
newpanic = 0;
if (panicstr)
bootopt |= RB_NOSYNC;
else
else {
panicstr = fmt;
newpanic = 1;
}
va_start(ap, fmt);
(void)vsnprintf(buf, sizeof(buf), fmt, ap);
@ -475,6 +488,8 @@ panic(const char *fmt, ...)
#endif
#if defined(DDB)
if (newpanic && trace_on_panic)
db_print_backtrace();
if (debugger_on_panic)
Debugger ("panic");
#ifdef RESTARTABLE_PANICS