svn commit: r212964 - head/sys/kern
mdf at FreeBSD.org
mdf at FreeBSD.org
Tue Sep 21 15:17:03 UTC 2010
On Tue, Sep 21, 2010 at 8:07 AM, Andriy Gapon <avg at freebsd.org> wrote:
> Author: avg
> Date: Tue Sep 21 15:07:44 2010
> New Revision: 212964
> URL: http://svn.freebsd.org/changeset/base/212964
>
> Log:
> kdb_backtrace: stack(9)-based code to print backtrace without any backend
>
> The idea is to add KDB and KDB_TRACE options to GENERIC kernels on
> stable branches, so that at least the minimal information is produced
> for non-specific panics like traps on page faults.
> The GENERICs in stable branches seem to already include STACK option.
>
> Reviewed by: attilio
> MFC after: 2 weeks
>
> Modified:
> head/sys/kern/subr_kdb.c
>
> Modified: head/sys/kern/subr_kdb.c
> ==============================================================================
> --- head/sys/kern/subr_kdb.c Tue Sep 21 12:57:43 2010 (r212963)
> +++ head/sys/kern/subr_kdb.c Tue Sep 21 15:07:44 2010 (r212964)
> @@ -28,6 +28,7 @@
> __FBSDID("$FreeBSD$");
>
> #include "opt_kdb.h"
> +#include "opt_stack.h"
>
> #include <sys/param.h>
> #include <sys/systm.h>
> @@ -37,6 +38,7 @@ __FBSDID("$FreeBSD$");
> #include <sys/pcpu.h>
> #include <sys/proc.h>
> #include <sys/smp.h>
> +#include <sys/stack.h>
> #include <sys/sysctl.h>
>
> #include <machine/kdb.h>
> @@ -300,6 +302,15 @@ kdb_backtrace(void)
> printf("KDB: stack backtrace:\n");
> kdb_dbbe->dbbe_trace();
> }
> +#ifdef STACK
> + else {
> + struct stack st;
> +
> + printf("KDB: stack backtrace:\n");
> + stack_save(&st);
> + stack_print(&st);
I'd recommend using stack_print_ddb(), as that avoids any locking
which may hang depending on how the kernel panic'd.
Thanks,
matthew
> + }
> +#endif
> }
>
> /*
>
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