Date: Fri, 16 Sep 2016 00:14:26 +0000 (UTC) From: Hiren Panchasara <hiren@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r305853 - in stable/10: share/man/man4 sys/kern Message-ID: <201609160014.u8G0EQKU036798@repo.freebsd.org>
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Author: hiren Date: Fri Sep 16 00:14:26 2016 New Revision: 305853 URL: https://svnweb.freebsd.org/changeset/base/305853 Log: MFC r301522 (by bz) Implement a `show panic` command to DDB which will helpfully print the panic string again if set, in case it scrolled out of the active window. This avoids having to remember the symbol name. Also add a show callout <addr> command to DDB in order to inspect some struct callout fields in case of panics in the callout code. This may help to see if there was memory corruption or to further ease debugging problems. No objection by: bz Modified: stable/10/share/man/man4/ddb.4 stable/10/sys/kern/kern_shutdown.c stable/10/sys/kern/kern_timeout.c Directory Properties: stable/10/ (props changed) Modified: stable/10/share/man/man4/ddb.4 ============================================================================== --- stable/10/share/man/man4/ddb.4 Fri Sep 16 00:08:37 2016 (r305852) +++ stable/10/share/man/man4/ddb.4 Fri Sep 16 00:14:26 2016 (r305853) @@ -611,6 +611,13 @@ See the header file for more details on the exact meaning of the structure fields. .\" .Pp +.It Ic show Cm callout Ar addr +Show information about the callout structure +.Vt struct callout +present at +.Ar addr . +.\" +.Pp .It Ic show Cm cbstat Show brief information about the TTY subsystem. .\" @@ -839,6 +846,10 @@ option is specified the complete object is printed. .\" .Pp +.It Ic show Cm panic +Print the panic message if set. +.\" +.Pp .It Ic show Cm page Show statistics on VM pages. .\" Modified: stable/10/sys/kern/kern_shutdown.c ============================================================================== --- stable/10/sys/kern/kern_shutdown.c Fri Sep 16 00:08:37 2016 (r305852) +++ stable/10/sys/kern/kern_shutdown.c Fri Sep 16 00:14:26 2016 (r305853) @@ -1031,3 +1031,14 @@ mkdumpheader(struct kerneldumpheader *kd strlcpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring)); kdh->parity = kerneldump_parity(kdh); } + +#ifdef DDB +DB_SHOW_COMMAND(panic, db_show_panic) +{ + + if (panicstr == NULL) + db_printf("panicstr not set\n"); + else + db_printf("panic: %s\n", panicstr); +} +#endif Modified: stable/10/sys/kern/kern_timeout.c ============================================================================== --- stable/10/sys/kern/kern_timeout.c Fri Sep 16 00:08:37 2016 (r305852) +++ stable/10/sys/kern/kern_timeout.c Fri Sep 16 00:14:26 2016 (r305853) @@ -39,6 +39,7 @@ __FBSDID("$FreeBSD$"); #include "opt_callout_profiling.h" #include "opt_kdtrace.h" +#include "opt_ddb.h" #if defined(__arm__) #include "opt_timer.h" #endif @@ -60,6 +61,11 @@ __FBSDID("$FreeBSD$"); #include <sys/sysctl.h> #include <sys/smp.h> +#ifdef DDB +#include <ddb/ddb.h> +#include <machine/_inttypes.h> +#endif + #ifdef SMP #include <machine/cpu.h> #endif @@ -1576,3 +1582,34 @@ SYSCTL_PROC(_kern, OID_AUTO, callout_sta CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 0, sysctl_kern_callout_stat, "I", "Dump immediate statistic snapshot of the scheduled callouts"); + +#ifdef DDB +static void +_show_callout(struct callout *c) +{ + + db_printf("callout %p\n", c); +#define C_DB_PRINTF(f, e) db_printf(" %s = " f "\n", #e, c->e); + db_printf(" &c_links = %p\n", &(c->c_links)); + C_DB_PRINTF("%" PRId64, c_time); + C_DB_PRINTF("%" PRId64, c_precision); + C_DB_PRINTF("%p", c_arg); + C_DB_PRINTF("%p", c_func); + C_DB_PRINTF("%p", c_lock); + C_DB_PRINTF("%#x", c_flags); + C_DB_PRINTF("%#x", c_iflags); + C_DB_PRINTF("%d", c_cpu); +#undef C_DB_PRINTF +} + +DB_SHOW_COMMAND(callout, db_show_callout) +{ + + if (!have_addr) { + db_printf("usage: show callout <struct callout *>\n"); + return; + } + + _show_callout((struct callout *)addr); +} +#endif /* DDB */
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