Author: cem
Date: Thu Apr 2 20:47:51 2020
New Revision: 359581
URL: https://svnweb.freebsd.org/changeset/base/359581
Log:
ddb(4): show lockchain: Don't dereference LK_KERNPROC
Also, print a little more information for otherwise unhandled inhibited
states.
Finally, improve the grammar of some prints. Some of the print statements
missing verb.
Sponsored by: Dell EMC Isilon
Modified:
head/sys/kern/subr_turnstile.c
Modified: head/sys/kern/subr_turnstile.c
==============================================================================
--- head/sys/kern/subr_turnstile.c Thu Apr 2 20:06:37 2020
(r359580)
+++ head/sys/kern/subr_turnstile.c Thu Apr 2 20:47:51 2020
(r359581)
@@ -1180,17 +1180,21 @@ print_lockchain(struct thread *td, const char *prefix)
* blocked on a lock that has an owner.
*/
while (!db_pager_quit) {
- db_printf("%sthread %d (pid %d, %s) ", prefix, td->td_tid,
+ if (td == (void *)LK_KERNPROC) {
+ db_printf("%sdisowned (LK_KERNPROC)\n", prefix);
+ return;
+ }
+ db_printf("%sthread %d (pid %d, %s) is ", prefix, td->td_tid,
td->td_proc->p_pid, td->td_name);
switch (td->td_state) {
case TDS_INACTIVE:
- db_printf("is inactive\n");
+ db_printf("inactive\n");
return;
case TDS_CAN_RUN:
- db_printf("can run\n");
+ db_printf("runnable\n");
return;
case TDS_RUNQ:
- db_printf("is on a run queue\n");
+ db_printf("on a run queue\n");
return;
case TDS_RUNNING:
db_printf("running on CPU %d\n", td->td_oncpu);
@@ -1218,7 +1222,7 @@ print_lockchain(struct thread *td, const char *prefix)
td = owner;
break;
}
- db_printf("inhibited\n");
+ db_printf("inhibited: %s\n", KTDSTATE(td));
return;
default:
db_printf("??? (%#x)\n", td->td_state);
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