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Enumerate processes via the pid hash table in kdb_thr_*().

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Processes part way through exit1() are not included in allproc.  Using
allproc to enumerate processes prevented getting the stack trace of a
thread in this part of exit1() via ddb.

Reviewed by:	kib
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D27826
This commit is contained in:
John Baldwin 2020-12-31 16:00:54 -08:00
parent 4e7d1b527c
commit 9acce1c992
1 changed files with 23 additions and 14 deletions
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37
sys/kern/subr_kdb.c
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@ -586,12 +586,15 @@ kdb_thr_first(void)
{
struct proc *p;
struct thread *thr;
u_int i;
FOREACH_PROC_IN_SYSTEM(p) {
if (p->p_flag & P_INMEM) {
thr = FIRST_THREAD_IN_PROC(p);
if (thr != NULL)
return (thr);
for (i = 0; i <= pidhash; i++) {
LIST_FOREACH(p, &pidhashtbl[i], p_hash) {
if (p->p_flag & P_INMEM) {
thr = FIRST_THREAD_IN_PROC(p);
if (thr != NULL)
return (thr);
}
}
}
return (NULL);
@ -602,7 +605,7 @@ kdb_thr_from_pid(pid_t pid)
{
struct proc *p;
FOREACH_PROC_IN_SYSTEM(p) {
LIST_FOREACH(p, PIDHASH(pid), p_hash) {
if (p->p_flag & P_INMEM && p->p_pid == pid)
return (FIRST_THREAD_IN_PROC(p));
}
@ -624,17 +627,23 @@ struct thread *
kdb_thr_next(struct thread *thr)
{
struct proc *p;
u_int hash;
p = thr->td_proc;
thr = TAILQ_NEXT(thr, td_plist);
do {
if (thr != NULL)
return (thr);
p = LIST_NEXT(p, p_list);
if (p != NULL && (p->p_flag & P_INMEM))
thr = FIRST_THREAD_IN_PROC(p);
} while (p != NULL);
return (NULL);
if (thr != NULL)
return (thr);
hash = p->p_pid & pidhash;
for (;;) {
p = LIST_NEXT(p, p_hash);
while (p == NULL) {
if (++hash > pidhash)
return (NULL);
p = LIST_FIRST(&pidhashtbl[hash]);
}
if (p->p_flag & P_INMEM)
return (FIRST_THREAD_IN_PROC(p));
}
}
int