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Cope with races while killing processes

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When systemd is involved in managing processes, it may start
killing off & tearing down croups associated with the process
while we're still doing virCgroupKillPainfully. We must
explicitly check for ENOENT and treat it as if we had finished
killing processes

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange 2013-07-26 16:02:22 +01:00
parent aedd46e7e3
commit 75304eaa1a
1 changed files with 14 additions and 1 deletions
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15
src/util/vircgroup.c
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@ -2550,6 +2550,12 @@ static int virCgroupKillInternal(virCgroupPtr group, int signum, virHashTablePtr
while (!done) {
done = true;
if (!(fp = fopen(keypath, "r"))) {
if (errno == ENOENT) {
VIR_DEBUG("No file %s, assuming done", keypath);
killedAny = false;
goto done;
}
virReportSystemError(errno,
_("Failed to read %s"),
keypath);
@ -2589,6 +2595,7 @@ static int virCgroupKillInternal(virCgroupPtr group, int signum, virHashTablePtr
}
}
done:
ret = killedAny ? 1 : 0;
cleanup:
@ -2658,8 +2665,13 @@ static int virCgroupKillRecursiveInternal(virCgroupPtr group, int signum, virHas
if (rc == 1)
killedAny = true;
VIR_DEBUG("Iterate over children of %s", keypath);
VIR_DEBUG("Iterate over children of %s (killedAny=%d)", keypath, killedAny);
if (!(dp = opendir(keypath))) {
if (errno == ENOENT) {
VIR_DEBUG("Path %s does not exist, assuming done", keypath);
killedAny = false;
goto done;
}
virReportSystemError(errno,
_("Cannot open %s"), keypath);
return -1;
@ -2689,6 +2701,7 @@ static int virCgroupKillRecursiveInternal(virCgroupPtr group, int signum, virHas
virCgroupFree(&subgroup);
}
done:
ret = killedAny ? 1 : 0;
cleanup: