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From 7c52627446e32df64ad4cd3ac56ad515d0233cea Mon Sep 17 00:00:00 2001
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From: Michal Sekletar <msekleta@redhat.com>
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Date: Fri, 14 Dec 2018 15:17:27 +0100
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Subject: [PATCH] journald: correctly attribute log messages also with
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cgroupsv1
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With cgroupsv1 a zombie process is migrated to root cgroup in all
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hierarchies. This was changed for unified hierarchy and /proc/PID/cgroup
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reports cgroup to which process belonged before it exited.
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Be more suspicious about cgroup path reported by the kernel and use
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unit_id provided by the log client if the kernel reports that process is
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running in the root cgroup.
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Users tend to care the most about 'log->unit_id' mapping so systemctl
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status can correctly report last log lines. Also we wouldn't be able to
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infer anything useful from "/" path anyway.
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See: https://github.com/torvalds/linux/commit/2e91fa7f6d451e3ea9fec999065d2fd199691f9d
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(cherry picked from commit 672773b63a4ebf95242b27e63071b93073ebc1f5)
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Resolves: #1658115
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---
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src/journal/journald-context.c | 8 ++++++--
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1 file changed, 6 insertions(+), 2 deletions(-)
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diff --git a/src/journal/journald-context.c b/src/journal/journald-context.c
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index 51f79fd80..dba3525ed 100644
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--- a/src/journal/journald-context.c
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+++ b/src/journal/journald-context.c
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@@ -13,6 +13,8 @@
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#include "io-util.h"
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#include "journal-util.h"
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#include "journald-context.h"
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+#include "parse-util.h"
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+#include "path-util.h"
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#include "process-util.h"
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#include "procfs-util.h"
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#include "string-util.h"
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@@ -281,9 +283,11 @@ static int client_context_read_cgroup(Server *s, ClientContext *c, const char *u
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/* Try to acquire the current cgroup path */
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r = cg_pid_get_path_shifted(c->pid, s->cgroup_root, &t);
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- if (r < 0) {
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+ if (r < 0 || empty_or_root(t)) {
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- /* If that didn't work, we use the unit ID passed in as fallback, if we have nothing cached yet */
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+ /* We use the unit ID passed in as fallback if we have nothing cached yet and cg_pid_get_path_shifted()
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+ * failed or process is running in a root cgroup. Zombie processes are automatically migrated to root cgroup
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+ * on cgroupsv1 and we want to be able to map log messages from them too. */
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if (unit_id && !c->unit) {
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c->unit = strdup(unit_id);
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if (c->unit)
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