found 619123 collectd/4.10.1-2.1
quit
Hi Mika,
Michael Prokop wrote:
> collectd is hanging in an endless loop (consuming CPU time) if
> /var/lib/collectd/rrd is a symlink, pointing to a mountpoint that's
> not available:
>
> # strace -f -p $PID_OF_COLLECTD
> [...]
> [pid 1033] mkdir("/var/lib/collectd/rrd", 0755) = -1 EEXIST (File exists)
> [pid 1033] stat("/var/lib/collectd/rrd", 0x7f7f08f28440) = -1 ENOENT (No
> such file or directory)
> [pid 1033] mkdir("/var/lib/collectd/rrd", 0755) = -1 EEXIST (File exists)
[...]
Yes, I can reproduce this.
The cause is in src/common.c:
while (42) {
if (stat (dir, &statbuf) == -1)
{
if (errno == ENOENT)
{
if (mkdir (dir, 0755) == 0)
break;
/* this might happen, if a different
thread created
* the directory in the meantime
* => call stat() again to check for
S_ISDIR() */
if (EEXIST == errno)
continue;
As you say, errno can be EEXIST because the directory entry is a symlink,
rather than the directory already having been made, which would let this loop
forever.
Minimal patch (untested):
src/common.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/src/common.c b/src/common.c
index 2598036d..d88b97e7 100644
--- a/src/common.c
+++ b/src/common.c
@@ -542,7 +542,7 @@ int check_create_dir (const char *file_orig)
}
while (42) {
- if (stat (dir, &statbuf) == -1)
+ if (stat (dir, &statbuf) == -1 && lstat (dir, &statbuf)
== -1)
{
if (errno == ENOENT)
{
--
1.7.8.2
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