Re: kauditd hold queue overflow in 4.11

Le 10/07/17 à 18:00, Paul Moore a écrit : > On Mon, Jul 10, 2017 at 10:59 AM, Laurent Bigonville <bigon(a)debian.org&gt; > wrote: >> >> Hi, >> >> With 4.11.6 (that has been uploaded in debian unstable) I get a lot of >> messages in dmesg like >> >> [100052.120468] audit: audit_lost=66041 audit_rate_limit=0 >> audit_backlog_limit=8192 >> [100052.120470] audit: kauditd hold queue overflow >> >> And it also seems that the messages are not stored in auditd logs >> anymore. >> >> https://git.kernel.org/linus/264d509637d95f9404e52ced5003ad352e0f6a26 >> seems >> to be included in this release >> >> An idea? > > I'm going to assume that your backlog limit is set to a sane value for > your system's configuration, so that leaves me with two commits that > may be of interest: > > * 1df30f8264b8 ("audit: fix the RCU locking for the auditd_connection > structure") > > This was a manual backport of a v4.12 patch to v4.11, looking now, I > see it should be in +v4.11.5 so that probably isn't your problem ... > > * c81be52a3ac0 ("audit: fix a race condition with the auditd tracking > code") > > This patch is relatively new and was just sent up to Linus during the > next merge window; it's a race condition fix so reproducing it can be > tricky, although it may be easily reproducible on your system at the > moment (luck you!). If you aren't in a position to apply the patch, > the workaround is rather simple: restart auditd. > > If none of the above works, let me know, but I strongly suspect you're > tripping over the race condition fixed in that last patch. > I didn't test the patch yet, but I restarted the auditd daemon 2 times and after that the queue has been flushed and I got all the message since this noon in the audit logs.

It's auditd 2.7.7 if that matters.