linux-kernel - Re: cgroup: rmdir() does not complete

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 9 Sep 2010 15:39:09 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Mark Hills <mark@...o.org.uk>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	linux-kernel@...r.kernel.org
Subject: Re: cgroup: rmdir() does not complete

* Mark Hills <mark@...o.org.uk> [2010-09-09 11:01:45]:

> On Thu, 2 Sep 2010, KAMEZAWA Hiroyuki wrote:
> 
> [...]
> > But hmm...it's curious who holds mutex and what happens.
> 
> I have a system showing the failure case (but still do not have a way to 
> reliably repeat it)
> 
> Here are the two processes:
> 
> 23586 pts/0    RL+  5059:18 /net/homes/mhills/tmp/soaked-cgroup
> 23685 pts/6    DL+    0:00 /net/homes/mhills/tmp/soaked-cgroup
> 
> 23586 spends almost all of its time in 'RL+' status, occasionally it is 
> seen in 'DL+' status.
> 
> From my analysis before, both are blocked on rmdir(), but one is spinning, 
> holding the lock on the /cgroup, and the other is waiting for the lock. If 
> I strace 23586 then the rmdir() fails with EINTR.
>

Any chance you can compile with debug cgroup subsystem and get
information from there? 

-- 
	Three Cheers,
	Balbir
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/