linux-kernel - Re: rcu: BUG: spinlock recursion on CPU#3, trinity-child19/5970

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]

Message-ID: <1341062889.27537.9.camel@lappy>
Date:	Sat, 30 Jun 2012 15:28:09 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Dave Jones <davej@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: rcu: BUG: spinlock recursion on CPU#3, trinity-child19/5970

On Sat, 2012-06-30 at 06:14 -0700, Paul E. McKenney wrote:
> On Sat, Jun 30, 2012 at 01:36:48PM +0200, Sasha Levin wrote:
> > Hi Paul,
> > 
> > On Fri, 2012-06-29 at 10:23 -0700, Paul E. McKenney wrote:
> > > Please see below for an untested patch that gets RCU out of this loop,
> > > but it is quite possible that something else is involved here, so it would
> > > be very good to get a lockdep run, if possible.  My concern stems from the
> > > fact that interrupts were enabled during the call to __rcu_read_unlock()
> > > -- otherwise it would not have been preempted -- so the runqueue locks
> > > were presumably not held on entry to __rcu_read_unlock(). 
> > 
> > I'll continue with the good news/bad news theme.
> > 
> > Good news - the original problem I've reported seems to be gone.
> > 
> > Bad news - I'm getting the following instead:
> 
> Interesting...
> 
> You are still running with lockdep?

It should be on, yes. I don't see anything in dmesg which would suggest
it got disabled before this spew.

I've attached my .config. I'm starting the kernel with "sched_debug
slub_debug=FZPU numa=fake=10" as well.

View attachment "config_fuzzkvm" of type "text/x-mpsub" (132782 bytes)