linux-kernel - Re: v2.6.21.5-rt19 (sched

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: <1184708473.21931.22.camel@cmn3.stanford.edu>
Date:	Tue, 17 Jul 2007 14:41:13 -0700
From:	Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Gabriel C <nix.or.die@...glemail.com>,
	Carsten Emde <carsten.emde@...dl.org>,
	"jcaceres@...ma.Stanford.EDU" <jcaceres@...ma.Stanford.EDU>,
	Steven Rostedt <rostedt@...dmis.org>,
	RT-Users <linux-rt-users@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Rui Nuno Capela <rncbc@...bc.org>, nando@...ma.Stanford.EDU
Subject: Re: v2.6.21.5-rt19 (sched_getaffinity?)

On Tue, 2007-07-17 at 22:12 +0200, Ingo Molnar wrote:
> * Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU> wrote:
> 
> > On Tue, 2007-07-17 at 21:32 +0200, Ingo Molnar wrote:
> > > * Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU> wrote:
> > > 
> > > > I do get flash 9 (I know, not the best example) and tomboy to hang as 
> > > > reported by one of my Planet CCRMA users - flash 9 tested working on 
> > > > stock fedora 7 kernel - and both seem to hang in the same system call:
> > > > 
> > > > sched_getaffinity(3528, 32, <unfinished ...>
> > > > 
> > > > Full output of strace attached for both cases.
> > > 
> > > hm, that's weird. Is it completely unkillable at that time? Could you do 
> > > a few things: enable CONFIG_PROVE_LOCKING (lockdep), and also try to get 
> > > a full task state dump via:
> > > 
> > >   echo t > /proc/sysrq-trigger
> > 
> > Trace attached... the process stays in D state no matter what. 

Just in case, it repeats under 2.6.22.1-rt4 (< rt4 did not boot into my
t61 laptop, this one at least does that). I'm including the (probably
redundant) dump. 

I have to build a new kernel with prove locking...

-- Fernando


> hm, seems to be related to:
> 
> Jul 17 12:51:18 localhost kernel: sched-powersa D [f0aaf930] 00000005  6584  3420   3407
> 
> which blocks the cpu-hotplug mutex:
> 
> Jul 17 12:51:18 localhost kernel: Call Trace:
> Jul 17 12:51:18 localhost kernel:  [<c0603f46>] schedule+0xe0/0xfa
> Jul 17 12:51:18 localhost kernel:  [<c0604d0d>] rt_mutex_slowlock+0x164/0x20b
> Jul 17 12:51:18 localhost kernel:  [<c0604a5c>] rt_mutex_lock+0x3c/0x3f
> Jul 17 12:51:18 localhost kernel:  [<c0423bb4>] sched_getaffinity+0x14/0x94
> Jul 17 12:51:18 localhost kernel:  [<c045a647>] __synchronize_sched+0xd/0x5a
> Jul 17 12:51:18 localhost kernel:  [<c0423732>] arch_reinit_sched_domains+0x18/0x33
> Jul 17 12:51:18 localhost kernel:  [<c0423789>] sched_power_savings_store+0x3c/0x49
> Jul 17 12:51:18 localhost kernel:  [<c0552cd4>] sysdev_class_store+0x1e/0x22
> Jul 17 12:51:18 localhost kernel:  [<c04b195b>] sysfs_write_file+0xa3/0xc6
> Jul 17 12:51:18 localhost kernel:  [<c047a64a>] vfs_write+0xa8/0x154
> Jul 17 12:51:18 localhost kernel:  [<c047ac65>] sys_write+0x41/0x67
> Jul 17 12:51:18 localhost kernel:  [<c0404f7c>] syscall_call+0x7/0xb
> 
> and firefox blocks on the same mutex too:
> 
> Jul 17 12:51:18 localhost kernel: firefox-bin   D [efc44670] 00000012  6368  4388      1
> Jul 17 12:51:18 localhost kernel: Call Trace:
> Jul 17 12:51:18 localhost kernel:  [<c0603f46>] schedule+0xe0/0xfa
> Jul 17 12:51:18 localhost kernel:  [<c0604d0d>] rt_mutex_slowlock+0x164/0x20b
> Jul 17 12:51:18 localhost kernel:  [<c0604a5c>] rt_mutex_lock+0x3c/0x3f
> Jul 17 12:51:18 localhost kernel:  [<c0423bb4>] sched_getaffinity+0x14/0x94
> Jul 17 12:51:18 localhost kernel:  [<c0423c53>] sys_sched_getaffinity+0x1f/0x41
> Jul 17 12:51:18 localhost kernel:  [<c0404f7c>] syscall_call+0x7/0xb
> Jul 17 12:51:18 localhost kernel:  [<b7f0f410>] 0xb7f0f410
> 
> does lockdep pinpoint anything?
> 
> 	Ingo

Download attachment "trace2.txt.gz" of type "application/x-gzip" (21875 bytes)