linux-kernel - Re: Idle loadavg of ~1, maybe MD related

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Message-ID: <20080105100455.GB911@curie-int.orbis-terrarum.net>
Date:	Sat, 5 Jan 2008 02:04:55 -0800
From:	"Robin H. Johnson" <robbat2@...too.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Robin H. Johnson" <robbat2@...too.org>,
	linux-kernel@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: Idle loadavg of ~1, maybe MD related

On Sat, Jan 05, 2008 at 01:30:37AM -0800, Andrew Morton wrote:
> >From that I'd suspect that kwindfarm is being a bad citizen.
> If a process is consistently stuck in D state, run
Windfarm.

> 	echo w > /proc/sysrq-trigger
> then record the resulting dmesg output so we can see where it got stuck.

Traceback:
[552710.416174] SysRq : Show Blocked State
[552710.417876]   task                        PC stack   pid father
[552710.417888] kwindfarm     D 0000000000000000     0   829      2
[552710.417892] Call Trace:
[552710.417895] [c00000036c9835f0] [c000000000528b90] 0xc000000000528b90 (unreliable)
[552710.417908] [c00000036c9837c0] [c00000000000f4a8] .__switch_to+0xd8/0x110
[552710.417985] [c00000036c983850] [c0000000003bb2a0] .schedule+0x62c/0x6c8
[552710.417992] [c00000036c983940] [c0000000003bb8c4] .schedule_timeout+0x3c/0xe8
[552710.417997] [c00000036c983a10] [c0000000003bb51c] .wait_for_common+0x100/0x1bc
[552710.418002] [c00000036c983ae0] [c000000000285300] .smu_fan_set+0x17c/0x1e4
[552710.418009] [c00000036c983c30] [c000000000284078] .pm112_wf_notify+0xc50/0x12d0
[552710.418015] [c00000036c983d20] [c0000000003bfb84] .notifier_call_chain+0x5c/0xcc
[552710.418021] [c00000036c983dc0] [c00000000006f4b4] .__blocking_notifier_call_chain+0x70/0xb0
[552710.418027] [c00000036c983e70] [c000000000282d9c] .wf_thread_func+0x78/0x11c
[552710.418032] [c00000036c983f00] [c000000000069b00] .kthread+0x78/0xc4
[552710.418039] [c00000036c983f90] [c000000000023d0c] .kernel_thread+0x4c/0x68
[552710.418064] Sched Debug Version: v0.07, 2.6.24-rc6-prod-g6f0f5304 #10
[552710.418067] now at 552723945.170635 msecs
[552710.418070]   .sysctl_sched_latency                    : 60.000000
[552710.418073]   .sysctl_sched_min_granularity            : 12.000000
[552710.418076]   .sysctl_sched_wakeup_granularity         : 30.000000
[552710.418079]   .sysctl_sched_batch_wakeup_granularity   : 30.000000
[552710.418082]   .sysctl_sched_child_runs_first           : 0.000001
[552710.418085]   .sysctl_sched_features                   : 7

Full output at
http://dev.gentoo.org/~robbat2/20080105_windfarm_sysrq_w.txt

-- 
Robin Hugh Johnson
Gentoo Linux Developer & Infra Guy
E-Mail     : robbat2@...too.org
GnuPG FP   : 11AC BA4F 4778 E3F6 E4ED  F38E B27B 944E 3488 4E85

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