Messages in this thread | | | Date | Tue, 5 Feb 2008 13:17:36 -0800 | From | Robin Lee Powell <> | Subject | Re: Monthly md check == hung machine; how do I debug? |
| |
On Wed, Feb 06, 2008 at 07:27:56AM +1100, Neil Brown wrote: > On Tuesday February 5, rlpowell@digitalkingdom.org wrote: > > > > I was able to solve the problem, however, like so: > > > > 132c133 > > < # CONFIG_PREEMPT_NONE is not set > > --- > > > CONFIG_PREEMPT_NONE=y > > 134,135c135,136 > > < CONFIG_PREEMPT=y > > < CONFIG_PREEMPT_BKL=y > > --- > > > # CONFIG_PREEMPT is not set > > > # CONFIG_PREEMPT_BKL is not set > > > > This suggests that there is some sort of race. Given that I've > never hit it on SMP machines, it is probably a very small window > that opens immediately after some event that triggers kernel > preemption. > > The only "mdadm --monitor" does
Going to stop you right there; "mdadm --monitor" wasn't it, nor was smartd as I thought at one point. I honestly don't know what was triggering it, except maybe disk access. The fact that backups were running at the same time as the sync seemed to make it happen faster; that's the best I've got at this point.
> What sort of hardware do you have? x86? SMP or uni-processor? > Also, exactly what kernel are you running?
rlpowell@chain> uname -a Linux chain.digitalkingdom.org 2.6.23.1-dk3 #4 SMP Mon Feb 4 06:14:44 PST 2008 x86_64 GNU/Linux rlpowell@chain> cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 15 model : 39 model name : AMD Athlon(tm) 64 Processor 3700+ stepping : 1 cpu MHz : 2210.251 cache size : 1024 KB fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflu t fxsr_opt lm 3dnowext 3dnow up rep_good pni lahf_lm bogomips : 4422.66 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual power management: ts fid vid ttp tm stc
> I might see if I can reproduce it... so if you can send me the > broken .config, that might help too.
http://teddyb.org/~rlpowell/media/regular/config-2.6.23.1-dk2.txt
-Robin
| |