Re: dd hangs when reading large partitions

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Hello

On 1/21/19 11:22 PM, Marc Gonzalez wrote:
> Well, now we know for sure that the clk_scaling_lock is a red herring.
> I applied the patch below, and still the system locked up:
> 
> # dd if=/dev/sde of=/dev/null bs=1M status=progress
> 3892314112 bytes (3.9 GB, 3.6 GiB) copied, 50.0042 s, 77.8 MB/s
> 
> I can't seem to get the RCU stall warning anymore. How can I get
> to the bottom of this issue?
> 

Can you detail the system 'locked up' ?
dd hangs there ? any hung task warning log ?

hang forever or just hang for a relatively long time.

And what is the status of the dd when it hangs ?
Can you take some samples of the /proc/<dd's pid>/status and /proc/<dd's pid>/stack during the hang ?

And also would you please share the dmesg log and config ?

Since always fails with buffered read with fixed bytes,
what is the capacity of your system memory ? 


Thanks
Jianchao



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