Re: [PATCH 0/3] Fix USB deadlock caused by SCSI error handling

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On 04/10/2014 12:58 PM, Andreas Reis wrote:
> That patch appears to work in preventing the crashes, judged on one
> repeated appearance of the bug.
> 
> dmesg had the usual
> [  215.229903] usb 4-2: usb_disable_lpm called, do nothing
> [  215.336941] usb 4-2: reset SuperSpeed USB device number 3 using
> xhci_hcd
> [  215.350296] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called
> with disabled ep ffff880427b829c0
> [  215.350305] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called
> with disabled ep ffff880427b82a08
> [  215.350621] usb 4-2: usb_enable_lpm called, do nothing
> 
> repeated five times, followed by one
> [  282.795801] sd 8:0:0:0: Device offlined - not ready after error
> recovery
> 
> and then as often as something tried to read from it:
> [  295.585472] sd 8:0:0:0: rejecting I/O to offline device
> 
> The stick could then be properly un- and remounted (the latter if it
> had been physically replugged) without issue — for the bug to
> reoccur after one to three minutes. I tried this three times, no
> dmesg difference except the ep addresses varied on two of that.
> 
Was this just that patch you've tested with or the entire patch series?

If the latter, Alan, is this the expected outcome?
I would've thought the error recover should _not_ run into
offlining devices here, but rather the device should be recovered
eventually.

Andreas, can you test with the entire patch series and enable
'scsi_logging_level -s -E 5' prior to running the tests?

THX.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@xxxxxxx			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
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