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From: Mathias Nyman <mathias.nyman@linux.intel.com>
To: Ross Zwisler <zwisler@google.com>
Cc: Andrzej Pietrasiewicz <andrzej.p@collabora.com>,
	"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
	"kernel@collabora.com" <kernel@collabora.com>
Subject: Re: xhci problem -> general protection fault
Date: Wed, 9 Dec 2020 15:11:14 +0200
Message-ID: <068b49cd-4afa-7adb-572b-634b1728744d@linux.intel.com> (raw)
In-Reply-To: <X8+22DeNDn1A7X+N@google.com>

On 8.12.2020 19.24, Ross Zwisler wrote:
> On Fri, Dec 04, 2020 at 08:07:30PM +0200, Mathias Nyman wrote:
> <>
> 
> Here are some logs when running with that commit:
> 
> https://gist.github.com/rzwisler/17923c9dedf2b914254eadd1cd294a4c
> 
> I think we only consistently get the clean failure case with the dequeue
> pointer being 0 if CONFIG_INTEL_IOMMU_DEFAULT_ON=y.
> 
> If that option is set to 'n', we get the same failure where the xHCI
> controller totally dies (log "CONFIG_INTEL_IOMMU_DEFAULT_ON=n" in the gist).
> 
> With CONFIG_INTEL_IOMMU_DEFAULT_ON=y we do seem to live through multiple
> errors, but as soon as I try to use the device normally afterwards it seems to
> spin forever with these messages:
> 
> xhci_hcd 0000:00:14.0: Looking for event-dma 00000000fff0a330 trb-start 00000000f8884000 trb-end 0000000000000000 seg-start 00000000f8884000 seg-end 00000000f8884ff0
> 
> Are you able to reproduce this with Andrzej's bulk-cancel script?  I think you
> probably just need a device which accepts bulk transfer commands?  In my most
> recent reproductions my servo hardware wasn't even attached to a device, so I
> don't really think it's doing anything except sitting there and receiving
> BULK_IN commands.   I'm doing this to two devices simultaneously.
> 

I was testing with Andrzej's script against a g_zero gadget.
I could  trigger many similar issues as those he reported, but not this
dequeue issue you see.

The rewrite resolved all issues I saw. Script was running without issues
over night. (tested against both USB2 and USB3).

I haven't tried with two devices simultaneously, I could try that.

Could you share more details about the system you have, what xhci
controller do you have?

Thanks
-Mathias 


  reply index

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-17 15:30 Andrzej Pietrasiewicz
2020-09-18 10:50 ` Mathias Nyman
2020-09-18 14:20   ` Andrzej Pietrasiewicz
2020-09-25 13:40     ` Mathias Nyman
2020-09-25 21:05       ` Ross Zwisler
2020-09-28 13:32         ` Andrzej Pietrasiewicz
2020-09-29  7:13           ` Mathias Nyman
2020-10-01 14:13             ` Andrzej Pietrasiewicz
2020-09-28 22:35         ` Mathias Nyman
2020-10-01 16:43           ` zwisler
2020-10-12 19:20             ` Mathias Nyman
2020-10-12 21:53               ` zwisler
2020-10-13  7:49                 ` Mathias Nyman
2020-10-13  8:29                   ` Andrzej Pietrasiewicz
2020-10-13 16:44                     ` zwisler
2020-11-19 16:52                   ` Ross Zwisler
2020-11-23 15:06                     ` Mathias Nyman
2020-12-02 22:59                       ` Ross Zwisler
2020-12-04 18:07                         ` Mathias Nyman
2020-12-08 17:24                           ` Ross Zwisler
2020-12-09 13:11                             ` Mathias Nyman [this message]
2020-12-09 18:54                               ` Ross Zwisler
2020-12-30 12:33                                 ` Mathias Nyman
2021-01-06 18:52                                   ` Ross Zwisler
2021-01-07  8:57                                     ` Mathias Nyman
2021-01-07 16:07                                       ` Ross Zwisler

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