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From: florin@iucha.net (Florin Iucha)
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Jiri Kosina <jikos@jikos.cz>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-usb-devel@lists.sourceforge.net,
	Adrian Bunk <bunk@stusta.de>,
	Trond Myklebust <trond.myklebust@fys.uio.no>
Subject: Re: heavy nfs[4]] causes fs badness Was: 2.6.20-rc4: known unfixed regressions (v2)
Date: Tue, 23 Jan 2007 21:04:47 -0600	[thread overview]
Message-ID: <20070124030447.GH11860@iucha.net> (raw)
In-Reply-To: <Pine.LNX.4.44L0.0701151055010.15327-100000@netrider.rowland.org>


[-- Attachment #1.1: Type: text/plain, Size: 3355 bytes --]

On Mon, Jan 15, 2007 at 10:58:29AM -0500, Alan Stern wrote:
> On Sun, 14 Jan 2007, Florin Iucha wrote:
> 
> > Jiri and Trond,
> > 
> > On Mon, Jan 15, 2007 at 01:14:09AM +0100, Jiri Kosina wrote:
> > > On Sun, 14 Jan 2007, Florin Iucha wrote:
> > > 
> > > > All the testing was done via a ssh into the workstation.  The console 
> > > > was left as booted into, with the gdm running.  The remote nfs4 
> > > > directory was mounted on "/mnt". After copying the 60+ GB and testing 
> > > > that the keyboard was still functioning, I did not reboot but stayed in 
> > > > the same kernel and pulled the latest git then started bisecting.  
> > > 
> > > Hi Florin,
> > > 
> > > thanks a lot for the testing. Just to verify - what kernel is 'the same 
> > > kernel' mentioned above? (just to isolate whether the problem is really 
> > > somewhere between 2.6.19 and 2.6.20-rc2, as you stated in previous posts, 
> > > or the situation has changed).
> > 
> > This happened with 2.6.19.  It worked last time, but I wanted to test
> > again, to make sure.  This time, it bombed, but half an hour after the 
> > transfer finished.
> > 
> > > > After recompiling, I moved over to the workstation to reboot it, but the 
> > > > keyboard was not functioning ;(
> > > 
> > > So this time the hang occured when the system was idle, not during the 
> > > transfers, right?
> > 
> > Yes it was idle.  Immediately after the transfer finished, the keyboard was
> > still functioning.  It "hang" minutes later, after the first bisected kernel
> > was compiled and installed.
> > 
> > > > I ran "lsusb" and it displayed all the devices. "dmesg" did not show
> > > > any oops, anything for that matter.  I have unplugged the keyboard and
> > > > run "lsusb" again, but it hang.  I ran "ls /mnt" and it hang as well.
> > > > Stracing "lsusb" showed it hang (entered the kernel) at opening the device
> > > > that used to be the keyboard.  Stracing "ls /mnt" showed that it
> > > > hang at "stat(/mnt)".  Both processes were in "D" state.  "ls /root"
> > > > worked without problem, so it appears that crossing mountpoints causes
> > > > some hang in the kernel.
> > > 
> > > Could you please do alt-sysrq-t (or "echo t > /proc/sysrq-trigger" via 
> > > ssh, when your keyboard is dead) to see the calltraces of the processes 
> > > which are stuck inside kernel?
> > > 
> > > You will probably get a lot of output after the sysrq, so please either 
> > > put it somewhere on the web if possible, or just extract the interesting 
> > > processes out of it (mainly the ones which are stuck).
> > 
> > Will do.
> 
> It would be nice to learn exactly why the keyboard stopped working.  Try
> using the usbmon facility (instructions in Documentation/usb/usbmon.txt)
> to see what happens when you type on the dead keyboard.  Be sure to turn
> on CONFIG_USB_DEBUG as well.  And also check /proc/interrupts; each time
> you hit a key the USB controller should get an interrupt.

Attached is the output from usbmon, unfortunately this kernel did not
have CONFIG_USB_DEBUG set.  This is kernel 2.6.20-rc5.

So, the bus sees some traffic when the keyboard is used, but gdm does
not receive any keystrokes.

florin

-- 
Bruce Schneier expects the Spanish Inquisition.
      http://geekz.co.uk/schneierfacts/fact/163

[-- Attachment #1.2: usbmon.1.log --]
[-- Type: text/plain, Size: 16206 bytes --]

ffff81007fe91308 707039742 C Ii:003:01 0 8 = 00002800 00000000
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ffff81007fe91308 734494539 C Ii:003:01 0 8 = 00000e0d 00000000
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ffff81007fe91308 734550536 C Ii:003:01 0 8 = 00000d00 00000000
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ffff81007fe91308 734614533 C Ii:003:01 0 8 = 00000000 00000000
ffff81007fe91308 734614547 S Ii:003:01 -115 8 <
ffff81007fe91308 734638534 C Ii:003:01 0 8 = 00003300 00000000
ffff81007fe91308 734638550 S Ii:003:01 -115 8 <
ffff81007fe91308 734646538 C Ii:003:01 0 8 = 0000330f 00000000
ffff81007fe91308 734646565 S Ii:003:01 -115 8 <
ffff81007fe91308 734686530 C Ii:003:01 0 8 = 0000330f 0e000000
ffff81007fe91308 734686547 S Ii:003:01 -115 8 <
ffff81007fe91308 734734529 C Ii:003:01 0 8 = 0000330f 0e0d0000
ffff81007fe91308 734734545 S Ii:003:01 -115 8 <
ffff81007fe91308 734750527 C Ii:003:01 0 8 = 0000330e 0d000000
ffff81007fe91308 734750543 S Ii:003:01 -115 8 <
ffff81007fe91308 734758527 C Ii:003:01 0 8 = 00000e0d 00000000
ffff81007fe91308 734758541 S Ii:003:01 -115 8 <
ffff81007fe91308 734806525 C Ii:003:01 0 8 = 00000d00 00000000
ffff81007fe91308 734806542 S Ii:003:01 -115 8 <
ffff81007fe91308 734862522 C Ii:003:01 0 8 = 00000d0f 00000000
ffff81007fe91308 734862538 S Ii:003:01 -115 8 <
ffff81007fe91308 734870522 C Ii:003:01 0 8 = 00000d0f 0e000000
ffff81007fe91308 734870538 S Ii:003:01 -115 8 <
ffff81007fe91308 734886521 C Ii:003:01 0 8 = 00000d0f 0e330000
ffff81007fe91308 734886537 S Ii:003:01 -115 8 <
ffff81007fe91308 734894521 C Ii:003:01 0 8 = 00000f0e 33000000
ffff81007fe91308 734894536 S Ii:003:01 -115 8 <
ffff81007fe91308 735006517 C Ii:003:01 0 8 = 00000e33 00000000
ffff81007fe91308 735006531 S Ii:003:01 -115 8 <
ffff81007fe91308 735014515 C Ii:003:01 0 8 = 00000e00 00000000
ffff81007fe91308 735014531 S Ii:003:01 -115 8 <
ffff81007fe91308 735038514 C Ii:003:01 0 8 = 00000000 00000000
ffff81007fe91308 735038529 S Ii:003:01 -115 8 <
ffff81007fe91308 735150510 C Ii:003:01 0 8 = 00002800 00000000
ffff81007fe91308 735150526 S Ii:003:01 -115 8 <
ffff81007fe91308 735246506 C Ii:003:01 0 8 = 00000000 00000000
ffff81007fe91308 735246521 S Ii:003:01 -115 8 <
ffff81007fe91308 735326502 C Ii:003:01 0 8 = 00002800 00000000
ffff81007fe91308 735326518 S Ii:003:01 -115 8 <
ffff81007fe91308 735414500 C Ii:003:01 0 8 = 00000000 00000000
ffff81007fe91308 735414517 S Ii:003:01 -115 8 <
ffff81007fe91308 735470496 C Ii:003:01 0 8 = 00002800 00000000
ffff81007fe91308 735470513 S Ii:003:01 -115 8 <
ffff81007fe91308 735550491 C Ii:003:01 0 8 = 00000000 00000000
ffff81007fe91308 735550506 S Ii:003:01 -115 8 <

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  reply	other threads:[~2007-01-24  3:04 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20070109214431.GH24369@iucha.net>
     [not found] ` <Pine.LNX.4.44L0.0701101052310.3289-100000@iolanthe.rowland.org>
2007-01-14 22:57   ` [linux-usb-devel] " Florin Iucha
2007-01-14 23:58     ` heavy nfs[4]] causes fs badness Was: " Florin Iucha
2007-01-15  0:14       ` Jiri Kosina
2007-01-15  2:02         ` Florin Iucha
2007-01-15 15:58           ` Alan Stern
2007-01-24  3:04             ` Florin Iucha [this message]
2007-01-24 19:07               ` Alan Stern
2007-01-15  0:14       ` Trond Myklebust
2007-01-15  2:11       ` Horst H. von Brand
2007-01-15 15:46         ` Florin Iucha

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