From: Alan Stern <stern@rowland.harvard.edu>
To: Alex Riesen <raa.lkml@gmail.com>
Cc: linux-usb@vger.kernel.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: USB device cannot be reconnected and khubd "blocked for more than 120 seconds"
Date: Sat, 12 Jan 2013 12:37:33 -0500 (EST) [thread overview]
Message-ID: <Pine.LNX.4.44L0.1301121232510.32458-100000@netrider.rowland.org> (raw)
In-Reply-To: <CALxABCau65Zm6qWQCgH+2_4SkojxFPbwwGwytCsiWyyq8bwnRw@mail.gmail.com>
On Sat, 12 Jan 2013, Alex Riesen wrote:
> On Fri, Jan 11, 2013 at 10:04 PM, Alex Riesen <raa.lkml@gmail.com> wrote:
> > Hi,
> >
> > the USB stick (an Cruzer Titanium 2GB) was not recognized at any of
> > the USB ports of this system (an System76 lemu4 laptop, XHCI device)
> > after it was removed. If I attempt to insert it again in any of the
> > ports (one of the two USB3, or the USB2) the led on the stick lights
> > up shortly and if off again. There is no media detection messages in
> > the dmesg output, only that from the first time:
To make testing simpler, use only the USB-2 ports. The xHCI driver is
not as mature as the EHCI driver.
> > usb 1-1.2: new high-speed USB device number 3 using ehci-pci
> > usb 1-1.2: New USB device found, idVendor=0781, idProduct=5408
> > usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
> > usb 1-1.2: Product: U3 Titanium
> > usb 1-1.2: Manufacturer: SanDisk Corporation
> > usb 1-1.2: SerialNumber: 0000187A3A60F1E9
> > scsi6 : usb-storage 1-1.2:1.0
> > io scheduler deadline registered (default)
> > usb 1-1.2: USB disconnect, device number 3
> >
> > The kernel is v3.8-rc3. I never had this problem in 3.7. I could almost
> > reproduce the problem later in a simplified setup (init=/bin/bash) on
> > USB3 ports by inserting and removing the stick quickly. Almost - because
> > the USB3 ports recovered after some time, while the USB2 port never
> > experienced the problem.
For testing, use a kernel with CONFIG_USB_DEBUG and CONFIG_PRINTK_TIME
enabled. Do the following:
After a normal boot, run "dmesg -C" to clear the log buffer.
Then plug in the stick. After a couple of seconds, type Alt-SysRq-W.
Then unplug the stick. After a couple of seconds, type Alt-SysRq-W
again.
Then collect the output from dmesg and post it.
> One more detail: I usually use the "noop" elevator. That time it was
> the "deadline". And I just reproduced it easily with "deadline".
I doubt the elevator has anything to do with this.
Alan Stern
next prev parent reply other threads:[~2013-01-12 17:37 UTC|newest]
Thread overview: 93+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-11 21:04 USB device cannot be reconnected and khubd "blocked for more than 120 seconds" Alex Riesen
2013-01-12 7:48 ` Alex Riesen
2013-01-12 9:18 ` Lan Tianyu
2013-01-12 17:37 ` Alan Stern [this message]
2013-01-12 19:39 ` Alex Riesen
2013-01-12 20:33 ` Alex Riesen
2013-01-12 22:52 ` Alan Stern
2013-01-13 12:09 ` Alex Riesen
2013-01-13 16:56 ` Alan Stern
2013-01-13 17:42 ` Alex Riesen
2013-01-13 19:16 ` Oliver Neukum
2013-01-14 2:39 ` Alan Stern
2013-01-14 16:43 ` Alex Riesen
2013-01-14 3:47 ` Ming Lei
2013-01-14 7:15 ` Ming Lei
2013-01-14 17:30 ` Linus Torvalds
2013-01-14 18:04 ` Alan Stern
2013-01-14 18:34 ` Linus Torvalds
2013-01-15 1:53 ` Ming Lei
2013-01-15 6:23 ` Ming Lei
2013-01-15 17:36 ` Linus Torvalds
2013-01-15 18:18 ` Linus Torvalds
2013-01-15 23:17 ` Tejun Heo
2013-01-15 18:20 ` Alan Stern
2013-01-15 18:39 ` Tejun Heo
2013-01-15 18:32 ` Tejun Heo
2013-01-15 20:18 ` Linus Torvalds
2013-01-15 23:50 ` Tejun Heo
2013-01-16 0:25 ` Arjan van de Ven
2013-01-16 0:35 ` Tejun Heo
2013-01-16 4:01 ` Alan Stern
2013-01-16 16:12 ` Tejun Heo
2013-01-16 17:01 ` Alan Stern
2013-01-16 17:37 ` Tejun Heo
2013-01-16 17:51 ` Alan Stern
2013-01-16 0:36 ` Linus Torvalds
2013-01-16 0:40 ` Linus Torvalds
2013-01-16 2:52 ` [PATCH] module, async: async_synchronize_full() on module init iff async is used Tejun Heo
2013-01-16 3:00 ` Linus Torvalds
2013-01-16 3:25 ` Tejun Heo
2013-01-16 3:37 ` Linus Torvalds
2013-01-16 16:22 ` Arjan van de Ven
2013-01-16 16:48 ` Tejun Heo
2013-01-16 17:03 ` Arjan van de Ven
2013-01-16 17:06 ` Linus Torvalds
2013-01-16 21:30 ` [PATCH 1/2] init, block: try to load default elevator module early during boot Tejun Heo
2013-01-17 18:05 ` Linus Torvalds
2013-01-17 18:38 ` Tejun Heo
2013-01-17 18:46 ` Linus Torvalds
2013-01-17 18:59 ` Tejun Heo
2013-01-17 19:00 ` Linus Torvalds
2013-01-18 1:24 ` [PATCH 1/3] workqueue: set PF_WQ_WORKER on rescuers Tejun Heo
2013-01-18 1:25 ` [PATCH 2/3] workqueue, async: implement work/async_current_func() Tejun Heo
2013-01-18 2:47 ` Linus Torvalds
2013-01-18 2:59 ` Tejun Heo
2013-01-18 3:04 ` Tejun Heo
2013-01-18 3:18 ` Linus Torvalds
2013-01-18 3:47 ` Tejun Heo
2013-01-18 22:08 ` [PATCH 1/5] workqueue: set PF_WQ_WORKER on rescuers Tejun Heo
2013-01-18 22:10 ` [PATCH 2/5] workqueue: rename kernel/workqueue_sched.h to kernel/workqueue_internal.h Tejun Heo
2013-01-18 22:11 ` [PATCH 3/5] workqueue: move struct worker definition to workqueue_internal.h Tejun Heo
2013-01-18 22:11 ` [PATCH 4/5] workqueue: implement current_is_async() Tejun Heo
2013-01-18 22:12 ` [PATCH 5/5] async, kmod: warn on synchronous request_module() from async workers Tejun Heo
2022-06-23 5:25 ` Saravana Kannan
2013-01-18 1:27 ` [PATCH 3/3] " Tejun Heo
2013-01-23 0:53 ` [PATCH v2 1/2] init, block: try to load default elevator module early during boot Tejun Heo
2013-01-16 21:31 ` [PATCH 2/2] block: don't request module during elevator init Tejun Heo
2013-01-23 0:51 ` [PATCH v2 " Tejun Heo
2013-01-16 3:30 ` [PATCH] module, async: async_synchronize_full() on module init iff async is used Ming Lei
2013-01-16 4:24 ` Rusty Russell
2013-01-16 11:36 ` Alex Riesen
2013-08-12 7:04 ` [3.8-rc3 -> 3.8-rc4 regression] " Jonathan Nieder
2013-08-12 15:09 ` Tejun Heo
2013-11-26 21:29 ` Josh Hunt
2013-11-26 21:53 ` Linus Torvalds
2013-11-26 22:12 ` Josh Hunt
2013-11-26 22:29 ` Tejun Heo
2013-12-03 14:28 ` Josh Hunt
2013-12-03 15:19 ` Tejun Heo
2013-12-04 23:01 ` Josh Hunt
2013-12-04 23:12 ` Tejun Heo
2013-11-26 22:30 ` Linus Torvalds
2013-01-16 0:44 ` USB device cannot be reconnected and khubd "blocked for more than 120 seconds" Tejun Heo
2013-01-16 17:19 ` [PATCH] async: fix __lowest_in_progress() Tejun Heo
2013-01-17 18:16 ` Linus Torvalds
2013-01-17 18:50 ` Tejun Heo
2013-01-23 0:15 ` [PATCH v2] " Tejun Heo
2013-01-23 0:22 ` Linus Torvalds
2013-01-16 3:05 ` USB device cannot be reconnected and khubd "blocked for more than 120 seconds" Ming Lei
2013-01-16 4:14 ` Linus Torvalds
2013-01-14 8:22 ` Oliver Neukum
2013-01-14 8:40 ` Ming Lei
2013-01-12 19:56 ` Alex Riesen
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