Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: Bug in workqueues [was: Usb devices randomly aren't detected with 2.6.28-rc1-git1] | Date | Sun, 26 Oct 2008 18:55:46 +0100 |
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On Sunday, 26 of October 2008, Alan Stern wrote: > This is no longer a USB issue, so I'm asking for help from the general > kernel community. Background can be found in Bugzilla #11853. > > On Sun, 26 Oct 2008, Mikko C. wrote: > > > Mikko C. ha scritto: > > > Alan Stern ha scritto: > > >> > > >> I don't see anything in there that looks particularly suspicious. > > >> The nature of your errors suggests that the default workqueue has > > >> crashed or hung, but it shows up okay in the dump. Are you sure this > > >> dump was made when the devices failed to appear? > > >> > > >> > > > > > > Yes, I'm 100% sure. > > > > > >> What happens when you try to rmmod the ALSA modules? Does rmmod > > >> crash with an error or does it hang? If it hangs, can you get > > >> another task dump showing the hanging process? > > >> > > > > > > Whenever I try rmmoding something, it hangs (no crash) and I'm not > > > able to do anything, beside moving the mouse. > > > I posted here: http://marc.info/?l=linux-kernel&m=122502213503239&w=4 > > > but that's probably not enough, so I will try getting a full dump. > > > > > Here it is: http://bugzilla.kernel.org/attachment.cgi?id=18452&action=view > > The task dump shows rmmod waiting for flush_workqueue(). But the > events/0 task doesn't appear to be hung, and the task dump taken before > running rmmod shows events/0 doing something different. > > So apparently flush_workqueue() isn't working.
Let's make that more visible (adding CCs). :-)
Thanks, Rafael
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