linux-ext4 - [Bug 25832] kernel crashes upon resume if usb devices are removed when suspended

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Date:	Thu, 24 Mar 2011 23:06:07 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 25832] kernel crashes upon resume if usb devices are removed
 when suspended

https://bugzilla.kernel.org/show_bug.cgi?id=25832

--- Comment #50 from rocko <rockorequin@...mail.com>  2011-03-24 23:06:05 ---
For a time I thought I had tracked the problem down to a single 500 GB ext4
hard drive, because it became possible to able to reliably and quickly
reproduce the crash in my VM by simply simulating USB plug/unplug - it was
crashing on the third or fourth simulated unplug. Then after I ran fsck on the
drive it was much harder to reproduce the crash (I didn't manage to reproduce
it in ten separate attempts, each with hundreds of plugs/unplugs). 

I removed the drive completely from the system and had no crashes for over a
week, until this morning when 2.6.38.1 crashed upon resume (of course after I
had removed the drives during suspend).

Is it possible something in the ext4 drivers would try to access a removed
drive that is has some sort of misconfiguration (ie one that is fixed by an
fsck) and cause the crash? ie Seeing as how an fsck made the problem apparently
'go away' for a while? It would explain why more drives increase the chances of
a crash.

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