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

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Message-Id: <201102040628.p146SOBx001646@demeter1.kernel.org>
Date:	Fri, 4 Feb 2011 06:28:24 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 #7 from rocko <rockorequin@...mail.com>  2011-02-04 06:27:51 ---
Thanks for the feedback. I didn't have CONFIG_DETECT_SOFTLOCKUP enabled, so I
recompiled the kernel with it on. I managed to reproduce the problem but
unfortunately still didn't get anything useful in the logs. The syslog shows
immediately after the wlan reconnected:

Feb  4 14:13:02 pegasus-maverick anacron[6272]: Anacron 2.3 started on
2011-02-04
Feb  4 14:13:02 pegasus-maverick anacron[6272]: Normal exit (0 jobs run)
<hard reset was required here>
Feb  4 14:14:30 pegasus-maverick kernel: imklog 4.2.0, log source = /proc/kmsg
started.

Might the number of USB devices be relevant? I used to have external 4 drives
connected and now only have 3: I managed three suspend/resume cycles without
getting the freeze, but after I attached a fourth drive (NTFS btw, whereas the
others are ext4), the next suspend/resume cycle froze the machine.

Am I right in thinking sysrq requires me to connect over the network? The
problem with that is that I can only reproduce this reliably after a
suspend/resume cycle, and of course the network connection is lost during
suspend and the machine typically locks up so quickly that I don't have time to
establish a new connection.

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