So this is being triggered by a drive which takes removable media. It
is hard to tell the exact event order due to the way they are processed
these days. I would therefore first like to confirm that these events
arn't being reciprically triggered by udev responses. Could you wrap up
the two
All the above info was provided at http://lucifer.0c3.net/~adconrad/apw/
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https://bugs.launchpad.net/bugs/926923
Title:
udev occasionally goes into infinite loop
To manage
Ok I have put some debug into the kernel and built you a test kernel.
Could you install the kernel below and reproduce the issue. This
hopefully will emit some clues into dmesg:
http://people.canonical.com/~apw/lp926923-precise/
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Oh, we caught up on IRC about this, but for completeness in the bug
report, here's the dmesg from the debug kernel:
[ 174.426273] APW: isd_check_events: media no longer present -- device changed
[ 174.452796] APW: sd_check_events: m_n_p:: set_media_not_present: media was
present -- device
** Attachment added: udev.monitor
https://bugs.launchpad.net/ubuntu/+source/udev/+bug/926923/+attachment/2715127/+files/udev.monitor
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Title:
** Attachment added: udev.strace
https://bugs.launchpad.net/bugs/926923/+attachment/2715104/+files/udev.strace
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Title:
udev occasionally goes
** Attachment added: /lib/udev/rules.d
https://bugs.launchpad.net/ubuntu/+source/udev/+bug/926923/+attachment/2715132/+files/lib.udev.rules.d.tar
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** Attachment added: /etc/udev/rules.d/
https://bugs.launchpad.net/ubuntu/+source/udev/+bug/926923/+attachment/2715133/+files/etc.udev.rules.d.tar
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As recommended by vorlon, I tested both the following commands:
/lib/udev/scsi_id --export --whitelisted -d /dev/sdb
/lib/udev/ata_id --export /dev/sdb
Both of them trigger the event storm reported above, leading him to
believe it's a kernel issue.
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Since these are the standard udev helpers that are called for all block
devices, and other people aren't reporting issues with change event
storms when running them, I think this is very likely to be a bug in the
kernel driver for this device rather than a bug in udev, yes.
Reassigning to the
And before a bot nags me, I've tested this on a freshly-updated system
with 3.2.0-12-powerpc, and the problem persists.
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Title:
udev occasionally
And linux-image-3.2.0-14-powerpc too. :P
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Title:
udev occasionally goes into infinite loop
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