[Bug 1032550] Re: [multipath] failed to get sysfs information
Peter Petrakis
peter.petrakis at canonical.com
Thu Dec 13 15:32:54 UTC 2012
hmm, try this.
kernel.panic_on_oops = 0
kernel.softlockup_panic = 0
kernel.unknown_nmi_panic = 0
kernel.panic_on_unrecovered_nmi = 0
kernel.panic_on_io_nmi = 0
kernel.hung_task_panic = 0
Make sure these are all set to 1 in /etc/sysctl.conf and then run sysctl
-p
Also, lets configure ftrace, see if we get lucky and can catch the deadlock
as it happens.
[as root]
cd /sys/kernel/debug/tracing
echo function > current_tracer
echo 16000 > buffer_size_kb
echo "scsi_*" >> set_ftrace_filter
echo "fc_*" >> set_ftrace_filter
When the kernel crashes, I'll be able to retrieve this buffer from the
dump
Should none of the dump triggers work, then just watch it and trigger it yourself.
# echo c > /proc/sysrq-trigger
The hung multipath -v0 processes are usually spawned on behalf of udev events.
Before you begin the test, please record the current dm map (dmsetup table -v)
and the output of (lsscsi -lv) so I have a point of reference. Thanks.
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Title:
[multipath] failed to get sysfs information
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