On May 14, 2014, at 2:55 PM, Marc MERLIN <m...@merlins.org> wrote:

> INFO: task btrfs:13329 blocked for more than 120 seconds.

Pretty much anytime blocked for more than 120 seconds is reported, devs ask for 
sysrq-w. Typically that translates into three steps:

echo 1 > /proc/sys/kernel/sysrq
echo w > /proc/sysrq-trigger
dmesg

https://www.kernel.org/doc/Documentation/sysrq.txt

Chris Murphy

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