Once I've faced very unusual problem for me.
I started to reboot the remote box and was unable to do it, because kernel thread [pdflush] was in uninterruptible sleep.
For local machines I used to hit SysRq+b, but here it doesn't work for me.
The solution was quite simple. Send SysRq+b via /proc filesystem:
echo b > /proc/sysrq-trigger
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