It appears to be the kernel bug. Sort of. I've bisected the kernel to commit
ab8fabd46f811d5153d8a0cd2fac9a0d41fb593d. There's a discussion of this problem
in this thread:
https://groups.google.com/forum/#!topic/linux.kernel/Jc69VRli3k0
This seems basically WONTFIX from linux side. But a workaro
In fact, it seems enough to write any value, even default+1, i.e. 21 to
/proc/sys/vm/dirty_ratio to trigger the bug.
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https://bugs.launchpad.net/bugs/1342341
Ti
This appears to be because upowerd calls `pm-powersave false`, which in turn
activates /usr/lib/pm-utils/power.d/laptop-mode, which writes 10 and 5 to
/proc/sys/vm/dirty_ratio and /proc/sys/vm/dirty_background_ratio, respectively,
replacing default 20 and 10.
Commenting this line in laptop-mode
Also, writing back the default values to the /proc/sys/vm/... files
doesn't fix the problem — so far only reboot with avoiding writing bad
values helped.
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