#900399 - memtest86+: very probably kills system controller on Lenovo Thinkpad T500 laptop - Debian Bug report logs
- It seems be the case than either BIOS do not list memory-mapped EC
registers as a reserved memory area, or memtest86+ fails to process this
reservation correctly.

- The pattern of the memory writes by memtest is (unfortunately) 100%
compatible with PMH internal register access protocol.

So, we have to seriously consider the possibility that two laptops died
at the same time just by a coincidence.
10 hours ago
PostgreSQL's fsync() surprise [LWN.net]
what freebsd appears to do is to just clear the error *and* mark the buffer as dirty again. So the error will be hit again and again (unless the device is gone):
unix  postgres 
7 weeks ago
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