Re: Anyone else seen this.

In uk.d-i-y The Natural Philosopher <[email protected]> wrote:
> Recently my router (Draytek 2726) has been spontaneously rebooting.
> 
> Examination of the logs show a kernel panic caused by 'attempt to 
> execute an illegal instruction'.
> 
> My assumption, possibly erroneous, is that the actual firmware code is 
> corrupted
> The router is rated only to +45°C but that is the recommended limit for 
> flash memory, and the room temperature has been up towards 40°C. which 
> doesn't leave a great deal of margin for router internal heat production.
> My query is whether anyone else has seen issues with flash memory in the 
> recent hear wave.
> 
> Surely phones get hotter than this?
> 
> Genuinely interested in other's experiences.

You can get bit flips from cosmic rays.  That's a reason servers have ECC
memory:

https://en.wikipedia.org/wiki/Soft_error

Not sure to what extent flash is affected, but many routers nowadays copy
their OS into RAM before execution: 'execute in place' is still possible,
but sometimes they store a compressed image in flash to reduce flash cost
and decompress into RAM on boot.

It could also be a RAM chip on the way out.

Theo