Re: Google sites don't work

[Ivan Krylov]

> Similar problem here, only with Google sites like Gmail, Docs, and
> Chat (via a[n?] university/Google system).

Interesting. Do you see any relevant errors if you press F12 and take a
look at the JavaScript console on the affected pages, compared to the
unaffected pages? What about the Network tab, any failed requests there?

-- 
Best regards,
Ivan

Re: Problems with an X220 potentially related to linux-4.9.0-16-amd64 update

[Ivan Krylov]

Christian, Tomas,

Thanks for your answers! I've been running 4.9.0-15-amd64 for the last
few days and haven't observed anything untoward so far.

I guess the next step would be rebooting into 4.9.0-16-amd64 again to
verify that it's still the kernel version making the difference. I'll
mail my findings in a few days.

-- 
Best regards,
Ivan

Problems with an X220 potentially related to linux-4.9.0-16-amd64 update

[Ivan Krylov]

Hi!

A few days ago I've installed the linux-4.9.0-16-amd64 update on my
Stretch machine, a Lenovo X220 laptop. _After_ that (not yet sure
whether _because_ of that) the system started misbehaving, including:

 - hanging with backtraces on shutdown, once with enough of a working
   kernel for Alt-SysRq-EISUB to work, and once a complete hang
 - files on / suddenly turning out to be damaged (e.g. Firefox starts
   up well in the morning, then, without any updates, crashes in the
   afternoon and keeps crashing on startup; debsums -c shows 2 damaged
   *.so)
 - scary-looking error messages in dmesg, including "general protection
   fault", "swap_free: Bad swap file entry", "BUG: Bad page map in
   process", "BUG: Bad rss-counter state", "Bad pagetable". (Logs
   available if needed.)

I was going to blame this on the RAM or the SSD (the latter had been
bought in 2016), but I cannot get a conclusive proof of either being at
fault. Last night I ran 10 hours of memtest, then booted
linux-4.9.0-15-amd64 with "memtest" parameter added (no errors found
either way), ran everything I could think of (badblocks -n of the SSD
swap partition, `stress` with -c/-i/-m, some computations I usually
work on), but was unable to reproduce any problems.

I also tried hibernating and resuming the laptop, which gave me "Uhhuh.
NMI received for unknown reason 3c on CPU 0". Not sure if it's related
to the current bunch of problems, because I've always been getting it
from time to time, usually after resuming.

Does anyone have any hints on how to diagnose this further?

-- 
Best regards,
Ivan