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raspberrypi / linux

Kernel source tree for Raspberry Pi-provided kernel builds. Issues unrelated to the linux kernel should be posted on the community forum at https://forums.raspberrypi.com/
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Kernel/modules 3.10.25+ possible bug report #511

Closed ghost closed 10 years ago

ghost commented 10 years ago

Hello everybody,

On January 17th I made full update and upgrade to the system running on Raspberry Pi v2, my server and gateway.

Before I started I had perfect bi-directional connectivity betwen my desktop PC and RaspberryPi in many aspects. (both appliances hooked to TL-MR3420 router!)

I'm running pretty complex set of software on RaspberryPi: full blown LAMP server, Dovecot, RoundCube, WebMin and some ham radio software working as AMPRNet gateway.

Update/Upgrade process included some packages, linux kernel with kernel modules and RaspberryPi bootloader. After upgrade process was completed but before reboot with new kernel, system still was running O.K. The old kernel was 3.6.11+ and the new one is 3.10.25+

After reboot took place I was simply taken aback. I lost possibility to use IMAP/SMTP servers on Raspberry Pi, i.e. I couldn't receive or send e-mails by means of Evolution.

Additionally I observed exactly the same problem on my Sony Xperia Z1 smartphone - it wasn't possible to send or receive e-mails through RaspberryPi's SMTP/IMAP.

Unexpectedly to my astonishment I discovered that after I send just one ping packet from desktop PC to RaspberryPi server I can receive and send e-mails!!! But, also very strange, for a limited period of time. If the idle time was longer than 5 minutes, again it wasn't possible to use RaspberyPi's SMTP/IMAP! This did not applied to Sony Xperia Z1, unfortunately.

Another observation, absolutely strange too, I couldn't open from desktop PC my www site neither on linux.sp2lob.ampr.org nor on sp2lob.no-ip.org addresses!

Please note that except above mentioned issue it was possible to telnet or ssh from my desktop PC to RaspberryPi (both wired to TL-MR3420 router).

It was more than I can bear! Something is badly broken. Quick decision: let's go back to 3.6.11+ kernel!!! Now I'm back on 3.6.11+ kernel, running as before - O.K!!!

Where's the troublemaker?

Best regards. Tom

popcornmix commented 10 years ago

Can you try with latest 3.12.23 kernel?

ghost commented 10 years ago

Thank you for suggestion... Investigated problem by myself and last not least found troublemaker. My problem wasn't because of kernel bug, but it was caused by some changes in kernel modules. It was directly connected with the way tunl0 interface was configured. In kernel 3.10.25+ it is necessary to EXPLICITLY specify MTU value!!!

So, I close issue #511 now. Thank you again. Tom