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Bug#782515: linux-image-3.16.0-4-amd64: kernel BUG at /build/linux-oP9w_T/linux-3.16.7-ckt9/net/ipv4/tcp_output.c:878!



Control: tag -1 - moreinfo

On Mon, 2015-04-13 at 16:36 +0100, Ben Hutchings wrote:
> On Mon, 2015-04-13 at 18:08 +0300, Antti Salmela wrote:
> > Package: src:linux
> > Version: 3.16.7-ckt9-2
> > Followup-For: Bug #782515
> > 
> > It's TCP Fastopen. After I disable it with 'echo 0 > /proc/sys/net/ipv4/tcp_fastopen' I can start system (and chrome) normally.
> > Here's a oops report recorded with netconsole.
> 
> Thanks, so this is clearly unrelated to the graphics driver.
> 
> Is this also reproducible with 3.19 from experimental?  (Note you won't
> be able to build the nvidia driver against that.)

Never mind, I've now been able to reproduce this in a VM:

1. Install Chromium
2. Open <chrome://flags/#enable-tcp-fast-open>
3. Enable the TCP Fast Open feature
4. Restart the browser

For me, the BUG occurs in process context so only the browser process is
killed.  And TCP Fast Open is not used by default in Chromium (at least,
not in the current version in Debian unstable).  But we definitely ought
to get this fixed.

It isn't reproducible with 3.19 from experimental.

Ben.

-- 
Ben Hutchings
Everything should be made as simple as possible, but not simpler.
                                                           - Albert Einstein

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