lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date:	Mon, 17 Dec 2012 14:52:13 -0500
From:	Benjamin LaHaise <>
To:	Eric Dumazet <>
Subject: Re: 3.6.10 tcp crash - net/ipv4/tcp.c:1667 & tcp.c:1655

On Mon, Dec 17, 2012 at 11:34:13AM -0800, Eric Dumazet wrote:
> On Mon, 2012-12-17 at 12:41 -0500, Benjamin LaHaise wrote:
> > Hi folks,
> > 
> > I just hit the following crash with Fedora's 3.6.10-2.fc17 kernel.  I don't 
> > have time to debug this myself at the moment, but can certainly test patches 
> > or provide more info as needed.  I wasn't doing anything unusual at the time, 
> > just reading email/web browsing.  I believe the network driver in use was 
> > ipheth for tethering to an iPhone 4S over USB (the other driver being used 
> > intermittently on this laptop is iwlwifi).  Any ideas?
> I see nothing really wrong on ipheth side.
> I would be nice to know which driver is really in use when you have a
> panic, as its probably a driver issue.

I double checked the logs, and the wifi was disabled at the time (~30 
minutes beforehand), so it had to be ipheth.  The warnings were the last 
thing that made it to disk before the machine hung hard, so there may have 
been a more serious crash after the warning that did not get logged.

One thing I have observed with tethering is that the MTU handling is munged 
by the network in interesting ways.  Although the device claims to be 
ethernet with a 1500 byte MTU, a 'ping -s' works only up to 996 (with no 
effect trying the various -M options).  A number of website are broken by 
this, as the network doesn't seem to send ICMP frag needed errors to my 
tethered host (but I haven't traced this behaviour from both ends yet).  
Things do work for 1500 byte packets to the gateway IP, but that seems 
to be local to the phone.

"Thought is the essence of where you are now."
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to
More majordomo info at

Powered by blists - more mailing lists