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  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Mon, 30 Jan 2017 08:47:52 -0800
From:   Vineeth Remanan Pillai <>
To:     Boris Ostrovsky <>,
CC:     David Miller <>, <>,
        Wei Liu <>,
        Paul Durrant <>,
        xen-devel <>
Subject: Re: [PATCH v2] xen-netfront: Fix Rx stall during network stress and

On 01/29/2017 03:09 PM, Boris Ostrovsky wrote:
> There are couple of problems with this patch.
> 1. The 'if' clause now evaluates to true on pretty much every call to 
> xennet_alloc_rx_buffers().
Thanks for catching this. In my testing I did not notice this - mostly 
because of the nature of the workload in my testing.

> 2. It tickles a latent bug during resume where the timer triggers 
> before we re-connect. The trouble is that we now try to dereference 
> queue->rx.sring which is NULL since we disconnect in 
> netfront_resume(). (Curiously, I only observe it with 32-bit guests)
I think we may hit this bug after removing the timer as well. We call 
RING_PUSH_REQUESTS_AND_CHECK_NOTIFY soon after, which also dereference 


Powered by blists - more mailing lists