netdev - Re: [PATCH net] netconsole: Check for carrier before calling netpoll_send

lists.openwall.net		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 linux-cve-announce 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:	Tue, 11 Aug 2015 15:53:18 +1000
From:	Jonathan Maxwell <jmaxwell37@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jon Maxwell <jmaxwell@...hat.com>
Subject: Re: [PATCH net] netconsole: Check for carrier before calling netpoll_send_udp()

> What if the carrier check passes, and then the chip reset starts on
> another cpu?  You'll have the same problem.

Okay, let me see if I can come up with a better way to mitigate this.

On Tue, Aug 11, 2015 at 2:22 PM, David Miller <davem@...emloft.net> wrote:
> From: Jon Maxwell <jmaxwell37@...il.com>
> Date: Tue, 11 Aug 2015 11:32:26 +1000
>
>> We have seen a few crashes recently where a NIC is getting
>> reset for some reason and then the driver or another module calls
>> printk() which invokes netconsole. Netconsole then calls the
>> adapter specific poll routine via netpoll which crashes because
>> the adapter is resetting and its structures are being reinitialized.
>
> This isn't a fix.
>
> What if the carrier check passes, and then the chip reset starts on
> another cpu?  You'll have the same problem.
>
> I'm not applying this, sorry.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html