netdev - Re: data received but not detected

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]

Message-ID: <20080620172513.GA16673@2ka.mipt.ru>
Date:	Fri, 20 Jun 2008 21:25:14 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Travis Stratman <tstratman@...cinc.com>
Cc:	netdev@...r.kernel.org
Subject: Re: data received but not detected

On Fri, Jun 20, 2008 at 12:10:59PM -0500, Travis Stratman (tstratman@...cinc.com) wrote:
> Initially the application was just using a blocking recvfrom() call. I
> changed to poll() and non-blocking recvfrom (MSG_DONTWAIT) today, and
> poll() always times out when the lockup occurs. I also tried using an

Can you confirm that IPSTATS_MIB_INRECEIVES MIB does not increase when
packets are sent to the frozen machine, but userspace does not receive
it?

Please also clarify this bit again: you see packets in tcpdump running
on receiving (frozen) host, but do not see them in userspace? After this
freeze happend system recvmsg/poll calls do not respond until some
activity on NIC happend? I.e. recv/poll 'unfreeze' only when something
is received (arp, icmp reply) or after sending too?

-- 
	Evgeniy Polyakov
--
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