netdev - Re: Multicast packet loss

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Message-ID: <49DBB2BA.1010100@athenacr.com>
Date:	Tue, 07 Apr 2009 16:08:26 -0400
From:	Brian Bloniarz <bmb@...enacr.com>
To:	Eric Dumazet <dada1@...mosbay.com>
CC:	David Miller <davem@...emloft.net>, kchang@...enacr.com,
	netdev@...r.kernel.org, cl@...ux-foundation.org
Subject: Re: Multicast packet loss

Eric Dumazet wrote:
 > Brian Bloniarz a écrit :
 >> We've been experimenting with this softirq-delay patch in production, and
 >> have seen some hard-to-reproduce crashes. We finally managed to capture a
 >> kexec crashdump this morning.
 >
 > Pointer being null might tell us that we managed to call inet_def_readable()
 > without socket lock hold...

False alarm -- I think I did the backport to 2.6.24 incorrectly. 2.6.24 was
before the UDP receive path started taking the socket lock, so
inet_def_readable's assumption doesn't hold.

Sorry to waste everyone's time.

Thanks,
Brian Bloniarz
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