Subject: Re: Multicast packet loss

From: Brian Bloniarz <[email-masked]>
Date: Tue, 07 Apr 2009 16:08:26 -0400

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