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From: Bruce M Simpson <bms@FreeBSD.org>
Date: Tue, 17 Mar 2009 14:41:54 +0000 (UTC)
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Subject: cvs commit: src/sys/netinet igmp.c in.c in_mcast.c
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bms         2009-03-17 14:41:54 UTC

  FreeBSD src repository

  Modified files:
    sys/netinet          igmp.c in.c in_mcast.c 
  Log:
  SVN rev 189931 on 2009-03-17 14:41:54Z by bms
  
  Deal with the case where ifma_protospec may be NULL, during
  any IPv4 multicast operations which reference it.
  
  There is a potential race because ifma_protospec is set to NULL
  when we discover the underlying ifnet has gone away. This write
  is not covered by the IF_ADDR_LOCK, and it's difficult to widen
  its scope without making it a recursive lock. It isn't clear why
  this manifests more quickly with 802.11 interfaces, but does not
  seem to manifest at all with wired interfaces.
  
  With this change, the 802.11 related panics reported by sam@
  and cokane@ should go away. It is not the right fix, that requires
  more thought before 8.0.
  
  Idea from:      sam
  Tested by:      cokane
  
  Revision  Changes    Path
  1.64      +20 -5     src/sys/netinet/igmp.c
  1.124     +8 -1      src/sys/netinet/in.c
  1.18      +9 -0      src/sys/netinet/in_mcast.c