Date: Tue, 25 Jun 2002 15:29:19 -0400 From: Don Bowman <don@sandvine.com> To: 'Jonathan Lemon' <jlemon@flugsvamp.com>, "'freebsd-stable@freebsd.org'" <freebsd-stable@freebsd.org> Subject: RE: panic in syncache/rtfree with 4.6 Message-ID: <FE045D4D9F7AED4CBFF1B3B813C853376765C1@mail.sandvine.com>
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in tcp_syncache.c, it seems that syncache_lookup()
calls need to be protected by splnet()/splx().
For example, in syncache_chkrst(), the code does:
sc = syncache_lookup(...)
if (sc == NULL)
return
if (sc->...)
syncache_drop(sc, ...)
however, if the timer wakes up between the lookup() and the
rest of the function, will a crash not occur?
Shouldn't this be protected from before the lookup until
after the last use of sc?
--don
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