On Tue, Sep 01, 2015 at 02:05:30PM +0000, Konstantin Belousov wrote: > Author: kib > Date: Tue Sep 1 14:05:29 2015 > New Revision: 287366 > URL: https://svnweb.freebsd.org/changeset/base/287366 > > Log: > Exit notification for EVFILT_PROC removes knote from the knlist. In > particular, this invalidates the knote kn_link linkage, making the > SLIST_FOREACH() loop accessing undefined values (e.g. trashed by > QUEUE_MACRO_DEBUG). If the knote is freed by other thread when kq > lock is released or when influx is cleared, e.g. by knote_scan() for > kqueue owning the knote, the iteration step would access freed memory. > > Use SLIST_FOREACH_SAFE() to fix iteration. > > Diagnosed by: avg > Tested by: avg, lstewart, pawel > Sponsored by: The FreeBSD Foundation > MFC after: 2 weeks > Thank you! that makes my package builders stable again!
Best regards, Bapt
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