On Mar 24, 2013, at 02:35, Dimitry Andric <d...@freebsd.org> wrote: > Author: dim > Date: Sun Mar 24 01:35:37 2013 > New Revision: 248672 > URL: http://svnweb.freebsd.org/changeset/base/248672 > > Log: > Compile contrib/tzcode/stdtime/localtime.c with -fwrapv, since it relies > on signed integer overflow wrapping. Otherwise mktime(3) and timegm(3) > can hang, in case the timestamp passed in struct tm is not representable > in a time_t. Specifically, any timestamp after 2038-01-19 03:14:07, in > combination with a 32-bit time_t.
I first noticed this when Squid on a i386 machine started to hang every now and then, and started consuming 100% CPU in such cases. After rebuilding Squid with debug info, I found it hung in timegm(3), because some web servers apparently like to pass Last-Modified dates of "Fri, 31 Dec 9999 23:59:59 GMT", most likely to prevent caching. Note this is not an issue on amd64, since time_t is 64-bit there, so even a struct tm with tm_year=INT_MAX would work with mktime(3) and timegm(). _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
