[tor-bugs] #29527 [Core Tor/Tor]: Division by zero: undefined behaviour in circuitpadding/circuitpadding_sample_distribution test

["Tor Bug Tracker & Wiki" <blackhole@xxxxxxxxxxxxxx>]

#29527: Division by zero: undefined behaviour in
circuitpadding/circuitpadding_sample_distribution test
------------------------------+--------------------------------
     Reporter:  teor          |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.4.0.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  regression, tor-ci
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
------------------------------+--------------------------------
 When running the tor unit tests on macOS with `--enable-expensive-
 hardening`, I get the following error:
 {{{
 circuitpadding/circuitpadding_sample_distribution: [forking]
 ../src/lib/math/prob_distr.c:1311:17: runtime error: division by zero
 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
 ../src/lib/math/prob_distr.c:1311:17 in
 ../src/lib/math/prob_distr.c:1219:49: runtime error: division by zero
 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
 ../src/lib/math/prob_distr.c:1219:49 in
 OK
 }}}

 My full configure command-line is:
 {{{
 configure --disable-asciidoc --with-libevent-dir=/usr/local --with-
 openssl-dir=/usr/local/opt/openssl --enable-lzma --enable-zstd --enable-
 libscrypt CC=clang --enable-gcc-warnings --enable-expensive-hardening
 PKG_CONFIG_PATH=/usr/local/lib/pkgconfig:/usr/local/share/pkgconfig
 }}}

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29527>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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