[tor-bugs] #21648 [Core Tor/Tor]: prop140: Caches generate diffs as appropriate

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#21648: prop140: Caches generate diffs as appropriate
---------------------------------------+-----------------------------------
 Reporter:  nickm                      |          Owner:  nickm
     Type:  defect                     |         Status:  merge_ready
 Priority:  Medium                     |      Milestone:  Tor:
                                       |  0.3.1.x-final
Component:  Core Tor/Tor               |        Version:
 Severity:  Normal                     |     Resolution:
 Keywords:  prop140 TorCoreTeam201704  |  Actual Points:  5
Parent ID:  #13339                     |         Points:  2
 Reviewer:                             |        Sponsor:  Sponsor4
---------------------------------------+-----------------------------------

Comment (by nickm):

 Interesting.  I tried disabling threading in consdiffmgr and I got:

 {{{
 ============================================================ T= 1493386136
 Tor 0.3.1.0-alpha-dev (git-00a12337ff068d47) died: Caught signal 11
 /home/nickm/src/tor/src/or/tor(+0x159d99)[0x555d3f1f8d99]
 /home/nickm/src/tor/src/or/tor(config_line_find+0x30)[0x555d3f1fdb00]
 /home/nickm/src/tor/src/or/tor(config_line_find+0x30)[0x555d3f1fdb00]
 /home/nickm/src/tor/src/or/tor(consensus_cache_entry_get_value+0x17)[0x555d3f1f1417]
 /home/nickm/src/tor/src/or/tor(consdiffmgr_rescan+0x152e)[0x555d3f1ab0ae]
 /home/nickm/src/tor/src/or/tor(+0x4bb3f)[0x555d3f0eab3f]
 /home/nickm/src/tor/src/or/tor(+0x1bab78)[0x555d3f259b78]
 /lib64/libevent-2.0.so.5(event_base_loop+0x6a6)[0x7fd846d3a6b6]
 /home/nickm/src/tor/src/or/tor(do_main_loop+0x552)[0x555d3f0e9f62]
 /home/nickm/src/tor/src/or/tor(tor_main+0xf3)[0x555d3f0ec213]
 /home/nickm/src/tor/src/or/tor(main+0x13)[0x555d3f0e7fc3]
 /lib64/libc.so.6(__libc_start_main+0xf1)[0x7fd8455b9401]
 /home/nickm/src/tor/src/or/tor(_start+0x2a)[0x555d3f0e7eaa]
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21648#comment:14>
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