[tor-bugs] #32868 [Core Tor/Tor]: crash: Assertion node->rs->is_possible_guard failed in compute_weighted_bandwidths at

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#32868: crash:  Assertion node->rs->is_possible_guard failed in
compute_weighted_bandwidths at
--------------------------+------------------------------
 Reporter:  toralf        |          Owner:  (none)
     Type:  defect        |         Status:  new
 Priority:  Medium        |      Component:  Core Tor/Tor
  Version:  Tor: 0.4.2.5  |       Severity:  Normal
 Keywords:                |  Actual Points:
Parent ID:                |         Points:
 Reviewer:                |        Sponsor:
--------------------------+------------------------------
 With
 https://github.com/toralf/torutils/blob/f307866d2149bcd3c95df5269b3b48d051f871e9/info.py
 I monitor the status of my 2 Tor relays. A day before I commented out this
 section in torrc:
 {{{
 #FetchDirInfoEarly 1
 #FetchDirInfoExtraEarly 1
 #FetchUselessDescriptors 1
 #UseMicrodescriptors 0
 #DownloadExtraInfo 1
 }}}
 Now it took 7 minutes to finish (when those config values were set it was
 much faster).

 But more interesting I realized today I crash of one of both Tor relays:
 {{{
 Jan 01 11:12:38.000 [warn] compute_weighted_bandwidths(): Bug: Consensus
 is missing some bandwidths. Using a naive router selection algorithm (on
 Tor 0.4.2.5 )
 Jan 01 11:12:38.000 [err] tor_assertion_failed_(): Bug:
 src/feature/nodelist/node_select.c:723: compute_weighted_bandwidths:
 Assertion node->rs->is_possible_guard failed; aborting. (on Tor 0.4.2.5 )
 Jan 01 11:12:38.000 [err] Bug: Tor 0.4.2.5: Assertion
 node->rs->is_possible_guard failed in compute_weighted_bandwidths at
 src/feature/nodelist/node_select.c:723: . Stack trace: (on Tor 0.4.2.5 )
 Jan 01 11:12:38.000 [err] Bug:     /usr/bin/tor(log_backtrace_impl+0x59)
 [0x55850995e1a9] (on Tor 0.4.2.5 )
 Jan 01 11:12:38.000 [err] Bug:
 /usr/bin/tor(tor_assertion_failed_+0x150) [0x5585099593e0] (on Tor 0.4.2.5
 )
 Jan 01 11:12:38.000 [err] Bug:     /usr/bin/tor(+0x12c474)
 [0x558509896474] (on Tor 0.4.2.5 )
 Jan 01 11:12:38.000 [err] Bug:
 /usr/bin/tor(frac_nodes_with_descriptors+0x73) [0x558509897373] (on Tor
 0.4.2.5 )
 Jan 01 11:12:38.000 [err] Bug:     /usr/bin/tor(+0x12afb2)
 [0x558509894fb2] (on Tor 0.4.2.5 )
 Jan 01 11:12:38.000 [err] Bug:
 /usr/bin/tor(count_loading_descriptors_progress+0x6c) [0x558509895b2c] (on
 Tor 0.4.2.5 )
 Jan 01 11:12:38.000 [err] Bug:
 /usr/bin/tor(connection_dir_reached_eof+0x20e0) [0x558509856f30] (on Tor
 0.4.2.5 )
 Jan 01 11:12:38.000 [err] Bug:
 /usr/bin/tor(connection_handle_read+0x980) [0x5585097d2760] (on Tor
 0.4.2.5 )
 Jan 01 11:12:38.000 [err] Bug:     /usr/bin/tor(+0x6d97c) [0x5585097d797c]
 (on Tor 0.4.2.5 )
 Jan 01 11:12:38.000 [err] Bug:     /usr/lib64/libevent-2.1.so.6(+0x219ca)
 [0x7ffbba3cb9ca] (on Tor 0.4.2.5 )
 Jan 01 11:12:38.000 [err] Bug:
 /usr/lib64/libevent-2.1.so.6(event_base_loop+0x4ef) [0x7ffbba3cc54f] (on
 Tor 0.4.2.5 )
 Jan 01 11:12:38.000 [err] Bug:     /usr/bin/tor(do_main_loop+0xdd)
 [0x5585097d8b2d] (on Tor 0.4.2.5 )
 Jan 01 11:12:38.000 [err] Bug:     /usr/bin/tor(tor_run_main+0x10c5)
 [0x5585097c6855] (on Tor 0.4.2.5 )
 Jan 01 11:12:38.000 [err] Bug:     /usr/bin/tor(tor_main+0x46)
 [0x5585097c4076] (on Tor 0.4.2.5 )
 Jan 01 11:12:38.000 [err] Bug:     /usr/bin/tor(main+0x19)
 [0x5585097c3c49] (on Tor 0.4.2.5 )
 Jan 01 11:12:38.000 [err] Bug:
 /lib64/libc.so.6(__libc_start_main+0xeb) [0x7ffbb9d19eab] (on Tor 0.4.2.5
 )
 Jan 01 11:12:38.000 [err] Bug:     /usr/bin/tor(_start+0x2a)
 [0x5585097c3c9a] (on Tor 0.4.2.5 )
 }}}


 System is a hardened Gentoo Linux running 2 relays. The second is not
 affected.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32868>
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