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[tor-bugs] #24976 [- Select a component]: Bug: src/or/hs_cache.c:628: cache_store_as_client: Non-fatal assertion !(cache_entry->desc->plaintext_data.revision_counter > client_desc->desc->plaintext_data.revision_counter) failed

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Subject: [tor-bugs] #24976 [- Select a component]: Bug: src/or/hs_cache.c:628: cache_store_as_client: Non-fatal assertion !(cache_entry->desc->plaintext_data.revision_counter > client_desc->desc->plaintext_data.revision_counter) failed
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Date: Tue, 23 Jan 2018 13:57:08 -0000
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#24976: Bug: src/or/hs_cache.c:628: cache_store_as_client: Non-fatal assertion
!(cache_entry->desc->plaintext_data.revision_counter >
client_desc->desc->plaintext_data.revision_counter) failed
--------------------------------------+--------------------------------
     Reporter:  asn                   |      Owner:  (none)
         Type:  defect                |     Status:  new
     Priority:  Medium                |  Milestone:  Tor: 0.3.3.x-final
    Component:  - Select a component  |    Version:  Tor: unspecified
     Severity:  Normal                |   Keywords:  tor-hs prop224
Actual Points:                        |  Parent ID:
       Points:  0.4                   |   Reviewer:
      Sponsor:                        |
--------------------------------------+--------------------------------
 Got the following non-fatal assert in my hsv3 IRC client some weeks ago.
 The tor version is pretty old, but I don't think we changed anything in
 the between to fix this issue.

 {{{
 Dec 13 16:58:04.000 [warn] tor_bug_occurred_(): Bug:
 src/or/hs_cache.c:628: cache_store_as_client: Non-fatal assertion
 !(cache_entry->desc->plaintext_data.revision_counter >
 client_desc->desc->plaintext_data.revision_counter) failed. (on Tor
 0.3.2.1-alpha-dev f71ff0cabc36b5ae)
 Dec 13 16:58:04.000 [warn] Bug: Non-fatal assertion
 !(cache_entry->desc->plaintext_data.revision_counter >
 client_desc->desc->plaintext_data.revision_counter) failed in
 cache_store_as_client at src/or/hs_cache.c:628. Stack trace: (on Tor
 0.3.2.1-alpha-dev f71ff0cabc36b5ae)
 Dec 13 16:58:04.000 [warn] Bug:     ./tor/src/or/tor(log_backtrace+0x42)
 [0x7fe385e0b442] (on Tor 0.3.2.1-alpha-dev f71ff0cabc36b5ae)
 Dec 13 16:58:04.000 [warn] Bug:
 ./tor/src/or/tor(tor_bug_occurred_+0xb7) [0x7fe385e262c7] (on Tor 0.3.2.1
 -alpha-dev f71ff0cabc36b5ae)
 Dec 13 16:58:04.000 [warn] Bug:
 ./tor/src/or/tor(hs_cache_store_as_client+0x1c2) [0x7fe385de4fc2] (on Tor
 0.3.2.1-alpha-dev f71ff0cabc36b5ae)
 Dec 13 16:58:04.000 [warn] Bug:
 ./tor/src/or/tor(connection_dir_reached_eof+0x1a67) [0x7fe385dbb757] (on
 Tor 0.3.2.1-alpha-dev f71ff0cabc36b5ae)
 Dec 13 16:58:04.000 [warn] Bug:     ./tor/src/or/tor(+0x1067cf)
 [0x7fe385d927cf] (on Tor 0.3.2.1-alpha-dev f71ff0cabc36b5ae)
 Dec 13 16:58:04.000 [warn] Bug:     ./tor/src/or/tor(+0x4dcf1)
 [0x7fe385cd9cf1] (on Tor 0.3.2.1-alpha-dev f71ff0cabc36b5ae)
 Dec 13 16:58:04.000 [warn] Bug:     /usr/lib/x86_64-linux-
 gnu/libevent-2.0.so.5(event_base_loop+0x7fc) [0x7fe38530f3dc] (on Tor
 0.3.2.1-alpha-dev f71ff0cabc36b5ae)
 Dec 13 16:58:04.000 [warn] Bug:     ./tor/src/or/tor(do_main_loop+0x244)
 [0x7fe385cdad84] (on Tor 0.3.2.1-alpha-dev f71ff0cabc36b5ae)
 Dec 13 16:58:04.000 [warn] Bug:     ./tor/src/or/tor(tor_main+0x1c25)
 [0x7fe385cde5c5] (on Tor 0.3.2.1-alpha-dev f71ff0cabc36b5ae)
 Dec 13 16:58:04.000 [warn] Bug:     ./tor/src/or/tor(main+0x19)
 [0x7fe385cd64d9] (on Tor 0.3.2.1-alpha-dev f71ff0cabc36b5ae)
 Dec 13 16:58:04.000 [warn] Bug:     /lib/x86_64-linux-
 gnu/libc.so.6(__libc_start_main+0xf1) [0x7fe3845022b1] (on Tor 0.3.2.1
 -alpha-dev f71ff0cabc36b5ae)
 Dec 13 16:58:04.000 [warn] Bug:     ./tor/src/or/tor(_start+0x2a)
 [0x7fe385cd652a] (on Tor 0.3.2.1-alpha-dev f71ff0cabc36b5ae)
 }}}

 Looking at the code, it seems to me that this BUG() could also be caused
 by some sort of HSDir-desynch, where some HSDirs have a newer desc than
 others? Perhaps we could look into this (altho it might be caused
 naturally with network issues), or just remove the BUG from that if
 statement, since it's handled pretty well?

 Not a serious bug all in all.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24976>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online

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