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Re: [tor-bugs] #27750 [Core Tor/Tor]: conn_close_if_marked: Non-fatal assertion !(connection_is_writing(conn))

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Subject: Re: [tor-bugs] #27750 [Core Tor/Tor]: conn_close_if_marked: Non-fatal assertion !(connection_is_writing(conn))
From: "Tor Bug Tracker & Wiki" <blackhole@xxxxxxxxxxxxxx>
Date: Tue, 23 Oct 2018 17:06:12 -0000
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#27750: conn_close_if_marked: Non-fatal assertion !(connection_is_writing(conn))
------------------------------------------+--------------------------------
 Reporter:  dgoulet                       |          Owner:  dgoulet
     Type:  defect                        |         Status:  new
 Priority:  Very High                     |      Milestone:  Tor:
                                          |  0.3.5.x-final
Component:  Core Tor/Tor                  |        Version:  Tor: 0.3.4.8
 Severity:  Normal                        |     Resolution:
 Keywords:  regression, assert, 035-must  |  Actual Points:
Parent ID:                                |         Points:
 Reviewer:                                |        Sponsor:
------------------------------------------+--------------------------------
Changes (by arma):

 * status:  needs_information => new


Comment:

 A very similar line happened on moria1 as well (running recent master):
 {{{
 Oct 23 12:00:16.220 [warn] tor_bug_occurred_(): Bug:
 src/core/mainloop/mainloop.c:1022: conn_close_if_marked: Non-fatal
 assertion !(connection_is_reading(conn)) failed. (on Tor 0.3.6.0-alpha-dev
 275e831ceac6382a)
 Oct 23 12:00:16.220 [warn] Bug: Non-fatal assertion
 !(connection_is_reading(conn)) failed in conn_close_if_marked at
 src/core/mainloop/mainloop.c:1022. Stack trace: (on Tor 0.3.6.0-alpha-dev
 275e831ceac6382a)
 Oct 23 12:00:16.220 [warn] Bug:
 ../git/src/app/tor(log_backtrace_impl+0x47) [0x55beac520f37] (on Tor
 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:16.220 [warn] Bug:
 ../git/src/app/tor(tor_bug_occurred_+0xd1) [0x55beac51c4c1] (on Tor
 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:16.220 [warn] Bug:     ../git/src/app/tor(+0x6a645)
 [0x55beac392645] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:16.220 [warn] Bug:     ../git/src/app/tor(+0x6a72e)
 [0x55beac39272e] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:16.220 [warn] Bug:     ../git/src/app/tor(+0x216622)
 [0x55beac53e622] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:16.220 [warn] Bug:     ../git/src/app/tor(+0x216b25)
 [0x55beac53eb25] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:16.220 [warn] Bug:
 ../git/src/app/tor(event_base_loop+0x2c8) [0x55beac53f289] (on Tor 0.3.6.0
 -alpha-dev 275e831ceac6382a)
 Oct 23 12:00:16.220 [warn] Bug:     ../git/src/app/tor(do_main_loop+0x84)
 [0x55beac3909f4] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:16.220 [warn] Bug:     ../git/src/app/tor(tor_run_main+0x4d6)
 [0x55beac3816c6] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:16.220 [warn] Bug:     ../git/src/app/tor(tor_main+0x43)
 [0x55beac37e4c3] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:16.220 [warn] Bug:     ../git/src/app/tor(main+0x19)
 [0x55beac37e149] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:16.220 [warn] Bug:
 /lib64/libc.so.6(__libc_start_main+0xfd) [0x7f1712c16d1d] (on Tor 0.3.6.0
 -alpha-dev 275e831ceac6382a)
 Oct 23 12:00:16.220 [warn] Bug:     ../git/src/app/tor(+0x56059)
 [0x55beac37e059] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:19.220 [warn] tor_bug_occurred_(): Bug:
 src/core/mainloop/mainloop.c:1022: conn_close_if_marked: Non-fatal
 assertion !(connection_is_reading(conn)) failed. (on Tor 0.3.6.0-alpha-dev
 275e831ceac6382a)
 Oct 23 12:00:19.221 [warn] Bug: Non-fatal assertion
 !(connection_is_reading(conn)) failed in conn_close_if_marked at
 src/core/mainloop/mainloop.c:1022. Stack trace: (on Tor 0.3.6.0-alpha-dev
 275e831ceac6382a)
 Oct 23 12:00:19.221 [warn] Bug:
 ../git/src/app/tor(log_backtrace_impl+0x47) [0x55beac520f37] (on Tor
 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:19.221 [warn] Bug:
 ../git/src/app/tor(tor_bug_occurred_+0xd1) [0x55beac51c4c1] (on Tor
 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:19.221 [warn] Bug:     ../git/src/app/tor(+0x6a645)
 [0x55beac392645] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:19.221 [warn] Bug:     ../git/src/app/tor(+0x6a72e)
 [0x55beac39272e] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:19.221 [warn] Bug:     ../git/src/app/tor(+0x216622)
 [0x55beac53e622] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:19.221 [warn] Bug:     ../git/src/app/tor(+0x216b25)
 [0x55beac53eb25] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:19.221 [warn] Bug:
 ../git/src/app/tor(event_base_loop+0x2c8) [0x55beac53f289] (on Tor 0.3.6.0
 -alpha-dev 275e831ceac6382a)
 Oct 23 12:00:19.221 [warn] Bug:     ../git/src/app/tor(do_main_loop+0x84)
 [0x55beac3909f4] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:19.221 [warn] Bug:     ../git/src/app/tor(tor_run_main+0x4d6)
 [0x55beac3816c6] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:19.221 [warn] Bug:     ../git/src/app/tor(tor_main+0x43)
 [0x55beac37e4c3] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:19.221 [warn] Bug:     ../git/src/app/tor(main+0x19)
 [0x55beac37e149] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:19.221 [warn] Bug:
 /lib64/libc.so.6(__libc_start_main+0xfd) [0x7f1712c16d1d] (on Tor 0.3.6.0
 -alpha-dev 275e831ceac6382a)
 Oct 23 12:00:19.221 [warn] Bug:     ../git/src/app/tor(+0x56059)
 [0x55beac37e059] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.214 [warn] tor_bug_occurred_(): Bug:
 src/core/mainloop/mainloop.c:1022: conn_close_if_marked: Non-fatal
 assertion !(connection_is_reading(conn)) failed. (on Tor 0.3.6.0-alpha-dev
 275e831ceac6382a)
 Oct 23 12:00:23.214 [warn] Bug: Non-fatal assertion
 !(connection_is_reading(conn)) failed in conn_close_if_marked at
 src/core/mainloop/mainloop.c:1022. Stack trace: (on Tor 0.3.6.0-alpha-dev
 275e831ceac6382a)
 Oct 23 12:00:23.214 [warn] Bug:
 ../git/src/app/tor(log_backtrace_impl+0x47) [0x55beac520f37] (on Tor
 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.214 [warn] Bug:
 ../git/src/app/tor(tor_bug_occurred_+0xd1) [0x55beac51c4c1] (on Tor
 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.214 [warn] Bug:     ../git/src/app/tor(+0x6a645)
 [0x55beac392645] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.214 [warn] Bug:     ../git/src/app/tor(+0x6a72e)
 [0x55beac39272e] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.214 [warn] Bug:     ../git/src/app/tor(+0x216622)
 [0x55beac53e622] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.215 [warn] Bug:     ../git/src/app/tor(+0x216b25)
 [0x55beac53eb25] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.215 [warn] Bug:
 ../git/src/app/tor(event_base_loop+0x2c8) [0x55beac53f289] (on Tor 0.3.6.0
 -alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.215 [warn] Bug:     ../git/src/app/tor(do_main_loop+0x84)
 [0x55beac3909f4] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.215 [warn] Bug:     ../git/src/app/tor(tor_run_main+0x4d6)
 [0x55beac3816c6] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.215 [warn] Bug:     ../git/src/app/tor(tor_main+0x43)
 [0x55beac37e4c3] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.215 [warn] Bug:     ../git/src/app/tor(main+0x19)
 [0x55beac37e149] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.215 [warn] Bug:
 /lib64/libc.so.6(__libc_start_main+0xfd) [0x7f1712c16d1d] (on Tor 0.3.6.0
 -alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.215 [warn] Bug:     ../git/src/app/tor(+0x56059)
 [0x55beac37e059] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.215 [warn] tor_bug_occurred_(): Bug:
 src/core/mainloop/mainloop.c:1022: conn_close_if_marked: Non-fatal
 assertion !(connection_is_reading(conn)) failed. (on Tor 0.3.6.0-alpha-dev
 275e831ceac6382a)
 Oct 23 12:00:23.215 [warn] Bug: Non-fatal assertion
 !(connection_is_reading(conn)) failed in conn_close_if_marked at
 src/core/mainloop/mainloop.c:1022. Stack trace: (on Tor 0.3.6.0-alpha-dev
 275e831ceac6382a)
 Oct 23 12:00:23.215 [warn] Bug:
 ../git/src/app/tor(log_backtrace_impl+0x47) [0x55beac520f37] (on Tor
 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.215 [warn] Bug:
 ../git/src/app/tor(tor_bug_occurred_+0xd1) [0x55beac51c4c1] (on Tor
 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.215 [warn] Bug:     ../git/src/app/tor(+0x6a645)
 [0x55beac392645] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.215 [warn] Bug:     ../git/src/app/tor(+0x6a72e)
 [0x55beac39272e] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.215 [warn] Bug:     ../git/src/app/tor(+0x216622)
 [0x55beac53e622] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.215 [warn] Bug:     ../git/src/app/tor(+0x216b25)
 [0x55beac53eb25] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.215 [warn] Bug:
 ../git/src/app/tor(event_base_loop+0x2c8) [0x55beac53f289] (on Tor 0.3.6.0
 -alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.215 [warn] Bug:     ../git/src/app/tor(do_main_loop+0x84)
 [0x55beac3909f4] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.215 [warn] Bug:     ../git/src/app/tor(tor_run_main+0x4d6)
 [0x55beac3816c6] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.215 [warn] Bug:     ../git/src/app/tor(tor_main+0x43)
 [0x55beac37e4c3] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.215 [warn] Bug:     ../git/src/app/tor(main+0x19)
 [0x55beac37e149] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.215 [warn] Bug:
 /lib64/libc.so.6(__libc_start_main+0xfd) [0x7f1712c16d1d] (on Tor 0.3.6.0
 -alpha-dev 275e831ceac6382a)
 Oct 23 12:00:23.215 [warn] Bug:     ../git/src/app/tor(+0x56059)
 [0x55beac37e059] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.221 [warn] tor_bug_occurred_(): Bug:
 src/core/mainloop/mainloop.c:1022: conn_close_if_marked: Non-fatal
 assertion !(connection_is_reading(conn)) failed. (on Tor 0.3.6.0-alpha-dev
 275e831ceac6382a)
 Oct 23 12:00:27.221 [warn] Bug: Non-fatal assertion
 !(connection_is_reading(conn)) failed in conn_close_if_marked at
 src/core/mainloop/mainloop.c:1022. Stack trace: (on Tor 0.3.6.0-alpha-dev
 275e831ceac6382a)
 Oct 23 12:00:27.221 [warn] Bug:
 ../git/src/app/tor(log_backtrace_impl+0x47) [0x55beac520f37] (on Tor
 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.221 [warn] Bug:
 ../git/src/app/tor(tor_bug_occurred_+0xd1) [0x55beac51c4c1] (on Tor
 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.221 [warn] Bug:     ../git/src/app/tor(+0x6a645)
 [0x55beac392645] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.221 [warn] Bug:     ../git/src/app/tor(+0x6a72e)
 [0x55beac39272e] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.221 [warn] Bug:     ../git/src/app/tor(+0x216622)
 [0x55beac53e622] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.221 [warn] Bug:     ../git/src/app/tor(+0x216b25)
 [0x55beac53eb25] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.221 [warn] Bug:
 ../git/src/app/tor(event_base_loop+0x2c8) [0x55beac53f289] (on Tor 0.3.6.0
 -alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.221 [warn] Bug:     ../git/src/app/tor(do_main_loop+0x84)
 [0x55beac3909f4] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.221 [warn] Bug:     ../git/src/app/tor(tor_run_main+0x4d6)
 [0x55beac3816c6] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.221 [warn] Bug:     ../git/src/app/tor(tor_main+0x43)
 [0x55beac37e4c3] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.222 [warn] Bug:     ../git/src/app/tor(main+0x19)
 [0x55beac37e149] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.222 [warn] Bug:
 /lib64/libc.so.6(__libc_start_main+0xfd) [0x7f1712c16d1d] (on Tor 0.3.6.0
 -alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.222 [warn] Bug:     ../git/src/app/tor(+0x56059)
 [0x55beac37e059] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.222 [warn] tor_bug_occurred_(): Bug:
 src/core/mainloop/mainloop.c:1022: conn_close_if_marked: Non-fatal
 assertion !(connection_is_reading(conn)) failed. (on Tor 0.3.6.0-alpha-dev
 275e831ceac6382a)
 Oct 23 12:00:27.222 [warn] Bug: Non-fatal assertion
 !(connection_is_reading(conn)) failed in conn_close_if_marked at
 src/core/mainloop/mainloop.c:1022. Stack trace: (on Tor 0.3.6.0-alpha-dev
 275e831ceac6382a)
 Oct 23 12:00:27.222 [warn] Bug:
 ../git/src/app/tor(log_backtrace_impl+0x47) [0x55beac520f37] (on Tor
 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.222 [warn] Bug:
 ../git/src/app/tor(tor_bug_occurred_+0xd1) [0x55beac51c4c1] (on Tor
 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.222 [warn] Bug:     ../git/src/app/tor(+0x6a645)
 [0x55beac392645] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.222 [warn] Bug:     ../git/src/app/tor(+0x6a72e)
 [0x55beac39272e] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.222 [warn] Bug:     ../git/src/app/tor(+0x216622)
 [0x55beac53e622] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.222 [warn] Bug:     ../git/src/app/tor(+0x216b25)
 [0x55beac53eb25] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.222 [warn] Bug:
 ../git/src/app/tor(event_base_loop+0x2c8) [0x55beac53f289] (on Tor 0.3.6.0
 -alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.222 [warn] Bug:     ../git/src/app/tor(do_main_loop+0x84)
 [0x55beac3909f4] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.222 [warn] Bug:     ../git/src/app/tor(tor_run_main+0x4d6)
 [0x55beac3816c6] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.222 [warn] Bug:     ../git/src/app/tor(tor_main+0x43)
 [0x55beac37e4c3] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.222 [warn] Bug:     ../git/src/app/tor(main+0x19)
 [0x55beac37e149] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.222 [warn] Bug:
 /lib64/libc.so.6(__libc_start_main+0xfd) [0x7f1712c16d1d] (on Tor 0.3.6.0
 -alpha-dev 275e831ceac6382a)
 Oct 23 12:00:27.222 [warn] Bug:     ../git/src/app/tor(+0x56059)
 [0x55beac37e059] (on Tor 0.3.6.0-alpha-dev 275e831ceac6382a)
 }}}

 (isn't it supposed to stop the detailed stack traces after the first one?)

 In fact, I seem to be getting a flood of these stack traces at the top of
 each hour (right after I make available my new consensus).

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27750#comment:25>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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