[tor-bugs] #18614 [Core Tor/Tor]: tor uses full cpu when unplugged

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#18614: tor uses full cpu when unplugged
--------------------------+-----------------------------------
 Reporter:  zqcxobbe      |          Owner:
     Type:  defect        |         Status:  needs_information
 Priority:  Medium        |      Milestone:
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:  tor cpu hang  |  Actual Points:
Parent ID:                |         Points:
 Reviewer:                |        Sponsor:
--------------------------+-----------------------------------

Comment (by zqcxobbe):

 Replying to [comment:10 zqcxobbe]:
 > Replying to [comment:9 cypherpunks]:
 > > "Could not attach to process." and/or "ptrace: Operation not
 permitted." too?
 > I don't remember any of that, but I'll check when it happens again.

 I hope that this helps

 {{{
 $ sudo gdb -p 2369

 GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1
 Copyright (C) 2014 Free Software Foundation, Inc.
 License GPLv3+: GNU GPL version 3 or later
 <http://gnu.org/licenses/gpl.html>
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 This GDB was configured as "x86_64-linux-gnu".
 Type "show configuration" for configuration details.
 For bug reporting instructions, please see:
 <http://www.gnu.org/software/gdb/bugs/>.
 Find the GDB manual and other documentation resources online at:
 <http://www.gnu.org/software/gdb/documentation/>.
 For help, type "help".
 Type "apropos word" to search for commands related to "word".
 Attaching to process 2369
 Reading symbols from /usr/bin/tor...(no debugging symbols found)...done.
 Reading symbols from /lib/x86_64-linux-gnu/libz.so.1...(no debugging
 symbols found)...done.
 Loaded symbols for /lib/x86_64-linux-gnu/libz.so.1
 Reading symbols from /lib/x86_64-linux-gnu/libm.so.6...Reading symbols
 from /usr/lib/debug//lib/x86_64-linux-gnu/libm-2.19.so...done.
 done.
 Loaded symbols for /lib/x86_64-linux-gnu/libm.so.6
 Reading symbols from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5...(no
 debugging symbols found)...done.
 Loaded symbols for /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
 Reading symbols from /lib/x86_64-linux-gnu/libssl.so.1.0.0...(no debugging
 symbols found)...done.
 Loaded symbols for /lib/x86_64-linux-gnu/libssl.so.1.0.0
 Reading symbols from /lib/x86_64-linux-gnu/libcrypto.so.1.0.0...(no
 debugging symbols found)...done.
 Loaded symbols for /lib/x86_64-linux-gnu/libcrypto.so.1.0.0
 Reading symbols from /usr/lib/x86_64-linux-gnu/libseccomp.so.2...(no
 debugging symbols found)...done.
 Loaded symbols for /usr/lib/x86_64-linux-gnu/libseccomp.so.2
 Reading symbols from /lib/x86_64-linux-gnu/libpthread.so.0...Reading
 symbols from /usr/lib/debug//lib/x86_64-linux-
 gnu/libpthread-2.19.so...done.
 done.
 [Thread debugging using libthread_db enabled]
 Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
 Loaded symbols for /lib/x86_64-linux-gnu/libpthread.so.0
 Reading symbols from /lib/x86_64-linux-gnu/libc.so.6...Reading symbols
 from /usr/lib/debug//lib/x86_64-linux-gnu/libc-2.19.so...done.
 done.
 Loaded symbols for /lib/x86_64-linux-gnu/libc.so.6
 Reading symbols from /lib/x86_64-linux-gnu/libdl.so.2...Reading symbols
 from /usr/lib/debug//lib/x86_64-linux-gnu/libdl-2.19.so...done.
 done.
 Loaded symbols for /lib/x86_64-linux-gnu/libdl.so.2
 Reading symbols from /lib64/ld-linux-x86-64.so.2...Reading symbols from
 /usr/lib/debug//lib/x86_64-linux-gnu/ld-2.19.so...done.
 done.
 Loaded symbols for /lib64/ld-linux-x86-64.so.2
 Reading symbols from /lib/x86_64-linux-gnu/libgcc_s.so.1...(no debugging
 symbols found)...done.
 Loaded symbols for /lib/x86_64-linux-gnu/libgcc_s.so.1
 Reading symbols from /lib/x86_64-linux-gnu/libnss_compat.so.2...Reading
 symbols from /usr/lib/debug//lib/x86_64-linux-
 gnu/libnss_compat-2.19.so...done.
 done.
 Loaded symbols for /lib/x86_64-linux-gnu/libnss_compat.so.2
 Reading symbols from /lib/x86_64-linux-gnu/libnsl.so.1...Reading symbols
 from /usr/lib/debug//lib/x86_64-linux-gnu/libnsl-2.19.so...done.
 done.
 Loaded symbols for /lib/x86_64-linux-gnu/libnsl.so.1
 Reading symbols from /lib/x86_64-linux-gnu/libnss_nis.so.2...Reading
 symbols from /usr/lib/debug//lib/x86_64-linux-
 gnu/libnss_nis-2.19.so...done.
 done.
 Loaded symbols for /lib/x86_64-linux-gnu/libnss_nis.so.2
 Reading symbols from /lib/x86_64-linux-gnu/libnss_files.so.2...Reading
 symbols from /usr/lib/debug//lib/x86_64-linux-
 gnu/libnss_files-2.19.so...done.
 done.
 Loaded symbols for /lib/x86_64-linux-gnu/libnss_files.so.2
 0x000056505b2d65b0 in circuit_get_global_list ()
 (gdb) bt
 #0  0x000056505b2d65b0 in circuit_get_global_list ()
 #1  0x000056505b2e27fa in circuit_stream_is_being_handled ()
 #2  0x000056505b2d0878 in ?? ()
 #3  0x000056505b2d429c in circuit_establish_circuit ()
 #4  0x000056505b2e5051 in circuit_launch_by_extend_info ()
 #5  0x000056505b2e5b75 in ?? ()
 #6  0x000056505b2e6422 in connection_ap_handshake_attach_circuit ()
 #7  0x000056505b306cf8 in connection_ap_handshake_rewrite_and_attach ()
 #8  0x000056505b336d3f in ?? ()
 #9  0x00007feed8b0efd3 in ?? ()
    from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
 #10 0x00007feed8b0f0a9 in ?? ()
    from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
 #11 0x00007feed8af2f24 in event_base_loop ()
    from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
 #12 0x000056505b25e49d in do_main_loop ()
 #13 0x000056505b2625ad in tor_main ()
 #14 0x000056505b25b7e9 in main ()
 }}}

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18614#comment:11>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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