[tor-bugs] #12043 [Tor]: Stack Trace at SIGTERM when using Sanbox and obfsproxy

["Tor Bug Tracker & Wiki" <blackhole@xxxxxxxxxxxxxx>]

#12043: Stack Trace at SIGTERM when using Sanbox and obfsproxy
-----------------------+------------------------------------
 Reporter:  alphawolf  |          Owner:
     Type:  defect     |         Status:  new
 Priority:  normal     |      Milestone:  Tor: 0.2.5.x-final
Component:  Tor        |        Version:  Tor: 0.2.5.4-alpha
 Keywords:             |  Actual Points:
Parent ID:             |         Points:
-----------------------+------------------------------------
 Tor built from git (git-767b18ea8eebc2c0), with configure options to mimic
 Debian packaging.  When running as a bridge with obfsproxy and sandbox
 enabled, SIGTERM causes a stack trace.  Also, obfsproxy does not exit and
 must be killed manually.  Without sandbox, obfsproxy closes with tor.

 {{{
 May 19 01:48:11.000 [notice] Catching signal TERM, exiting cleanly.

 ============================================================ T= 1400478491
 (Sandbox) Caught a bad syscall attempt (syscall kill)
 /usr/bin/tor(+0x1806e1)[0x7f536e77c6e1]
 /lib/x86_64-linux-gnu/libc.so.6(kill+0x7)[0x7f536cc7a697]
 /lib/x86_64-linux-gnu/libc.so.6(kill+0x7)[0x7f536cc7a697]
 /usr/bin/tor(tor_terminate_process+0x2e)[0x7f536e776473]
 /usr/bin/tor(tor_process_handle_destroy+0x40)[0x7f536e776aae]
 /usr/bin/tor(+0x4bc56)[0x7f536e647c56]
 /usr/bin/tor(pt_free_all+0xb3)[0x7f536e64a437]
 /usr/bin/tor(tor_free_all+0x75)[0x7f536e632fa3]
 /usr/bin/tor(tor_cleanup+0x174)[0x7f536e633208]
 /usr/bin/tor(process_signal+0xc6)[0x7f536e631c43]
 /usr/bin/tor(+0x35b67)[0x7f536e631b67]
 /usr/lib/x86_64-linux-
 gnu/libevent-2.0.so.5(event_base_loop+0x9a5)[0x7f536dc88715]
 /usr/bin/tor(do_main_loop+0x36f)[0x7f536e631a06]
 /usr/bin/tor(tor_main+0x103)[0x7f536e634b11]
 /usr/bin/tor(main+0x2f)[0x7f536e62d664]
 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5)[0x7f536cc66b45]
 /usr/bin/tor(+0x31549)[0x7f536e62d549]
 }}}

 /usr/share/tor/tor-service-defaults-torrc:
 {{{
 DataDirectory /var/lib/tor
 PidFile /var/run/tor/tor.pid
 RunAsDaemon 1
 User debian-tor

 ControlSocket /var/run/tor/control
 ControlSocketsGroupWritable 1

 CookieAuthentication 1
 CookieAuthFileGroupReadable 1
 CookieAuthFile /var/run/tor/control.authcookie

 Log notice file /var/log/tor/log
 }}}

 torrc:
 {{{
 ORPort 9001
 #Nickname Test
 #DirPort 9030

 ExitPolicy reject *:* # no exits allowed

 BridgeRelay 1
 ServerTransportPlugin obfs3,scramblesuit exec /usr/bin/obfsproxy managed
 ExtORPort auto

 PublishServerDescriptor 0

 Sandbox 1
 }}}

 OS: Debian Jessie
 kernel: 3.13-1-amd64
 libseccomp-dev: 2.1.1-1
 obfsproxy: 0.2.8-1

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/12043>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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