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Re: [tor-bugs] #30494 [Circumvention/Snowflake]: Crazy snowflake-client segfault

#30494: Crazy snowflake-client segfault
-------------------------------------+------------------------
 Reporter:  cypherpunks              |          Owner:  (none)
     Type:  defect                   |         Status:  new
 Priority:  Medium                   |      Milestone:
Component:  Circumvention/Snowflake  |        Version:
 Severity:  Normal                   |     Resolution:
 Keywords:                           |  Actual Points:
Parent ID:                           |         Points:
 Reviewer:                           |        Sponsor:
-------------------------------------+------------------------
Changes (by dcf):

 * cc: dcf (added)


Old description:

> you can find the log here:
>
> https://privatebin.net/?c3d4395e1b03977d#FUC9n8xA05QWHZjPA5CHSMyMl3918hq15MIgc5eKgCk=

New description:

 you can find the log here:

 attachment:tor.log

 https://privatebin.net/?c3d4395e1b03977d#FUC9n8xA05QWHZjPA5CHSMyMl3918hq15MIgc5eKgCk=

--

Comment:

 Here's one of the panics extracted from the log.

 {{{
 fatal error: unexpected signal during runtime execution
 [signal SIGSEGV: segmentation violation code=0x1 addr=0xffffffffffffff83
 pc=0x8bbd53]

 runtime stack:
 runtime.throw(0xdf0c50, 0x2a)
         /var/tmp/dist/go/src/runtime/panic.go:608 +0x72
 runtime.sigpanic()
         /var/tmp/dist/go/src/runtime/signal_unix.go:374 +0x2f2

 goroutine 21 [syscall]:
 runtime.cgocall(0x66f3b0, 0xc00004bc40, 0xc00007ccf0)
         /var/tmp/dist/go/src/runtime/cgocall.go:128 +0x5e fp=0xc00004bc08
 sp=0xc00004bbd0 pc=0x4440be
 github.com/keroserene/go-webrtc._Cfunc_CGO_InitializePeer(0x1, 0x0)
         _cgo_gotypes.go:581 +0x4e fp=0xc00004bc40 sp=0xc00004bc08
 pc=0x658bbe
 github.com/keroserene/go-webrtc.NewPeerConnection(0xc000094340, 0x0, 0x0,
 0x0)
         /var/tmp/dist/gopath/src/github.com/keroserene/go-
 webrtc/peerconnection.go:157 +0x97 fp=0xc00004bcb0 sp=0xc00004bc40
 pc=0x65b487
 main.(*WebRTCPeer).preparePeerConnection(0xc000126000, 0x2, 0x2)
         /var/tmp/build/snowflake-6077141f4aff/client/webrtc.go:157 +0x49
 fp=0xc00004bd28 sp=0xc00004bcb0 pc=0x66bdf9
 main.(*WebRTCPeer).Connect(0xc000126000, 0xc00007cdb0, 0xc000126000)
         /var/tmp/build/snowflake-6077141f4aff/client/webrtc.go:135 +0xa4
 fp=0xc00004bd78 sp=0xc00004bd28 pc=0x66bca4
 main.WebRTCDialer.Catch(0xc00007cdb0, 0xc000094340, 0xc000016200, 0x37,
 0x0, 0x0)
         /var/tmp/build/snowflake-6077141f4aff/client/rendezvous.go:143
 +0xb2 fp=0xc00004bda8 sp=0xc00004bd78 pc=0x668b22
 main.(*WebRTCDialer).Catch(0xc00007acf0, 0x2, 0x2, 0xc000024020, 0x2)
         :1 +0x45 fp=0xc00004bde8 sp=0xc00004bda8 pc=0x66dee5
 main.(*Peers).Collect(0xc000094300, 0x0, 0x0, 0x0, 0x0)
         /var/tmp/build/snowflake-6077141f4aff/client/peers.go:56 +0x306
 fp=0xc00004bed8 sp=0xc00004bde8 pc=0x6678d6
 main.ConnectLoop(0xe2db80, 0xc000094300)
         /var/tmp/build/snowflake-6077141f4aff/client/snowflake.go:38 +0x49
 fp=0xc00004bfd0 sp=0xc00004bed8 pc=0x6692d9
 runtime.goexit()
         /var/tmp/dist/go/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc00004bfd8
 sp=0xc00004bfd0 pc=0x498101
 created by main.main
         /var/tmp/build/snowflake-6077141f4aff/client/snowflake.go:186
 +0x66a

 goroutine 1 [runnable]:
 os/signal.signal_enable(0xd3d6a9540000000f)
         /var/tmp/dist/go/src/runtime/sigqueue.go:207 +0x6f
 os/signal.enableSignal(0xf)
         /var/tmp/dist/go/src/os/signal/signal_unix.go:50 +0x2a
 os/signal.Notify.func1(0xf)
         /var/tmp/dist/go/src/os/signal/signal.go:135 +0x8d
 os/signal.Notify(0xc000092300, 0xc0000d5eb8, 0x1, 0x1)
         /var/tmp/dist/go/src/os/signal/signal.go:147 +0x148
 main.main()
         /var/tmp/build/snowflake-6077141f4aff/client/snowflake.go:219
 +0x888

 goroutine 19 [syscall]:
 os/signal.signal_recv(0x0)
         /var/tmp/dist/go/src/runtime/sigqueue.go:139 +0x9c
 os/signal.loop()
         /var/tmp/dist/go/src/os/signal/signal_unix.go:23 +0x22
 created by os/signal.init.0
         /var/tmp/dist/go/src/os/signal/signal_unix.go:29 +0x41

 goroutine 20 [select]:
 main.(*BytesSyncLogger).Log(0xc000094480)
         /var/tmp/build/snowflake-6077141f4aff/client/util.go:59 +0x182
 created by main.main
         /var/tmp/build/snowflake-6077141f4aff/client/snowflake.go:184
 +0x639

 goroutine 22 [runnable]:
 main.socksAcceptLoop(0xc00007ad40, 0xe2db80, 0xc000094300, 0x0, 0x0)
         /var/tmp/build/snowflake-6077141f4aff/client/snowflake.go:54
 created by main.main
         /var/tmp/build/snowflake-6077141f4aff/client/snowflake.go:207
 +0xbe8
 }}}

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30494#comment:1>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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