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Re: [tor-bugs] #21312 [Obfuscation/Snowflake]: snowflake-client is pegged at 100% cpu
#21312: snowflake-client is pegged at 100% cpu
-----------------------------------+------------------------------
Reporter: arlolra | Owner: arlolra
Type: defect | Status: needs_review
Priority: High | Milestone:
Component: Obfuscation/Snowflake | Version:
Severity: Major | Resolution:
Keywords: | Actual Points:
Parent ID: | Points:
Reviewer: | Sponsor:
-----------------------------------+------------------------------
Comment (by dcf):
Replying to [comment:39 dcf]:
> I'll try connecting a debugger to one of the frequently restarting
instances and see if there's anything obvious.
It didn't take long to get a crash in the debugger. It's not a segfault;
it's a runtime abort inside `CGO_DestroyPeer`. (Perhaps "Pure virtual
method called"? I'm not sure.)
{{{
(gdb) c
Continuing.
[New Thread 0x7f4d6cfc9700 (LWP 16471)]
[Thread 0x7f4d6d0ca700 (LWP 16457) exited]
Thread 3 "proxy-go" received signal SIGABRT, Aborted.
[Switching to Thread 0x7f4d76337700 (LWP 16396)]
__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
51 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1 0x00007f4d773b53fa in __GI_abort () at abort.c:89
#2 0x00007f4d77ccc0ad in __gnu_cxx::__verbose_terminate_handler() () from
/usr/lib/x86_64-linux-gnu/libstdc++.so.6
#3 0x00007f4d77cca066 in ?? () from /usr/lib/x86_64-linux-
gnu/libstdc++.so.6
#4 0x00007f4d77cca0b1 in std::terminate() () from /usr/lib/x86_64-linux-
gnu/libstdc++.so.6
#5 0x00007f4d77ccab8f in __cxa_pure_virtual () from /usr/lib/x86_64
-linux-gnu/libstdc++.so.6
#6 0x0000561ddf051957 in rtc::scoped_refptr<Peer>::scoped_refptr (r=...,
this=<optimized out>)
at ./include/webrtc/base/scoped_ref_ptr.h:82
#7
__gnu_cxx::__ops::_Iter_pred<CGO_DestroyPeer(CGO_Peer)::<lambda(rtc::scoped_refptr<Peer>)>
>::operator()<__gnu_cxx::__normal_iterator<rtc::scoped_refptr<Peer>*,
std::vector<rtc::scoped_refptr<Peer> > > > (__it=...,
this=<synthetic pointer>) at
/usr/include/c++/6/bits/predefined_ops.h:241
#8 std::__find_if<__gnu_cxx::__normal_iterator<rtc::scoped_refptr<Peer>*,
std::vector<rtc::scoped_refptr<Peer> > >,
__gnu_cxx::__ops::_Iter_pred<CGO_DestroyPeer(CGO_Peer)::<lambda(rtc::scoped_refptr<Peer>)>
> > (__pred=..., __last=
{ptr_ = 0xffffffff}, __first={ptr_ = 0x7f4d580008c0}) at
/usr/include/c++/6/bits/stl_algo.h:148
#9 std::__find_if<__gnu_cxx::__normal_iterator<rtc::scoped_refptr<Peer>*,
std::vector<rtc::scoped_refptr<Peer> > >,
__gnu_cxx::__ops::_Iter_pred<CGO_DestroyPeer(CGO_Peer)::<lambda(rtc::scoped_refptr<Peer>)>
> > (__pred=..., __last=...,
__first=...) at /usr/include/c++/6/bits/stl_algo.h:162
#10
std::__remove_if<__gnu_cxx::__normal_iterator<rtc::scoped_refptr<Peer>*,
std::vector<rtc::scoped_refptr<Peer> > >,
__gnu_cxx::__ops::_Iter_pred<CGO_DestroyPeer(CGO_Peer)::<lambda(rtc::scoped_refptr<Peer>)>
> > (__pred=..., __last=
{ptr_ = 0xffffffff}, __first=...) at
/usr/include/c++/6/bits/stl_algo.h:860
#11 std::remove_if<__gnu_cxx::__normal_iterator<rtc::scoped_refptr<Peer>*,
std::vector<rtc::scoped_refptr<Peer> > >,
CGO_DestroyPeer(CGO_Peer)::<lambda(rtc::scoped_refptr<Peer>)> >
(__pred=..., __last=..., __first=...)
at /usr/include/c++/6/bits/stl_algo.h:937
#12 CGO_DestroyPeer (cgoPeer=0x7f4d580008c0)
at /home/david/go/src/github.com/keroserene/go-
webrtc/peerconnection.cc:249
#13 0x0000561ddee9a350 in runtime.asmcgocall () at
/usr/lib/go-1.7/src/runtime/asm_amd64.s:590
#14 0x000000c420117de0 in ?? ()
#15 0x0000561ddee44dcd in runtime.cgocall (fn=0x0, arg=0xc420000ea0,
~r2=1983082168)
at /usr/lib/go-1.7/src/runtime/cgocall.go:115
#16 0x000000c420013500 in ?? ()
#17 0x0000000000000000 in ?? ()
}}}
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21312#comment:40>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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