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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
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Reporter: arlolra | Owner: arlolra
Type: defect | Status: needs_revision
Priority: High | Milestone:
Component: Obfuscation/Snowflake | Version:
Severity: Major | Resolution:
Keywords: | Actual Points:
Parent ID: | Points:
Reviewer: | Sponsor:
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Comment (by dcf):
Replying to [comment:29 dcf]:
> Stand by. The server-webrtc process stopped running for some reason. I'm
not sure if it's related to the patch or not. I'll try running it again
with a debugger attached.
Here's a server-webrtc segfault from gdb.
{{{
Thread 6 "server-webrtc" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7f3d20f11700 (LWP 14901)]
0x0000000000000000 in ?? ()
(gdb) bt
#0 0x0000000000000000 in ?? ()
#1 0x000055cc34c659c8 in CGO_Channel_Send (channel=0x7f3cf401b2c0,
data=0xc42019a000, size=<optimized out>,
binary=<optimized out>) at /home/david/go/src/github.com/keroserene
/go-webrtc/datachannel.cc:19
#2 0x000055cc34aa7570 in runtime.asmcgocall () at
/usr/lib/go-1.7/src/runtime/asm_amd64.s:590
#3 0x000000c420022cd0 in ?? ()
#4 0x000055cc34a5114d in runtime.cgocall (fn=0x0, arg=0xc4200c81a0,
~r2=552668856)
at /usr/lib/go-1.7/src/runtime/cgocall.go:115
#5 0x000000c42001b500 in ?? ()
#6 0x0000000000000000 in ?? ()
}}}
It's happening in the call to `c.dc.Send(b)` inside `webRTCConn.Write`. (I
added a logging statement right after the `Send` that didn't get called.)
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21312#comment:31>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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