[tor-bugs] #21312 [Obfuscation/Snowflake]: snowflake-client is pegged at 100% cpu
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Thu Aug 17 00:39:38 UTC 2017
#21312: snowflake-client is pegged at 100% cpu
-----------------------------------+------------------------
Reporter: arlolra | Owner: (none)
Type: defect | Status: new
Priority: Medium | Milestone:
Component: Obfuscation/Snowflake | Version:
Severity: Normal | Resolution:
Keywords: | Actual Points:
Parent ID: | Points:
Reviewer: | Sponsor:
-----------------------------------+------------------------
Comment (by dcf):
Thanks yawning.
Here are backtraces from another case from today, this time with debugging
symbols. In this case there were 89 threads and 168 fds.
attachment:20170816-thread-apply-all-bt.txt
Most of the backtraces are in one of two patterns.
* 27 threads
{{{
#0 pthread_cond_timedwait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#1 0x000000000063c9de in rtc::Event::Wait(int) ()
#2 0x000000000088833a in webrtc::EventWrapperImpl::Wait(unsigned long) ()
#3 0x000000000087ac0d in webrtc::ProcessThreadImpl::Process() ()
#4 0x000000000063e837 in rtc::PlatformThread::Run() ()
#5 0x000000000063e786 in rtc::PlatformThread::StartThread(void*) ()
#6 0x00007fcf4b70a494 in start_thread (arg=0x7fcebc5f6700) at
pthread_create.c:333
#7 0x00007fcf4aba2a8f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:97
}}}
* 50 threads
{{{
#0 0x00007fcf4ab9b383 in select () at ../sysdeps/unix/syscall-
template.S:84
#1 0x0000000000688e48 in rtc::PhysicalSocketServer::Wait(int, bool) ()
#2 0x000000000063b3b1 in rtc::MessageQueue::Get(rtc::Message*, int, bool)
()
#3 0x0000000000639a72 in rtc::Thread::Run() ()
#4 0x0000000000639783 in rtc::Thread::PreRun(void*) ()
#5 0x00007fcf4b70a494 in start_thread (arg=0x7fcead7ea700) at
pthread_create.c:333
#6 0x00007fcf4aba2a8f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:97
}}}
{{{
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21312#comment:13>
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