Re: [tor-bugs] #21312 [Obfuscation/Snowflake]: snowflake-client is pegged at 100% cpu

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#21312: snowflake-client is pegged at 100% cpu
-----------------------------------+---------------------
 Reporter:  arlolra                |          Owner:
     Type:  defect                 |         Status:  new
 Priority:  Medium                 |      Milestone:
Component:  Obfuscation/Snowflake  |        Version:
 Severity:  Normal                 |     Resolution:
 Keywords:                         |  Actual Points:
Parent ID:                         |         Points:
 Reviewer:                         |        Sponsor:
-----------------------------------+---------------------

Comment (by arma):

 My snowflake-client has 1024 threads open, according to gdb's 'thread
 apply all bt'.

 About half of them are sitting in select:
 {{{
 Thread 559 (Thread 0x7f1178072700 (LWP 5595)):
 #0  0x00007f127a105893 in select () at ../sysdeps/unix/syscall-
 template.S:81
 #1  0x00000000007b1fd5 in ?? ()
 #2  0x0000000000681185 in ?? ()
 #3  0x00000000006938e4 in ?? ()
 #4  0x000000000069428c in ?? ()
 #5  0x00007f127ac7d064 in start_thread (arg=0x7f1178072700)
     at pthread_create.c:309
 #6  0x00007f127a10c62d in clone ()
     at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
 }}}
 and about half are in pthread_cond_timedwait:
 {{{
 Thread 561 (Thread 0x7f1178a75700 (LWP 5586)):
 #0  pthread_cond_timedwait@@GLIBC_2.3.2 ()
     at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
 #1  0x0000000000696b6a in ?? ()
 #2  0x000000000096c9b3 in ?? ()
 #3  0x000000000096cb29 in ?? ()
 #4  0x00000000006999e5 in ?? ()
 #5  0x0000000000699a19 in ?? ()
 #6  0x00007f127ac7d064 in start_thread (arg=0x7f1178a75700)
     at pthread_create.c:309
 #7  0x00007f127a10c62d in clone ()
     at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
 }}}
 but anyway I don't have many symbols so hey.

 What thing makes it keep making new threads? It's probably good that
 something in my system stopped it at 1024. :)

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21312#comment:2>
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