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Re: deadlock with busy waiting on sigfe


On 2013-03-11 PM 11:36, Christopher Faylor wrote:
A "proper bug report" would at least include what you were actually doing
to trigger this problem.

I was trying to CTRL+C cygwin python process that is executing some operation and fell asleep for 60 seconds repeatedly. I'm pretty sure that the process was sleeping as i tried interrupt it.

Are you sure that there are only two threads executing here?  It seems like
this is a symptom of another thread holding the lock.

It's unlikely the case because there was two thread running when livelock observed.
cgf

Thread 2 (Thread 7596.0x104):
#0  0x7c96845c in ntdll!KiFastSystemCallRet ()
    from /cygdrive/c/WINDOWS/system32/ntdll.dll
#1  0x7c9678c9 in ntdll!ZwSetInformationThread ()
    from /cygdrive/c/WINDOWS/system32/ntdll.dll
#2  0x7c8324f9 in SetThreadPriority ()
    from /cygdrive/c/WINDOWS/system32/kernel32.dll
#3  0x6108790d in yield ()
     at
/netrel/src/cygwin-snapshot-20130309-1/winsup/cygwin/miscfuncs.cc:253
#4  0x610d7354 in _cygtls::lock() () from /usr/bin/cygwin1.dll
#5  0x6103096e in sigpacket::setup_handler (this=0x6aac34,
     handler=0x6102fe00 <signal_exit(int, siginfo_t*)>, siga=...,
tls=0x22ce64)
     at
/netrel/src/cygwin-snapshot-20130309-1/winsup/cygwin/exceptions.cc:796
#6  0x610318ff in sigpacket::process (this=0x6aac34)
     at
/netrel/src/cygwin-snapshot-20130309-1/winsup/cygwin/exceptions.cc:1245
---Type <return> to continue, or q <return> to quit---
#7  0x610dd74c in wait_sig ()
     at /netrel/src/cygwin-snapshot-20130309-1/winsup/cygwin/sigproc.cc:1389
#8  0x61003ea5 in cygthread::callfunc (this=0x6118b420 <threads>,
     issimplestub=<optimized out>)
     at /netrel/src/cygwin-snapshot-20130309-1/winsup/cygwin/cygthread.cc:51
#9  0x6100442f in cygthread::stub (arg=0x6118b420 <threads>)
     at /netrel/src/cygwin-snapshot-20130309-1/winsup/cygwin/cygthread.cc:93
#10 0x6100537d in _cygtls::call2 (this=<optimized out>,
     func=0x610043e0 <cygthread::stub(void*)>, arg=0x6118b420 <threads>,
     buf=0x6100551b <_cygtls::call(unsigned long (*)(void*, void*),
void*)+91>)
     at /netrel/src/cygwin-snapshot-20130309-1/winsup/cygwin/cygtls.cc:99
#11 0x006affb8 in ?? ()
#12 0x7c82484f in KERNEL32!GetModuleHandleA ()
    from /cygdrive/c/WINDOWS/system32/kernel32.dll
#13 0x00000000 in ?? ()

Thread 1 (Thread 7596.0x190):
#0  0x7c96845c in ntdll!KiFastSystemCallRet ()
    from /cygdrive/c/WINDOWS/system32/ntdll.dll
#1  0x7c9678c9 in ntdll!ZwSetInformationThread ()
    from /cygdrive/c/WINDOWS/system32/ntdll.dll
#2  0x7c8324f9 in SetThreadPriority ()
    from /cygdrive/c/WINDOWS/system32/kernel32.dll
#3  0x610878cb in yield ()
---Type <return> to continue, or q <return> to quit---
     at
/netrel/src/cygwin-snapshot-20130309-1/winsup/cygwin/miscfuncs.cc:244
#4  0x610d7354 in _cygtls::lock() () from /usr/bin/cygwin1.dll
#5  0x61031297 in _cygtls::call_signal_handler (
     this=0x610d7354 <_cygtls::lock()+23>)
     at
/netrel/src/cygwin-snapshot-20130309-1/winsup/cygwin/exceptions.cc:1265
#6  0x61007689 in _cygwin_exit_return ()
     at /netrel/src/cygwin-snapshot-20130309-1/winsup/cygwin/dcrt0.cc:1012
#7  0x6100537d in _cygtls::call2 (this=<optimized out>,
     func=0x61006c50 <dll_crt0_1(void*)>, arg=0x0,
     buf=0x6100551b <_cygtls::call(unsigned long (*)(void*, void*),
void*)+91>)
     at /netrel/src/cygwin-snapshot-20130309-1/winsup/cygwin/cygtls.cc:99
#8  0x0022ff78 in ?? ()
#9  0x004011d2 in ?? ()
#10 0x00401015 in ?? ()
#11 0x7c82f243 in ProcessIdToSessionId ()
    from /cygdrive/c/WINDOWS/system32/kernel32.dll

--
Regards.


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--
Regards.


-- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple


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