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Hi folks, I've had a buildbot worker running on cygwin for the last few years. The python program occasionally appears to busy-hang after forking a git, regardless of version of windows or up-to-dateness or 32/64 bitness of cygwin. More details at http://trac.buildbot.net/ticket/3670 Today it happened at the same time on both win7 and win10, so I'm starting to get motivated to understand it. Chances are it's just a bug in twisted 13.2 (which is pretty old), but I did see something interesting: strace of the livelocked python shows the following output repeatedly: -- Process 8232, exception c0000005 at 0000000180042C51 55 2120509 [flasio] python 9276 exception::handle: In cygwin_except_handler exception 0xC0000005 at 0x180042C51 sp 0x275CB60 32 2120541 [flasio] python 9276 exception::handle: In cygwin_except_handler signal 11 at 0x180042C51 72 2120613 [flasio] python 9276 _cygtls::inside_kernel: pc 0x180042C51, h 0x180040000, inside_kernel 0 40 2120653 [flasio] python 9276 seterrno_from_nt_status: /home/corinna/src/cygwin/cygwin-2.6.0/cygwin-2.6.0-1.x86_64/src/newlib-cygwin/winsup/cygwin/fhandler_mailslot.cc:132 status 0xC0000034 -> windows error 2 30 2120683 [flasio] python 9276 geterrno_from_win_error: windows error 2 == errno 2 30 2120713 [flasio] python 9276 sig_send: sendsig 0xC4, pid 9276, signal 11, its_me 1 28 2120741 [flasio] python 9276 sig_send: wakeup 0x42C 32 2120773 [sig] python 9276 sigpacket::process: signal 11 processing 19 2120792 [sig] python 9276 sigpacket::process: signal 11 blocked 18 2120810 [sig] python 9276 sigpacket::process: returning -1 22 2120832 [sig] python 9276 wait_sig: signalling pack.wakeup 0x42C 24 2120856 [flasio] python 9276 sig_send: Waiting for pack.wakeup 0x42C 30 2120886 [flasio] python 9276 sig_send: returning 0x0 from sending signal 11 Attaching with gdb and doing 'info threads' and 'bt N' on each thread until I found a related-looking thread showed: #0 0x00007ffbd845386a in ntdll!ZwWaitForSingleObject () from /cygdrive/c/Windows/SYSTEM32/ntdll.dll #1 0x00007ffbd51e415f in WaitForSingleObjectEx () from /cygdrive/c/Windows/system32/KERNELBASE.dll #2 0x000000018011f027 in sig_send(_pinfo*, siginfo_t&, _cygtls*) () from /usr/bin/cygwin1.dll #3 0x000000018005c7c1 in exception::handle(_EXCEPTION_RECORD*, void*, _CONTEXT*, _DISPATCHER_CONTEXT*) () from /usr/bin/cygwin1.dll #4 0x00007ffbd845666d in ntdll!.chkstk () from /cygdrive/c/Windows/SYSTEM32/ntdll.dll #5 0x00007ffbd83d3c00 in ntdll!RtlWalkFrameChain () from /cygdrive/c/Windows/SYSTEM32/ntdll.dll #6 0x00007ffbd845577a in ntdll!KiUserExceptionDispatcher () from /cygdrive/c/Windows/SYSTEM32/ntdll.dll #7 0x0000000180042c51 in _cfree () from /usr/bin/cygwin1.dll #8 0x00000001801deab3 in fhandler_pipe::~fhandler_pipe() () from /usr/bin/cygwin1.dll #9 0x00000001800621f5 in flush_async_io(void*) () from /usr/bin/cygwin1.dll #10 0x0000000180044753 in cygthread::callfunc(bool) () from /usr/bin/cygwin1.dll #11 0x0000000180044cea in cygthread::stub(void*) () from /usr/bin/cygwin1.dll #12 0x0000000180045733 in _cygtls::call2(unsigned int (*)(void*, void*), void*, void*) () from /usr/bin/cygwin1.dll #13 0x00000001800457e4 in _cygtls::call(unsigned int (*)(void*, void*), void*) () from /usr/bin/cygwin1.dll #14 0x00007ffbd5e52d92 in KERNEL32!BaseThreadInitThunk () from /cygdrive/c/Windows/system32/KERNEL32.DLL #15 0x00007ffbd83c9f64 in ntdll!RtlUserThreadStart () from /cygdrive/c/Windows/SYSTEM32/ntdll.dll An exception in chkstk in a thread that looks like it's cygwin's baby seemed interesting enough to report. I'll attach the output of cygcheck and gdb.
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