Mail Archives: cygwin/2014/10/20/09:04:20
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| Date: | Mon, 20 Oct 2014 09:03:49 -0400
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| From: | Ken Brown <kbrown AT cornell DOT edu>
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| To: | cygwin <cygwin AT cygwin DOT com>
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When trying to debug emacs in gdb, I see several threads, but it's not always
clear who created those threads and what they're doing. As an example, I
attached gdb to an emacs-X11 process (running under X) shortly after starting
it, and I obtained the backtrace appended at the end of this message.
I assume Thread 12 was created by gdb. Thread 6 appears to be a timer thread
and Thread 2 appears to be a signal thread; I assume both of these were created
by the Cygwin DLL. And Thread 1 is the main thread. I don't have any idea
where the other threads came from. Presumably at least one of them was created
by Glib.
The situation is similar with emacs-w32 and emacs-nox, but with fewer threads.
In general, is there a way I can understand where all the threads come from? My
reason for asking is that we're still getting emacs bug reports on 64-bit
Cygwin, with random crashes or assertion violations that are "impossible"
according to the gdb backtraces. [*] So I'm wondering whether they're caused by
interference from other threads.
Or is there some other plausible explanation for "impossible" crashes? This
can't just be a result of a gdb bug, because in at least one case the assertion
can be shown to be valid by using printf instead of gdb.
Ken
[*] By "impossible" I mean that examination of the relevant variables in gdb
shows that the assertions are in fact true. Two ongoing examples are
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=18438
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=18769
=============thread apply all bt==============================
Thread 12 (Thread 6288.0x554):
#0 0x0000000077b50591 in ntdll!DbgBreakPoint ()
at /c/Windows/SYSTEM32/ntdll.dll
#1 0x0000000077bf7f48 in ntdll!DbgUiRemoteBreakin ()
at /c/Windows/SYSTEM32/ntdll.dll
#2 0x00000000779f59ed in KERNEL32!BaseThreadInitThunk ()
at /c/Windows/system32/kernel32.dll
#3 0x0000000077b2c541 in ntdll!RtlUserThreadStart ()
at /c/Windows/SYSTEM32/ntdll.dll
#4 0x0000000000000000 in ()
Thread 11 (Thread 6288.0x2280):
#0 0x0000000077b52bba in ntdll!ZwWaitForWorkViaWorkerFactory ()
at /c/Windows/SYSTEM32/ntdll.dll
#1 0x0000000077b1fe3b in ntdll!RtlValidateHeap ()
at /c/Windows/SYSTEM32/ntdll.dll
#2 0x000000018004619b in _cygtls::call2(unsigned int (*)(void*, void*), void*,
void*) (this=0x2000002, func=0x0, arg=0x5e82d0, buf=buf AT entry=0x47bcd50)
at /usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/cygtls.cc:100
#3 0x00000001800462f4 in _cygtls::call(unsigned int (*)(void*, void*), void*)
(func=<optimized out>, arg=<optimized out>)
at /usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/cygtls.cc:30
#4 0x00000000779f59ed in KERNEL32!BaseThreadInitThunk ()
at /c/Windows/system32/kernel32.dll
#5 0x0000000077b2c541 in ntdll!RtlUserThreadStart ()
at /c/Windows/SYSTEM32/ntdll.dll
#6 0x0000000000000000 in ()
Thread 10 (Thread 6288.0x22c0):
#0 0x0000000077b52bba in ntdll!ZwWaitForWorkViaWorkerFactory ()
at /c/Windows/SYSTEM32/ntdll.dll
#1 0x0000000077b1fe3b in ntdll!RtlValidateHeap ()
at /c/Windows/SYSTEM32/ntdll.dll
#2 0x000000018004619b in _cygtls::call2(unsigned int (*)(void*, void*), void*,
void*) (this=0x2000002, func=0x29000029, arg=0x5e82d0, buf=buf AT entry=0x4bbcd50)
at /usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/cygtls.cc:100
#3 0x00000001800462f4 in _cygtls::call(unsigned int (*)(void*, void*), void*)
(func=<optimized out>, arg=<optimized out>)
at /usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/cygtls.cc:30
#4 0x00000000779f59ed in KERNEL32!BaseThreadInitThunk ()
at /c/Windows/system32/kernel32.dll
#5 0x0000000077b2c541 in ntdll!RtlUserThreadStart ()
at /c/Windows/SYSTEM32/ntdll.dll
#6 0x0000000000000000 in ()
Thread 9 (Thread 6288.0x1e98):
#0 0x0000000077b515fa in ntdll!ZwDelayExecution ()
at /c/Windows/SYSTEM32/ntdll.dll
#1 0x000007fefda11203 in SleepEx () at /c/Windows/system32/KERNELBASE.dll
#2 0x000000018010d970 in thread_pipe(void*) (arg=0x600d2bfe0)
at /usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/select.cc:690
#3 0x0000000180044fc5 in cygthread::callfunc(bool) (this=this AT entry=0x1801d0500
<threads+352>, issimplestub=issimplestub AT entry=false)
at /usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/cygthread.cc:51
#4 0x000000018004552a in cygthread::stub(void*) (arg=arg AT entry=0x1801d0500
<threads+352>) at /usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/cygthread.cc:93
#5 0x000000018004619b in _cygtls::call2(unsigned int (*)(void*, void*), void*,
void*) (this=0x43bce00, func=
0x1800454d0 <cygthread::stub(void*)>, arg=0x1801d0500 <threads+352>,
buf=buf AT entry=0x43bcd50) at
/usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/cygtls.cc:100
#6 0x00000001800462f4 in _cygtls::call(unsigned int (*)(void*, void*), void*)
(func=<optimized out>, arg=<optimized out>)
at /usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/cygtls.cc:30
#7 0x00000000779f59ed in KERNEL32!BaseThreadInitThunk ()
at /c/Windows/system32/kernel32.dll
#8 0x0000000077b2c541 in ntdll!RtlUserThreadStart ()
at /c/Windows/SYSTEM32/ntdll.dll
#9 0x0000000000000000 in ()
Thread 8 (Thread 6288.0x1ae4):
#0 0x0000000077b5186a in ntdll!ZwWaitForMultipleObjects ()
at /c/Windows/SYSTEM32/ntdll.dll
#1 0x000007fefda11430 in KERNELBASE!GetCurrentProcess ()
at /c/Windows/system32/KERNELBASE.dll
#2 0x0000000000000000 in ()
Thread 7 (Thread 6288.0x1bac):
#0 0x0000000077b5134a in ntdll!ZwRemoveIoCompletion ()
at /c/Windows/SYSTEM32/ntdll.dll
#1 0x000007fefd095941 in () at /c/Windows/System32/mswsock.dll
#2 0x0000000000000000 in ()
Thread 6 (Thread 6288.0xf40):
#0 0x0000000077b512fa in ntdll!ZwWaitForSingleObject ()
at /c/Windows/SYSTEM32/ntdll.dll
#1 0x000007fefda110dc in WaitForSingleObjectEx ()
at /c/Windows/system32/KERNELBASE.dll
#2 0x000000018013db94 in timer_thread(void*) (x=0x37ba9d8)
at /usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/timer.cc:145
#3 0x0000000180044fc5 in cygthread::callfunc(bool) (this=this AT entry=0x1801d0450
<threads+176>, issimplestub=issimplestub AT entry=false)
at /usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/cygthread.cc:51
#4 0x000000018004552a in cygthread::stub(void*) (arg=arg AT entry=0x1801d0450
<threads+176>) at /usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/cygthread.cc:93
#5 0x000000018004619b in _cygtls::call2(unsigned int (*)(void*, void*), void*,
void*) (this=0x37bce00, func=
0x1800454d0 <cygthread::stub(void*)>, arg=0x1801d0450 <threads+176>,
buf=buf AT entry=0x37bcd50) at
/usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/cygtls.cc:100
#6 0x00000001800462f4 in _cygtls::call(unsigned int (*)(void*, void*), void*)
(func=<optimized out>, arg=<optimized out>)
at /usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/cygtls.cc:30
#7 0x00000000779f59ed in KERNEL32!BaseThreadInitThunk ()
at /c/Windows/system32/kernel32.dll
#8 0x0000000077b2c541 in ntdll!RtlUserThreadStart ()
at /c/Windows/SYSTEM32/ntdll.dll
#9 0x0000000000000000 in ()
Thread 5 (Thread 6288.0x1cc0):
#0 0x0000000077b515fa in ntdll!ZwDelayExecution ()
at /c/Windows/SYSTEM32/ntdll.dll
#1 0x000007fefda11203 in SleepEx () at /c/Windows/system32/KERNELBASE.dll
#2 0x000000018010d970 in thread_pipe(void*) (arg=0x600045f20)
at /usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/select.cc:690
#3 0x0000000180044fc5 in cygthread::callfunc(bool) (this=this AT entry=0x1801d03f8
<threads+88>, issimplestub=issimplestub AT entry=false)
at /usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/cygthread.cc:51
#4 0x000000018004552a in cygthread::stub(void*) (arg=arg AT entry=0x1801d03f8
<threads+88>) at /usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/cygthread.cc:93
#5 0x000000018004619b in _cygtls::call2(unsigned int (*)(void*, void*), void*,
void*) (this=0x33bce00, func=
0x1800454d0 <cygthread::stub(void*)>, arg=0x1801d03f8 <threads+88>,
buf=buf AT entry=0x33bcd50) at
/usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/cygtls.cc:100
#6 0x00000001800462f4 in _cygtls::call(unsigned int (*)(void*, void*), void*)
(func=<optimized out>, arg=<optimized out>)
at /usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/cygtls.cc:30
#7 0x00000000779f59ed in KERNEL32!BaseThreadInitThunk ()
at /c/Windows/system32/kernel32.dll
#8 0x0000000077b2c541 in ntdll!RtlUserThreadStart ()
at /c/Windows/SYSTEM32/ntdll.dll
#9 0x0000000000000000 in ()
Thread 4 (Thread 6288.0x620):
#0 0x0000000077b5186a in ntdll!ZwWaitForMultipleObjects ()
at /c/Windows/SYSTEM32/ntdll.dll
#1 0x000007fefda11430 in KERNELBASE!GetCurrentProcess ()
at /c/Windows/system32/KERNELBASE.dll
#2 0x0000000000000000 in ()
Thread 3 (Thread 6288.0x50c):
#0 0x0000000077b5186a in ntdll!ZwWaitForMultipleObjects ()
at /c/Windows/SYSTEM32/ntdll.dll
#1 0x0000000077b1b037 in ntdll!TpIsTimerSet () at /c/Windows/SYSTEM32/ntdll.dll
#2 0x00000000779f59ed in KERNEL32!BaseThreadInitThunk ()
at /c/Windows/system32/kernel32.dll
#3 0x0000000077b2c541 in ntdll!RtlUserThreadStart ()
at /c/Windows/SYSTEM32/ntdll.dll
#4 0x0000000000000000 in ()
Thread 2 (Thread 6288.0x4ec):
#0 0x0000000077b5131a in ntdll!ZwReadFile () at /c/Windows/SYSTEM32/ntdll.dll
#1 0x000007fefda11a7a in ReadFile () at /c/Windows/system32/KERNELBASE.dll
#2 0x00000000779f0a19 in ReadFile () at /c/Windows/system32/kernel32.dll
#3 0x00000001801197c2 in wait_sig(void*) ()
at /usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/sigproc.cc:1239
#4 0x0000000180044fc5 in cygthread::callfunc(bool) (this=this AT entry=0x1801d03a0
<threads>, issimplestub=issimplestub AT entry=false)
at /usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/cygthread.cc:51
#5 0x000000018004552a in cygthread::stub(void*) (arg=arg AT entry=0x1801d03a0
<threads>) at /usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/cygthread.cc:93
#6 0x000000018004619b in _cygtls::call2(unsigned int (*)(void*, void*), void*,
void*) (this=0x23ace00, func=
0x1800454d0 <cygthread::stub(void*)>, arg=0x1801d03a0 <threads>,
buf=buf AT entry=0x23acd50) at
/usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/cygtls.cc:100
#7 0x00000001800462f4 in _cygtls::call(unsigned int (*)(void*, void*), void*)
(func=<optimized out>, arg=<optimized out>)
at /usr/src/debug/cygwin-1.7.32-1/winsup/cygwin/cygtls.cc:30
#8 0x00000000779f59ed in KERNEL32!BaseThreadInitThunk ()
at /c/Windows/system32/kernel32.dll
#9 0x0000000077b2c541 in ntdll!RtlUserThreadStart ()
at /c/Windows/SYSTEM32/ntdll.dll
#10 0x0000000000000000 in ()
Thread 1 (Thread 6288.0x2304):
#0 0x0000000077b5186a in ntdll!ZwWaitForMultipleObjects ()
at /c/Windows/SYSTEM32/ntdll.dll
#1 0x000007fefda11430 in KERNELBASE!GetCurrentProcess ()
at /c/Windows/system32/KERNELBASE.dll
#2 0x0000000000000001 in ()
Continuing.
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