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Date:	31 Oct 2001 13:23:18 -0500
Message-ID:	<20011031182318.15582.qmail@lizard.curl.com>
From:	Jonathan Kamens <jik AT curl DOT com>
To:	cygwin-developers AT cygwin DOT com
Subject:	"make -j2" hang is not fixed in current repository

I suspect you don't want to hear this ;-(, but I just saw one of our
automated "make -j2" builds hang in the same fashion it always has in
the past, with a cygwin1.dll built from the current repository.

Here are the stacks of all the hung make processes.  This is the
lowermost one:

  Thread 4 (thread 116.0x113):
  #0  0x77f762e9 in ?? ()
  #1  0x77f04ede in ?? ()

  Thread 3 (thread 116.0x10d):
  #0  0x77f682cb in ?? ()
  #1  0x77f1cd76 in ?? ()
  #2  0x6105c115 in wait_subproc ()
      at /u/jik/cygwin-cvs/src/winsup/cygwin/sigproc.cc:1243
  #3  0x610052aa in thread_stub (arg=0x610a2a40)
      at /u/jik/cygwin-cvs/src/winsup/cygwin/debug.cc:98
  #4  0x77f04ede in ?? ()

  Thread 2 (thread 116.0x126):
  #0  0x77f682cb in ?? ()
  #1  0x77f1cd76 in ?? ()
  #2  0x6105bdb9 in wait_sig ()
      at /u/jik/cygwin-cvs/src/winsup/cygwin/sigproc.cc:1128
  #3  0x610052aa in thread_stub (arg=0x610a2a40)
      at /u/jik/cygwin-cvs/src/winsup/cygwin/debug.cc:98
  #4  0x77f04ede in ?? ()

  Thread 1 (thread 116.0x6b):
  #0  0x77f67a5b in ?? ()
  #1  0x61053064 in peek_pipe (s=0x242f114, ignra=0, guard_mutex=0x1b4)
      at /u/jik/cygwin-cvs/src/winsup/cygwin/select.cc:453
  #2  0x61053416 in fhandler_pipe::ready_for_read (this=0x61545228, fd=6, 
      howlong=4294967295, ignra=0)
      at /u/jik/cygwin-cvs/src/winsup/cygwin/select.cc:512
  #3  0x61061e1b in _read (fd=6, ptr=0x242f223, len=1)
      at /u/jik/cygwin-cvs/src/winsup/cygwin/syscalls.cc:315
  #4  0x6108bbb6 in read (fd=6, buf=0x242f223, cnt=1)
      at /u/jik/cygwin-cvs/src/newlib/libc/syscalls/sysread.c:15
  #5  0x61011234 in sigdelayed ()
      at /u/jik/cygwin-cvs/src/winsup/cygwin/exceptions.cc:1229
  #6  0x402704 in _size_of_stack_reserve__ ()
  #7  0x41ad27 in _size_of_stack_reserve__ ()
  #8  0x41a1a1 in _size_of_stack_reserve__ ()
  #9  0x418aba in _size_of_stack_reserve__ ()
  #10 0x418710 in _size_of_stack_reserve__ ()
  #11 0x410bdc in _size_of_stack_reserve__ ()
  #12 0x610044fd in dll_crt0_1 ()
      at /u/jik/cygwin-cvs/src/winsup/cygwin/dcrt0.cc:769
  #13 0x610047d1 in _dll_crt0 ()
      at /u/jik/cygwin-cvs/src/winsup/cygwin/dcrt0.cc:850
  #14 0x61004810 in dll_crt0 (uptr=0x0)
      at /u/jik/cygwin-cvs/src/winsup/cygwin/dcrt0.cc:862
  #15 0x4254f7 in _size_of_stack_reserve__ ()
  #16 0x40103d in _size_of_stack_reserve__ ()
  #17 0x77f1b9ea in ?? ()
  #0  0x77f762e9 in ?? ()

This is its parent, which has "I" in the first column of its ps
output (the others don't):

  Thread 4 (thread 205.0xaf):
  #0  0x77f762e9 in ?? ()
  #1  0x77f04ede in ?? ()

  Thread 3 (thread 205.0x107):
  #0  0x77f682cb in ?? ()
  #1  0x77f1cd76 in ?? ()
  #2  0x6105c115 in wait_subproc ()
      at /u/jik/cygwin-cvs/src/winsup/cygwin/sigproc.cc:1243
  #3  0x610052aa in thread_stub (arg=0x610a2a40)
      at /u/jik/cygwin-cvs/src/winsup/cygwin/debug.cc:98
  #4  0x77f04ede in ?? ()

  Thread 2 (thread 205.0xe8):
  #0  0x77f682cb in ?? ()
  #1  0x77f1cd76 in ?? ()
  #2  0x6105bdb9 in wait_sig ()
      at /u/jik/cygwin-cvs/src/winsup/cygwin/sigproc.cc:1128
  #3  0x610052aa in thread_stub (arg=0x610a2a40)
      at /u/jik/cygwin-cvs/src/winsup/cygwin/debug.cc:98
  #4  0x77f04ede in ?? ()

  Thread 1 (thread 205.0xfe):
  #0  0x77f67f07 in ?? ()
  #1  0x61012b6b in fhandler_base::raw_read (this=0x61545668, ptr=0x242ef23, 
      ulen=1) at /u/jik/cygwin-cvs/src/winsup/cygwin/fhandler.cc:231
  #2  0x6101347c in fhandler_base::read (this=0x61545668, in_ptr=0x242ef23, 
      in_len=513) at /u/jik/cygwin-cvs/src/winsup/cygwin/fhandler.cc:484
  #3  0x610440a7 in fhandler_pipe::read (this=0x61545668, in_ptr=0x0, in_len=513)
      at /u/jik/cygwin-cvs/src/winsup/cygwin/pipe.cc:54
  #4  0x61061f0e in _read (fd=6, ptr=0x242ef23, len=1)
      at /u/jik/cygwin-cvs/src/winsup/cygwin/syscalls.cc:334
  #5  0x6108bbb6 in read (fd=6, buf=0x242ef23, cnt=1)
      at /u/jik/cygwin-cvs/src/newlib/libc/syscalls/sysread.c:15
  #6  0x61011234 in sigdelayed ()
      at /u/jik/cygwin-cvs/src/winsup/cygwin/exceptions.cc:1229
  #7  0x402704 in _size_of_stack_reserve__ ()
  #8  0x41ad27 in _size_of_stack_reserve__ ()
  #9  0x41a1a1 in _size_of_stack_reserve__ ()
  #10 0x418aba in _size_of_stack_reserve__ ()
  #11 0x41a5ce in _size_of_stack_reserve__ ()
  #12 0x4197fa in _size_of_stack_reserve__ ()
  #13 0x418aba in _size_of_stack_reserve__ ()
  #14 0x41a5ce in _size_of_stack_reserve__ ()
  #15 0x4197fa in _size_of_stack_reserve__ ()
  #16 0x418aba in _size_of_stack_reserve__ ()
  #17 0x41a5ce in _size_of_stack_reserve__ ()
  #18 0x4197fa in _size_of_stack_reserve__ ()
  #19 0x418aba in _size_of_stack_reserve__ ()
  #20 0x418710 in _size_of_stack_reserve__ ()
  #21 0x411352 in _size_of_stack_reserve__ ()
  #22 0x610044fd in dll_crt0_1 ()
      at /u/jik/cygwin-cvs/src/winsup/cygwin/dcrt0.cc:769
  #23 0x610047d1 in _dll_crt0 ()
      at /u/jik/cygwin-cvs/src/winsup/cygwin/dcrt0.cc:850
  #24 0x61004810 in dll_crt0 (uptr=0x0)
      at /u/jik/cygwin-cvs/src/winsup/cygwin/dcrt0.cc:862
  #25 0x4254f7 in _size_of_stack_reserve__ ()
  #26 0x40103d in _size_of_stack_reserve__ ()
  #27 0x77f1b9ea in ?? ()
  #0  0x77f762e9 in ?? ()

And this is its parent, the top-most make process:

  Thread 4 (thread 230.0xd1):
  #0  0x77f762e9 in ?? ()
  #1  0x77f04ede in ?? ()

  Thread 3 (thread 230.0x12b):
  #0  0x77f682cb in ?? ()
  #1  0x77f1cd76 in ?? ()
  #2  0x6105c115 in wait_subproc ()
      at /u/jik/cygwin-cvs/src/winsup/cygwin/sigproc.cc:1243
  #3  0x610052aa in thread_stub (arg=0x610a2a40)
      at /u/jik/cygwin-cvs/src/winsup/cygwin/debug.cc:98
  #4  0x77f04ede in ?? ()

  Thread 2 (thread 230.0xe4):
  #0  0x77f682cb in ?? ()
  #1  0x77f1cd76 in ?? ()
  #2  0x6105bdb9 in wait_sig ()
      at /u/jik/cygwin-cvs/src/winsup/cygwin/sigproc.cc:1128
  #3  0x610052aa in thread_stub (arg=0x610a2a40)
      at /u/jik/cygwin-cvs/src/winsup/cygwin/debug.cc:98
  #4  0x77f04ede in ?? ()

  Thread 1 (thread 230.0x114):
  #0  0x77f67a5b in ?? ()
  #1  0x61053064 in peek_pipe (s=0x242e834, ignra=0, guard_mutex=0x200)
      at /u/jik/cygwin-cvs/src/winsup/cygwin/select.cc:453
  #2  0x61053416 in fhandler_pipe::ready_for_read (this=0x61543480, fd=6, 
      howlong=4294967295, ignra=0)
      at /u/jik/cygwin-cvs/src/winsup/cygwin/select.cc:512
  #3  0x61061e1b in _read (fd=6, ptr=0x242e943, len=1)
      at /u/jik/cygwin-cvs/src/winsup/cygwin/syscalls.cc:315
  #4  0x6108bbb6 in read (fd=6, buf=0x242e943, cnt=1)
      at /u/jik/cygwin-cvs/src/newlib/libc/syscalls/sysread.c:15
  #5  0x40d034 in _size_of_stack_reserve__ ()
  #6  0x402704 in _size_of_stack_reserve__ ()
  #7  0x41ad27 in _size_of_stack_reserve__ ()
  #8  0x41a1a1 in _size_of_stack_reserve__ ()
  #9  0x418aba in _size_of_stack_reserve__ ()
  #10 0x41a5ce in _size_of_stack_reserve__ ()
  #11 0x4197fa in _size_of_stack_reserve__ ()
  #12 0x418aba in _size_of_stack_reserve__ ()
  #13 0x41a5ce in _size_of_stack_reserve__ ()
  #14 0x4197fa in _size_of_stack_reserve__ ()
  #15 0x418aba in _size_of_stack_reserve__ ()
  #16 0x41a5ce in _size_of_stack_reserve__ ()
  #17 0x4197fa in _size_of_stack_reserve__ ()
  #18 0x418aba in _size_of_stack_reserve__ ()
  #19 0x41a5ce in _size_of_stack_reserve__ ()
  #20 0x4197fa in _size_of_stack_reserve__ ()
  #21 0x418aba in _size_of_stack_reserve__ ()
  #22 0x41a5ce in _size_of_stack_reserve__ ()
  #23 0x4197fa in _size_of_stack_reserve__ ()
  #24 0x418aba in _size_of_stack_reserve__ ()
  #25 0x41a5ce in _size_of_stack_reserve__ ()
  #26 0x4197fa in _size_of_stack_reserve__ ()
  #27 0x418aba in _size_of_stack_reserve__ ()
  #28 0x41a5ce in _size_of_stack_reserve__ ()
  #29 0x4197fa in _size_of_stack_reserve__ ()
  #30 0x418aba in _size_of_stack_reserve__ ()
  #31 0x41a5ce in _size_of_stack_reserve__ ()
  #32 0x4197fa in _size_of_stack_reserve__ ()
  #33 0x418aba in _size_of_stack_reserve__ ()
  #34 0x41a5ce in _size_of_stack_reserve__ ()
  #35 0x4197fa in _size_of_stack_reserve__ ()
  #36 0x418aba in _size_of_stack_reserve__ ()
  #37 0x418710 in _size_of_stack_reserve__ ()
  #38 0x411352 in _size_of_stack_reserve__ ()
  #39 0x610044fd in dll_crt0_1 ()
      at /u/jik/cygwin-cvs/src/winsup/cygwin/dcrt0.cc:769
  #40 0x610047d1 in _dll_crt0 ()
      at /u/jik/cygwin-cvs/src/winsup/cygwin/dcrt0.cc:850
  #41 0x61004810 in dll_crt0 (uptr=0x0)
      at /u/jik/cygwin-cvs/src/winsup/cygwin/dcrt0.cc:862
  #42 0x4254f7 in _size_of_stack_reserve__ ()
  #43 0x40103d in _size_of_stack_reserve__ ()
  #44 0x77f1b9ea in ?? ()
  #0  0x77f762e9 in ?? ()

Note that I never got far enough in my testing to confirm that the bug
was fixed right when cgf first said he'd checked in a fix; this is the
first time I've really done extensive testing.  This makes me suspect
that perhaps the bug *was* fixed then, especially since cgf managed to
duplicate the problem before the fix and couldn't duplicate it
afterwards, but somehow got "unfixed" in the meantime.

What information can I extract from these hung processes that will
help determine what's going on?

Thanks,

  jik

- Raw text -