Another pipe-related problem?

Henry S. Thompson
Mon Nov 8 13:12:10 GMT 2021

Running on Windows-10 21H1

With Cygwin 3.3.0 and 3.3.1 I get a hang every time I try to launch XEmacs:

#0  0x00007ffdf31cd474 in ntdll!ZwQueryTimer ()
   from /c/Windows/SYSTEM32/ntdll.dll
#1  0x00000001800479fa in cygwait (object=<optimized out>, timeout=0xffff09a0,
    timeout@entry=0x0, mask=mask@entry=5)
    at /usr/x86_64-pc-cygwin/sys-root/usr/include/w32api/psdk_inc/intrin-impl.h:838
#2  0x000000018008f716 in cygwait (mask=<optimized out>,
    howlong=<optimized out>, h=<optimized out>)
    at /usr/src/debug/cygwin-3.3.1-1/winsup/cygwin/cygwait.h:45
#3  cygwait (howlong=<optimized out>, h=<optimized out>)
    at /usr/src/debug/cygwin-3.3.1-1/winsup/cygwin/cygwait.h:51
#4  fhandler_pipe::raw_read (this=0x18034fe80, ptr=0xffff0bc0,
    len=@0xffff0b40: 128)
    at /usr/src/debug/cygwin-3.3.1-1/winsup/cygwin/
#5  0x0000000180069244 in fhandler_base::read (this=0x18034fe80,
    in_ptr=0xffff0bc0, len=@0xffff0b40: 128)
    at /usr/src/debug/cygwin-3.3.1-1/winsup/cygwin/
#6  0x000000018013ffcc in read (fd=3, ptr=0xffff0bc0, len=<optimized out>)
    at /usr/src/debug/cygwin-3.3.1-1/winsup/cygwin/dtable.h:64
#7  0x000000018018e88b in _sigfe () at sigfe.s:35
#8  0x000000010066a11d in retry_read_1 (fildes=3, buf=0xffff0bc0, nbyte=128,
    allow_quit=0) at sysdep.c:2425
#9  0x000000010066a171 in retry_read (fildes=3, buf=0xffff0bc0, nbyte=128)
    at sysdep.c:2437
#10 0x0000000100494d86 in drain_signal_event_pipe () at event-unixoid.c:159
#11 0x000000010056d1dc in mswindows_need_event (badly_p=1) at event-msw.c:1432

This is an old executable, has worked since 2015 (!), but recompiling
didn't help.  Reverting to 3.2 lets it run again.

I can try to debug further if instructed in how to do so, but
constructing a simple test case is beyond me...

       Henry S. Thompson, School of Informatics, University of Edinburgh
      10 Crichton Street, Edinburgh EH8 9AB, SCOTLAND -- (44) 131 650-4440
                Fax: (44) 131 650-4587, e-mail:
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