GNU Make and command utility error with 100% cpu load.

[Oleksandr Gavenko]

Consider such simple Makefile:

var := $(shell command -v mv)

all:

When I call:

   $ make clean

I got output like

========================================
       5 [main] make 768! _pinfo::dup_proc_pipe: DuplicateHandle failed, 
pid 768, hProcess 0x6B5, wr_proc_pipe 0x750, Win32 error 6
========================================

and 100% cpu load by ntvdm.exe.

Further info:

   $ which command
which: no command in (/usr/sbin.....
   $ uname -a
CYGWIN_NT-5.1 rocky1 1.7.7(0.230/5/3) 2010-08-31 09:58 i686 Cygwin

 From procexp call graph view:

make.exe          3928 pid
+-> make.exe      4092 pid
     +-> ntvdm.exe 2856 pid

make:3928 threads:

TID  cpu% CSitch delta  Start address
460                     make.exe+0x1000
3000                    cygwin1.dll!setprogname+0x2610
1728                    cygwin1.dll!setprogname+0x2610

make:4092 threads:

TID  cpu% CSitch delta  Start address
1772                    make.exe+0x1000
3364                    cygwin1.dll!setprogname+0x2610

ntvdm.exe:2856 threads:

TID  cpu% CSitch delta  Start address
1456  49    717         ntvdm.exe!lsCdRomFile+0xf8d
624                     ntvdm.exe!host_com_close+0x689a
3476        26          ntvdm.exe!setAH+0x466
2976                    ntvdm.exe!cmdCheckTemp+0xba5
252         19          ntvdm.exe!cmdCheckTemp+0xadb
632         21          ntvdm.exe!cmdCheckTemp+0xadb

49-50 cpu% because 2 core cpu??
CSitch delta have different value near written by me.

Stack of ntvdm.exe!lsCdRomFile+0xf8d thread:

ntkrnlpa.exe!KiUnexpectedInterrupt+0x121
ntkrnlpa.exe!ZwYieldExecution+0x1c8e
hal.dll+0x2ef2
hal.dll!HalRequestSoftwareInterrupt+0x3c
ntkrnlpa.exe!IoBuildPartialMdl+0xed
ntkrnlpa.exe!NtReadFile+0x55d
ntkrnlpa.exe!KeReleaseInStackQueuedSpinLockFromDpcLevel+0xb74
ntdll.dll!KiFastSystemCallRet
ntvdm.exe!demWOWLFNEntry+0x120b
ntvdm.exe!getSI+0x4a
ntvdm.exe!getCS+0x47
ntvdm.exe!setCL+0xabf
ntvdm.exe!setDI+0x17e7
ntvdm.exe!IsCdRomFile+0x1103
kernel32.dll!RegisterWaitForInputIdle+0x49

Stack differ above ntdll.dll!KiFastSystemCallRet in different
break.

Data from procexp.exe written manually so I can misspell some.


Currently I found workarounds:

var := $(shell command -v mv || :)

or

var := $(shell sh -c command -v mv)

-- 
Best regards!


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