Mail Archives: cygwin/2003/02/08/17:48:09
Works for me on Win2000Pro+SP3/PIII.
> -----Original Message-----
> From: Victor Antonovich [mailto:avmlink AT vlink DOT ru]
> Sent: Saturday, February 08, 2003 5:18 PM
> To: cygwin AT cygwin DOT com
> Subject: 1.3.19: fork() strange memory leak under W2K
>
>
> Hello!
>
> Some time ago, when I was using at home 1.3.18 version of
> CygWin under Windows 2000 Workstation + SP3, I
> discovered that every command execution lead to some memory
> leak. It's especially noticeably when I try to run large
> scripts (like "configure") - the memory loading (as viewed
> in Task Manager) grow to its physical size and next I
> get message like this:
>
> 0 [main] sh 35620 sync_with_child: child 35636(0xDC)
> died before initialization with status code 0x80
> 6847 [main] sh 35620 sync_with_child: *** child state
> waiting for longjmp
> ./../ltconfig: fork: Resource temporarily unavailable
>
> After this, any process can't be started without rebooting
> (or killing other process).
>
> Recently, I upgraded my system to Windows 2000 Server +
> SP3 (with total precleanup) and CygWin 1.3.19, but problem is
> there as before. :(
>
> I made small test program which loops for 1000 times:
> --8<----------------------------------
> #!/bin/sh
> ctr=1
> while test `expr "$ctr"` -lt 1000; do
> ctr=`expr $ctr + 1`
> # ps > /dev/null
> done
> --8<----------------------------------
>
> The result:
> --8<----------------------------------
> $ ./test
> 0 [main] sh 1136 sync_with_child: child 35976(0x134)
> died before initialization with status code 0x80
> 1976 [main] sh 1136 sync_with_child: *** child state
> waiting for longjmp
> ./test: fork: Resource temporarily unavailable
> --8<----------------------------------
>
> After this, the memory leak average is 28 MBytes. When I
> uncomment line "ps > /dev/null" in this example, memory
> leak grow to 42 MBytes. Changing "ps" command in uncommented
> line on any external command not affect average memory leak.
> All looks like every fork() lead to leak about 13 KBytes of
> physical memory.
>
> All utilities don't indicate that memory leak exist in
> user space, that I decide that lost memory must be located in
> kernel space.
>
> It's very strange, but all this works nice at my work on
> computer with Windows 2000 Workstation + SP3! My home
> computer hardware is AMD Duron 800 MHz, Abit KT7A
> Motherboard, 256 MB RAM; at work Celeron 800 MHz, Acorp i815
> Motherboard, 128 MB RAM. The difference is also in the
> filesystems: FAT32 at home and NTFS at work.
>
> I found similar messages in cygwin mailing list archive,
> but without any response. By the way, same problem exist
> in MinGW minimalistic system (MSYS). Is there anybody who
> can say any considerations about this problem? The "cygcheck"
> program out is attached to this message.
>
> Regards,
> Victor.
>
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