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Re: mmap of large amount returns invalid pointer
On Mon, Mar 11, 2002 at 08:38:34PM -0800, Stephen Weeks wrote:
>
> I am experience a problem where mmap does not return -1, but the
> pointer returned is not to a valid chunk of memory. I have included a
> sample program, the output that I see, and the output of cygcheck
> below.
>
> I have tried this program both with and withouth the registry setting
> HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin\heap_chunk_in_mb
> which, when set, I have set to 512Mb. BTW, I notice that this
> registry value isn't checked for by cygcheck. That would seem
> useful.
>
> Even if I got the registry setting wrong, I would expect mmap to
> return -1 if it is unable to get the space.
This registry setting has absolutely no effect on mmap(). It affects
the application heap but the mmap memory is taken from the shared memory
area of the system which isn't controlled by Cygwin but only by Win32
itself.
I ran your below test application with slightly different values in
the `try' calls to reflect the size of the page file in my box.
However, before talking further about this I'd like you to run your
below test application again but this time under strace. Could
you please send the strace output to this list (it's not that long)?
Thanks in advance,
Corinna
> --------------------------------------------------------------------------------
>
> #include <stdio.h>
> #include <sys/mman.h>
> #include <unistd.h>
> #include <windows.h>
>
> void try (uint length) {
> void *p;
>
> fprintf(stderr, "attempting to mmap %u bytes ...", length);
> p = mmap (NULL, length,
> PROT_READ | PROT_WRITE,
> MAP_PRIVATE | MAP_ANON, -1, 0);
> if ((void*)-1 == p) {
> fprintf(stderr, " out of memory\n");
> exit(0);
> }
> fprintf(stderr, "zeroing ... ");
> memset(p, 0, length);
> fprintf(stderr, "unmapping ... ");
> munmap(p, length);
> fprintf(stderr, "succeeded\n");
> length *= 2;
> }
>
> int main (int argc, char **argv) {
> MEMORYSTATUS ms;
>
> ms.dwLength = sizeof(MEMORYSTATUS);
> GlobalMemoryStatus(&ms);
> fprintf(stderr, "TotalPhys: %ld\nAvailPhys: %ld\nTotalPageFile: %ld\nAvailPageFile: %ld\nTotalVirtual: %ld\nAvailVirtual: %ld\n",
> ms.dwTotalPhys,
> ms.dwAvailPhys,
> ms.dwTotalPageFile,
> ms.dwAvailPageFile,
> ms.dwTotalVirtual,
> ms.dwAvailVirtual);
> try(100000000);
> try(130000000);
> exit(0);
> }
>
> --------------------------------------------------------------------------------
>
> TotalPhys: 209113088
> AvailPhys: 166580224
> TotalPageFile: 309587968
> AvailPageFile: 275365888
> TotalVirtual: 2147352576
> AvailVirtual: 1589841920
> attempting to mmap 100000000 bytes ...zeroing ... unmapping ... succeeded
> attempting to mmap 130000000 bytes ...zeroing ... Segmentation fault (core dumped)
>
> --------------------------------------------------------------------------------
>
> Cygwin Win95/NT Configuration Diagnostics
> Current System Time: Mon Mar 11 19:42:08 2002
>
> Windows NT Ver 4.0 Build 1381 Service Pack 6
>
> Path: z:\cygwin\home\sweeks\bin
> z:\cygwin\sbin
> z:\cygwin\usr\sbin
> z:\cygwin\usr\local\bin
> z:\cygwin\bin
> z:\cygwin\bin
> c:\WINNT\system32
> c:\WINNT
>
> SysDir: C:\WINNT\System32
> WinDir: C:\WINNT
>
> CYGWIN = `binmode ntsec tty '
> HOME = `z:\cygwin\home\sweeks'
> MAKE_MODE = `unix'
> PWD = `/cygdrive/c'
> USER = `sweeks'
>
> COMPUTERNAME = `WINDOZE'
> COMSPEC = `C:\WINNT\system32\cmd.exe'
> HOMEDRIVE = `C:'
> HOMEPATH = `\'
> LOGONSERVER = `\\WINDOZE'
> MANPATH = `:/usr/ssl/man'
> NUMBER_OF_PROCESSORS = `1'
> OLDPWD = `/home/sweeks'
> OS2LIBPATH = `C:\WINNT\system32\os2\dll;'
> OS = `Windows_NT'
> PATHEXT = `.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH'
> PROCESSOR_ARCHITECTURE = `x86'
> PROCESSOR_IDENTIFIER = `x86 Family 15 Model 1 Stepping 2, GenuineIntel'
> PROCESSOR_LEVEL = `15'
> PROCESSOR_REVISION = `0102'
> PROMPT = `$P$G'
> PS1 = `\W% '
> SHLVL = `1'
> SYSTEMDRIVE = `C:'
> SYSTEMROOT = `C:\WINNT'
> TEMP = `c:\TEMP'
> TERM = `cygwin'
> TMP = `c:\TEMP'
> USERDOMAIN = `WINDOZE'
> USERNAME = `sweeks'
> USERPROFILE = `C:\WINNT\Profiles\sweeks'
> WINDIR = `C:\WINNT'
> _ = `/usr/bin/cygcheck'
>
> HKEY_CURRENT_USER\Software\Cygnus Solutions
> HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin
> (default) = 0x00000200
> HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin\mounts v2
> (default) = `/cygdrive'
> cygdrive flags = 0x00000022
> HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin\Program Options
> HKEY_CURRENT_USER\Software\Cygnus Solutions\CYGWIN.DLL setup
> HKEY_CURRENT_USER\Software\Cygnus Solutions\CYGWIN.DLL setup\b15.0
> HKEY_CURRENT_USER\Software\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts
> HKEY_CURRENT_USER\Software\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\00
> (default) = `C:'
> unix = `/'
> fbinary = 0x00000000
> fsilent = 0x00000000
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\mounts v2
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\mounts v2\/
> (default) = `z:\cygwin'
> flags = 0x0000000a
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\mounts v2\/usr/bin
> (default) = `z:/cygwin/bin'
> flags = 0x0000000a
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\mounts v2\/usr/lib
> (default) = `z:/cygwin/lib'
> flags = 0x0000000a
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\Program Options
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin B20
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin B20\B20.1
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\00
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\01
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\02
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\03
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\04
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\05
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\06
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\07
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\08
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\09
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\0A
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\0B
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\0C
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\0D
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\0E
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\0F
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\10
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\11
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\12
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\13
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\14
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\15
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\16
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\17
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\18
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\19
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\1A
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\1B
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\1C
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\1D
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\GNUPro
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\GNUPro\i586-cygwin32
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\GNUPro\i586-cygwin32\i586-cygwin32
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\GNUPro\i586-cygwin32\i586-cygwin32\cygwin-B20.1
> (default) = `z:\cygwin-b20.1\cygwin-b20'
> HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Cygnus Cygwin B20
> (default) = `C:\WINNT\IsUninst.exe -fz:\cygwin-b20.1\cygwin-b20\Uninst.isu'
> DisplayName = `Cygwin B20'
>
> a: fd N/A N/A
> c: hd NTFS 2043Mb 17% CP CS UN PA FC
> d: cd N/A N/A
> y: net NTFS 71228Mb 19% PA sweeks
> z: net NTFS 71228Mb 19% PA windows
>
> . /cygdrive user binmode,noumount
> z:\cygwin / system binmode
> z:/cygwin/bin /usr/bin system binmode
> z:/cygwin/lib /usr/lib system binmode
>
> Found: z:\cygwin\bin\bash.exe
> Found: z:\cygwin\bin\cat.exe
> Not Found: cpp (good!)
> Found: z:\cygwin\bin\find.exe
> Not Found: gcc
> Not Found: gdb
> Not Found: ld
> Found: z:\cygwin\bin\ls.exe
> Not Found: make
> Found: z:\cygwin\bin\sh.exe
>
> 751k 2002/03/09 z:\cygwin\usr\sbin\cygwin1.dll - os=4.0 img=1.0 sys=4.0
> "cygwin1.dll" v0.0 ts=2002/2/25 8:14
> Cygwin DLL version info:
> DLL version: 1.3.10
> DLL epoch: 19
> DLL bad signal mask: 19005
> DLL old termios: 5
> DLL malloc env: 28
> API major: 0
> API minor: 51
> Shared data: 3
> DLL identifier: cygwin1
> Mount registry: 2
> Cygnus registry name: Cygnus Solutions
> Cygwin registry name: Cygwin
> Program options name: Program Options
> Cygwin mount registry name: mounts v2
> Cygdrive flags: cygdrive flags
> Cygdrive prefix: cygdrive prefix
> Cygdrive default prefix:
> Build date: Mon Feb 25 11:14:34 EST 2002
> Shared id: cygwin1S3
>
> 19k 2002/02/21 z:\cygwin\bin\cyggdbm.dll - os=4.0 img=1.0 sys=4.0
> "cyggdbm.dll" v0.0 ts=2002/2/19 19:05
> 45k 2002/02/21 z:\cygwin\bin\cygform5.dll - os=4.0 img=1.0 sys=4.0
> "cygform5.dll" v0.0 ts=2001/4/24 22:28
> 26k 2002/02/21 z:\cygwin\bin\cygmenu5.dll - os=4.0 img=1.0 sys=4.0
> "cygmenu5.dll" v0.0 ts=2001/4/24 22:27
> 156k 2002/02/21 z:\cygwin\bin\cygncurses++5.dll - os=4.0 img=1.0 sys=4.0
> "cygncurses++5.dll" v0.0 ts=2001/4/24 22:29
> 226k 2002/02/21 z:\cygwin\bin\cygncurses5.dll - os=4.0 img=1.0 sys=4.0
> "cygncurses5.dll" v0.0 ts=2001/4/24 22:17
> 15k 2002/02/21 z:\cygwin\bin\cygpanel5.dll - os=4.0 img=1.0 sys=4.0
> "cygpanel5.dll" v0.0 ts=2001/4/24 22:27
> 35k 2002/02/21 z:\cygwin\bin\cygform6.dll - os=4.0 img=1.0 sys=4.0
> "cygform6.dll" v0.0 ts=2002/1/8 22:03
> 20k 2002/02/21 z:\cygwin\bin\cygmenu6.dll - os=4.0 img=1.0 sys=4.0
> "cygmenu6.dll" v0.0 ts=2002/1/8 22:03
> 175k 2002/02/21 z:\cygwin\bin\cygncurses++6.dll - os=4.0 img=1.0 sys=4.0
> "cygncurses++6.dll" v0.0 ts=2002/1/8 22:03
> 202k 2002/02/21 z:\cygwin\bin\cygncurses6.dll - os=4.0 img=1.0 sys=4.0
> "cygncurses6.dll" v0.0 ts=2002/1/8 22:03
> 12k 2002/02/21 z:\cygwin\bin\cygpanel6.dll - os=4.0 img=1.0 sys=4.0
> "cygpanel6.dll" v0.0 ts=2002/1/8 22:03
> 17k 2002/02/21 z:\cygwin\bin\cyghistory4.dll - os=4.0 img=1.0 sys=4.0
> "cyghistory4.dll" v0.0 ts=2001/1/6 20:34
> 108k 2002/02/21 z:\cygwin\bin\cygreadline4.dll - os=4.0 img=1.0 sys=4.0
> "cygreadline4.dll" v0.0 ts=2001/1/6 20:34
> 20k 2002/02/21 z:\cygwin\bin\cyghistory5.dll - os=4.0 img=1.0 sys=4.0
> "cyghistory5.dll" v0.0 ts=2002/1/12 17:27
> 121k 2002/02/21 z:\cygwin\bin\cygreadline5.dll - os=4.0 img=1.0 sys=4.0
> "cygreadline5.dll" v0.0 ts=2002/1/12 17:27
> 50k 2002/02/21 z:\cygwin\bin\cygz.dll - os=4.0 img=1.0 sys=4.0
> "cygz.dll" v0.0 ts=2002/1/20 11:41
> 21k 2002/02/21 z:\cygwin\bin\cygintl.dll - os=4.0 img=1.0 sys=4.0
> "cygintl.dll" v0.0 ts=2001/6/20 10:09
> 22k 2002/03/08 z:\cygwin\bin\cygintl-1.dll - os=4.0 img=1.0 sys=4.0
> "cygintl-1.dll" v0.0 ts=2001/12/13 1:28
> 40k 2002/03/08 z:\cygwin\bin\cygpcre.dll - os=4.0 img=1.0 sys=4.0
> "cygpcre.dll" v0.0 ts=2001/11/21 14:15
> 39k 2002/03/08 z:\cygwin\bin\cygpcreposix.dll - os=4.0 img=1.0 sys=4.0
> "cygpcreposix.dll" v0.0 ts=2001/11/21 14:15
> 621k 2002/03/09 z:\cygwin\bin\cygcrypto.dll - os=4.0 img=1.0 sys=4.0
> "cygcrypto.dll" v0.0 ts=2002/1/16 1:54
> 156k 2002/03/09 z:\cygwin\bin\cygssl.dll - os=4.0 img=1.0 sys=4.0
> "cygssl.dll" v0.0 ts=2002/1/16 1:54
> 751k 2002/03/09 z:\cygwin\bin\cygwin1.dll - os=4.0 img=1.0 sys=4.0
> "cygwin1.dll" v0.0 ts=2002/2/25 8:14
> Cygwin DLL version info:
> DLL version: 1.3.10
> DLL epoch: 19
> DLL bad signal mask: 19005
> DLL old termios: 5
> DLL malloc env: 28
> API major: 0
> API minor: 51
> Shared data: 3
> DLL identifier: cygwin1
> Mount registry: 2
> Cygnus registry name: Cygnus Solutions
> Cygwin registry name: Cygwin
> Program options name: Program Options
> Cygwin mount registry name: mounts v2
> Cygdrive flags: cygdrive flags
> Cygdrive prefix: cygdrive prefix
> Cygdrive default prefix:
> Build date: Mon Feb 25 11:14:34 EST 2002
> Shared id: cygwin1S3
>
>
> Cygwin Package Information
> Last downloaded files to: Z:\cygwin-packages
> Last downloaded files from: http://planetmirror.com/pub/sourceware/cygwin
>
> Package Version
> ash 20020131-1
> bash 2.05a-3
> cygrunsrv 0.95-1
> cygwin 1.3.10-1
> cygwin-src 1.3.10-1
> diff 0.0
> fileutils 4.1-1
> findutils 4.1
> gawk 3.0.4-1
> gdbm 1.8.0-4
> grep 2.5g
> groff 1.17.2-1
> gzip 1.3.2-1
> inetutils 1.3.2-17
> less 358-3
> libintl 0.10.38-3
> libintl1 0.10.40-1
> libncurses5 5.2-1
> libncurses6 5.2-8
> libreadline4 4.1-2
> libreadline5 4.2a-1
> login 1.4-3
> man 1.5g-2
> ncurses 5.2-8
> openssh 3.1p1-1
> openssl 0.9.6c-3
> pcre 3.7-1
> readline 4.2a-1
> sed 3.02-1
> sh-utils 2.0-2
> tar 1.13.19-1
> termcap 20010825-1
> terminfo 5.2-1
> textutils 2.0.21-1
> w32api 1.2-1
> which 1.5-1
> zlib 1.1.3-7
>
> Use -h to see help about each section
>
> --
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--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Developer mailto:cygwin@cygwin.com
Red Hat, Inc.
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