cygwin 1.5.20-1, spinning pdksh, 100% CPU

Ernie Coskrey Ernie.Coskrey@steeleye.com
Tue Aug 7 13:14:00 GMT 2007 

> -----Original Message-----
> From: Igor Peshansky [mailto:pechtcha@cs.nyu.edu]
> Sent: Monday, August 06, 2007 5:59 PM
> To: Ernie Coskrey
> Cc: cygwin@cygwin.com
> Subject: RE: cygwin 1.5.20-1, spinning pdksh, 100% CPU
> 
> On Mon, 6 Aug 2007, Ernie Coskrey wrote:
> 
> > > Quite possibly.  There were changes to signal handling since
> 1.5.20,
> > > IIRC. Unless I'm mistaken, there's even a patch for a race
> condition
> > > in process handling code (though it's not in 1.5.24, I think).
> >
> > I just want to make sure I understand this - are you talking about a
> > change that has been made since 1.5.24-2 was released, which is in
> the
> > snapshot view now?  Or did you mean a fix that was made sometime
> between
> > 1.5.20-1 and 1.5.24-2.
> 
> I meant the former, but I don't know if these changes have actually
> fixed
> your problem.

I'll download the latest snapshot and look at what's changed.  Do you
remember where the changes might be located - I'd guess somewhere in
sigproc.cc, exception.cc, and/or wait.cc.  Or if you remember the date
and/or subject of the email discussion that I could look at, that would
be very helpful as well.

> 
> Any particulars about the machines on which this happens?  Are they
> multi-core?  I don't recall seeing a cygcheck output from an affected
> machine...
> 	Igor

This happens on a variety of hardware - single-CPU is where it's the
biggest problem since the system becomes nearly unusable.  But we've
seen it on multi-core and multi-physical-CPU systems as well.

Here's cygcheck from one of the systems where it's happened a few times:

Cygwin Configuration Diagnostics
Current System Time: Tue Aug 07 09:01:03 2007

Windows 2003 Server Ver 5.2 Build 3790 Service Pack 2

Running in Terminal Service session

Path:   c:\WINDOWS\system32
        c:\WINDOWS
        c:\WINDOWS\System32\Wbem
        c:\Program Files\SUperior SU
        c:\Program Files\Microsoft SQL Server\80\Tools\BINN
        C:\LK\bin
        c:\SDR
        c:\SDR\support
        c:\Program files\Debugging Tools for Windows

SysDir: C:\WINDOWS\system32
WinDir: C:\WINDOWS

HOME = '/home/Administrator'

Use '-r' to scan registry

a:  fd             N/A    N/A
c:  hd  NTFS      8662Mb  84% CP CS UN PA FC
d:  net NTFS     17351Mb  90% CP CS UN PA FC     BUILD
e:  cd             N/A    N/A
h:  hd  NTFS      4337Mb   1% CP CS UN PA FC     Shared_H
i:  hd             N/A    N/A
j:  hd  NTFS     17367Mb   1% CP CS UN PA FC     Shared_J
k:  hd  NTFS     17367Mb   1% CP CS UN PA FC     Shared_K
l:  hd  NTFS     17343Mb   1% CP CS UN PA FC     Shared_L
n:  hd  NTFS     17476Mb   1% CP CS UN PA FC     Shared_N
o:  hd  NTFS      1027Mb   1% CP CS UN PA FC     Shared_O
p:  hd             N/A    N/A
r:  hd             N/A    N/A
s:  hd  NTFS     69954Mb   1% CP CS UN PA FC     iSCSI_S
t:  hd  NTFS     69954Mb   1% CP CS UN PA FC     ISCSI_T
v:  net NTFS      8096Mb  73% CP CS UN PA FC
w:  net NTFS   1402454Mb  34% CP CS    PA        coskrey
x:  net NTFS     17355Mb  26% CP CS UN PA FC     Dev_Y
y:  hd  NTFS      8665Mb   7% CP CS UN PA FC     Vol_Y
z:  hd             N/A    N/A


Found: C:\LK\bin\awk.exe
Found: C:\LK\bin\bash.exe
Found: C:\LK\bin\cat.exe
Found: C:\LK\bin\cp.exe
Not Found: cpp (good!)
Not Found: crontab
Found: C:\LK\bin\find.exe
Not Found: gcc
Found: C:\LK\bin\gdb.exe
Found: C:\LK\bin\grep.exe
Found: C:\LK\bin\kill.exe
Found: c:\Program files\Debugging Tools for Windows\kill.exe
Not Found: ld
Found: C:\LK\bin\ls.exe
Not Found: make
Found: C:\LK\bin\mv.exe
Not Found: patch
Found: C:\LK\bin\perl.exe
Found: C:\LK\bin\rm.exe
Found: C:\LK\bin\sed.exe
Not Found: ssh
Found: C:\LK\bin\sh.exe
Found: C:\LK\bin\tar.exe
Found: C:\LK\bin\test.exe
Found: C:\LK\bin\vi.exe
Found: C:\LK\bin\vim.exe

   56k 2007/07/14 C:\LK\bin\cygbz2-1.dll
    7k 2007/07/14 C:\LK\bin\cygcharset-1.dll
    7k 2007/07/14 C:\LK\bin\cygcrypt-0.dll
   40k 2007/07/14 C:\LK\bin\cygform-8.dll
   45k 2007/07/14 C:\LK\bin\cygform5.dll
   35k 2007/07/14 C:\LK\bin\cygform6.dll
   48k 2007/07/14 C:\LK\bin\cygform7.dll
   28k 2007/07/14 C:\LK\bin\cyggdbm-3.dll
   30k 2007/07/14 C:\LK\bin\cyggdbm-4.dll
   19k 2007/07/14 C:\LK\bin\cyggdbm.dll
   15k 2007/07/14 C:\LK\bin\cyggdbm_compat-3.dll
   15k 2007/07/14 C:\LK\bin\cyggdbm_compat-4.dll
   17k 2007/07/14 C:\LK\bin\cyghistory4.dll
   29k 2007/07/14 C:\LK\bin\cyghistory5.dll
   24k 2007/07/14 C:\LK\bin\cyghistory6.dll
  947k 2007/07/14 C:\LK\bin\cygiconv-2.dll
   22k 2007/07/14 C:\LK\bin\cygintl-1.dll
   37k 2007/07/14 C:\LK\bin\cygintl-2.dll
   31k 2007/07/14 C:\LK\bin\cygintl-3.dll
   21k 2007/07/14 C:\LK\bin\cygintl.dll
   21k 2007/07/14 C:\LK\bin\cygmenu-8.dll
   26k 2007/07/14 C:\LK\bin\cygmenu5.dll
   20k 2007/07/14 C:\LK\bin\cygmenu6.dll
   29k 2007/07/14 C:\LK\bin\cygmenu7.dll
   67k 2007/07/14 C:\LK\bin\cygncurses++-8.dll
  156k 2007/07/14 C:\LK\bin\cygncurses++5.dll
  175k 2007/07/14 C:\LK\bin\cygncurses++6.dll
  227k 2007/07/14 C:\LK\bin\cygncurses-8.dll
  226k 2007/07/14 C:\LK\bin\cygncurses5.dll
  202k 2007/07/14 C:\LK\bin\cygncurses6.dll
  224k 2007/07/14 C:\LK\bin\cygncurses7.dll
   12k 2007/07/14 C:\LK\bin\cygpanel-8.dll
   15k 2007/07/14 C:\LK\bin\cygpanel5.dll
   12k 2007/07/14 C:\LK\bin\cygpanel6.dll
   19k 2007/07/14 C:\LK\bin\cygpanel7.dll
  176k 2007/07/14 C:\LK\bin\cygpcre-0.dll
  299k 2007/07/14 C:\LK\bin\cygpcrecpp-0.dll
    6k 2007/07/14 C:\LK\bin\cygpcreposix-0.dll
   22k 2007/07/14 C:\LK\bin\cygpopt-0.dll
  108k 2007/07/14 C:\LK\bin\cygreadline4.dll
  148k 2007/07/14 C:\LK\bin\cygreadline5.dll
  152k 2007/07/14 C:\LK\bin\cygreadline6.dll
   65k 2007/07/14 C:\LK\bin\cygz.dll
 1836k 2007/07/14 C:\LK\bin\cygwin1.dll
    Cygwin DLL version info:
        DLL version: 1.5.20
        DLL epoch: 19
        DLL bad signal mask: 19005
        DLL old termios: 5
        DLL malloc env: 28
        API major: 0
        API minor: 156
        Shared data: 4
        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 Jul 10 15:19:52 EDT 2006
        Shared id: cygwin1S4


Can't find the cygrunsrv utility, skipping services check.


Cygwin Package Information
No setup information found
Use -h to see help about each section
'id' program not found
'id' program not found
cygcheck: dump_sysinfo: GetVolumeInformation() for drive I: failed: 5
cygcheck: dump_sysinfo: GetVolumeInformation() for drive P: failed: 5
cygcheck: dump_sysinfo: GetVolumeInformation() for drive R: failed: 5
cygcheck: dump_sysinfo: GetVolumeInformation() for drive Z: failed: 87


Ernie



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