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From: Vermessung AVT - Wolfgang Rieger <w DOT rieger AT avt DOT at>

To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>

Subject: gawk: Bad File Descriptor error with concurrent readonly access to a network file

Date: Fri, 25 Sep 2015 16:31:24 +0000

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--_002_AB495CE313664A489959F8DEF45069A90188AA0710EXSRV01avtims_
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We let thousands of tiles undergo the same time consuming processing tasks.=
 We use a multi core Windows 7 workstation running several tiles simultaneo=
usly in separate shell windows (parallel processing). A batch script contro=
ls the work flow of the task with gawk interpreting a number of setup / def=
inition files at run time for each tile / working step. From time to time w=
e get "Bad File Descriptor" errors in gawk (and, e.g., cat, head, tail) whe=
n accessing these setup files (they are only read). The full error line rea=
ds similar to:

(With job.awk and first access to datafile.txt at gawk source line 31:)
=A0=A0 "gawk: job.awk:31: fatal: error reading input file `datafile.txt': B=
ad file descriptor"
(With inline gawk scripts typically:)
=A0=A0 "gawk: fatal: error reading input file `datafile.txt': Bad file desc=
riptor"
(With something like "cat datafile.txt > destination":)
=A0=A0 "cat: datafile.txt: Bad file descriptor"

We use MS-Windows shell cmd.exe with batch scripts executing the gawk and o=
ther commands.
I tried to use gawk's BEGINFILE rule in order to trap that error. However, =
the BEGINFILE block is never entered, rather, gawk immediately crashes with=
 the "Bad File Descriptor" error.

I found nothing helpful in the web on that. Several updates to latest versi=
ons throughout last years brought no change in this behaviour.

Isolating and tracking down the problem with the test case included below I=
 found out:

1) Concurrent read access to the setup files was possible and worked fine w=
ith local files (24 hrs testing with millions of file accesses in 4 paralle=
l jobs).
2) However, when the file to be read (datafile.txt) is stored on a network =
share on a file server - which is the case in our working environment - the=
 error could be reproduced. The number of Bad file descriptor errors seems =
to be related to the work load at the server where the file resides.
3) The MS copy command shows no such error, even with network files. So we =
can substitute the cat's by copy's. For gawk, however, there is no shell al=
ternative.

It looks like there is a small time frame in opening files when the server =
file is non-accessible to other processes. If a parallel job happens to acc=
ess the same file within that short time period while another process is op=
ening it, the "Bad File Descriptor" error is thrown.


I would at least expect such a file opening error be submitted to a BEGINFI=
LE rule (as included in the test example) in gawk; but rather I hoped that =
Cygwin could cope with these situations.
Microsoft obviously is able to cope with these situations (if it is a concu=
rrent file access problem which I am sure is the case), since with copy ins=
tead of cat (or gawk) I never experienced such access problems.




Here is the test case I have used. It consists of 3 files:

datafile.txt=A0=A0=A0 A datafile filled with dummy content
chkParallelError.bat=A0=A0=A0=A0 The control Job which has to be started in=
 a cmd.exe shell window; it features 2 optional parameters:
First parameter is the datafile name which defaults to datafile.txt (eventu=
ally add a path to it if it is stored in a different directory, e.g. networ=
k share)
Second parameter is the number of parallel jobs which should be run, it def=
aults to the shell (cmd.exe) symbol NUMBER_OF_PROCESSORS, or to 4 if not se=
t. This should be chosen in accordance with the number of cores available (=
e.g. not exceeding 2*number of processors).
The syntax is MS Windows cmd.exe shell syntax of MS Windows 7.

The job chkParallelErrorJob.bat is started as many times as given in the nu=
mber of parallel jobs in separate shell windows (cmd.exe). There are 3 call=
s included that are currently all commented out with rem, namely gawk, cat,=
 and copy (in our case MS Windows cmd.exe command). In order to run one of =
them it is necessary to erase the respective rem.
Each job creates a logfile "chkParallelError_1.log", "chkParallelError_2.lo=
g", etc. in the local directory, where the output (stderr and stdout) is di=
rected to, which can be parsed for "Bad". Additionally the output is partly=
 shown in the shell windows. In my environment I experienced roughly 1 "Bad=
 file descriptor" error in 5secs - 10minutes; eventually a server should be=
 used that has some work load.

Remark 1: Operating a similar test case with a gawk script instead of inlin=
e source I experienced from time to time "Bad File Descriptor" errors even =
when accessing the gawk script source itself, if that script was stored at =
the network share as well. With the gawk script stored locally, that error =
did not occur during 24 hrs testing time.

Remark 2: Attached cygcheck_150924.out was edited: Deleted several shell sy=
mbols, computer names, network shares, etc.

Remark 3: Since screen output is given for each call to gawk, it may be hel=
pful to minimize the shell windows that popped up (parallel processes) in o=
rder to speed up the process so that the errors become more frequent.

Remark 4: For the time being we have a workaround, "copy"-ing the setup fil=
es to a local SSD in separate directories for each parallel process before =
access by any Cygwin tool which is not convenient but at least works.


=3D=3D=3D datafile.txt: =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
This is line 1
This is line 2
This is line 3
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D chkParallelError.bat =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D
@setlocal
@echo off
=A0=A0=A0 set lis=3D%1
=A0=A0=A0 set njobs=3D%2
=A0=A0=A0 if "%lis%"=A0=A0 =3D=3D "" set lis=3Ddatafile.txt
=A0=A0=A0 if "%njobs%" =3D=3D "" set njobs=3D%NUMBER_OF_PROCESSORS%
=A0=A0=A0 if "%njobs%" =3D=3D "" set njobs=3D4
=A0=A0=A0 for /L %%I in (1,1,%njobs%) do echo start chkParallelErrorJob %%I=
 %lis%&start chkParallelErrorJob %%I %lis%
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D chkParallelErrorJob.bat =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D
@setlocal
@echo off
=A0=A0=A0 set instance=3D%1
=A0=A0=A0 set lis=3D%~dpnx2
=A0=A0=A0 echo instance=3D%instance% lis=3D%lis%
=A0=A0=A0 set n=3D0
rem Loop endlessly calling a gawk script that simply counts the lines
rem Write stdout and stderr to a logfile
rem After each call, write timestamp and number of call to logfile and stdo=
ut.
:loop
=A0=A0=A0 set/a n=3Dn+1
rem !!! Clear one of the following rems in order to activate that particula=
r command !!!
rem=A0=A0=A0=A0 gawk 'BEGINFILE{if(ERRNO)print "Trapped error",ERRNO,"openi=
ng file";}{n++}END{print "%date% %time% call %n%",n,"entries read"}' %lis%=
=A0=A0 >> chkParallelError_%instance%.log 2>&1
rem=A0=A0=A0=A0 cat=A0 %lis% > %lis%_%instance%=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0 2>> chkParallelError_%instance%.log
rem=A0=A0=A0=A0 copy %lis%=A0=A0 %lis%_%instance%=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 >> chkParallelError_%instance%.log 2>&1
rem In case of error write a note and the (last line of the) error message
=A0=A0=A0 if %errorlevel% neq 0 echo Error: %errorlevel%&tail -1 chkParalle=
lError_%instance%.log
rem Write timestamp and count mark to logfile and screen
=A0=A0=A0 echo %date% %time% Instance %instance% Call %n% >> chkParallelErr=
or_%instance%.log 2>&1
=A0=A0=A0 echo %date% %time% Instance %instance% Call %n% copy
=A0=A0=A0 goto loop
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Kind regards,
Wolfgang


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