i386/120872: fstat exit on signall 11

[Dmitry Andrianov]

The following reply was made to PR i386/120872; it has been noted by GNATS.

From: Dmitry Andrianov <666.root at gmail.com>
To: bug-followup at FreeBSD.org
Cc:  
Subject: Re: i386/120872: fstat exit on signall 11
Date: Wed, 20 Feb 2008 19:14:42 +0300

 Volker пишет:
 > On 02/20/08 16:33, Dmitry Andrianov wrote:
 >   
 >> Possibly, followings lines to you it will be helped something:
 >>
 >> root at zingel:~$ fstat -M test.c
 >> Segmentation fault: 11
 >> root at zingel:~$ ls -al test.c
 >> -rw-r--r--  1 root  wheel   142B Jan 30 14:13 test.c
 >> root at zingel:~$ perl -e "print 'A' x45" > test1.c
 >> root at zingel:~$ fstat -M test1.c
 >> Segmentation fault: 11
 >> root at zingel:~$ ls -la test1.c
 >> -rw-r--r--  1 root  wheel   142B Feb 20 17:53 test1.c
 >> root at zingel:~$ cat > test2.c
 >> AAABBBCCCC
 >> ^C
 >> root at zingel:~$ fstat -M test2.c
 >> fstat: cannot read IdlePTD
 >> root at zingel:~$ ls -la test2.c
 >> -rw-r--r--  1 root  wheel    11B Feb 20 17:55 test2.c
 >> root at zingel:~$
 >>     
 >
 > Dmitry,
 >
 > I still don't get the picutre. Can you try to explain what you are going
 > to try? The -M parameter requires a core dump file to be given. If
 > given, fstat tries to list you all opened files of a process at the time
 > the process was getting killed.
 >
 > I agree, it's not nice to have it failing with a segfault but while
 > looking at the code, I'm not quite sure if the error message can be
 > changed easily.
 >
 > fstat needs to check if the file given as -M (core) is really a core
 > dump file before it's getting processed. That's an extra sanity check
 > that would be needed to suppress that message and fail with a better
 > message earlier. I'll leave this to the developers if they'll implement
 > that extra check and if it's possible to check that at all.
 >
 > PS: Please followup to the PR
 >
 >   
 I bequeathed already, but while why does not see to result. I will be at 
 home will write once again, if a result will be the same.
 
 Thk.