Date: Thu, 03 Jun 1999 13:35:19 -0400 From: "David E. Cross" <crossd@cs.rpi.edu> To: freebsd-hackers@freebsd.org Cc: schimken@cs.rpi.edu, crossd@cs.rpi.edu Subject: 3.2-stable, panic #12 Message-ID: <199906031735.NAA37037@cs.rpi.edu>
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Our home directory NFS server went down again today, "same bat-panic".
This time it went down on ".Maillock" (usually it goes down on a netscape
cache file or .Xauthorit-c. Piecing some more together I modified my old
"crash_patoot.c" file (which didn't cause any problems), to the new and
improved version that does.
This is our environment:
FreeBSD NFS server running 3.2-STABLE from 1.5 to 2 weeks ago. Multiple
client machines of multiple architectures (Solaris 2.6, Irix 6.5.2+, FreeBSB
3.2+). These crashes were all reproduced with a Solaris client, I do not know
if it is reproduceable with other clients. Below is the short code segment
that will cause the crash, the additions I added to it to cause the crash
were rename(2) and unlink(2), without those I could not get a crash.
Also, available upon request is a packet dump of all traffic to/from that
machine leading to the crash (it is only 198336 bytes long, it was
captured with '-s 1500' with tcpdump).
Without further ado crash_patoot.c:
int main(int argc, char **argv)
{
int fd;
int counter;
char newfilename[1024];
strcpy(newfilename,argv[1]);
strcat(newfilename,".old");
for(counter=0;counter<1000000;counter++) {
fd=open(argv[1], O_CREAT, 600);
write(fd, &counter,4);
rename(argv[1], newfilename);
close(fd);
rename(newfilename, argv[1]);
fd=open(newfilename, O_CREAT,600);
unlink(newfilename);
close(fd);
fd=open(newfilename, O_CREAT,600);
close(fd);
unlink(newfilename);
}
return 0;
}
If you are able to reproduce this panic please let me know. I want to be
assured I am not going out of my mind. I am attempting to dig through the NFS
code to try to find the bug myself, but it is a daunting task.
--
David Cross | email: crossd@cs.rpi.edu
Systems Administrator/Research Programmer | Web: http://www.cs.rpi.edu/~crossd
Rensselaer Polytechnic Institute, | Ph: 518.276.2860
Department of Computer Science | Fax: 518.276.4033
I speak only for myself. | WinNT:Linux::Linux:FreeBSD
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