Date: Wed, 11 Aug 1999 20:50:54 +0200 (CEST) From: A.Leidinger@WJPServer.CS.Uni-SB.de To: freebsd-current@freebsd.org Subject: Crash with NFS V2 Message-ID: <199908111850.UAA00795@work.net.local>
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Hi,
I have a program which does something like userland-nfs (nfs v2 client).
It is able to crash the machine. After compiling a debug kernel the
only output I get after the crashdump is:
---snip---
(100) root@ttyp3 # gdb -kernel -se /sys/compile/WORK/kernel.debug -c /var/crash/vmcore.1
IdlePTD 3743744
initial pcb at 2cb960
panic messages:
---
dmesg: kvm_read: invalid address (c02bcb50)
---
#0 boot (howto=Cannot access memory at address 0xc62e6b54.
) at ../../kern/kern_shutdown.c:291
291 dumppcb.pcb_cr3 = rcr3();
(kgdb) bt
#0 boot (howto=Cannot access memory at address 0xc62e6b54.
) at ../../kern/kern_shutdown.c:291
Cannot access memory at address 0xc62e6b4c.
---snip---
- System is -current from august 5th.
- "mountd -2 -n"
- "nfsd -u"
My program does a nfs read call and wants a buffer
(readres.readres_u.reply.data.data_val) of 32k to be filled.
-> crashed from userland
(the program and the nfs server are running on the same machine)
The core and the debug kernel are available, feel free to give me some
advice how to get more information out of it.
-----
There is also a strange behavior in nfs_readdir:
I get a segfault with readdir (in libc, something xdr relatet if I
remember correctly) if the buffer
(readdirres.readdirres_u.reply.entries) is less than 8k+1
[NFS_MAXDATA+1] (on Solaris 2.4 this buffer has to be 257
[NFS_MAXNAMLEN+1] or greater).
This one is testet with:
- NFS-Server: FreeBSD 3.x, Userland-NFS-Client: Solaris 2.4
- NFS-Server + Userland-NFS-Client (on the same machine): FreeBSD
4-current (some months ago)
Bye,
Alexander.
--
Can I trade this job for what's behind door #2?
http://netchild.home.pages.de A.Leidinger+Home @ WJPServer.CS.Uni-SB.de
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