problems with nfs+TCP - Resource temporarily unavailable

[Oliver Lehmann]

Hi Mohan,

Mohan Srinivasan wrote:


> Is this consistently reproducible ?

it is - everytime


> I tried reproducing this with this morning's
> current,

it also happens with STABLE


> How big was your file that you tried to dd ? I need to reproduce this here
> in order to track it down.

dd if=/dev/urandom of=/usr/tmp.data bs=512k count=200


> Also, can you try the test without using the soft mount option ? I don't see 
> soft causing this, but just to eliminate those code paths.

I removed soft and bb, but still the same results:

root at kartoffel olivleh1> dd if=/usr/tmp.data of=/mnt/files/temp bs=32k
dd: /mnt/files/temp: Resource temporarily unavailable
1797+0 records in
1796+0 records out
58851328 bytes transferred in 33.651500 secs (1748847 bytes/sec)


######


I tried the same with an other nfs server (using dill as nfs server this
time - system description is in my 1st mail, same mount options like /
mnt/files). And guess what? dill rebooted immediate... dd came never
back, gave no output

dill's dmesg shows me:

fatal kernel trap:

    trap entry     = 0x4 (unaligned access fault)
    faulting va    = 0xfffffc0006b6f44d
    opcode         = 0x28
    register       = 0x5
    pc             = 0xfffffc0000541e08
    ra             = 0xfffffc0000541df4
    sp             = 0xfffffe000a0f9b70
    usp            = 0x11ffea80
    curthread      = 0xfffffc000f91ee10
        pid = 343, comm = nfsd

panic: trap
Uptime: 3d14h15m51s
Dumping 253 MB
 16 32 48 64 80 96 112 128 144 160 176 192 208 224 240
Dump complete

unfortunately...

root at dill tmp> kgdb vmcore.1 /usr/obj/alpha-5.4/usr/src/sys/DILL/
kernel.debug kgdb: bad namelist
Exit 1

and.... damn! yes that panic is reproduceable!

2nd try writing on dill:

root at kartoffel olivleh1> dd if=/usr/tmp.data of=/mnt/www/temp bs=32k
dd: /mnt/www/temp: Resource temporarily unavailable
387+0 records in
386+0 records out
12648448 bytes transferred in 11.766768 secs (1074930 bytes/sec)
<dill is gone - dd exited when dill was up again (NFS..)>

So.. using i386 as an tcp nfs-server - the only thing which happens is
that dd gets interruped, using alpha as an tcp nfs-server makes the alpha
panic.


And now it looks I should at first unmount the tcp mount, and then let my
alpha system come back online ;) (which is of course not possible w/o the
nfsd available of course....)


May 26 00:59:44 dill rpcbind: cannot create socket for udp6
Starting mountd.
NFS on reserved port only=YES
Starting nfsd.
Starting local daemons:
fatal kernel trap:

    trap entry     = 0x4 (unaligned access fault)
    faulting va    = 0xfffffc000f908929
    opcode         = 0x28
    register       = 0x5
    pc             = 0xfffffc0000532164
    ra             = 0xfffffc0000532138
    sp             = 0xfffffe000a1118c0
    usp            = 0x11ffea80
    curthread      = 0xfffffc000f91f950
        pid = 409, comm = nfsd

panic: trap
Uptime: 8m17s
Dumping 253 MB
 16 32 48 64 80 96 112 128 144 160 176 192 208 224 240
Dump complete
Automatic reboot in 15 seconds - press a key on the console to abort
Rebooting...
*** keyboard not plugged in...

halted CPU 0

halt code = 5
HALT instruction executed
PC = fffffc00005bfac0
*** no timer interrupts on CPU 0 ***

CPU 0 booting



If someone want me to test sth.. let me know Systems available are 6.0/
i386, 6.0/amd64, 5.4-SMP/i386, 5.4/i386, 5.4/alpha, 4.11/i386


-- 
 Oliver Lehmann
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