2.3.11: BUG() in filemap.c:1406 caused by nfs

Petr Vandrovec Ing. VTEI (VANDROVE@vc.cvut.cz)
Fri, 23 Jul 1999 15:35:40 MET-1

Hi,
today I have to change IP number of one of my diskless (it is diskless
since monday when IDE disk died...) and I changed boot commandline
from IP 147.32.240.3 to 147.32.240.80. Unfortunately, I forgot to change
this value in initscripts, so Debian init invoked ifconfig eth0 147.32.240.3.
After this, networking died and I got oops with
BUG() in filemap.c:1406 message :-(
Yes, that was pilot error, but I think that first error in nfs readpage()
can cause this. I have no clue what's wrong (as usual).

And one another question - I had to switch my (knfs) server from
2.3.11-pre5 to 2.2.11-alan-proposed-2, because of I was getting ext2
corruptions (it worked for at least week without started knfsd without
problems, same kernel after insmod knfsd+running client (writting 4MB of
data (with random seeks) once every 4 minutes) died while compiling new
kernel (I was going to compile pre6 at that time)):
ext2_readdir: bad entry in directory #86095: rec_len % 4 != 0 - offset=0, (*)
inode=3064714009, rec_len=50531, name_len=165
or
ext2_free_blocks: Freeing blocks not in datazonme - block = 774971392, count = 1
ext2_free_blocks: bit already cleared for block 3044457
or
files accessed while accessing server from client were damaged (filled
with 4KB chunks of zeroes).
Last one was probably caused by lazy_tlb bugs in pre5, for first two
I'm not sure. Because of I'm leaving Prague for one week today, I cannot
(I do not want...) test real 2.3.11 as server :-(
Best regards,
Petr Vandrovec
vandrove@vc.cvut.cz

(*) When this happened, /tftpboot/147.32.240.3/etc/terminfo directory
entry disappeared on server :-( Directory itself (with subdirectories) was
moved to lost+found by fsck. Client was doing read-only accesses to this
directory at that time (ncurses app startup); I do not think that it did
rw accesses at that time.

P.S.: /etc/exports:
#
#
/tftpboot/fs/bin 147.32.240.3(ro,insecure,no_root_squash) 147.32.240.80(ro,insecure,no_root_squash)
/tftpboot/fs/dev 147.32.240.3(ro,insecure,no_root_squash) 147.32.240.80(ro,insecure,no_root_squash)
/tftpboot/fs/sbin 147.32.240.3(ro,insecure,no_root_squash) 147.32.240.80(ro,insecure,no_root_squash)
/tftpboot/fs/usr 147.32.240.3(ro,insecure,no_root_squash) 147.32.240.80(ro,insecure,no_root_squash)
/tftpboot/fs/lib 147.32.240.3(ro,insecure,no_root_squash) 147.32.240.80(ro,insecure,no_root_squash)
/tftpboot/147.32.240.3 147.32.240.3(rw,insecure,no_root_squash)
/tftpboot/147.32.240.80 147.32.240.80(rw,insecure,no_root_squash)

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