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Subjectcrash below shrink_dcache_memory
Date
Hi!

We're having trouble here with our data acquisition systems when
recording some 10MB/s from a PCI card to a file on NFS, using write
()'s of about 8kB. I thought is was connected to running X at the
same time, but without X it also happened and I got part of a backtrace:

[scrolled off]
kdb
die
vprintk
do_page_fault
do_page_fault
iput
load_balance_newidle
schedule
do_page_fault
error_code
nfs_dentry_iput
iput
nfs_dentry_iput
prune_dcache
shrink_dcache_memory
shrink_slab
balance_pgdat
prepare_to_wait
kswapd
[...]

The system is Scientific Linux CERN 4.3, based on RHEL4, kernel
2.6.9-34.EL.cernsmp, running on a two-way Xeon. What I'd like to know
is whether a page fault can legally happen while shrinking the
dcache; this sounds a bit counterintuitive to me. If anyone has an
idea where to look for the cause of the crash, you're welcome.

Ciao,
Roland

--
TU Muenchen, Physik-Department E18, James-Franck-Str., 85748 Garching
Telefon 089/289-12575; Telefax 089/289-12570
--
CERN office: 892-1-D23 phone: +41 22 7676540 mobile: +41 76 487 4482
--
UNIX was not designed to stop you from doing stupid things, because that
would also stop you from doing clever things.
-Doug Gwyn
-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GS/CS/M/MU d-(++) s:+ a-> C+++ UL++++ P+++ L+++ E(+) W+ !N K- w--- M
+ !V Y+
PGP++ t+(++) 5 R+ tv-- b+ DI++ e+++>++++ h---- y+++
------END GEEK CODE BLOCK------




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