Re: NFS: Unable to handle kernel NULL pointer dereference at nfs_set_page_dirty+0xd/0x5d in 2.6.21rc7-git6

From: Andi Kleen
Date: Tue Apr 24 2007 - 14:19:34 EST

> Does this patch fix it?

Didn't hit that particular oops with that anymore in several LTP runs and
your patch applied, but got this data corruption:

doio(rwtest04) (20172) 19:01:03
check_file(/tmp/ltp-14369/mm-sync-20156, 12754624, 23879, R:20172:bigfoot:doio*,
21, 0) failed

Comparison fd is 5, with open flags 0
Corrupt regions follow - unprintable chars are represented as '.'
corrupt bytes starting at file offset 12754624
1st 32 expected bytes: R:20172:bigfoot:doio*R:20172:big
1st 32 actual bytes: ................................

Request number 622
fd 4 is file /tmp/ltp-14369/mm-sync-20156 - open flags are 010002 O_RD
write done at file offset 12754624 - pattern is R (0122)
number of requests is 1, strides per request is 1
i/o byte count = 23879
memory alignment is unaligned

syscall: mmap-write(NULL, 12800000, PROT_WRITE, MAP_SHARED, 4, 0)
file is mmaped to: 0x2b982c7ca000
file-mem=0x2b982d3f3ec0, length=23879, buffer=0x52d543

doio(rwtest04) (20169) 19:01:03
(parent) pid 20172 exited because of data compare errors

To reproduce: run of LTP over NFS a few times


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