Re: [PATCH] add check do_direct_IO() return val

Joe Jin wrote:

Well, I'm having a heck of a time getting this to fail. It looks possible, though. Joe, were you guys able to narrow it down to a reproducible test case? Do you have any oops output messages from the crashes?

Zach, it easy to reproduce through fio with following config file

# cat jobfile
[global]
bs=8k
iodepth=1024
iodepth_batch=60
randrepeat=1
size=1m
directory=/home/oracle
numjobs=20
[job1]
	ioengine=sync
	bs=1k
	direct=1
	rw=randread
	filename=file1:file2
[job2]
	ioengine=libaio
	rw=randwrite
	direct=1
	filename=file1:file2
[job3]
	bs=1k
	ioengine=posixaio
	rw=randwrite
	direct=1
	filename=file1:file2
[job4]
	ioengine=splice
	direct=1
	rw=randwrite
	filename=file1:file2
[job5]
	bs=1k
	ioengine=sync
	rw=randread
	filename=file1:file2
[job7]
	ioengine=libaio
	rw=randwrite
	filename=file1:file2
[job8]
	ioengine=posixaio
	rw=randwrite
	filename=file1:file2
[job9]
	ioengine=splice
	rw=randwrite
	filename=file1:file2
[job10]
	ioengine=mmap
	rw=randwrite
	bs=1k
	filename=file1:file2
[job11]
	ioengine=mmap
	rw=randwrite
	direct=1

filename=file1:file2

Hmm.. in this config file, whats causing DIO to panic ? Which test actually
passing faulty buffer ?

Thanks,
Badari
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