Re: [PATCH RFC] fs: xfs: Fix xfs_trans_read_buf event tracing

Pratyush Anand
2015-02-19T17:25:55Z

On Thursday 19 February 2015 10:50 PM, Brian Foster wrote:
> On Thu, Feb 19, 2015 at 06:54:33PM +0530, Pratyush Anand wrote:
>> My root file system is xfs. As soon as I enable event for
>> xfs_trans_read_buf `echo xfs:xfs_trans_read_buf >>
>> /sys/kernel/debug/tracing/set_event`, I see a kernel panic.
>>
>> A little bit of debugging shows that bp->b_fspriv is NULL many a time
>> when trace_xfs_trans_read_buf(bp->b_fspriv) is called.
>>
>> I do not have any idea about xfs filesystem. So, I am not sure, if it
>> is expected to have bp->b_fspriv = NULL at this location.
>>
>> This patch fixes the issue, until we have a better fix.
>>
>> Signed-off-by: Pratyush Anand <panand@redhat.com>
>> ---
>
> A fix for this has been posted here:
>
> http://oss.sgi.com/archives/xfs/2015-02/msg00101.html
>

Thanks Brian

~Pratyush