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@xxxxxxxxxx> --- fs/xfs/xfs_trans_buf.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/xfs/xfs_trans_buf.c b/fs/xfs/xfs_trans_buf.c index 0a4d4ab6d9a9..0b67a20643bf 100644 --- a/fs/xfs/xfs_trans_buf.c +++ b/fs/xfs/xfs_trans_buf.c @@ -329,7 +329,8 @@ xfs_trans_read_buf_map( if (tp) _xfs_trans_bjoin(tp, bp, 1); - trace_xfs_trans_read_buf(bp->b_fspriv); + if (bp->b_fspriv) + trace_xfs_trans_read_buf(bp->b_fspriv); *bpp = bp; return 0; -- 2.1.0 _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
