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| author | Eric Sandeen <sandeen@redhat.com> | 2010-10-27 21:30:07 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2010-10-27 21:30:07 -0400 |
| commit | 4d5476164a052e80d4ef430e368e76dbde96801f (patch) | |
| tree | c4949f899392c99896e3e81250c5f667a5ae0ba3 /include | |
| parent | 0c9169ccad4aed233fdd49e95da4eada2536a06d (diff) | |
| download | lwn-4d5476164a052e80d4ef430e368e76dbde96801f.tar.gz lwn-4d5476164a052e80d4ef430e368e76dbde96801f.zip | |
ext4: fix oops in trace_ext4_mb_release_group_pa
Our QA reported an oops in the ext4_mb_release_group_pa tracing,
and Josef Bacik pointed out that it was because we may have a
non-null but uninitialized ac_inode in the allocation context.
I can reproduce it when running xfstests with ext4 tracepoints on,
on a CONFIG_SLAB_DEBUG kernel.
We call trace_ext4_mb_release_group_pa from 2 places,
ext4_mb_discard_group_preallocations and
ext4_mb_discard_lg_preallocations
In both cases we allocate an ac as a container just for tracing (!)
and never fill in the ac_inode. There's no reason to be assigning,
testing, or printing it as far as I can see, so just remove it from
the tracepoint.
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Josef Bacik <josef@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'include')
| -rw-r--r-- | include/trace/events/ext4.h | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h index 6a1fcff95f7c..fbdfa3a6bbd8 100644 --- a/include/trace/events/ext4.h +++ b/include/trace/events/ext4.h @@ -432,7 +432,6 @@ TRACE_EVENT(ext4_mb_release_group_pa, TP_STRUCT__entry( __field( dev_t, dev ) - __field( ino_t, ino ) __field( __u64, pa_pstart ) __field( __u32, pa_len ) @@ -440,8 +439,6 @@ TRACE_EVENT(ext4_mb_release_group_pa, TP_fast_assign( __entry->dev = sb->s_dev; - __entry->ino = (ac && ac->ac_inode) ? - ac->ac_inode->i_ino : 0; __entry->pa_pstart = pa->pa_pstart; __entry->pa_len = pa->pa_len; ), |