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Fix: ring buffer: handle concurrent update in nested buffer wrap around check
[lttng-modules.git]
/
lttng-events.c
diff --git
a/lttng-events.c
b/lttng-events.c
index faf3e1f0f8f76785ebcc8b9d0baa170f113817e9..27a8f8644477be0bcf41c3732622e0e8c0f9fa57 100644
(file)
--- a/
lttng-events.c
+++ b/
lttng-events.c
@@
-563,6
+563,8
@@
int lttng_metadata_output_channel(struct lttng_channel *chan,
len = stream->metadata_cache->metadata_written -
stream->metadata_cache_read;
+ if (!len)
+ return 0;
reserve_len = min_t(size_t,
chan->ops->packet_avail_size(chan->chan),
len);
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