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-rw-r--r--block/block-backend.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/block/block-backend.c b/block/block-backend.c
index ef512f7..f25f3ba 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -2372,6 +2372,7 @@ int coroutine_fn blk_co_truncate(BlockBackend *blk, int64_t offset, bool exact,
Error **errp)
{
IO_OR_GS_CODE();
+ GRAPH_RDLOCK_GUARD();
if (!blk_is_available(blk)) {
error_setg(errp, "No medium inserted");
return -ENOMEDIUM;