add launchpad bug reports without comments

1 files changed, 42 insertions, 0 deletions

diff --git a/results/scraper/launchpad-without-comments/1362635 b/results/scraper/launchpad-without-comments/1362635
new file mode 100644
index 000000000..dcde3a9ab
--- /dev/null
+++ b/results/scraper/launchpad-without-comments/1362635
@@ -0,0 +1,42 @@
+bdrv_read co-routine re-entered recursively
+
+calling bdrv_read in a loop leads to the follwing situation:
+
+bs->drv->bdrv_aio_readv is called, and finally calls bdrv_co_io_em_complete in other thread context.
+there is a possibility of calling bdrv_co_io_em_complete before calling qemu_coroutine_yield in bdrv_co_io_em. And qemu fails with "co-routine re-entered recursively".
+
+static void bdrv_co_io_em_complete(void *opaque, int ret)
+{
+    CoroutineIOCompletion *co = opaque;
+
+    co->ret = ret;
+    qemu_coroutine_enter(co->coroutine, NULL);
+}
+
+static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num,
+                                      int nb_sectors, QEMUIOVector *iov,
+                                      bool is_write)
+{
+    CoroutineIOCompletion co = {
+        .coroutine = qemu_coroutine_self(),
+    };
+    BlockDriverAIOCB *acb;
+
+    if (is_write) {
+        acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors,
+                                       bdrv_co_io_em_complete, &co);
+    } else {
+        acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors,
+                                      bdrv_co_io_em_complete, &co);
+    }
+
+    trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb);
+    if (!acb) {
+        return -EIO;
+    }
+    qemu_coroutine_yield();
+
+    return co.ret;
+}
+
+is it a bug, or may be I don't understand something?
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