9c707525cb
When draining an NBD export, nbd_drained_begin() first sets
client->quiescing so that nbd_client_receive_next_request() won't start
any new request coroutines. Then nbd_drained_poll() tries to makes sure
that we wait for any existing request coroutines by checking that
client->nb_requests has become 0.
However, there is a small window between creating a new request
coroutine and increasing client->nb_requests. If a coroutine is in this
state, it won't be waited for and drain returns too early.
In the context of switching to a different AioContext, this means that
blk_aio_attached() will see client->recv_coroutine != NULL and fail its
assertion.
Fix this by increasing client->nb_requests immediately when starting the
coroutine. Doing this after the checks if we should create a new
coroutine is okay because client->lock is held.
Cc: qemu-stable@nongnu.org
Fixes:
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|---|---|---|
| .. | ||
| client-connection.c | ||
| client.c | ||
| common.c | ||
| meson.build | ||
| nbd-internal.h | ||
| server.c | ||
| trace-events | ||
| trace.h | ||