From: Kevin Wolf Date: Thu, 3 Dec 2020 18:23:11 +0100 Subject: block: Fix deadlock in bdrv_co_yield_to_drain() Git-commit 960d5fb3e8ee09bc5f1a5c84f66dce42a6cef920 If bdrv_co_yield_to_drain() is called for draining a block node that runs in a different AioContext, it keeps that AioContext locked while it yields and schedules a BH in the AioContext to do the actual drain. As long as executing the BH is the very next thing that the event loop of the node's AioContext does, this actually happens to work, but when it tries to execute something else that wants to take the AioContext lock, it will deadlock. (In the bug report, this other thing is a virtio-scsi device running virtio_scsi_data_plane_handle_cmd().) Instead, always drop the AioContext lock across the yield and reacquire it only when the coroutine is reentered. The BH needs to unconditionally take the lock for itself now. This fixes the 'block_resize' QMP command on a block node that runs in an iothread. Cc: qemu-stable@nongnu.org Fixes: eb94b81a94bce112e6b206df846c1551aaf6cab6 Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1903511 Signed-off-by: Kevin Wolf Message-Id: <20201203172311.68232-4-kwolf@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy Signed-off-by: Kevin Wolf Signed-off-by: Bruce Rogers --- block/io.c | 41 ++++++++++++++++++++++++----------------- 1 file changed, 24 insertions(+), 17 deletions(-) diff --git a/block/io.c b/block/io.c index ec5e152bb70f62371b608e95d514..a9f56a9ab1c56a3ca83833bfb0fa 100644 --- a/block/io.c +++ b/block/io.c @@ -306,17 +306,7 @@ static void bdrv_co_drain_bh_cb(void *opaque) if (bs) { AioContext *ctx = bdrv_get_aio_context(bs); - AioContext *co_ctx = qemu_coroutine_get_aio_context(co); - - /* - * When the coroutine yielded, the lock for its home context was - * released, so we need to re-acquire it here. If it explicitly - * acquired a different context, the lock is still held and we don't - * want to lock it a second time (or AIO_WAIT_WHILE() would hang). - */ - if (ctx == co_ctx) { - aio_context_acquire(ctx); - } + aio_context_acquire(ctx); bdrv_dec_in_flight(bs); if (data->begin) { assert(!data->drained_end_counter); @@ -328,9 +318,7 @@ static void bdrv_co_drain_bh_cb(void *opaque) data->ignore_bds_parents, data->drained_end_counter); } - if (ctx == co_ctx) { - aio_context_release(ctx); - } + aio_context_release(ctx); } else { assert(data->begin); bdrv_drain_all_begin(); @@ -348,13 +336,16 @@ static void coroutine_fn bdrv_co_yield_to_drain(BlockDriverState *bs, int *drained_end_counter) { BdrvCoDrainData data; + Coroutine *self = qemu_coroutine_self(); + AioContext *ctx = bdrv_get_aio_context(bs); + AioContext *co_ctx = qemu_coroutine_get_aio_context(self); /* Calling bdrv_drain() from a BH ensures the current coroutine yields and * other coroutines run if they were queued by aio_co_enter(). */ assert(qemu_in_coroutine()); data = (BdrvCoDrainData) { - .co = qemu_coroutine_self(), + .co = self, .bs = bs, .done = false, .begin = begin, @@ -368,13 +359,29 @@ static void coroutine_fn bdrv_co_yield_to_drain(BlockDriverState *bs, if (bs) { bdrv_inc_in_flight(bs); } - replay_bh_schedule_oneshot_event(bdrv_get_aio_context(bs), - bdrv_co_drain_bh_cb, &data); + + /* + * Temporarily drop the lock across yield or we would get deadlocks. + * bdrv_co_drain_bh_cb() reaquires the lock as needed. + * + * When we yield below, the lock for the current context will be + * released, so if this is actually the lock that protects bs, don't drop + * it a second time. + */ + if (ctx != co_ctx) { + aio_context_release(ctx); + } + replay_bh_schedule_oneshot_event(ctx, bdrv_co_drain_bh_cb, &data); qemu_coroutine_yield(); /* If we are resumed from some other event (such as an aio completion or a * timer callback), it is a bug in the caller that should be fixed. */ assert(data.done); + + /* Reaquire the AioContext of bs if we dropped it */ + if (ctx != co_ctx) { + aio_context_acquire(ctx); + } } void bdrv_do_drained_begin_quiesce(BlockDriverState *bs,