When I/O request parameters are validated for virtio-blk exports like vhost-user-blk and vduse-blk, we call blk_get_geometry() from a coroutine. This hits an assume_graph_lock() assertion failure.
Use blk_co_nb_sectors() instead and mark virtio_blk_sect_range_ok() with coroutine_fn. This assertion failure is triggered by any I/O to a vhost-user-blk export. Fixes: 8ab8140a04cf ("block: Mark bdrv_co_refresh_total_sectors() and callers GRAPH_RDLOCK") Cc: Kevin Wolf <kw...@redhat.com> Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com> --- block/export/virtio-blk-handler.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/block/export/virtio-blk-handler.c b/block/export/virtio-blk-handler.c index 313666e8ab..2f729a9ce2 100644 --- a/block/export/virtio-blk-handler.c +++ b/block/export/virtio-blk-handler.c @@ -22,8 +22,9 @@ struct virtio_blk_inhdr { unsigned char status; }; -static bool virtio_blk_sect_range_ok(BlockBackend *blk, uint32_t block_size, - uint64_t sector, size_t size) +static bool coroutine_fn +virtio_blk_sect_range_ok(BlockBackend *blk, uint32_t block_size, + uint64_t sector, size_t size) { uint64_t nb_sectors; uint64_t total_sectors; @@ -41,7 +42,7 @@ static bool virtio_blk_sect_range_ok(BlockBackend *blk, uint32_t block_size, if ((sector << VIRTIO_BLK_SECTOR_BITS) % block_size) { return false; } - blk_get_geometry(blk, &total_sectors); + total_sectors = blk_co_nb_sectors(blk); if (sector > total_sectors || nb_sectors > total_sectors - sector) { return false; } -- 2.39.2