* Any given element of pname:pCommandBuffers mustnot: be already pending execution in pname:commandBuffer, or appear twice in pname:pCommandBuffers, unless it was created with the ename:VK_COMMAND_BUFFER_USAGE_SIMULTANEOUS_USE_BIT flag
* Any given element of pname:pCommandBuffers mustnot: be already pending execution in any other sname:VkCommandBuffer, unless it was created with the ename:VK_COMMAND_BUFFER_USAGE_SIMULTANEOUS_USE_BIT flag
* Any given element of pname:pCommandBuffers must: be in the executable state
* If fname:vkCmdExecuteCommands is being called within a render pass instance, that render pass instance must: have been begun with the pname:contents parameter of fname:vkCmdBeginRenderPass set to ename:VK_SUBPASS_CONTENTS_SECONDARY_COMMAND_BUFFERS
* If fname:vkCmdExecuteCommands is being called within a render pass instance, any given element of pname:pCommandBuffers must: have been recorded with the ename:VK_COMMAND_BUFFER_USAGE_RENDER_PASS_CONTINUE_BIT
* If fname:vkCmdExecuteCommands is being called within a render pass instance, any given element of pname:pCommandBuffers must: have been recorded with the pname:subpass member of the pname:inheritanceInfo structure set to the index of the subpass which the given command buffer will be executed in
* If fname:vkCmdExecuteCommands is being called within a render pass instance, any given element of pname:pCommandBuffers must: have been recorded with a render pass that is compatible with the current render pass - see <<renderpass-compatibility>>
* If fname:vkCmdExecuteCommands is being called within a render pass instance, and any given element of pname:pCommandBuffers was recorded with the pname:framebuffer member of the sname:VkCommandBufferInheritanceInfo structure not equal to sname:VK_NULL_HANDLE, that sname:VkFramebuffer must: be compatible with the sname:VkFramebuffer used in the current render pass instance
* If the <<features-features-inheritedQueries,inherited queries>> feature is not enabled, pname:commandBuffer mustnot: have any queries <<queries-operation-active,active>>
* If pname:commandBuffer has a ename:VK_QUERY_TYPE_OCCLUSION query <<queries-operation-active,active>>, then each element of pname:pCommandBuffers must: have been recorded with sname:VkCommandBufferBeginInfo::pname:occlusionQueryEnable set to ename:VK_TRUE
* If pname:commandBuffer has a ename:VK_QUERY_TYPE_OCCLUSION query <<queries-operation-active,active>>, then each element of pname:pCommandBuffers must: have been recorded with sname:VkCommandBufferBeginInfo::pname:queryFlags having all bits set that are set for the query
* If pname:commandBuffer has a ename:VK_QUERY_TYPE_PIPELINE_STATISTICS query <<queries-operation-active,active>>, then each element of pname:pCommandBuffers must: have been recorded with sname:VkCommandBufferBeginInfo::pname:pipelineStatistics having all bits set that are set in the sname:VkQueryPool the query uses
* Any given element of pname:pCommandBuffers mustnot: begin any query types that are <<queries-operation-active,active>> in pname:commandBuffer