Hi Jason,
Could you tell me which version of kernel & userspace library support the fork operation?
Below is the info on my server machine:
1) kernel: 4.15.0-29-generic
modinfo ib_uverbs rdma_cm ib_core | grep 'filename\|description\|author'
filename: /lib/modules/4.15.0-29-generic/kernel/drivers/infiniband/core/ib_uverbs.ko
description: InfiniBand userspace verbs access
author: Roland Dreier
filename: /lib/modules/4.15.0-29-generic/kernel/drivers/infiniband/core/rdma_cm.ko
description: Generic RDMA CM Agent
author: Sean Hefty
filename: /lib/modules/4.15.0-29-generic/kernel/drivers/infiniband/core/ib_core.ko
description: core kernel InfiniBand API
author: Roland Dreier
2) userspace:
librdmacm-dev:amd64 17.1-1ubuntu0.1 amd64 Development files for the librdmacm library
librdmacm1:amd64 17.1-1ubuntu0.1 amd64 Library for managing RDMA connections
rdma-core 17.1-1ubuntu0.1 amd64 RDMA core userspace infrastructure and documentation
rdmacm-utils 17.1-1ubuntu0.1 amd64 Examples for the librdmacm library
B.R.
Changcheng
On 13:02 Wed 24 Apr, Jason Gunthorpe wrote:
> On Wed, Apr 24, 2019 at 11:32:51PM +0800, Liu, Changcheng wrote:
> > Hi Jason,
> > I have said that ibv_query_device return non-zero, then the code
> > will call abort function.
> > Example:
> > if (ibv_query_device(ctxt, device_attr)) {
> > abort();
> > }
> > The demo program could reproduce the problem i.e.
> > ibv_query_device_device return non-zero.
> > https://github.com/iotcg/rdma_error/blob/master/x722_mcx4.cpp
>
> you are running and old kernel and user space that does not support
> fork()
>
> Jason
