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Re: BUG: NULL pointer dereference at ib_uverbs_comp_handler+0x20

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Hey,

The patch Bharat provided fixes the kernel panic but RDMA in userspace
still does not work at all. Reverting the commits I mentioned still
fixes everything.

To answer your questions:

* I see the iwpm_register_pid message even when things are working so I
don't think it's related.

* All clients I've tried fail. I've attached a log of all the error
messages I see with various clients. (This was with Bharat's patch so
there was no kernel panic and I saw no dmesgs during these runs). The
same runs with the commits I mentioned reverted work fine.

* I retested everything with the CX4 cards as well and they have a
similar problem but produce different error messages. I've attached a
log of client runs as well. The CX4 also works once I revert those
patches. However, by memory, I don't think the CX4s ever suffered from
the kernel panic, and I guess it was just luck that the patches I
reverted caused all these problems.


On 01/08/17 05:08 AM, Matan Barak wrote:
> PS, e0fcc61113c isn't a bug fix, it's just a simple refactor.

If it's not a bug fix I don't think it should have a fixes tag. It
probably didn't mater in this case but you don't want refactor commits
to accidentally reach a stable kernel.

Thanks,

Logan

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Re: BUG: NULL pointer dereference at ib_uverbs_comp_handler+0x20 Matan Barak <matanb@dev.mellanox.co.il> - 2017-08-01 13:10 +0200
  Re: BUG: NULL pointer dereference at ib_uverbs_comp_handler+0x20 Potnuri Bharat Teja <bharat@chelsio.com> - 2017-08-01 14:40 +0200
    Re: BUG: NULL pointer dereference at ib_uverbs_comp_handler+0x20 Logan Gunthorpe <logang@deltatee.com> - 2017-08-01 20:40 +0200
  Re: BUG: NULL pointer dereference at ib_uverbs_comp_handler+0x20 Logan Gunthorpe <logang@deltatee.com> - 2017-08-01 20:40 +0200
    Re: BUG: NULL pointer dereference at ib_uverbs_comp_handler+0x20 Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-08-01 21:30 +0200
      Re: BUG: NULL pointer dereference at ib_uverbs_comp_handler+0x20 Logan Gunthorpe <logang@deltatee.com> - 2017-08-01 21:50 +0200

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