[Bug 266054] panic: page fault in sys/ofed/drivers/infiniband/core/ib_cma.c:1060
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Date: Fri, 26 Aug 2022 21:46:31 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266054
Eric Joyner <erj@freebsd.org> changed:
What |Removed |Added
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CC| |erj@freebsd.org
--- Comment #3 from Eric Joyner <erj@freebsd.org> ---
I think I can help; I discovered this already: (we had a little Twitter thread)
https://twitter.com/kaevans91/status/1557167097813278722
The tl;dr is that the V_in_loopback_mask variable (that gets accessed from
within cma_loopback_addr via the ipv4 loopback check) got added in a previous
commit but that RDMA code doesn't have the currvnet set, so the vnet that gets
checked in V_in_loopback_mask is NULL and the kernel panics.
IPv6 code in RDMA doesn't seem to use anything VIMAGE-related so that isn't
affected by this issue; you can IPv6 ping as a workaround for now. But krping
is IPv4 only, so that's currently unusable.
I think there are other IPv4 places in OFED that also need fixing, like
validate_ipv4_net_dev(). I tried looking around, but never got around to
properly finishing a patch that I was working on.
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