Messages in this thread | | | Date | Sat, 11 Nov 2017 12:18:30 +0900 (KST) | Subject | Re: [PATCH 0/2][v5] Add the ability to do BPF directed error injection | From | David Miller <> |
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From: Josef Bacik <josef@toxicpanda.com> Date: Tue, 7 Nov 2017 15:28:41 -0500
> I'm sending this through Dave since it'll conflict with other BPF changes in his > tree, but since it touches tracing as well Dave would like a review from > somebody on the tracing side. ... > A lot of our error paths are not well tested because we have no good way of > injecting errors generically. Some subystems (block, memory) have ways to > inject errors, but they are random so it's hard to get reproduceable results. > > With BPF we can add determinism to our error injection. We can use kprobes and > other things to verify we are injecting errors at the exact case we are trying > to test. This patch gives us the tool to actual do the error injection part. > It is very simple, we just set the return value of the pt_regs we're given to > whatever we provide, and then override the PC with a dummy function that simply > returns. > > Right now this only works on x86, but it would be simple enough to expand to > other architectures. Thanks,
Series applied, thanks Josef.
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