On Tue, Sep 26, 2023 at 3:57 AM Bob Pearson <rpearsonhpe@xxxxxxxxx> wrote: > > On 9/25/23 10:00, Bart Van Assche wrote: > > On 9/24/23 21:47, Daisuke Matsuda (Fujitsu) wrote: > >> As Bob wrote above, nobody has found any logical failure in rxe > >> driver. > > > > That's wrong. In case you would not yet have noticed my latest email in > > this thread, please take a look at > > https://lore.kernel.org/linux-rdma/e8b76fae-780a-470e-8ec4-c6b650793d10@xxxxxxxxxxxxx/T/#m0fd8ea8a4cbc27b37b042ae4f8e9b024f1871a73. I think the report in that email is a 100% proof that there is a use-after-free issue in the rdma_rxe driver. Use-after-free issues have security implications and also can cause data corruption. I propose to revert the commit that introduced the rdma_rxe use-after-rpearson:src$ git clone git://git.kernel.org/pub/scm/linux/git/rafael/linux-pm > Cloning into 'linux-pm'... > fatal: remote error: access denied or repository not exported: /pub/scm/linux/git/rafael/linux-pm > free unless someone comes up with a fix for the rdma_rxe driver. > > > > Bart. > > Bart, > > Having trouble following your recipe. The git repo you mention does not seem to be available. E.g. > > rpearson:src$ git clone git://git.kernel.org/pub/scm/linux/git/rafael/linux-pm > Cloning into 'linux-pm'... > fatal: remote error: access denied or repository not exported: /pub/scm/linux/git/rafael/linux-pm > > I am not sure how to obtain the tag if I cannot see the repo. > > If I just try to enable KASAN by setting CONFIG_KASAN=y in .config for the current linux-rdma repo > and compile the kernel the kernel won't boot and is caught in some kind of SRSO hell. If I checkout > Linus' v6.4 tag and add CONFIG_KASAN=y to a fresh .config file the kernel builds OK but when I > try to boot it, it is unable to chroot to the root file system in boot. Bob, Suggested by a friend who is an expert in process schedule and workqueue, I made a test as below. On each CPU, a cpu-intensive process runs with high priority. Then run rxe with the commit, the rping almost can not work well. Without this commit, rping can work with rxe in the same scenario. When you fix this problem, consider the above. > > Any hints would be appreciated. > > Bob >
