On Thu, Feb 20, 2020 at 08:57:29AM -0500, Chuck Lever wrote: > Hello! > > Thanks for your bug report. > > > > On Feb 19, 2020, at 10:22 PM, Wang Yugui <wangyugui@xxxxxxxxxxxx> wrote: > > > > Hi, chuck.lever > > > > a bug(BUG: kernel NULL pointer dereference) of ib or mlx happened in 5.4.21 but not in 5.4.20. > > > > maybe some releationship to xprtrdma-fix-dma-scatter-gather-list-mapping-imbalance.patch > > I don't see an obvious connection to fix-dma-scatter-gather-list-mapping-imbalance. > The backtrace below is through IPoIB code paths. Those have nothing to do with > NFS/RDMA, which is the only ULP code that is changed by my commit. > > > > maybe the info is useful. > > I'm copying linux-rdma for a bigger set of eyeballs. > > My knee-jerk recommendation is that if you have a reliable reproducer, try "git bisect" > between .20 and .21 to nail down a specific commit where the BUG starts to occur. No need to bisect, it is me who broke. The fix is already accepted, but not yet merged. https://patchwork.kernel.org/patch/11387567/ Thanks
