Preferred style, there will be cleared comment in v6. Thanks, Ethan On Sat, Sep 26, 2020 at 12:42 AM Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> wrote: > > On Thu, Sep 24, 2020 at 10:34:21PM -0400, Ethan Zhao wrote: > > During DPC error injection test we found there is race condition between > > pciehp and DPC driver, null pointer reference caused panic as following > > null -> NULL > > > > > # setpci -s 64:02.0 0x196.w=000a > > // 64:02.0 is rootport has DPC capability > > # setpci -s 65:00.0 0x04.w=0544 > > // 65:00.0 is NVMe SSD populated in above port > > # mount /dev/nvme0n1p1 nvme > > > > (tested on stable 5.8 & ICX platform) > > > > Buffer I/O error on dev nvme0n1p1, logical block 468843328, > > async page read > > BUG: kernel NULL pointer dereference, address: 0000000000000050 > > #PF: supervisor read access in kernel mode > > #PF: error_code(0x0000) - not-present page > > Same comment about Oops. > > -- > With Best Regards, > Andy Shevchenko > >
