From: Matt Mullins <mmull...@fb.com> Date: Thu, 17 May 2018 20:28:46 +0000
> On Thu, 2018-05-17 at 14:50 -0400, David Miller wrote: >> I'm surprised this problem wasn't discovered sooner. How exactly did you >> discover it? Did you actually see it trigger or is this purely from code >> inspection? > > Honestly, I'm not sure how it got uncovered, but it was observed at > runtime. Doron Roberts-Kedes hit a null pointer dereference so we > turned on CONFIG_DEBUG_SG -- then it became a proper > BUG_ON(!virt_addr_valid(buf)); in sg_set_buf. Fair enough, thanks for the info.
