On Fri, 2019-03-15 at 16:57 +-0800, Jianchao Wang wrote: +AD4 +AFs-2+AF0 https://marc.info/?l+AD0-linux-block+ACY-m+AD0-154526189023236+ACY-w+AD0-2 Hi Jianchao, That is a reference to the +ACI-BUG: KASAN: use-after-free in bt+AF8-iter+ACI issue. I think that issue can be fixed in another way than modifying all code that iterates over tags, namely by adding an rcu+AF8-read+AF8-lock() / rcu+AF8-read+AF8-unlock() pair in bt+AF8-for+AF8-each() and bt+AF8-tags+AF8-for+AF8-each() and by changing the calls in blk+AF8-mq+AF8-free+AF8-rqs() and blk+AF8-free+AF8-flush+AF8-queue() that free the data structures used by the tag iteration functions into kfree+AF8-rcu() or call+AF8-rcu() calls. Thanks, Bart.
