On Mon, Aug 20, 2018 at 9:42 PM, Ravi Bangoria <ravi.bangoria@xxxxxxxxxxxxx> wrote: > Hi Song, > >> root@virt-test:~# ~/a.out >> 11 >> semaphore 0 >> semaphore 0 >> semaphore 2 <<< when the uprobe is enabled > > Yes, this happens when multiple vmas points to the same file portion. > Can you check /proc/`pgrep a.out`/maps. > > Logic is simple. If we are going to patch an instruction, increment the > reference counter. If we are going to unpatch an instruction, decrement > the reference counter. In this case, we patched instruction twice and > thus incremented reference counter twice as well. Yes, this makes sense. Song > > Ravi >
