On Fri, Jan 19, 2018 at 8:29 PM, Shankara Pailoor <sp3...@columbia.edu> wrote: > Hi Dmitry, > > I added support for kcov in strace and I have been tracing a fairly > large program but after a little while, I notice that when I mmap a > new cover buffer, the call fails with ENOMEM. After killing the > program, I try and rerun and I notice that there is nearly no memory > on the system. When I do a kmemleak scan I get the following reports: > > I believe the problem occurs when I try and setup the kcov buffer > again after an exec. Instead of reusing the old file descriptor I open > kcov again within that process. In that case, I don't know what > happens to the old kcov struct. > > I don't see a maintainers list for kcov so I decided to email you > directly. Let me know what more information I can provide.
Hi Shankara, Looks bad. Can you provide a reproducer? We extensively use kcov with syzkaller, but have not observed such leaks. Also I don't see anything obvious in the code. Thanks
