On Mon, Mar 6, 2017 at 1:13 PM, Peter Zijlstra <pet...@infradead.org> wrote: > On Mon, Mar 06, 2017 at 10:57:07AM +0100, Dmitry Vyukov wrote: >> Hello, >> >> I've got the following use-after-free report while running syzkaller >> fuzzer on 86292b33d4b79ee03e2f43ea0381ef85f077c760. Note that the task >> is freed right in copy_process due to some error, but it's referenced >> by another thread in perf subsystem. > > Weird... you don't happen to have a reproduction case available?
Unfortunately no. I've looked at both logs that I have and there are no memory allocation failures preceding the crash (however maybe somebody used NOWARN?). But probably if you inject an error into copy_process somewhere after perf_event_init_task, it should reproduce the bug with KASAN I think.