Messages in this thread | | | Date | Mon, 31 Mar 2014 18:32:40 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: perf_fuzzer: BUG in kfree() in ftrace_graph_exit_task |
| |
On Mon, 31 Mar 2014, Vince Weaver wrote: > > This turned up with the perf_fuzzer, haswell, 3.14. > > I'm not sure if this is related to the other object corruption bug I am > seeing. The sympstoms are similar (BUG when dereferencing low invalid > kernel address) but this time the hrtimer code is not involved at all. > > This isn't reproducible, that is if I re-run the fuzzer with the same > random seed after reboot the bug doesn't trigger. > > > [ 5498.573458] BUG: unable to handle kernel NULL pointer dereference at 000000000000006c > [ 5498.585181] IP: [<ffffffff81189111>] kfree+0x91/0x220 > [ 5498.593887] PGD 0 > [ 5498.599365] Oops: 0000 [#1] SMP > [ 5498.606127] Dumping ftrace buffer: > [ 5498.612973] (ftrace buffer empty) > [ 5498.619868] Modules linked in: nfsd auth_rpcgss ..... > [ 5498.720303] CPU: 1 PID: 13 Comm: ksoftirqd/1 Tainted: G W 3.14.0+ #14
It's already tainted with W, so there was a warning before that crash. It would be interesting to see that as well.
Thanks,
tglx
| |