On 03/30/2017 05:28 AM, Dmitry Vyukov wrote: > On Wed, Mar 29, 2017 at 11:17 PM, Andrew Morton > <[email protected]> wrote: >> On Wed, 29 Mar 2017 14:08:02 -0700 Mike Kravetz <[email protected]> >> wrote: >> >>> >>> syzkaller fuzzer found this bug, that resulted in the following: >> >> I'll change the above to >> >> : syzkaller fuzzer (when using an injected kmalloc failure) found this bug, >> : that resulted in the following: >> >> it's important, because this bug won't be triggered (at all easily, at >> least) in real-world workloads. > > I wonder if memory-constrained cgroups make such bugs much easier to trigger. >
I think you might expose some bugs with memory-constrained cgroups. However, it is unlikely you could trigger this bug using that method. In this bug the injected kmalloc failure was for a 32 byte allocation. My guess is that it would be very very unlikely/lucky to have the allocations done by other routines on the stack succeed, and have this 32 byte allocation fail. -- Mike Kravetz
