On Thu, Jan 30, 2020 at 03:44:50PM +0100, Vlastimil Babka wrote: > On 1/29/20 7:08 PM, Grzegorz Halat wrote: > > Memory management subsystem performs various checks at runtime, > > if an inconsistency is detected then such event is being logged and kernel > > continues to run. While debugging such problems it is helpful to collect > > memory dump as early as possible. Currently, there is no easy way to panic > > kernel when such error is detected. > > > > It was proposed[1] to panic the kernel if panic_on_oops is set but this > > approach was not accepted. One of alternative proposals was introduction of > > a new sysctl. > > > > Add a new sysctl - panic_on_inconsistent_mm. If the sysctl is set then the > > kernel will be crashed when an inconsistency is detected by memory > > management. This currently means panic when bad page or bad PTE > > is detected(this may be extended to other places in MM). > > I wonder, should enabling the sysctl also effectively convert VM_WARN... > to VM_BUG... ? There is already panic_on_warn sysctl... wouldn't that be sufficient? -- Kees Cook
