On Fri, Feb 26, 2021 at 12:08 PM Chris Hyser <[email protected]> wrote: > > Update: > > The clone syscall stress test I have is causing a deadlock with this patchset > when > compiled with CONFIG_PROVE_RAW_LOCK_NESTING=y. I am able to get stacktraces > with > nmi_watchdog and am looking through those. Josh was not able to duplicate the > deadlock, instead getting an actual warning about kmalloc w/GFP_ATOMIC while > under a raw spinlock in the function __sched_core_update_cookie(). When I > retry > the test with a patch Josh sent, removing the kmalloc() and thus the trigger > of > the warning, no more deadlock. So some combination of CONFIGs, timing and > function calls seems to have found something in this LOCK proving code. > > -chrish
I have a patch to remove the dynamic allocation and overall simplify the logic here. Will squash that along with the rest of the modifications suggested by Peter in the next version.
