Hello, On Tue, 29 Sep 2015, Andre Tomt wrote: > On 29. sep. 2015 10:39, Andre Tomt (LKML) wrote: > > I just had another hang with it reverted on two different guests.. > > However it took nearly 6 hours rather than the usual "few minutes" for > > these two. So now I'm a little unsure about my initial conclusions. > > > > On 29. sep. 2015 09:40, Julian Anastasov wrote: > >> On Tue, 29 Sep 2015, Andre Tomt (LKML) wrote: > <snip> > >> They are 2 related patches, the first one is > >> [PATCH 4.1 124/159] net: do not process device backlog during unregistration > > > > Would reverting this change anything outside device unregistration at all? Its role is only during unregistration, so it should not matter. > I enabled CONFIG_RCU_CPU_STALL_INFO=y and disabled a bunch of non-virt > drivers to speed up debugging. But no output this time either. Got any > ideas on debugging options I've forgot? Useful sysrqs? Checking my .config for debugs... I'm not expert on this but may be such settings can help: CONFIG_PROVE_RCU=y CONFIG_PROVE_RCU_REPEATEDLY=y CONFIG_SPARSE_RCU_POINTER=y CONFIG_DEBUG_SPINLOCK=y CONFIG_DEBUG_MUTEXES=y CONFIG_DEBUG_LOCK_ALLOC=y CONFIG_PROVE_LOCKING=y CONFIG_LOCKDEP=y CONFIG_DEBUG_ATOMIC_SLEEP=y CONFIG_TRACE_IRQFLAGS=y CONFIG_STACKTRACE=y - you have this one CONFIG_DEBUG_BUGVERBOSE=y Regards -- Julian Anastasov <ja@xxxxxx> -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html