Re: RCU stall leading to deadlock warning

2020-12-16 Thread Paul E. McKenney
On Wed, Dec 16, 2020 at 09:54:42AM -0800, Paul E. McKenney wrote: > On Wed, Dec 16, 2020 at 05:29:39PM +, Qais Yousef wrote: > > Hi Paul > > > > We hit the below splat a couple of days ago in our testing. Sadly I can't > > reproduce it. And it was on android-mainline branch.. > > > > It's the

Re: RCU stall leading to deadlock warning

2020-12-16 Thread Paul E. McKenney
On Wed, Dec 16, 2020 at 05:29:39PM +, Qais Yousef wrote: > Hi Paul > > We hit the below splat a couple of days ago in our testing. Sadly I can't > reproduce it. And it was on android-mainline branch.. > > It's the deadlock message that bothers me. I can't see how we could have ended > there.

Re: RCU stall leading to deadlock warning

2020-12-16 Thread Qais Yousef
On 12/16/20 10:00, Paul E. McKenney wrote: > On Wed, Dec 16, 2020 at 09:54:42AM -0800, Paul E. McKenney wrote: > > On Wed, Dec 16, 2020 at 05:29:39PM +, Qais Yousef wrote: > > > Hi Paul > > > > > > We hit the below splat a couple of days ago in our testing. Sadly I can't > > > reproduce it. An

RCU stall leading to deadlock warning

2020-12-16 Thread Qais Yousef
Hi Paul We hit the below splat a couple of days ago in our testing. Sadly I can't reproduce it. And it was on android-mainline branch.. It's the deadlock message that bothers me. I can't see how we could have ended there. We detect a stall and when trying to dump the stack LOCKDEP spits the warni