Re: [PATCH V1 0/1] tick: broadcast-hrtimer: Fix a race in bc_set_next

2019-09-20 Thread Eugeniu Rosca
+linux-renesas-soc In hope that the issue reported in [1] was seen by other members of Renesas community. [1] https://lkml.org/lkml/2019/9/18/711 On Wed, Sep 18, 2019 at 04:41:37PM +0200, Balasubramani Vivekanandan wrote: > I was investigating a rcu stall warning on ARM64 Renesas Rcar3 > platfor

Re: [PATCH V1 0/1] tick: broadcast-hrtimer: Fix a race in bc_set_next

2019-09-20 Thread Eugeniu Rosca
+linux-renesas-soc In hope that the issue reported in [1] was seen by other members of Renesas community. [1] https://lkml.org/lkml/2019/9/18/711 On Wed, Sep 18, 2019 at 04:41:37PM +0200, Balasubramani Vivekanandan wrote: > I was investigating a rcu stall warning on ARM64 Renesas Rcar3 > platfor

[PATCH V1 0/1] tick: broadcast-hrtimer: Fix a race in bc_set_next

2019-09-18 Thread Balasubramani Vivekanandan
I was investigating a rcu stall warning on ARM64 Renesas Rcar3 platform. On analysis I found that rcu stall warning was because the rcu_preempt kthread was starved of cpu time. rcu_preempt was blocked in the function schedule_timeout() and never woken up. On further investigation I found that local