rcu_sched detected stall is observed on a CPU upon a mlx5 device removal.

Solution Unverified - Updated -

Issue

  • rcu_sched detected stall is observed on a CPU upon a mlx5 device removal during server shutdown.
  • A task on the stalled CPU is getting stuck in a spinlock loop with a backtrace like this:


    call trace logged with rcu_sched detected CPU stall

Environment

  • Red Hat Enterprise Linux 8.2 (kernel-4.18.0-193.19.1.el8_2)
  • mlx5_ib inbox driver

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