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rcu stall on riscv5

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Mar 24th, 2022
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  1. [ 932.807097][ C0] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
  2. [ 932.810074][ C0] rcu: 1-...!: (19 ticks this GP) idle=84f/1/0x4000000000000000 softirq=17828/17830 fqs=38
  3. [ 932.818454][ C0] (detected by 0, t=30502 jiffies, g=38357, q=1)
  4. [ 932.820359][ C0] Task dump for CPU 1:
  5. [ 932.821695][ C0] task:syz-fuzzer state:R running task stack: 0 pid: 2018 ppid: 2015 flags:0x00000000
  6. [ 932.824662][ C0] Call Trace:
  7. [ 932.826514][ C0] rcu: rcu_preempt kthread timer wakeup didn't happen for 30425 jiffies! g38357 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
  8. [ 932.828654][ C0] rcu: Possible timer handling issue on cpu=0 timer-softirq=15037
  9. [ 932.830202][ C0] rcu: rcu_preempt kthread starved for 30426 jiffies! g38357 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
  10. [ 932.832260][ C0] rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
  11. [ 932.833863][ C0] rcu: RCU grace-period kthread stack dump:
  12. [ 932.835100][ C0] task:rcu_preempt state:I stack: 0 pid: 14 ppid: 2 flags:0x00000000
  13. [ 932.837154][ C0] Call Trace:
  14. [ 932.838108][ C0] [<ffffffff83146218>] schedule+0x72/0x14a
  15. [ 932.839766][ C0] [<ffffffff8314e05e>] schedule_timeout+0x120/0x200
  16. [ 932.841374][ C0] [<ffffffff80148b1c>] rcu_gp_fqs_loop+0x23e/0x59e
  17. [ 932.842983][ C0] [<ffffffff8014eb12>] rcu_gp_kthread+0x17c/0x1bc
  18. [ 932.844564][ C0] [<ffffffff800a5d96>] kthread+0x19c/0x1f8
  19. [ 932.846091][ C0] [<ffffffff80005698>] ret_from_exception+0x0/0x10
  20. [ 932.847637][ C0] rcu: Stack dump where RCU GP kthread last ran:
  21. [ 932.848823][ C0] Task dump for CPU 0:
  22. [ 932.849774][ C0] task:kworker/0:5 state:R running task stack: 0 pid: 2721 ppid: 2 flags:0x00000008
  23. [ 932.852410][ C0] Workqueue: events_power_efficient gc_worker
  24. [ 932.854091][ C0] Call Trace:
  25. [ 932.854992][ C0] [<ffffffff831071c2>] dump_backtrace+0x40/0x4e
  26. [ 932.856492][ C0] [<ffffffff831071f2>] show_stack+0x22/0x2e
  27. [ 932.857889][ C0] [<ffffffff800bbca2>] sched_show_task+0x304/0x3e0
  28. [ 932.859458][ C0] [<ffffffff83108960>] dump_cpu_task+0x5c/0x68
  29. [ 932.860920][ C0] [<ffffffff80146350>] rcu_check_gp_kthread_starvation+0x220/0x222
  30. [ 932.862728][ C0] [<ffffffff80152650>] rcu_sched_clock_irq+0x1ee4/0x2774
  31. [ 932.864263][ C0] [<ffffffff80167c74>] update_process_times+0x14e/0x19c
  32. [ 932.865780][ C0] [<ffffffff8018989c>] tick_sched_handle+0x5e/0xc8
  33. [ 932.867306][ C0] [<ffffffff8018a96a>] tick_sched_timer+0x108/0x18c
  34. [ 932.868816][ C0] [<ffffffff8016a598>] __hrtimer_run_queues+0x1e2/0xa10
  35. [ 932.870354][ C0] [<ffffffff8016bae6>] hrtimer_interrupt+0x1d4/0x3ea
  36. [ 932.871910][ C0] [<ffffffff822f3eaa>] riscv_timer_interrupt+0x5e/0x6c
  37. [ 932.873531][ C0] [<ffffffff8012ee54>] handle_percpu_devid_irq+0x17e/0x2a0
  38. [ 932.875136][ C0] [<ffffffff80122750>] generic_handle_domain_irq+0x7c/0x9c
  39. [ 932.876765][ C0] [<ffffffff80c2c93e>] riscv_intc_irq+0x7e/0xc8
  40. [ 932.878347][ C0] [<ffffffff83141494>] generic_handle_arch_irq+0x36/0x54
  41. [ 932.879969][ C0] [<ffffffff80005698>] ret_from_exception+0x0/0x10
  42. [ 932.881465][ C0] [<ffffffff80466bb8>] kmem_cache_alloc+0x7a/0x398
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