Finally able to trip a rcu timeout. 3.19.0-61-generic kernel on host, xenial on server, host busy on async i/o requests (via stress-ng):
[ 825.195520] systemd[1]: Started Journal Service. [ 900.108730] INFO: rcu_sched detected stalls on CPUs/tasks: [ 900.110254] 0-...: (4 GPs behind) idle=750/0/0 softirq=4668/4668 fqs=1 [ 900.111742] (detected by 2, t=15002 jiffies, g=1980, c=1979, q=90) [ 900.113384] Call trace: [ 900.114035] rcu_sched kthread starved for 15001 jiffies! g1980 c1979 f0x0 s3 ->state=0x1 [ 900.108730] INFO: rcu_sched detected stalls on CPUs/tasks: [ 900.110254] 0-...: (4 GPs behind) idle=750/0/0 softirq=4668/4668 fqs=1 [ 900.111742] (detected by 2, t=15002 jiffies, g=1980, c=1979, q=90) [ 900.113366] Task dump for CPU 0: [ 900.113375] swapper/0 R running task 0 0 0 0x00000000 [ 900.113384] Call trace: [ 900.113987] [<ffff800000086ad0>] __switch_to+0x90/0xa8 [ 900.113999] [<ffff800000143c40>] __tick_nohz_idle_enter+0x50/0x3f0 [ 900.114003] [<ffff800000144238>] tick_nohz_idle_enter+0x40/0x70 [ 900.114010] [<ffff80000010b8b0>] cpu_startup_entry+0x288/0x2d8 [ 900.114018] [<ffff8000008f18f0>] rest_init+0x80/0x88 [ 900.114025] [<ffff800000cb59f8>] start_kernel+0x3e8/0x414 [ 900.114029] [<00000000408fb000>] 0x408fb000 [ 900.114035] rcu_sched kthread starved for 15001 jiffies! g1980 c1979 f0x0 s3 ->state=0x1 Let me see if I can repro this on other kernels now -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1531768 Title: [arm64] lockups some time after booting To manage notifications about this bug go to: https://bugs.launchpad.net/auto-package-testing/+bug/1531768/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
