That stack trace was in the log just before It stalled and hard locked.
This is the trace that happened next
Sep 28 08:37:34 gandolf kernel: [ 6142.796923] INFO: rcu_bh self-detected stall
on CPU
Sep 28 08:37:34 gandolf kernel: [ 6142.796926] 0-...: (1 GPs behind)
idle=653/140000000000001/0 softirq=72562/73365 fqs=56230
Sep 28 08:37:34 gandolf kernel: [ 6142.796927] (t=150012 jiffies g=-255
c=-256 q=10)
Sep 28 08:37:34 gandolf kernel: [ 6142.796928] Task dump for CPU 0:
Sep 28 08:37:34 gandolf kernel: [ 6142.796929] sshd R running task
0 3995 1 0x0000000c
Sep 28 08:37:34 gandolf kernel: [ 6142.796930] Call Trace:
Sep 28 08:37:34 gandolf kernel: [ 6142.796930] <IRQ>
Sep 28 08:37:34 gandolf kernel: [ 6142.796933] sched_show_task+0xd3/0x140
Sep 28 08:37:34 gandolf kernel: [ 6142.796934] dump_cpu_task+0x37/0x40
Sep 28 08:37:34 gandolf kernel: [ 6142.796936] rcu_dump_cpu_stacks+0x99/0xbd
Sep 28 08:37:34 gandolf kernel: [ 6142.796938] rcu_check_callbacks+0x703/0x850
Sep 28 08:37:34 gandolf kernel: [ 6142.796939] ? acct_account_cputime+0x1c/0x20
Sep 28 08:37:34 gandolf kernel: [ 6142.796940] ? account_system_time+0x7a/0x110
Sep 28 08:37:34 gandolf kernel: [ 6142.796942] ?
tick_sched_handle.isra.15+0x60/0x60
Sep 28 08:37:34 gandolf kernel: [ 6142.796943] update_process_times+0x2f/0x60
Sep 28 08:37:34 gandolf kernel: [ 6142.796944]
tick_sched_handle.isra.15+0x25/0x60
Sep 28 08:37:34 gandolf kernel: [ 6142.796945] tick_sched_timer+0x3d/0x70
Sep 28 08:37:34 gandolf kernel: [ 6142.796946] __hrtimer_run_queues+0xf3/0x270
Sep 28 08:37:34 gandolf kernel: [ 6142.796946] hrtimer_interrupt+0xa3/0x1e0
Sep 28 08:37:34 gandolf kernel: [ 6142.796948] ? leave_mm+0xc0/0xc0
Sep 28 08:37:34 gandolf kernel: [ 6142.796950]
local_apic_timer_interrupt+0x38/0x60
Sep 28 08:37:34 gandolf kernel: [ 6142.796951]
smp_apic_timer_interrupt+0x38/0x50
Sep 28 08:37:34 gandolf kernel: [ 6142.796952] apic_timer_interrupt+0x89/0x90
Sep 28 08:37:34 gandolf kernel: [ 6142.796953] RIP:
0010:smp_call_function_many+0x1ec/0x250
Sep 28 08:37:34 gandolf kernel: [ 6142.796954] RSP: 0018:ffffa8d682f73bd8
EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10
Sep 28 08:37:34 gandolf kernel: [ 6142.796954] RAX: 0000000000000003 RBX:
0000000000000004 RCX: 0000000000000001
Sep 28 08:37:34 gandolf kernel: [ 6142.796955] RDX: ffff9a92df49d0f8 RSI:
0000000000000004 RDI: ffff9a92ce81a780
Sep 28 08:37:34 gandolf kernel: [ 6142.796955] RBP: ffffa8d682f73c10 R08:
ffffffffffffffff R09: 000000000000000e
Sep 28 08:37:34 gandolf kernel: [ 6142.796956] R10: fffff99c100f5800 R11:
0000000000000010 R12: ffffffffb2275e20
Sep 28 08:37:34 gandolf kernel: [ 6142.796956] R13: 0000000000000000 R14:
ffff9a92df41a340 R15: 000000000001a300
Sep 28 08:37:34 gandolf kernel: [ 6142.796957] </IRQ>
Sep 28 08:37:34 gandolf kernel: [ 6142.796957] ? leave_mm+0xc0/0xc0
Sep 28 08:37:34 gandolf kernel: [ 6142.796958] ?
smp_call_function_many+0x1c8/0x250
Sep 28 08:37:34 gandolf kernel: [ 6142.796959] ? leave_mm+0xc0/0xc0
Sep 28 08:37:34 gandolf kernel: [ 6142.796960] on_each_cpu+0x2d/0x60
Sep 28 08:37:34 gandolf kernel: [ 6142.796960] flush_tlb_kernel_range+0x4b/0x80
Sep 28 08:37:34 gandolf kernel: [ 6142.796962] __purge_vmap_area_lazy+0x50/0xc0
Sep 28 08:37:34 gandolf kernel: [ 6142.796963] vm_unmap_aliases+0x113/0x150
Sep 28 08:37:34 gandolf kernel: [ 6142.796964]
change_page_attr_set_clr+0xf4/0x550
Sep 28 08:37:34 gandolf kernel: [ 6142.796965] ? bpf_convert_filter+0x66/0x950
Sep 28 08:37:34 gandolf kernel: [ 6142.796966] set_memory_ro+0x2f/0x40
Sep 28 08:37:34 gandolf kernel: [ 6142.796967]
bpf_prog_select_runtime+0x2a/0xd0
Sep 28 08:37:34 gandolf kernel: [ 6142.796968] bpf_prepare_filter+0x374/0x3e0
Sep 28 08:37:34 gandolf kernel: [ 6142.796969]
bpf_prog_create_from_user+0xbc/0x120
Sep 28 08:37:34 gandolf kernel: [ 6142.796970] ? watchdog_nmi_disable+0x70/0x70
Sep 28 08:37:34 gandolf kernel: [ 6142.796970] do_seccomp+0x124/0x5f0
Sep 28 08:37:34 gandolf kernel: [ 6142.796971] prctl_set_seccomp+0x24/0x50
Sep 28 08:37:34 gandolf kernel: [ 6142.796972] SyS_prctl+0x119/0x490
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https://bugs.launchpad.net/bugs/1697132
Title:
CPU Cores Stalls/Lock
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