Got this stall, when trying to reboot. Apparently a Xenomai process can't be killed.
[ 350.298889] rcu: INFO: rcu_sched self-detected stall on CPU [ 350.304621] rcu: 2-....: (20999 ticks this GP) idle=546/1/0x4000000000000002 softirq=9363/9363 fqs=5108 [ 350.314280] rcu: (t=21000 jiffies g=26533 q=91) [ 350.319134] NMI backtrace for cpu 2 [ 350.322716] CPU: 2 PID: 1 Comm: systemd Tainted: G W 4.19.84-xeno8-static #1 [ 350.331151] Hardware name: TQ-Group TQMxE39M/Type2 - Board Product Name, BIOS 5.12.30.21.20 08/05/2019 [ 350.340542] I-pipe domain: Linux [ 350.343855] Call Trace: [ 350.346398] <IRQ> [ 350.348510] dump_stack+0x8c/0xc0 [ 350.351922] nmi_cpu_backtrace.cold+0x14/0x53 [ 350.356371] ? lapic_can_unplug_cpu.cold+0x42/0x42 [ 350.361255] nmi_trigger_cpumask_backtrace+0x7a/0x87 [ 350.366314] rcu_dump_cpu_stacks+0x86/0xbe [ 350.370507] rcu_check_callbacks.cold+0x1fb/0x363 [ 350.375318] update_process_times+0x41/0x80 [ 350.379595] tick_sched_handle+0x34/0x50 [ 350.383610] tick_sched_timer+0x38/0x80 [ 350.387540] __hrtimer_run_queues+0xfd/0x270 [ 350.391900] ? tick_sched_do_timer+0x60/0x60 [ 350.396277] hrtimer_interrupt+0x106/0x230 [ 350.400489] smp_apic_timer_interrupt+0x46/0x110 [ 350.405204] __ipipe_do_sync_stage+0x15d/0x1c0 [ 350.409748] __ipipe_handle_irq+0xa0/0x220 [ 350.413953] apic_timer_interrupt+0x12/0x40 [ 350.418225] </IRQ> [ 350.420419] RIP: 0010:smp_call_function_single+0xd5/0x120 [ 350.425907] Code: 00 00 75 5d 48 8d 65 e8 5b 41 5c 41 5d 5d c3 48 8d 74 24 20 4c 89 e2 4c 89 e9 e8 56 fe ff ff 8b 54 24 38 83 e2 01 74 0b f3 90 <8b> 54 24 38 83 e2 01 75 f5 eb bf 89 7c 24 1c e8 87 eb 01 00 8b 7c [ 350.444761] RSP: 0018:ffffa22840047b80 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 350.452471] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 000000000000000b [ 350.459687] RDX: 0000000000000001 RSI: ffff956bbb561548 RDI: 00000000000a0040 [ 350.466902] RBP: ffffa22840047bf8 R08: 00000000000a0040 R09: 000000000002e248 [ 350.474119] R10: 000000000000b2dc R11: 00000000006468fd R12: ffffffff8e56c120 [ 350.481338] R13: ffffa22840047c08 R14: ffffa22840047cb0 R15: ffffa22840047ce0 [ 350.488571] ? perf_cgroup_attach+0x70/0x70 [ 350.492878] ? trace+0x59/0x8d [ 350.496026] ? perf_cgroup_attach+0x70/0x70 [ 350.500306] ? smp_call_function_single+0x5/0x120 [ 350.505109] task_function_call+0x45/0x70 [ 350.509208] ? perf_cgroup_switch+0x170/0x170 [ 350.513657] perf_cgroup_attach+0x37/0x70 [ 350.517757] cgroup_migrate_execute+0x2c3/0x370 [ 350.522392] cgroup_attach_task+0x154/0x1f0 [ 350.526707] cgroup_procs_write+0xc7/0x100 [ 350.530905] cgroup_file_write+0x88/0x150 [ 350.535012] kernfs_fop_write+0x10b/0x190 [ 350.539121] __vfs_write+0x34/0x190 [ 350.542711] ? __vfs_write+0x5/0x190 [ 350.546377] ? rcu_all_qs+0x5/0x80 [ 350.549867] vfs_write+0xb6/0x190 [ 350.553282] ksys_write+0x57/0xd0 [ 350.556696] do_syscall_64+0x82/0x4e0 [ 350.560473] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 350.565614] RIP: 0033:0x7f6e72efd4e4 [ 350.569280] Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb bc 0f 1f 80 00 00 00 00 48 8d 05 19 22 0d 00 8b 00 85 c0 75 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 48 8d 64 24 d8 48 89 54 24 18 [ 350.588133] RSP: 002b:00007ffd434b8cb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 350.595845] RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f6e72efd4e4 [ 350.603061] RDX: 0000000000000005 RSI: 00007ffd434b8e8a RDI: 000000000000002a [ 350.610279] RBP: 00007ffd434b8e8a R08: 0000000000000000 R09: 0000000000000005 [ 350.617495] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005 [ 350.624714] R13: 00000000009abaf0 R14: 0000000000000005 R15: 00007f6e72fc6760 [ 413.301893] rcu: INFO: rcu_sched self-detected stall on CPU [ 413.307621] rcu: 2-....: (83670 ticks this GP) idle=546/1/0x4000000000000002 softirq=9363/9363 fqs=20382 [ 413.317366] rcu: (t=84003 jiffies g=26533 q=170) [ 413.322307] NMI backtrace for cpu 2 [ 413.325887] CPU: 2 PID: 1 Comm: systemd Tainted: G W 4.19.84-xeno8-static #1 [ 413.334321] Hardware name: TQ-Group TQMxE39M/Type2 - Board Product Name, BIOS 5.12.30.21.20 08/05/2019 [ 413.343712] I-pipe domain: Linux [ 413.347025] Call Trace: [ 413.349566] <IRQ> [ 413.351677] dump_stack+0x8c/0xc0 [ 413.355089] nmi_cpu_backtrace.cold+0x14/0x53 [ 413.359535] ? lapic_can_unplug_cpu.cold+0x42/0x42 [ 413.364418] nmi_trigger_cpumask_backtrace+0x7a/0x87 [ 413.369480] rcu_dump_cpu_stacks+0x86/0xbe [ 413.373672] rcu_check_callbacks.cold+0x1fb/0x363 [ 413.378482] update_process_times+0x41/0x80 [ 413.382761] tick_sched_handle+0x34/0x50 [ 413.386769] tick_sched_timer+0x38/0x80 [ 413.390698] __hrtimer_run_queues+0xfd/0x270 [ 413.395058] ? tick_sched_do_timer+0x60/0x60 [ 413.399434] hrtimer_interrupt+0x106/0x230 [ 413.403644] smp_apic_timer_interrupt+0x46/0x110 [ 413.408358] __ipipe_do_sync_stage+0x15d/0x1c0 [ 413.412904] __ipipe_handle_irq+0xa0/0x220 [ 413.417112] apic_timer_interrupt+0x12/0x40 [ 413.421382] </IRQ> [ 413.423576] RIP: 0010:smp_call_function_single+0xd5/0x120 [ 413.429063] Code: 00 00 75 5d 48 8d 65 e8 5b 41 5c 41 5d 5d c3 48 8d 74 24 20 4c 89 e2 4c 89 e9 e8 56 fe ff ff 8b 54 24 38 83 e2 01 74 0b f3 90 <8b> 54 24 38 83 e2 01 75 f5 eb bf 89 7c 24 1c e8 87 eb 01 00 8b 7c [ 413.447913] RSP: 0018:ffffa22840047b80 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 413.455622] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 000000000000000b [ 413.462838] RDX: 0000000000000001 RSI: ffff956bbb561548 RDI: 00000000000a0040 [ 413.470059] RBP: ffffa22840047bf8 R08: 00000000000a0040 R09: 000000000002e248 [ 413.477275] R10: 000000000000b2dc R11: 00000000006468fd R12: ffffffff8e56c120 [ 413.484491] R13: ffffa22840047c08 R14: ffffa22840047cb0 R15: ffffa22840047ce0 [ 413.491723] ? perf_cgroup_attach+0x70/0x70 [ 413.496032] ? trace+0x59/0x8d [ 413.499181] ? perf_cgroup_attach+0x70/0x70 [ 413.503461] ? smp_call_function_single+0x5/0x120 [ 413.508267] task_function_call+0x45/0x70 [ 413.512369] ? perf_cgroup_switch+0x170/0x170 [ 413.516820] perf_cgroup_attach+0x37/0x70 [ 413.520927] cgroup_migrate_execute+0x2c3/0x370 [ 413.525566] cgroup_attach_task+0x154/0x1f0 [ 413.529879] cgroup_procs_write+0xc7/0x100 [ 413.534074] cgroup_file_write+0x88/0x150 [ 413.538184] kernfs_fop_write+0x10b/0x190 [ 413.542293] __vfs_write+0x34/0x190 [ 413.545888] ? __vfs_write+0x5/0x190 [ 413.549555] ? rcu_all_qs+0x5/0x80 [ 413.553048] vfs_write+0xb6/0x190 [ 413.556467] ksys_write+0x57/0xd0 [ 413.559883] do_syscall_64+0x82/0x4e0 [ 413.563666] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 413.568808] RIP: 0033:0x7f6e72efd4e4 [ 413.572472] Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb bc 0f 1f 80 00 00 00 00 48 8d 05 19 22 0d 00 8b 00 85 c0 75 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 48 8d 64 24 d8 48 89 54 24 18 [ 413.591328] RSP: 002b:00007ffd434b8cb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 413.599039] RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f6e72efd4e4 [ 413.606259] RDX: 0000000000000005 RSI: 00007ffd434b8e8a RDI: 000000000000002a [ 413.613475] RBP: 00007ffd434b8e8a R08: 0000000000000000 R09: 0000000000000005 [ 413.620692] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005 [ 413.627909] R13: 00000000009abaf0 R14: 0000000000000005 R15: 00007f6e72fc6760 ________________________________ This message and any attachments are solely for the use of the intended recipients. 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