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Message-ID: <20200925175846.GG29330@paulmck-ThinkPad-P72>
Date: Fri, 25 Sep 2020 10:58:46 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: Naresh Kamboju <naresh.kamboju@...aro.org>
Cc: linux- stable <stable@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
rcu@...r.kernel.org, Joel Fernandes <joel@...lfernandes.org>,
Steven Rostedt <rostedt@...dmis.org>,
Peter Zijlstra <peterz@...radead.org>,
Namhyung Kim <namhyung@...nel.org>,
Sasha Levin <sashal@...nel.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
LTP List <ltp@...ts.linux.it>, lkft-triage@...ts.linaro.org
Subject: Re: [stable 5.8] rcu: INFO: rcu_sched self-detected stall on CPU -
RIP: 0010:trace_graph_return
On Fri, Sep 25, 2020 at 12:40:43PM +0530, Naresh Kamboju wrote:
> While running LTP trace test case on qemu_x86_64, qemu_i386 and i386
> the following kernel rcu: INFO reported.
>
> Easily reproducible on qemu_x86_64, qemu_i386 and i386 devices.
>
> steps to reproduce:
> # Boot qemu_x86_64 or qemu i386 or i386 with trace configs enabled.
> # cd /opt/ltp
> # ./runltp -f tracing
>
> metadata:
> git branch: linux-5.8.y
> git repo: https://gitlab.com/Linaro/lkft/mirrors/stable/linux-stable-rc
> git commit: f2ae9d9cdf48e015834ce21030249793bf0c44f5
> git describe: v5.8.9-296-gf2ae9d9cdf48
> make_kernelversion: 5.8.11-rc1
> kernel-config:
> https://builds.tuxbuild.com/SQySbShzDnHK3CzpR1T7GA/kernel.config
Does this complete normally if booted with the kernel boot parameter
rcupdate.rcu_cpu_stall_suppress=1? Alternatively, with something like
rcupdate.rcu_cpu_stall_timeout=300?
My guess is that it does pass with stalls suppressed, and maybe also with
the stall timeout lengthened to 300 seconds. If so, this might indicate
that the stall is just due to higher overhead from complex tracing. But
at that point I would need to defer to the tracing folks.
Thanx, Paul
> [ 99.868127] rcu: INFO: rcu_sched self-detected stall on CPU
> [ 99.868127] rcu: 3-....: (1 GPs behind)
> idle=d66/1/0x4000000000000000 softirq=2573/2600 fqs=3631
> [ 99.868127] (t=21003 jiffies g=2909 q=4480)
> [ 99.868127] NMI backtrace for cpu 3
> [ 99.868127] CPU: 3 PID: 781 Comm: sh Not tainted 5.8.11-rc1 #1
> [ 99.868127] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> BIOS 1.12.0-1 04/01/2014
> [ 99.874535] Call Trace:
> [ 99.874535] <IRQ>
> [ 99.874535] ? ftrace_graph_caller+0xc0/0xc0
> [ 99.874535] dump_stack+0x81/0xba
> [ 99.874535] nmi_cpu_backtrace.cold+0x14/0x54
> [ 99.874535] ? lapic_can_unplug_cpu.cold+0x3b/0x3b
> [ 99.874535] nmi_trigger_cpumask_backtrace+0x85/0x92
> [ 99.874535] arch_trigger_cpumask_backtrace+0x19/0x20
> [ 99.874535] ? ftrace_graph_caller+0xc0/0xc0
> [ 99.874535] rcu_dump_cpu_stacks+0xa0/0xd2
> [ 99.874535] ? ftrace_graph_caller+0xc0/0xc0
> [ 99.874535] rcu_sched_clock_irq.cold+0x23a/0x41c
> [ 99.874535] ? rcu_sched_clock_irq+0x5/0x490
> [ 99.874535] ? ftrace_graph_caller+0xc0/0xc0
> [ 99.874535] update_process_times+0x28/0x60
> [ 99.874535] ? ftrace_graph_caller+0xc0/0xc0
> [ 99.874535] tick_sched_handle.isra.0+0x34/0x50
> [ 99.874535] ? ftrace_graph_caller+0xc0/0xc0
> [ 99.874535] tick_sched_timer+0x40/0x80
> [ 99.874535] ? ftrace_graph_caller+0xc0/0xc0
> [ 99.874535] __hrtimer_run_queues+0x96/0x2b0
> [ 99.874535] ? tick_sched_handle.isra.0+0x50/0x50
> [ 99.874535] ? ftrace_graph_caller+0xc0/0xc0
> [ 99.874535] hrtimer_interrupt+0x109/0x220
> [ 99.874535] ? ftrace_graph_caller+0xc0/0xc0
> [ 99.874535] __sysvec_apic_timer_interrupt+0x64/0x100
> [ 99.874535] ? ftrace_graph_caller+0xc0/0xc0
> [ 99.874535] asm_call_on_stack+0x12/0x20
> [ 99.874535] </IRQ>
> [ 99.874535] sysvec_apic_timer_interrupt+0x7e/0x90
> [ 99.874535] asm_sysvec_apic_timer_interrupt+0x12/0x20
> [ 99.874535] RIP: 0010:__text_poke+0x367/0x3f0
> [ 99.874535] Code: 14 25 80 6d 01 00 e8 b8 80 03 00 65 48 8b 05 d0
> f0 76 63 a8 aa 75 58 ba 00 10 00 00 e9 d9 fe ff ff e8 3d 8f 1f 00 ff
> 75 c0 9d <e9> 1a ff ff ff 4c 89 e7 e8 8c 0a 29 00 48 89 c1 49 81 ff 00
> 10 00
> [ 99.874535] RSP: 0018:ffffa932c0947c40 EFLAGS: 00000286
> [ 99.874535] RAX: ffffa932c0947ca8 RBX: ffff8ce37b16deb8 RCX: 0000000000000000
> [ 99.874535] RDX: 0000000000000001 RSI: ffffffff9c8d2550 RDI: ffffffff9c8a7c03
> [ 99.874535] RBP: ffffa932c0947ca8 R08: ffff8ce3619cc280 R09: ffff8ce3619d7000
> [ 99.874535] R10: 0000000000000668 R11: ffff8ce3619d7678 R12: ffffffff9d0a8620
> [ 99.874535] R13: 0000000000000001 R14: ffffffff9e5b7de9 R15: 0000000000000621
> [ 99.874535] ? dpm_suspend+0x240/0x240
> [ 99.912445] ? ftrace_graph_caller+0xc0/0xc0
> [ 99.912445] ? __text_poke+0x363/0x3f0
> [ 99.912445] ? ftrace_graph_caller+0xc0/0xc0
> [ 99.912445] text_poke_bp_batch+0x123/0x190
> [ 99.912445] ? node_access_release+0x10/0x10
> [ 99.912445] ? ftrace_graph_caller+0xc0/0xc0
> [ 99.912445] text_poke_queue+0xa7/0xd0
> [ 99.912445] ? ftrace_graph_caller+0xc0/0xc0
> [ 99.912445] ftrace_replace_code+0x11f/0x170
> [ 99.912445] ftrace_modify_all_code+0xc8/0x160
> [ 99.912445] arch_ftrace_update_code+0x9/0x10
> [ 99.912445] ftrace_run_update_code+0x1a/0x70
> [ 99.912445] ftrace_startup_enable+0x2e/0x50
> [ 99.912445] ftrace_startup+0xa4/0x100
> [ 99.912445] register_ftrace_function+0x25/0x70
> [ 99.912445] stack_trace_sysctl+0x77/0x9c
> [ 99.912445] proc_sys_call_handler+0x164/0x190
> [ 99.912445] proc_sys_write+0x14/0x20
> [ 99.912445] vfs_write+0xc9/0x200
> [ 99.912445] ksys_write+0x67/0xe0
> [ 99.912445] __x64_sys_write+0x1a/0x20
> [ 99.912445] do_syscall_64+0x51/0x90
> [ 99.912445] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [ 99.912445] RIP: 0033:0x7f1163016144
> [ 99.912445] Code: 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00
> 00 00 00 00 66 90 48 8d 05 c1 e7 2c 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 41 54 49 89 d4 55 48 89
> f5 53
> [ 99.912445] RSP: 002b:00007ffe884a34d8 EFLAGS: 00000246 ORIG_RAX:
> 0000000000000001
> [ 99.912445] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f1163016144
> [ 99.912445] RDX: 0000000000000002 RSI: 0000000001852ea0 RDI: 0000000000000001
> [ 99.912445] RBP: 0000000001852ea0 R08: 000000000000000a R09: 00007f11630633e0
> [ 99.912445] R10: 000000000000000a R11: 0000000000000246 R12: 00007f11632e0760
> [ 99.912445] R13: 0000000000000002 R14: 00007f11632db760 R15: 0000000000000002
> [ 173.329178] rcu: INFO: rcu_sched self-detected stall on CPU
> [ 173.329178] rcu: 2-....: (20973 ticks this GP)
> idle=a4a/1/0x4000000000000000 softirq=3412/3412 fqs=4832
> [ 173.329178] (t=21000 jiffies g=3197 q=7683)
> [ 173.329178] NMI backtrace for cpu 2
> [ 173.329178] CPU: 2 PID: 781 Comm: sh Not tainted 5.8.11-rc1 #1
> [ 173.329178] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> BIOS 1.12.0-1 04/01/2014
> [ 173.329178] Call Trace:
> [ 173.329178] <IRQ>
> [ 173.329178] ? ftrace_graph_caller+0xc0/0xc0
> [ 173.329178] dump_stack+0x81/0xba
> [ 173.329178] nmi_cpu_backtrace.cold+0x14/0x54
> [ 173.329178] ? lapic_can_unplug_cpu.cold+0x3b/0x3b
> [ 173.329178] nmi_trigger_cpumask_backtrace+0x85/0x92
> [ 173.329178] arch_trigger_cpumask_backtrace+0x19/0x20
> [ 173.329178] ? ftrace_graph_caller+0xc0/0xc0
> [ 173.329178] rcu_dump_cpu_stacks+0xa0/0xd2
> [ 173.329178] ? ftrace_graph_caller+0xc0/0xc0
> [ 173.329178] rcu_sched_clock_irq.cold+0x23a/0x41c
> [ 173.329178] ? rcu_sched_clock_irq+0x5/0x490
> [ 173.329178] ? ftrace_graph_caller+0xc0/0xc0
> [ 173.329178] update_process_times+0x28/0x60
> [ 173.329178] ? ftrace_graph_caller+0xc0/0xc0
> [ 173.329178] tick_sched_handle.isra.0+0x34/0x50
> [ 173.329178] ? ftrace_graph_caller+0xc0/0xc0
> [ 173.329178] tick_sched_timer+0x40/0x80
> [ 173.329178] ? ftrace_graph_caller+0xc0/0xc0
> [ 173.329178] __hrtimer_run_queues+0x96/0x2b0
> [ 173.329178] ? tick_sched_handle.isra.0+0x50/0x50
> [ 173.329178] ? ftrace_graph_caller+0xc0/0xc0
> [ 173.329178] hrtimer_interrupt+0x109/0x220
> [ 173.329178] ? ftrace_graph_caller+0xc0/0xc0
> [ 173.329178] __sysvec_apic_timer_interrupt+0x64/0x100
> [ 173.329178] ? ftrace_graph_caller+0xc0/0xc0
> [ 173.329178] asm_call_on_stack+0x12/0x20
> [ 173.329178] </IRQ>
> [ 173.329178] sysvec_apic_timer_interrupt+0x7e/0x90
> [ 173.329178] asm_sysvec_apic_timer_interrupt+0x12/0x20
> [ 173.329178] RIP: 0010:__text_poke+0x367/0x3f0
> [ 173.329178] Code: 14 25 80 6d 01 00 e8 b8 80 03 00 65 48 8b 05 d0
> f0 76 63 a8 aa 75 58 ba 00 10 00 00 e9 d9 fe ff ff e8 3d 8f 1f 00 ff
> 75 c0 9d <e9> 1a ff ff ff 4c 89 e7 e8 8c 0a 29 00 48 89 c1 49 81 ff 00
> 10 00
> [ 173.372903] RSP: 0018:ffffa932c0947c40 EFLAGS: 00000282
> [ 173.374214] RAX: ffffa932c0947ca8 RBX: ffff8ce37b16deb8 RCX: 0000000000000000
> [ 173.374214] RDX: 0000000000000001 RSI: ffffffff9c8d2550 RDI: ffffffff9c8a7c03
> [ 173.374214] RBP: ffffa932c0947ca8 R08: ffff8ce3618c8a00 R09: ffff8ce3618f1000
> [ 173.374214] R10: 0000000000000f40 R11: ffff8ce3618f1f50 R12: ffffffff9caf68e1
> [ 173.374214] R13: 0000000000000004 R14: ffffffff9e5b798a R15: 00000000000008e5
> [ 173.374214] ? mark_page_lazyfree+0x1/0x130
> [ 173.374214] ? ftrace_graph_caller+0xc0/0xc0
> [ 173.374214] ? __text_poke+0x363/0x3f0
> [ 173.374214] ? ftrace_graph_caller+0xc0/0xc0
> [ 173.374214] text_poke_bp_batch+0xd4/0x190
> [ 173.374214] ? frag_start+0x40/0x40
> [ 173.374214] ? ftrace_graph_caller+0xc0/0xc0
> [ 173.374214] text_poke_queue+0xa7/0xd0
> [ 173.374214] ? ftrace_graph_caller+0xc0/0xc0
> [ 173.374214] ftrace_replace_code+0x11f/0x170
> [ 173.397011] ftrace_modify_all_code+0xc8/0x160
> [ 173.397011] arch_ftrace_update_code+0x9/0x10
> [ 173.397011] ftrace_run_update_code+0x1a/0x70
> [ 173.397011] ftrace_startup_enable+0x2e/0x50
> [ 173.397011] ftrace_startup+0xa4/0x100
> [ 173.397011] register_ftrace_function+0x25/0x70
> [ 173.397011] stack_trace_sysctl+0x77/0x9c
> [ 173.397011] proc_sys_call_handler+0x164/0x190
> [ 173.397011] proc_sys_write+0x14/0x20
> [ 173.397011] vfs_write+0xc9/0x200
> [ 173.397011] ksys_write+0x67/0xe0
> [ 173.397011] __x64_sys_write+0x1a/0x20
> [ 173.397011] do_syscall_64+0x51/0x90
> [ 173.397011] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [ 173.397011] RIP: 0033:0x7f1163016144
> [ 173.397011] Code: 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00
> 00 00 00 00 66 90 48 8d 05 c1 e7 2c 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 41 54 49 89 d4 55 48 89
> f5 53
> [ 173.397011] RSP: 002b:00007ffe884a34d8 EFLAGS: 00000246 ORIG_RAX:
> 0000000000000001
> [ 173.397011] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f1163016144
> [ 173.397011] RDX: 0000000000000002 RSI: 0000000001852ea0 RDI: 0000000000000001
> [ 173.397011] RBP: 0000000001852ea0 R08: 000000000000000a R09: 00007f11630633e0
> [ 173.397011] R10: 000000000000000a R11: 0000000000000246 R12: 00007f11632e0760
> [ 173.397011] R13: 0000000000000002 R14: 00007f11632db760 R15: 0000000000000002
>
> [ 236.332272] rcu: INFO: rcu_sched self-detected stall on CPU
> [ 236.332288] rcu: 2-....: (83813 ticks this GP)
> idle=a4a/1/0x4000000000000000 softirq=3412/3412 fqs=18275
> [ 236.332288] (t=84003 jiffies g=3197 q=21302)
> [ 236.332288] NMI backtrace for cpu 2
> [ 236.332288] CPU: 2 PID: 781 Comm: sh Not tainted 5.8.11-rc1 #1
> [ 236.332288] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> BIOS 1.12.0-1 04/01/2014
> [ 236.332288] Call Trace:
> [ 236.332288] <IRQ>
> [ 236.332288] ? ftrace_graph_caller+0xc0/0xc0
> [ 236.332288] dump_stack+0x81/0xba
> [ 236.332288] nmi_cpu_backtrace.cold+0x14/0x54
> [ 236.332288] ? lapic_can_unplug_cpu.cold+0x3b/0x3b
> [ 236.332288] nmi_trigger_cpumask_backtrace+0x85/0x92
> [ 236.332288] arch_trigger_cpumask_backtrace+0x19/0x20
> [ 236.332288] ? ftrace_graph_caller+0xc0/0xc0
> [ 236.332288] rcu_dump_cpu_stacks+0xa0/0xd2
> [ 236.332288] ? ftrace_graph_caller+0xc0/0xc0
> [ 236.332288] rcu_sched_clock_irq.cold+0x23a/0x41c
> [ 236.332288] ? rcu_sched_clock_irq+0x5/0x490
> [ 236.332288] ? ftrace_graph_caller+0xc0/0xc0
> [ 236.332288] update_process_times+0x28/0x60
> [ 236.332288] ? ftrace_graph_caller+0xc0/0xc0
> [ 236.332288] tick_sched_handle.isra.0+0x34/0x50
> [ 236.332288] ? ftrace_graph_caller+0xc0/0xc0
> [ 236.332288] tick_sched_timer+0x40/0x80
> [ 236.332288] ? ftrace_graph_caller+0xc0/0xc0
> [ 236.332288] __hrtimer_run_queues+0x96/0x2b0
> [ 236.332288] ? tick_sched_handle.isra.0+0x50/0x50
> [ 236.332288] ? ftrace_graph_caller+0xc0/0xc0
> [ 236.332288] hrtimer_interrupt+0x109/0x220
> [ 236.332288] ? ftrace_graph_caller+0xc0/0xc0
> [ 236.332288] __sysvec_apic_timer_interrupt+0x64/0x100
> [ 236.332288] ? ftrace_graph_caller+0xc0/0xc0
> [ 236.332288] asm_call_on_stack+0x12/0x20
> [ 236.332288] </IRQ>
> [ 236.332288] sysvec_apic_timer_interrupt+0x7e/0x90
> [ 236.332288] asm_sysvec_apic_timer_interrupt+0x12/0x20
> [ 236.332288] RIP: 0010:trace_graph_entry+0x1ce/0x200
> [ 236.332288] Code: 8b 15 a6 33 57 63 81 e2 00 00 0f 00 74 24 48 81
> 88 c8 09 00 00 00 02 00 00 e9 c4 fe ff ff e9 bf fe ff ff e8 84 d1 ff
> ff 53 9d <8b> 45 dc e9 4d fe ff ff 48 81 a0 c8 09 00 00 ff fd ff ff e9
> a0 fe
> [ 236.332288] RSP: 0018:ffffa932c0947a88 EFLAGS: 00000246
> [ 236.332288] RAX: ffffa932c0947ab0 RBX: 0000000000000246 RCX: 0000000000000000
> [ 236.332288] RDX: 0000000000000001 RSI: ffffffff9caa7fad RDI: ffffffff9caa39bc
> [ 236.332288] RBP: ffffa932c0947ab0 R08: ffff8ce361887800 R09: ffff8ce3618a8000
> [ 236.332288] R10: 0000000000000cf0 R11: ffff8ce3618a8d00 R12: ffffffff9e274520
> [ 236.332288] R13: ffffa932c0947adc R14: ffff8ce37bd2ca20 R15: ffffffff9e5c7e80
> [ 236.332288] ? ftrace_graph_entry_test+0x2d/0x40
> [ 236.332288] ? trace_graph_entry+0x1cc/0x200
> [ 236.332288] ? insn_get_sib.part.0+0x60/0x60
> [ 236.332288] ftrace_graph_entry_test+0x2d/0x40
> [ 236.332288] ? insn_get_immediate.part.0+0x1ae/0x330
> [ 236.332288] function_graph_enter+0xe8/0x140
> [ 236.332288] ? insn_get_sib.part.0+0x60/0x60
> [ 236.332288] ? insn_get_immediate.part.0+0x1ae/0x330
> [ 236.332288] prepare_ftrace_return+0x5c/0x80
> [ 236.332288] ? mipi_dsi_dcs_write+0xa0/0xa0
> [ 236.332288] ftrace_graph_caller+0x81/0xc0
> [ 236.332288] ? mipi_dsi_dcs_write+0xa0/0xa0
> [ 236.332288] ? ftrace_graph_caller+0x81/0xc0
> [ 236.332288] ? mipi_dsi_dcs_write+0xa0/0xa0
> [ 236.332288] ? ftrace_graph_caller+0x81/0xc0
> [ 236.332288] ? ftrace_return_to_handler+0x8d/0xf0
> [ 236.332288] ? insn_get_displacement.part.0+0x5/0xd0
> [ 236.332288] ? insn_get_immediate.part.0+0x5/0x330
> [ 236.332288] insn_get_displacement.part.0+0x5/0xd0
> [ 236.332288] insn_get_immediate.part.0+0x1ae/0x330
> [ 236.332288] ? insn_get_displacement.part.0+0x5/0xd0
> [ 236.332288] ? ftrace_graph_caller+0xc0/0xc0
> [ 236.332288] ? insn_get_immediate.part.0+0x1ae/0x330
> [ 236.332288] ? ftrace_graph_caller+0xc0/0xc0
> [ 236.332288] insn_get_length+0x2c/0x40
> [ 236.332288] ? ftrace_graph_caller+0xc0/0xc0
> [ 236.332288] text_poke_loc_init+0x6f/0x160
> [ 236.332288] ? mipi_dsi_dcs_write+0xa0/0xa0
> [ 236.332288] ? ftrace_graph_caller+0xc0/0xc0
> [ 236.332288] text_poke_queue+0x84/0xd0
> [ 236.332288] ? ftrace_graph_caller+0xc0/0xc0
> [ 236.332288] ftrace_replace_code+0x11f/0x170
> [ 236.332288] ftrace_modify_all_code+0xc8/0x160
> [ 236.332288] arch_ftrace_update_code+0x9/0x10
> [ 236.332288] ftrace_run_update_code+0x1a/0x70
> [ 236.332288] ftrace_startup_enable+0x2e/0x50
> [ 236.332288] ftrace_startup+0xa4/0x100
> [ 236.332288] register_ftrace_function+0x25/0x70
> [ 236.332288] stack_trace_sysctl+0x77/0x9c
> [ 236.332288] proc_sys_call_handler+0x164/0x190
> [ 236.332288] proc_sys_write+0x14/0x20
> [ 236.332288] vfs_write+0xc9/0x200
> [ 236.332288] ksys_write+0x67/0xe0
> [ 236.332288] __x64_sys_write+0x1a/0x20
> [ 236.332288] do_syscall_64+0x51/0x90
> [ 236.332288] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [ 236.332288] RIP: 0033:0x7f1163016144
> [ 236.332288] Code: 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00
> 00 00 00 00 66 90 48 8d 05 c1 e7 2c 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 41 54 49 89 d4 55 48 89
> f5 53
> [ 236.332288] RSP: 002b:00007ffe884a34d8 EFLAGS: 00000246 ORIG_RAX:
> 0000000000000001
> [ 236.332288] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f1163016144
> [ 236.332288] RDX: 0000000000000002 RSI: 0000000001852ea0 RDI: 0000000000000001
> [ 236.332288] RBP: 0000000001852ea0 R08: 000000000000000a R09: 00007f11630633e0
> [ 236.332288] R10: 000000000000000a R11: 0000000000000246 R12: 00007f11632e0760
> [ 236.332288] R13: 0000000000000002 R14: 00007f11632db760 R15: 0000000000000002
>
> [ 299.335247] rcu: INFO: rcu_sched self-detected stall on CPU
> [ 299.335269] rcu: 2-....: (146579 ticks this GP)
> idle=a4a/1/0x4000000000000000 softirq=3412/3412 fqs=31785
> [ 299.335269] (t=147006 jiffies g=3197 q=35014)
> [ 299.335269] NMI backtrace for cpu 2
> [ 299.335269] CPU: 2 PID: 781 Comm: sh Not tainted 5.8.11-rc1 #1
> [ 299.335269] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> BIOS 1.12.0-1 04/01/2014
> [ 299.335269] Call Trace:
> [ 299.335269] <IRQ>
> [ 299.335269] ? ftrace_graph_caller+0xc0/0xc0
> [ 299.335269] dump_stack+0x81/0xba
> [ 299.335269] nmi_cpu_backtrace.cold+0x14/0x54
> [ 299.335269] ? lapic_can_unplug_cpu.cold+0x3b/0x3b
> [ 299.335269] nmi_trigger_cpumask_backtrace+0x85/0x92
> [ 299.335269] arch_trigger_cpumask_backtrace+0x19/0x20
> [ 299.335269] ? ftrace_graph_caller+0xc0/0xc0
> [ 299.335269] rcu_dump_cpu_stacks+0xa0/0xd2
> [ 299.335269] ? ftrace_graph_caller+0xc0/0xc0
> [ 299.335269] rcu_sched_clock_irq.cold+0x23a/0x41c
> [ 299.335269] ? rcu_sched_clock_irq+0x5/0x490
> [ 299.335269] ? ftrace_graph_caller+0xc0/0xc0
> [ 299.335269] update_process_times+0x28/0x60
> [ 299.335269] ? ftrace_graph_caller+0xc0/0xc0
> [ 299.335269] tick_sched_handle.isra.0+0x34/0x50
> [ 299.335269] ? ftrace_graph_caller+0xc0/0xc0
> [ 299.335269] tick_sched_timer+0x40/0x80
> [ 299.335269] ? ftrace_graph_caller+0xc0/0xc0
> [ 299.335269] __hrtimer_run_queues+0x96/0x2b0
> [ 299.335269] ? tick_sched_handle.isra.0+0x50/0x50
> [ 299.335269] ? ftrace_graph_caller+0xc0/0xc0
> [ 299.335269] hrtimer_interrupt+0x109/0x220
> [ 299.335269] ? ftrace_graph_caller+0xc0/0xc0
> [ 299.335269] __sysvec_apic_timer_interrupt+0x64/0x100
> [ 299.335269] ? ftrace_graph_caller+0xc0/0xc0
> [ 299.335269] asm_call_on_stack+0x12/0x20
> [ 299.335269] </IRQ>
> [ 299.335269] sysvec_apic_timer_interrupt+0x7e/0x90
> [ 299.335269] asm_sysvec_apic_timer_interrupt+0x12/0x20
> [ 299.335269] RIP: 0010:trace_graph_return+0xcf/0xf0
> [ 299.335269] Code: e8 26 fe ff ff f0 ff 0b 41 f7 c5 00 02 00 00 75
> 11 41 55 9d e8 b2 d2 ff ff 5b 41 5c 41 5d 41 5e 5d c3 e8 54 cf ff ff
> 41 55 9d <5b> 41 5c 41 5d 41 5e 5d c3 48 81 a2 c8 09 00 00 ff fb ff ff
> e9 56
> [ 299.335269] RSP: 0018:ffffa932c09479b8 EFLAGS: 00000246
> [ 299.335269] RAX: ffffa932c09479d8 RBX: ffff8ce37bd2ca20 RCX: 0000000000000000
> [ 299.335269] RDX: 0000000000000001 RSI: ffffffff9caa81ad RDI: ffffffff9caa3bec
> [ 299.335269] RBP: ffffa932c09479d8 R08: ffff8ce36198b680 R09: ffff8ce3619a6000
> [ 299.335269] R10: 0000000000000148 R11: ffff8ce3619a6158 R12: ffffa932c09479ec
> [ 299.335269] R13: 0000000000000246 R14: ffffffff9e274520 R15: ffffffff9ce140b0
> [ 299.335269] ? bad_get_user+0xd/0xd
> [ 299.335269] ? ftrace_return_to_handler+0x8d/0xf0
> [ 299.335269] ? trace_graph_return+0xcc/0xf0
> [ 299.335269] ? stack_trace_call+0x66/0x2f0
> [ 299.335269] ? insn_get_opcode.part.0+0xb7/0x1a0
> [ 299.335269] ftrace_return_to_handler+0x8d/0xf0
> [ 299.335269] return_to_handler+0x15/0x30
> [ 299.335269] ? ftrace_graph_caller+0xc0/0xc0
> [ 299.335269] ? stack_trace_call+0x66/0x2f0
> [ 299.335269] ? ftrace_ops_test+0x33/0x50
> [ 299.335269] ? insn_get_opcode.part.0+0xb7/0x1a0
> [ 299.335269] ? bad_get_user+0xd/0xd
> [ 299.335269] ftrace_ops_list_func+0x103/0x120
> [ 299.335269] ? release_hwdep_device+0x20/0x20
> [ 299.335269] ftrace_call+0x5/0x34
> [ 299.335269] ? trace_hardirqs_on+0x38/0xf0
> [ 299.335269] ? ftrace_return_to_handler+0x8d/0xf0
> [ 299.335269] ? inat_get_opcode_attribute+0x5/0x20
> [ 299.335269] inat_get_opcode_attribute+0x5/0x20
> [ 299.335269] insn_get_opcode.part.0+0xb7/0x1a0
> [ 299.335269] ? inat_get_opcode_attribute+0x5/0x20
> [ 299.335269] ? insn_get_opcode.part.0+0xb7/0x1a0
> [ 299.335269] ? ftrace_graph_caller+0xc0/0xc0
> [ 299.335269] insn_get_modrm.part.0+0x62/0xf0
> [ 299.335269] ? ftrace_graph_caller+0xc0/0xc0
> [ 299.335269] insn_get_sib.part.0+0x40/0x60
> [ 299.335269] ? ftrace_graph_caller+0xc0/0xc0
> [ 299.335269] insn_get_displacement.part.0+0x84/0xd0
> [ 299.335269] ? ftrace_graph_caller+0xc0/0xc0
> [ 299.335269] insn_get_immediate.part.0+0x1ae/0x330
> [ 299.335269] ? ftrace_graph_caller+0xc0/0xc0
> [ 299.335269] insn_get_length+0x2c/0x40
> [ 299.335269] ? ftrace_graph_caller+0xc0/0xc0
> [ 299.335269] text_poke_loc_init+0x6f/0x160
> [ 299.335269] ? release_hwdep_device+0x20/0x20
> [ 299.335269] ? ftrace_graph_caller+0xc0/0xc0
> [ 299.335269] text_poke_queue+0x84/0xd0
> [ 299.335269] ? ftrace_graph_caller+0xc0/0xc0
> [ 299.335269] ftrace_replace_code+0x11f/0x170
> [ 299.335269] ftrace_modify_all_code+0xc8/0x160
> [ 299.335269] arch_ftrace_update_code+0x9/0x10
> [ 299.335269] ftrace_run_update_code+0x1a/0x70
> [ 299.335269] ftrace_startup_enable+0x2e/0x50
> [ 299.335269] ftrace_startup+0xa4/0x100
> [ 299.335269] register_ftrace_function+0x25/0x70
> [ 299.335269] stack_trace_sysctl+0x77/0x9c
> [ 299.335269] proc_sys_call_handler+0x164/0x190
> [ 299.335269] proc_sys_write+0x14/0x20
> [ 299.335269] vfs_write+0xc9/0x200
> [ 299.335269] ksys_write+0x67/0xe0
> [ 299.335269] __x64_sys_write+0x1a/0x20
> [ 299.335269] do_syscall_64+0x51/0x90
> [ 299.335269] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [ 299.335269] RIP: 0033:0x7f1163016144
> [ 299.335269] Code: 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00
> 00 00 00 00 66 90 48 8d 05 c1 e7 2c 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 41 54 49 89 d4 55 48 89
> f5 53
> [ 299.335269] RSP: 002b:00007ffe884a34d8 EFLAGS: 00000246 ORIG_RAX:
> 0000000000000001
> [ 299.335269] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f1163016144
> [ 299.335269] RDX: 0000000000000002 RSI: 0000000001852ea0 RDI: 0000000000000001
> [ 299.335269] RBP: 0000000001852ea0 R08: 000000000000000a R09: 00007f11630633e0
> [ 299.335269] R10: 000000000000000a R11: 0000000000000246 R12: 00007f11632e0760
> [ 299.335269] R13: 0000000000000002 R14: 00007f11632db760 R15: 0000000000000002
>
>
> full test log,
> https://lkft.validation.linaro.org/scheduler/job/1779500#L1155
> https://lkft.validation.linaro.org/scheduler/job/1779336#L1180
> https://lkft.validation.linaro.org/scheduler/job/1779359#L1774
>
> --
> Linaro LKFT
> https://lkft.linaro.org
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