From: Michel Lespinasse <michel@lespinasse.org>
To: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Michel Lespinasse <michel@lespinasse.org>,
Peter Zijlstra <peterz@infradead.org>,
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Subject: Re: [PATCH 04/36] cpuidle,intel_idle: Fix CPUIDLE_FLAG_IRQ_ENABLE
Date: Fri, 29 Jul 2022 03:24:58 -0700 [thread overview]
Message-ID: <20220729102458.GA1695@lespinasse.org> (raw)
In-Reply-To: <20220728172053.GA3607379@paulmck-ThinkPad-P17-Gen-1>
On Thu, Jul 28, 2022 at 10:20:53AM -0700, Paul E. McKenney wrote:
> On Mon, Jul 25, 2022 at 12:43:06PM -0700, Michel Lespinasse wrote:
> > On Wed, Jun 08, 2022 at 04:27:27PM +0200, Peter Zijlstra wrote:
> > > Commit c227233ad64c ("intel_idle: enable interrupts before C1 on
> > > Xeons") wrecked intel_idle in two ways:
> > >
> > > - must not have tracing in idle functions
> > > - must return with IRQs disabled
> > >
> > > Additionally, it added a branch for no good reason.
> > >
> > > Fixes: c227233ad64c ("intel_idle: enable interrupts before C1 on Xeons")
> > > Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> >
> > After this change was introduced, I am seeing "WARNING: suspicious RCU
> > usage" when booting a kernel with debug options compiled in. Please
> > see the attached dmesg output. The issue starts with commit 32d4fd5751ea
> > and is still present in v5.19-rc8.
> >
> > I'm not sure, is this too late to fix or revert in v5.19 final ?
>
> I finally got a chance to take a quick look at this.
>
> The rcu_eqs_exit() function is making a lockdep complaint about
> being invoked with interrupts enabled. This function is called from
> rcu_idle_exit(), which is an expected code path from cpuidle_enter_state()
> via its call to rcu_idle_exit(). Except that rcu_idle_exit() disables
> interrupts before invoking rcu_eqs_exit().
>
> The only other call to rcu_idle_exit() does not disable interrupts,
> but it is via rcu_user_exit(), which would be a very odd choice for
> cpuidle_enter_state().
>
> It seems unlikely, but it might be that it is the use of local_irq_save()
> instead of raw_local_irq_save() within rcu_idle_exit() that is causing
> the trouble. If this is the case, then the commit shown below would
> help. Note that this commit removes the warning from lockdep, so it
> is necessary to build the kernel with CONFIG_RCU_EQS_DEBUG=y to enable
> equivalent debugging.
>
> Could you please try your test with the -rce commit shown below applied?
Thanks for looking into it.
After checking out Peter's commit 32d4fd5751ea,
cherry picking your commit ed4ae5eff4b3,
and setting CONFIG_RCU_EQS_DEBUG=y in addition of my usual debug config,
I am now seeing this a few seconds into the boot:
[ 3.010650] ------------[ cut here ]------------
[ 3.010651] WARNING: CPU: 0 PID: 0 at kernel/sched/clock.c:397 sched_clock_tick+0x27/0x60
[ 3.010657] Modules linked in:
[ 3.010660] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-rc1-test-00005-g1be22fea0611 #1
[ 3.010662] Hardware name: LENOVO 30BFS44D00/1036, BIOS S03KT51A 01/17/2022
[ 3.010663] RIP: 0010:sched_clock_tick+0x27/0x60
[ 3.010665] Code: 1f 40 00 53 eb 02 5b c3 66 90 8b 05 2f c3 40 01 85 c0 74 18 65 8b 05 60 88 8f 4e 85 c0 75 0d 65 8b 05 a9 85 8f 4e 85 c0 74 02 <0f> 0b e8 e2 6c 89 00 48 c7 c3 40 d5 02 00
89 c0 48 03 1c c5 c0 98
[ 3.010667] RSP: 0000:ffffffffb2803e28 EFLAGS: 00010002
[ 3.010670] RAX: 0000000000000001 RBX: ffffc8ce7fa07060 RCX: 0000000000000001
[ 3.010671] RDX: 0000000000000000 RSI: ffffffffb268dd21 RDI: ffffffffb269ab13
[ 3.010673] RBP: 0000000000000001 R08: ffffffffffc300d5 R09: 000000000002be80
[ 3.010674] R10: 000003625b53183a R11: ffffa012b802b7a4 R12: ffffffffb2aa9e80
[ 3.010675] R13: ffffffffb2aa9e00 R14: 0000000000000001 R15: 0000000000000000
[ 3.010677] FS: 0000000000000000(0000) GS:ffffa012b8000000(0000) knlGS:0000000000000000
[ 3.010678] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 3.010680] CR2: ffffa012f81ff000 CR3: 0000000c99612001 CR4: 00000000003706f0
[ 3.010681] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 3.010682] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 3.010683] Call Trace:
[ 3.010685] <TASK>
[ 3.010688] cpuidle_enter_state+0xb7/0x4b0
[ 3.010694] cpuidle_enter+0x29/0x40
[ 3.010697] do_idle+0x1d4/0x210
[ 3.010702] cpu_startup_entry+0x19/0x20
[ 3.010704] rest_init+0x117/0x1a0
[ 3.010708] arch_call_rest_init+0xa/0x10
[ 3.010711] start_kernel+0x6d8/0x6ff
[ 3.010716] secondary_startup_64_no_verify+0xce/0xdb
[ 3.010728] </TASK>
[ 3.010729] irq event stamp: 44179
[ 3.010730] hardirqs last enabled at (44179): [<ffffffffb2000ccb>] asm_sysvec_apic_timer_interrupt+0x1b/0x20
[ 3.010734] hardirqs last disabled at (44177): [<ffffffffb22003f0>] __do_softirq+0x3f0/0x498
[ 3.010736] softirqs last enabled at (44178): [<ffffffffb2200332>] __do_softirq+0x332/0x498
[ 3.010738] softirqs last disabled at (44171): [<ffffffffb16c760b>] irq_exit_rcu+0xab/0xf0
[ 3.010741] ---[ end trace 0000000000000000 ]---
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next prev parent reply other threads:[~2022-07-29 14:52 UTC|newest]
Thread overview: 103+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-08 14:27 [PATCH 00/36] cpuidle,rcu: Cleanup the mess Peter Zijlstra
2022-06-08 14:27 ` [PATCH 01/36] x86/perf/amd: Remove tracing from perf_lopwr_cb() Peter Zijlstra
2022-06-08 14:27 ` [PATCH 02/36] x86/idle: Replace x86_idle with a static_call Peter Zijlstra
2022-06-08 18:13 ` Rafael J. Wysocki
2022-06-08 14:27 ` [PATCH 03/36] cpuidle/poll: Ensure IRQ state is invariant Peter Zijlstra
2022-07-06 13:51 ` Rafael J. Wysocki
2022-06-08 14:27 ` [PATCH 04/36] cpuidle,intel_idle: Fix CPUIDLE_FLAG_IRQ_ENABLE Peter Zijlstra
2022-06-08 15:01 ` Rafael J. Wysocki
2022-06-08 15:48 ` Peter Zijlstra
2022-06-08 16:08 ` Rafael J. Wysocki
2022-06-09 23:49 ` Jacob Pan
2022-06-13 8:44 ` Peter Zijlstra
2022-06-16 21:26 ` Jacob Pan
2022-07-25 19:43 ` Michel Lespinasse
2022-07-28 17:20 ` Paul E. McKenney
2022-07-29 10:24 ` Michel Lespinasse [this message]
2022-07-29 14:59 ` Rafael J. Wysocki
2022-07-30 9:48 ` Michel Lespinasse
2022-07-30 19:52 ` Rafael J. Wysocki
2022-07-30 23:45 ` Michel Lespinasse
2022-07-29 15:26 ` Paul E. McKenney
2022-07-29 15:28 ` Paul E. McKenney
2022-07-30 9:40 ` Michel Lespinasse
2022-07-30 18:16 ` Paul E. McKenney
2022-06-08 14:27 ` [PATCH 05/36] cpuidle: Move IRQ state validation Peter Zijlstra
2022-07-06 13:54 ` Rafael J. Wysocki
2022-06-08 14:27 ` [PATCH 06/36] cpuidle,riscv: Push RCU-idle into driver Peter Zijlstra
2022-06-08 14:27 ` [PATCH 07/36] cpuidle,tegra: " Peter Zijlstra
2022-06-08 14:27 ` [PATCH 08/36] cpuidle,psci: " Peter Zijlstra
2022-06-08 14:27 ` [PATCH 09/36] cpuidle,imx6: " Peter Zijlstra
2022-06-08 14:27 ` [PATCH 10/36] cpuidle,omap3: " Peter Zijlstra
2022-06-13 12:33 ` Tony Lindgren
2022-06-08 14:27 ` [PATCH 11/36] cpuidle,armada: " Peter Zijlstra
2022-06-08 14:27 ` [PATCH 12/36] cpuidle,omap2: " Peter Zijlstra
2022-06-13 12:33 ` Tony Lindgren
2022-06-08 14:27 ` [PATCH 13/36] cpuidle,dt: " Peter Zijlstra
2022-06-08 14:27 ` [PATCH 14/36] cpuidle: Fix rcu_idle_*() usage Peter Zijlstra
2022-06-14 12:41 ` Mark Rutland
2022-06-14 16:40 ` Peter Zijlstra
2022-06-14 16:59 ` Mark Rutland
2022-07-26 9:56 ` Gautham R. Shenoy
2022-06-08 14:27 ` [PATCH 15/36] cpuidle,cpu_pm: Remove RCU fiddling from cpu_pm_{enter,exit}() Peter Zijlstra
2022-06-14 16:13 ` Mark Rutland
2022-06-14 16:42 ` Peter Zijlstra
2022-06-14 16:53 ` Mark Rutland
2022-06-08 14:27 ` [PATCH 16/36] rcu: Fix rcu_idle_exit() Peter Zijlstra
2022-06-14 16:14 ` Mark Rutland
2022-06-15 0:44 ` Paul E. McKenney
2022-06-08 14:27 ` [PATCH 17/36] acpi_idle: Remove tracing Peter Zijlstra
2022-07-06 13:59 ` Rafael J. Wysocki
2022-06-08 14:27 ` [PATCH 18/36] cpuidle: Annotate poll_idle() Peter Zijlstra
2022-07-06 14:00 ` Rafael J. Wysocki
2022-06-08 14:27 ` [PATCH 19/36] objtool/idle: Validate __cpuidle code as noinstr Peter Zijlstra
2022-07-06 9:46 ` Geert Uytterhoeven
2022-06-08 14:27 ` [PATCH 20/36] arch/idle: Change arch_cpu_idle() IRQ behaviour Peter Zijlstra
2022-06-08 16:22 ` Arnd Bergmann
2022-06-14 16:22 ` Mark Rutland
2022-07-06 14:02 ` Rafael J. Wysocki
2022-06-08 14:27 ` [PATCH 21/36] x86/tdx: Remove TDX_HCALL_ISSUE_STI Peter Zijlstra
2022-06-13 8:26 ` Lai Jiangshan
2022-06-13 8:41 ` Peter Zijlstra
2022-06-08 14:27 ` [PATCH 22/36] arm,smp: Remove trace_.*_rcuidle() usage Peter Zijlstra
2022-06-08 14:27 ` [PATCH 23/36] arm64,smp: " Peter Zijlstra
2022-06-14 16:24 ` Mark Rutland
2022-06-15 6:05 ` Marc Zyngier
2022-06-08 14:27 ` [PATCH 24/36] printk: " Peter Zijlstra
[not found] ` <YqG6URbihTNCk9YR@alley>
2022-06-09 10:02 ` Peter Zijlstra
2022-06-09 11:30 ` Sergey Senozhatsky
2022-06-09 13:02 ` Petr Mladek
2022-06-11 2:33 ` Sergey Senozhatsky
2022-06-14 14:37 ` Steven Rostedt
2022-06-09 13:06 ` Petr Mladek
2022-06-11 2:23 ` Sergey Senozhatsky
2022-06-08 14:27 ` [PATCH 25/36] time/tick-broadcast: Remove RCU_NONIDLE usage Peter Zijlstra
2022-06-14 16:28 ` Mark Rutland
2022-06-08 14:27 ` [PATCH 26/36] cpuidle,sched: Remove annotations from TIF_{POLLING_NRFLAG,NEED_RESCHED} Peter Zijlstra
2022-06-08 14:27 ` [PATCH 27/36] cpuidle,mwait: Make noinstr clean Peter Zijlstra
2022-06-08 14:27 ` [PATCH 28/36] cpuidle,tdx: Make tdx " Peter Zijlstra
2022-06-08 14:27 ` [PATCH 29/36] cpuidle,xenpv: Make more PARAVIRT_XXL " Peter Zijlstra
2022-06-13 18:48 ` Srivatsa S. Bhat
2022-06-13 19:23 ` [Pv-drivers] [PATCH 29/36] cpuidle, xenpv: " Nadav Amit
2022-06-14 16:44 ` Peter Zijlstra
2022-06-08 14:27 ` [PATCH 30/36] cpuidle,nospec: Make " Peter Zijlstra
2022-06-08 14:27 ` [PATCH 31/36] cpuidle,acpi: " Peter Zijlstra
2022-07-06 14:04 ` Rafael J. Wysocki
2022-06-08 14:27 ` [PATCH 32/36] ftrace: WARN on rcuidle Peter Zijlstra
2022-06-08 14:27 ` [PATCH 33/36] cpuidle,omap3: Use WFI for omap3_pm_idle() Peter Zijlstra
2022-06-08 16:28 ` Arnd Bergmann
2022-06-09 7:39 ` Tony Lindgren
2022-06-09 9:47 ` Peter Zijlstra
2022-06-09 9:40 ` Peter Zijlstra
2022-06-13 12:36 ` Tony Lindgren
2022-06-08 14:27 ` [PATCH 34/36] cpuidle,omap3: Push RCU-idle into omap_sram_idle() Peter Zijlstra
2022-06-08 15:04 ` Peter Zijlstra
2022-06-13 12:35 ` Tony Lindgren
2022-06-13 12:39 ` [PATCH 34.5/36] cpuidle,omap4: Push RCU-idle into omap4_enter_lowpower() Tony Lindgren
2022-06-14 22:12 ` Peter Zijlstra
2022-06-15 5:35 ` Tony Lindgren
2022-06-08 14:27 ` [PATCH 35/36] cpuidle,powerdomain: Remove trace_.*_rcuidle() Peter Zijlstra
2022-06-08 14:27 ` [PATCH 36/36] cpuidle,clk: " Peter Zijlstra
2022-06-14 11:19 ` [PATCH 00/36] cpuidle,rcu: Cleanup the mess Mark Rutland
2022-06-14 16:58 ` Peter Zijlstra
2022-06-14 17:33 ` Mark Rutland
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