linux-kernel - Re: [tip: timers/core] hrtimer: Consolidate reprogramming code

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Date:   Thu, 12 Aug 2021 09:19:31 +0200
From:   Mike Galbraith <efault@....de>
To:     linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org
Subject: Re: [tip: timers/core] hrtimer: Consolidate reprogramming code

Greetings Peter, may your day get off to a better start than my box's
did :)

On Tue, 2021-08-10 at 16:02 +0000, tip-bot2 for Peter Zijlstra wrote:
> The following commit has been merged into the timers/core branch of tip:
>
> Commit-ID:     b14bca97c9f5c3e3f133445b01c723e95490d843
> Gitweb:        https://git.kernel.org/tip/b14bca97c9f5c3e3f133445b01c723e95490d843
> Author:        Peter Zijlstra <peterz@...radead.org>
> AuthorDate:    Tue, 13 Jul 2021 15:39:47 +02:00
> Committer:     Thomas Gleixner <tglx@...utronix.de>
> CommitterDate: Tue, 10 Aug 2021 17:57:22 +02:00
>
> hrtimer: Consolidate reprogramming code

Per git-bisect, this is the tip.today commit that's bricking my box
early in boot.  Another inspires the moan below, courtesy of VM, which
unlike desktop box does not brick immediately thereafter.

[    0.556416] rtc_cmos 00:04: RTC can wake from S4
[    0.557184] rtc_cmos 00:04: registered as rtc0
[    0.557636] BUG: using smp_processor_id() in preemptible [00000000] code: swapper/0/1
[    0.558169] caller is debug_smp_processor_id+0x13/0x20
[    0.558511] CPU: 3 PID: 1 Comm: swapper/0 Not tainted 5.14.0.g1fd628c-tip #15
[    0.558946] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a-rebuilt.opensuse.org 04/01/2014
[    0.559623] Call Trace:
[    0.559796]  dump_stack_lvl+0x62/0x78
[    0.560041]  dump_stack+0xc/0xd
[    0.560263]  check_preemption_disabled+0xd3/0xe0
[    0.560576]  debug_smp_processor_id+0x13/0x20
[    0.560954]  clock_was_set+0x1c/0x310
[    0.561118]  ? timekeeping_update+0x298/0x2b0
[    0.561118]  do_settimeofday64+0x31e/0x340
[    0.561118]  __devm_rtc_register_device+0x371/0x450
[    0.561118]  cmos_do_probe+0x4a2/0x6e0
[    0.561118]  ? cmos_interrupt+0x120/0x120
[    0.561118]  ? cmos_nvram_read+0x90/0x90
[    0.561118]  cmos_pnp_probe+0x91/0xe0
[    0.561118]  pnp_device_probe+0x15e/0x1d0
[    0.561118]  ? cmos_irq_enable+0x150/0x150
[    0.561118]  call_driver_probe+0x4a/0x130
[    0.561118]  really_probe+0x150/0x540
[    0.561118]  __driver_probe_device+0x160/0x200
[    0.561118]  driver_probe_device+0x3a/0x2b0
[    0.561118]  __driver_attach+0xb4/0x370
[    0.561118]  ? driver_attach+0x30/0x30
[    0.561118]  bus_for_each_dev+0xb0/0xe0
[    0.561118]  driver_attach+0x27/0x30
[    0.561118]  bus_add_driver+0x1ba/0x310
[    0.561118]  driver_register+0x104/0x200
[    0.561118]  pnp_register_driver+0x3e/0x50
[    0.561118]  ? rtc_dev_init+0x33/0x33
[    0.561118]  cmos_init+0x14/0xbc
[    0.561118]  ? rtc_dev_init+0x33/0x33
[    0.561118]  do_one_initcall+0xcf/0x2c0
[    0.561118]  ? strlen+0x18/0x30
[    0.561118]  ? parse_one+0x2b9/0x350
[    0.561118]  ? do_initcall_level+0x106/0x106
[    0.561118]  ? parse_args+0x133/0x280
[    0.561118]  ? parse_args+0x94/0x280
[    0.561118]  do_initcall_level+0x95/0x106
[    0.561118]  do_initcalls+0x61/0x8b
[    0.561118]  do_basic_setup+0x20/0x21
[    0.561118]  kernel_init_freeable+0x171/0x1de
[    0.561118]  ? rest_init+0xf0/0xf0
[    0.561118]  kernel_init+0x17/0x1e0
[    0.561118]  ? rest_init+0xf0/0xf0
[    0.561118]  ret_from_fork+0x1f/0x30