linux-kernel - Re: [PATCH] PCI/MSI: Move non-mask check back into low level accessors

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Message-ID: <20211104171218.GD174703@worktop.programming.kicks-ass.net>
Date:   Thu, 4 Nov 2021 18:12:18 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Josef Johansson <josef@...rland.se>, boris.ostrovsky@...cle.com,
        helgaas@...nel.org, jgross@...e.com, linux-pci@...r.kernel.org,
        maz@...nel.org, xen-devel@...ts.xenproject.org,
        Jason Andryuk <jandryuk@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Peter Jones <pjones@...hat.com>, linux-fbdev@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCH] PCI/MSI: Move non-mask check back into low level
 accessors

On Thu, Nov 04, 2021 at 12:45:29AM +0100, Thomas Gleixner wrote:
> On Wed, Oct 27 2021 at 17:29, Josef Johansson wrote:
> > ------------[ cut here ]------------
> > cfs_rq->avg.load_avg || cfs_rq->avg.util_avg || cfs_rq->avg.runnable_avg
> > installing Xen timer for CPU 4
> > WARNING: CPU: 3 PID: 455 at kernel/sched/fair.c:3339  __update_blocked_fair+0x49b/0x4b0
> 
> 	/*
> 	 * _avg must be null when _sum are null because _avg = _sum / divider
> 	 * Make sure that rounding and/or propagation of PELT values never
> 	 * break this.
> 	 */
> 	SCHED_WARN_ON(cfs_rq->avg.load_avg ||
> 		      cfs_rq->avg.util_avg ||
> 		      cfs_rq->avg.runnable_avg);
> 
> PeterZ, does that ring any bell?

Hurrr.. I thought we fixed all those. Vincent?

> > Modules linked in: snd_seq_dummy snd_hrtimer snd_seq snd_seq_device snd_timer nf_tables nfnetlink vfat fat intel_rapl_msr think_lmi firmware_attributes_class wmi_bmof intel_rapl_common pcspkr uvcvideo videobuf2_vmalloc videobuf2_memops joydev videobuf2_v4l2 sp5100_tco k10temp videobuf2_common i2c_piix4 iwlwifi videodev mc cfg80211 thinkpad_acpi ipmi_devintf ucsi_acpi platform_profile typec_ucsi ledtrig_audio ipmi_msghandler r8169 rfkill typec snd wmi soundcore video i2c_scmi fuse xenfs ip_tables dm_thin_pool dm_persistent_data dm_bio_prison dm_crypt trusted asn1_encoder hid_multitouch amdgpu crct10dif_pclmul crc32_pclmul crc32c_intel gpu_sched i2c_algo_bit drm_ttm_helper ghash_clmulni_intel ttm serio_raw drm_kms_helper cec sdhci_pci cqhci sdhci xhci_pci drm xhci_pci_renesas nvme xhci_hcd ehci_pci mmc_core ehci_hcd nvme_core xen_acpi_processor xen_privcmd xen_pciback xen_blkback xen_gntalloc xen_gntdev xen_evtchn uinput
> > CPU: 3 PID: 455 Comm: kworker/3:2 Tainted: G        W        --------- ---  5.15.0-0.rc7.0.fc32.qubes.x86_64 #1
> > Hardware name: LENOVO 20Y1S02400/20Y1S02400, BIOS R1BET65W(1.34 ) 06/17/2021
> > Workqueue:  0x0 (events)
> > RIP: e030:__update_blocked_fair+0x49b/0x4b0
> > Code: 6b fd ff ff 49 8b 96 48 01 00 00 48 89 90 50 09 00 00 e9 ff fc ff ff 48 c7 c7 10 7a 5e 82 c6 05 f3 35 9e 01 01 e8 1f f3 b2 00 <0f> 0b 41 8b 86 38 01 00 00 e9 c6 fc ff ff 0f 1f 80 00 00 00 00 0f
> > RSP: e02b:ffffc900410d7ce0 EFLAGS: 00010082
> > RAX: 0000000000000000 RBX: 0000000000000018 RCX: ffff8881406d8a08
> > RDX: 00000000ffffffd8 RSI: 0000000000000027 RDI: ffff8881406d8a00
> > RBP: ffff8881406e9800 R08: 0000000000000048 R09: ffffc900410d7c78
> > R10: 0000000000000049 R11: 000000002d2d2d2d R12: ffff8881406e9f80
> > R13: ffff8881406e9e40 R14: ffff8881406e96c0 R15: 0000000000000000
> > FS:  0000000000000000(0000) GS:ffff8881406c0000(0000) knlGS:0000000000000000
> > CS:  10000e030 DS: 0000 ES: 0000 CR0: 0000000080050033
> > CR2: 0000782e51820000 CR3: 0000000002810000 CR4: 0000000000050660
> > Call Trace:
> >  update_blocked_averages+0xa8/0x180
> >  newidle_balance+0x175/0x380
> >  pick_next_task_fair+0x39/0x3e0
> >  pick_next_task+0x4c/0xbd0
> >  ? dequeue_task_fair+0xba/0x390
> >  __schedule+0x13a/0x570
> >  schedule+0x44/0xa0
> >  worker_thread+0xc0/0x320
> >  ? process_one_work+0x390/0x390
> >  kthread+0x10f/0x130
> >  ? set_kthread_struct+0x40/0x40
> >  ret_from_fork+0x22/0x30