linux-kernel - Re: WARNING: at drivers/opp/core.c:678 dev_pm_opp_set_rate+0x4cc/0x5d4

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Date:   Thu, 15 Oct 2020 15:26:43 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        open list <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        lkft-triage@...ts.linaro.org,
        Stephan Gerhold <stephan@...hold.net>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Krzysztof Kozlowski <krzk@...nel.org>, sbhanu@...eaurora.org,
        Sibi Sankar <sibis@...eaurora.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Stephen Boyd <sboyd@...nel.org>, nm@...com
Subject: Re: WARNING: at drivers/opp/core.c:678 dev_pm_opp_set_rate+0x4cc/0x5d4
 - on arm x15

On Mon, 31 Aug 2020 at 11:32, Viresh Kumar <viresh.kumar@...aro.org> wrote:
>
> On 31-08-20, 11:30, Naresh Kamboju wrote:
> > On Mon, 31 Aug 2020 at 10:11, Viresh Kumar <viresh.kumar@...aro.org> wrote:
> > >
> > > On 28-08-20, 15:42, Naresh Kamboju wrote:
> > > > Viresh,
> > > > I have applied the v2 patch series on top of linux next-20200824.
> > > > and tested again the reported kernel warning is fixed [1]
> > > >
> > > > [1] https://lkft.validation.linaro.org/scheduler/job/1717615#L1881
> > >
> > > Hi Naresh,
> > >
> > > You meant this one ?
> > >
> > > [PATCH V2 4/8] mmc: sdhci-msm: Unconditionally call dev_pm_opp_of_remove_table()
> >
> > I have not tested individual patches instead applied all v2 of 8 patches
> > and tested.
>
> Ah okay, Thanks. That's the same.
>
> To be honest, I wasn't targeting fixing this bug with that version,
> but it went well after all :)

The arm x15 boot failed on Linus 's mainline version 5.9.0.
I have listed the latest commits on drivers/opp/ .

metadata:
  git branch: master
  git repo: https://gitlab.com/Linaro/lkft/mirrors/torvalds/linux-mainline
  git commit: 3e4fb4346c781068610d03c12b16c0cfb0fd24a3
  git describe: v5.9-4105-g3e4fb4346c78
  make_kernelversion: 5.9.0
  kernel-config:
https://builds.tuxbuild.com/2BB2g61t29VaadVLXEl4cQ/kernel.config


------------[ cut here ]------------
[   13.530971] sdhci-omap 4809c000.mmc: Got CD GPIO
[   13.535647] WARNING: CPU: 0 PID: 137 at drivers/opp/core.c:678
dev_pm_opp_set_rate+0x4cc/0x5d4
[   13.540752] sdhci-omap 4809c000.mmc: supply vqmmc not found, using
dummy regulator
[   13.548931] Modules linked in:
[   13.559638] CPU: 0 PID: 137 Comm: kworker/0:2 Not tainted 5.9.0 #1
[   13.565848] Hardware name: Generic DRA74X (Flattened Device Tree)
[   13.571982] Workqueue: events dbs_work_handler
[   13.576453] Backtrace:
[   13.578924] [<c11e8338>] (dump_backtrace) from [<c11e86e4>]
(show_stack+0x20/0x24)
[   13.583819] mmc1: SDHCI controller on 480b4000.mmc [480b4000.mmc] using ADMA
[   13.586532]  r7:c1df7f60 r6:60000013 r5:00000000 r4:c1df7f60
[   13.599290] [<c11e86c4>] (show_stack) from [<c11ee004>]
(dump_stack+0xe4/0x104)
[   13.606640] [<c11edf20>] (dump_stack) from [<c034f384>] (__warn+0xe0/0x104)
[   13.613638]  r10:ed33b880 r9:00000009 r8:c0f3f4f4 r7:000002a6
r6:c0f3f4f4 r5:00000009
[   13.621502]  r4:c1a3546c r3:00000000
[   13.625097] [<c034f2a4>] (__warn) from [<c11e9950>]
(warn_slowpath_fmt+0x74/0xc4)
[   13.632616]  r7:000002a6 r6:c1a3546c r5:00000000 r4:ee6c2000
[   13.638305] [<c11e98e0>] (warn_slowpath_fmt) from [<c0f3f4f4>]
(dev_pm_opp_set_rate+0x4cc/0x5d4)
[   13.647132]  r9:ed33b500 r8:ee6c2000 r7:ffffffea r6:3b9aca00
r5:59682f00 r4:ed328600
[   13.654916] [<c0f3f028>] (dev_pm_opp_set_rate) from [<c0f4ac98>]
(set_target+0x38/0x3c)
[   13.662958]  r10:00000002 r9:00000000 r8:c1fc11d4 r7:c1f550c0
r6:ee6c2000 r5:00000000
[   13.670821]  r4:ed328a00
[   13.673370] [<c0f4ac60>] (set_target) from [<c0f45c54>]
(__cpufreq_driver_target+0x214/0x658)
[   13.681938] [<c0f45a40>] (__cpufreq_driver_target) from
[<c0f49208>] (od_dbs_update+0x14c/0x170)
[   13.690764]  r10:c1f2f1c0 r9:ed33bb00 r8:ed33ba80 r7:ed33f740
r6:ed33bb00 r5:ed33ba80
[   13.698631]  r4:ed328a00
[   13.701181] [<c0f490bc>] (od_dbs_update) from [<c0f49f6c>]
(dbs_work_handler+0x3c/0x68)
[   13.709224]  r9:00000000 r8:c1f03ee8 r7:ed328a00 r6:ed33ba84
r5:00000000 r4:ed33bab8
[   13.717012] [<c0f49f30>] (dbs_work_handler) from [<c036d7e8>]
(process_one_work+0x200/0x568)
[   13.725489]  r9:00000000 r8:00000000 r7:eeb32600 r6:eeb2f300
r5:ee69fd00 r4:ed33bab8
[   13.733274] [<c036d5e8>] (process_one_work) from [<c036db9c>]
(worker_thread+0x4c/0x57c)
[   13.741405]  r10:eeb2f300 r9:00000008 r8:c1d03d00 r7:eeb2f318
r6:ee69fd14 r5:eeb2f300
[   13.749267]  r4:ee69fd00
[   13.751819] [<c036db50>] (worker_thread) from [<c0375550>]
(kthread+0x144/0x170)
[   13.759252]  r10:ee17be7c r9:ee69fd00 r8:c036db50 r7:ee6c2000
r6:00000000 r5:ee6ab1c0
[   13.767116]  r4:ee1c55c0
[   13.769667] [<c037540c>] (kthread) from [<c0300174>]
(ret_from_fork+0x14/0x20)
[   13.776922] Exception stack(0xee6c3fb0 to 0xee6c3ff8)
[   13.781997] 3fa0:                                     00000000
00000000 00000000 00000000
[   13.790216] 3fc0: 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
[   13.798433] 3fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[   13.805079]  r10:00000000 r9:00000000 r8:00000000 r7:00000000
r6:00000000 r5:c037540c
[   13.812945]  r4:ee6ab1c0
[   13.815566] ---[ end trace 3876693f0f796f8e ]---
[   13.820213] cpu cpu0: multiple regulators are not supported
[   13.825836] cpufreq: __target_index: Failed to change cpu frequency: -22
<>
[   15.409753] ---[ end trace 3876693f0f796f94 ]---
[   15.414449] cpu cpu0: multiple regulators are not supported
[   15.414469] usb 2-1: new SuperSpeed Gen 1 USB device number 2 using xhci-hcd
[   15.420054] cpufreq: __target_index: Failed to change cpu frequ#


$ git  log  --oneline drivers/opp/
757e282188f0 Merge branch 'opp/linux-next' of
git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm
a5663c9b1e31 opp: Allow opp-level to be set to 0
cb60e9602cce opp: Prevent memory leak in dev_pm_opp_attach_genpd()
0ff25c99042a opp: Allow opp-supported-hw to contain multiple versions
2c59138c22f1 opp: Set required OPPs in reverse order when scaling down
60cdeae0d627 opp: Reduce code duplication in _set_required_opps()
475ac8ead803 opp: Drop unnecessary check from dev_pm_opp_attach_genpd()
3a5578784d1e Merge branch 'opp/defer-probe' into HEAD
90d46d71cce2 opp: Handle multiple calls for same OPP table in
_of_add_opp_table_v1()
763700f5e0fc Merge branch 'opp/fixes' of
git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm
922ff0759a16 opp: Don't drop reference for an OPP table that was never parsed
dd461cd9183f opp: Allow dev_pm_opp_get_opp_table() to return -EPROBE_DEFER
8aaf6264fc7f opp: Remove _dev_pm_opp_find_and_remove_table() wrapper
f3364e17d571 opp: Split out _opp_set_rate_zero()
10b217365b94 opp: Reuse the enabled flag in !target_freq path
72f80ce4ef9b opp: Rename regulator_enabled and use it as status of all resources
a4501bac0e55 opp: Enable resources again if they were disabled earlier
d4ec88d20558 opp: Put opp table in dev_pm_opp_set_rate() if _set_opp_bw() fails
8979ef70850e opp: Put opp table in dev_pm_opp_set_rate() for empty tables


link,
https://pastebin.com/9kDPEFLU
https://qa-reports.linaro.org/lkft/linux-mainline-master-sanity/build/v5.9-4105-g3e4fb4346c78/testrun/3308561/suite/linux-log-parser/tests/


- Naresh