linux-kernel - Re: Shutdown hang on Cavium thunderX eMMC

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Message-ID: <CAPDyKFo5SLtcVWPuMOvhWFFYGEX8Q3PUvX-U_waX4TVjm=fEoA@mail.gmail.com>
Date:   Thu, 17 Feb 2022 15:42:17 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Daniel Danzberger <daniel@...wrt.com>
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        alcooperx@...il.com, adrian.hunter@...el.com
Subject: Re: Shutdown hang on Cavium thunderX eMMC

On Tue, 15 Feb 2022 at 10:52, Daniel Danzberger <daniel@...wrt.com> wrote:
>
> Hi,
>
> the below commit causes a shutodown hang on my octeontx platforms
> (aarch64) with Cavium ThunderX eMMC
>
> --
> commit 66c915d09b942fb3b2b0cb2f56562180901fba17
> Author: Ulf Hansson <ulf.hansson@...aro.org>
> Date:   Fri Dec 3 15:15:54 2021 +0100
>
>     mmc: core: Disable card detect during shutdown
> --
>
> On shutdown, the __mmc_stop_host() call blocks by waiting for
> mmc_detect() to complete, but it never does.
> The second stack trace below shows it's been waiting forever for an
> mmc_send_status() request to complete.

Looks like the root to the problem is that the mmc_send_status()
request is hanging the cavium mmc host driver.

Is that instance of the mmc host driver functional at all? I mean, it
looks like the host driver is hanging already before the system is
being shutdown, right?

Kind regards
Uffe

>
>
> [  394.251271] INFO: task procd:2715 blocked for more than 153 seconds.
> [  394.257635]       Not tainted 5.10.96 #0
> [  394.261552] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> disables this message.
> [  394.269389] task:procd           state:D stack:    0 pid: 2715 ppid:
> 1 flags:0x00000000
> [  394.277749] dump_backtrace(regs = 0000000000000000 tsk =
> 000000003cc20742)
> [  394.284625] Call trace:
> [  394.287069]  __switch_to+0x80/0xc0
> [  394.290467]  __schedule+0x1f8/0x530
> [  394.293961]  schedule+0x48/0xd0
> [  394.297099]  schedule_timeout+0x98/0xd0
> [  394.300931]  __wait_for_common+0xc4/0x1c4
> [  394.304956]  wait_for_completion+0x20/0x2c
> [  394.309050]  __flush_work.isra.0+0x184/0x31c
> [  394.313329]  __cancel_work_timer+0xfc/0x170
> [  394.317510]  cancel_delayed_work_sync+0x14/0x20
> [  394.322038]  __mmc_stop_host+0x3c/0x50
> [  394.325799]  mmc_host_classdev_shutdown+0x14/0x24
> [  394.330500]  device_shutdown+0x120/0x250
> [  394.334430]  __do_sys_reboot+0x1ec/0x290
> [  394.338350]  __arm64_sys_reboot+0x24/0x30
> [  394.342356]  do_el0_svc+0x74/0x120
> [  394.345765]  el0_svc+0x14/0x20
> [  394.348817]  el0_sync_handler+0xa4/0x140
> [  394.352736]  el0_sync+0x164/0x180
>
>
> [  735.262749] INFO: task kworker/0:0:5 blocked for more than 614
> seconds.
> [  735.269363]       Not tainted 5.10.96 #0
> [  735.273296] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> disables this message.
> [  735.281121] task:kworker/0:0     state:D stack:    0 pid:    5 ppid:
> 2 flags:0x00000028
> [  735.289490] Workqueue: events_freezable mmc_rescan
> [  735.294288] Call trace:
> [  735.296732]  __switch_to+0x80/0xc0
> [  735.300131]  __schedule+0x1f8/0x530
> [  735.303623]  schedule+0x48/0xd0
> [  735.306761]  schedule_timeout+0x98/0xd0
> [  735.310593]  __wait_for_common+0xc4/0x1c4
> [  735.314606]  wait_for_completion+0x20/0x2c
> [  735.318699]  mmc_wait_for_req_done+0x2c/0x100
> [  735.323065]  mmc_wait_for_req+0xb0/0x100
> [  735.326984]  mmc_wait_for_cmd+0x54/0x7c
> [  735.330818]  mmc_send_status+0x5c/0x80
> [  735.334573]  mmc_alive+0x18/0x24
> [  735.337798]  _mmc_detect_card_removed+0x34/0x150
> [  735.342412]  mmc_detect+0x28/0x90
> [  735.345732]  mmc_rescan+0xd8/0x348
> [  735.349132]  process_one_work+0x1d4/0x374
> [  735.353147]  worker_thread+0x17c/0x4ec
> [  735.356892]  kthread+0x124/0x12c
> [  735.360117]  ret_from_fork+0x10/0x34
>
>
>
> I only could test this with 5.10.96 for now.
>
>
> --
> Regards
>
> Daniel Danzberger
> embeDD GmbH, Alter Postplatz 2, CH-6370 Stans