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From: Jens Wiklander <jens.wiklander@linaro.org>
To: Tyler Hicks <tyhicks@linux.microsoft.com>
Cc: "Allen Pais" <apais@linux.microsoft.com>,
	"Sumit Garg" <sumit.garg@linaro.org>,
	"Peter Huewe" <peterhuewe@gmx.de>,
	"Jarkko Sakkinen" <jarkko@kernel.org>,
	"Jason Gunthorpe" <jgg@ziepe.ca>,
	"Vikas Gupta" <vikas.gupta@broadcom.com>,
	"Thirupathaiah Annapureddy" <thiruan@microsoft.com>,
	"Pavel Tatashin" <pasha.tatashin@soleen.com>,
	"Rafał Miłecki" <zajec5@gmail.com>,
	"OP-TEE TrustedFirmware" <op-tee@lists.trustedfirmware.org>,
	linux-integrity <linux-integrity@vger.kernel.org>,
	bcm-kernel-feedback-list@broadcom.com,
	linux-mips@vger.kernel.org,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v4 2/8] optee: Refuse to load the driver under the kdump kernel
Date: Fri, 11 Jun 2021 11:08:48 +0200	[thread overview]
Message-ID: <CAHUa44Hh2Q06zu0TwvCejcc_0cqXeTVNA8fyt=1VH9uT7++1vg@mail.gmail.com> (raw)
In-Reply-To: <20210610210913.536081-3-tyhicks@linux.microsoft.com>

On Thu, Jun 10, 2021 at 11:09 PM Tyler Hicks
<tyhicks@linux.microsoft.com> wrote:
>
> Fix a hung task issue, seen when booting the kdump kernel, that is
> caused by all of the secure world threads being in a permanent suspended
> state:
>
>  INFO: task swapper/0:1 blocked for more than 120 seconds.
>        Not tainted 5.4.83 #1
>  "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>  swapper/0       D    0     1      0 0x00000028
>  Call trace:
>   __switch_to+0xc8/0x118
>   __schedule+0x2e0/0x700
>   schedule+0x38/0xb8
>   schedule_timeout+0x258/0x388
>   wait_for_completion+0x16c/0x4b8
>   optee_cq_wait_for_completion+0x28/0xa8
>   optee_disable_shm_cache+0xb8/0xf8
>   optee_probe+0x560/0x61c
>   platform_drv_probe+0x58/0xa8
>   really_probe+0xe0/0x338
>   driver_probe_device+0x5c/0xf0
>   device_driver_attach+0x74/0x80
>   __driver_attach+0x64/0xe0
>   bus_for_each_dev+0x84/0xd8
>   driver_attach+0x30/0x40
>   bus_add_driver+0x188/0x1e8
>   driver_register+0x64/0x110
>   __platform_driver_register+0x54/0x60
>   optee_driver_init+0x20/0x28
>   do_one_initcall+0x54/0x24c
>   kernel_init_freeable+0x1e8/0x2c0
>   kernel_init+0x18/0x118
>   ret_from_fork+0x10/0x18
>
> The invoke_fn hook returned OPTEE_SMC_RETURN_ETHREAD_LIMIT, indicating
> that the secure world threads were all in a suspended state at the time
> of the kernel crash. This intermittently prevented the kdump kernel from
> booting, resulting in a failure to collect the kernel dump.
>
> Make kernel dump collection more reliable on systems utilizing OP-TEE by
> refusing to load the driver under the kdump kernel.
>
> Signed-off-by: Tyler Hicks <tyhicks@linux.microsoft.com>
> ---
>  drivers/tee/optee/core.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)

Looks good
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

  reply	other threads:[~2021-06-11  9:10 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-10 21:09 [PATCH v4 0/8] tee: Improve support for kexec and kdump Tyler Hicks
2021-06-10 21:09 ` [PATCH v4 1/8] optee: Fix memory leak when failing to register shm pages Tyler Hicks
2021-06-11  9:05   ` Jens Wiklander
2021-06-10 21:09 ` [PATCH v4 2/8] optee: Refuse to load the driver under the kdump kernel Tyler Hicks
2021-06-11  9:08   ` Jens Wiklander [this message]
2021-06-10 21:09 ` [PATCH v4 3/8] optee: fix tee out of memory failure seen during kexec reboot Tyler Hicks
2021-06-11  9:11   ` Jens Wiklander
2021-06-11 12:53     ` Tyler Hicks
2021-06-14  7:21       ` Jens Wiklander
2021-06-14  7:22   ` Jens Wiklander
2021-06-10 21:09 ` [PATCH v4 4/8] optee: Clear stale cache entries during initialization Tyler Hicks
2021-06-14  8:27   ` Jens Wiklander
2021-06-14 19:06     ` Tyler Hicks
2021-06-14 19:15       ` Jens Wiklander
2021-06-10 21:09 ` [PATCH v4 5/8] tee: add tee_shm_alloc_kernel_buf() Tyler Hicks
2021-06-10 21:09 ` [PATCH v4 6/8] tee: Support kernel shm registration without dma-buf backing Tyler Hicks
2021-06-11  5:16   ` Sumit Garg
2021-06-11 13:09     ` Tyler Hicks
2021-06-11 13:16       ` Tyler Hicks
2021-06-12  8:19         ` Sumit Garg
2021-06-13  8:16           ` Tyler Hicks
2021-06-14  4:59             ` Sumit Garg
2021-06-10 21:09 ` [PATCH v4 7/8] tpm_ftpm_tee: Free and unregister TEE shared memory during kexec Tyler Hicks
2021-06-15 13:04   ` Jarkko Sakkinen
2021-06-10 21:09 ` [PATCH v4 8/8] firmware: tee_bnxt: Release TEE shm, session, and context " Tyler Hicks

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