From: Tyler Hicks <tyhicks@linux.microsoft.com>
To: Jens Wiklander <jens.wiklander@linaro.org>,
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>
Cc: "Thirupathaiah Annapureddy" <thiruan@microsoft.com>,
"Pavel Tatashin" <pasha.tatashin@soleen.com>,
"Rafał Miłecki" <zajec5@gmail.com>,
op-tee@lists.trustedfirmware.org,
linux-integrity@vger.kernel.org,
bcm-kernel-feedback-list@broadcom.com,
linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v5 2/8] optee: Refuse to load the driver under the kdump kernel
Date: Mon, 14 Jun 2021 17:33:11 -0500 [thread overview]
Message-ID: <20210614223317.999867-3-tyhicks@linux.microsoft.com> (raw)
In-Reply-To: <20210614223317.999867-1-tyhicks@linux.microsoft.com>
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.
Cc: stable@vger.kernel.org
Signed-off-by: Tyler Hicks <tyhicks@linux.microsoft.com>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
---
drivers/tee/optee/core.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
index ddb8f9ecf307..5288cd767d82 100644
--- a/drivers/tee/optee/core.c
+++ b/drivers/tee/optee/core.c
@@ -6,6 +6,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/arm-smccc.h>
+#include <linux/crash_dump.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/module.h>
@@ -612,6 +613,16 @@ static int optee_probe(struct platform_device *pdev)
u32 sec_caps;
int rc;
+ /*
+ * The kernel may have crashed at the same time that all available
+ * secure world threads were suspended and we cannot reschedule the
+ * suspended threads without access to the crashed kernel's wait_queue.
+ * Therefore, we cannot reliably initialize the OP-TEE driver in the
+ * kdump kernel.
+ */
+ if (is_kdump_kernel())
+ return -ENODEV;
+
invoke_fn = get_invoke_func(&pdev->dev);
if (IS_ERR(invoke_fn))
return PTR_ERR(invoke_fn);
--
2.25.1
next prev parent reply other threads:[~2021-06-14 22:33 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-14 22:33 [PATCH v5 0/8] tee: Improve support for kexec and kdump Tyler Hicks
2021-06-14 22:33 ` [PATCH v5 1/8] optee: Fix memory leak when failing to register shm pages Tyler Hicks
2021-06-14 22:33 ` Tyler Hicks [this message]
2021-06-14 22:33 ` [PATCH v5 3/8] optee: fix tee out of memory failure seen during kexec reboot Tyler Hicks
2021-06-14 22:33 ` [PATCH v5 4/8] optee: Clear stale cache entries during initialization Tyler Hicks
2021-06-15 7:00 ` Jens Wiklander
2021-06-14 22:33 ` [PATCH v5 5/8] tee: add tee_shm_alloc_kernel_buf() Tyler Hicks
2021-06-14 22:33 ` [PATCH v5 6/8] tee: Correct inappropriate usage of TEE_SHM_DMA_BUF flag Tyler Hicks
2021-06-15 7:10 ` Jens Wiklander
2021-06-14 22:33 ` [PATCH v5 7/8] tpm_ftpm_tee: Free and unregister TEE shared memory during kexec Tyler Hicks
2021-06-14 22:33 ` [PATCH v5 8/8] firmware: tee_bnxt: Release TEE shm, session, and context " Tyler Hicks
2021-06-15 4:32 ` [PATCH v5 0/8] tee: Improve support for kexec and kdump Sumit Garg
2021-06-15 4:34 ` Tyler Hicks
2021-06-15 7:23 ` Jens Wiklander
2021-06-15 13:37 ` Tyler Hicks
2021-06-15 14:15 ` Florian Fainelli
2021-07-21 6:03 ` Jens Wiklander
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