Following kernel warning notices on qemu-arm64, qemu-arm and also on devices
running Linux version v6.2.0 while running libgpiod tests.
+ ./gpiod.sh /opt/libgpiod/bin/
[INFO] libgpiod test suite
[INFO] 117 tests registered
[INFO] checking the linux kernel version
[INFO] kernel release is v6.2.0 - ok to run tests
[INFO] using gpio-tools from '/usr/bin'
[ 10.499036] ------------[ cut here ]------------
[ 10.499656] refcount_t: underflow; use-after-free.
[ 10.500264] WARNING: CPU: 2 PID: 291 at lib/refcount.c:28
refcount_warn_saturate+0xf4/0x144
[ 10.501306] Modules linked in: gpio_mockup(-) cfg80211 bluetooth
rfkill crct10dif_ce fuse drm
[ 10.502364] CPU: 2 PID: 291 Comm: gpiod-test Not tainted 6.2.0 #1
[ 10.503229] Hardware name: linux,dummy-virt (DT)
[ 10.503883] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 10.505331] pc : refcount_warn_saturate+0xf4/0x144
[ 10.505723] lr : refcount_warn_saturate+0xf4/0x144
[ 10.506115] sp : ffff800008983cd0
[ 10.506391] x29: ffff800008983cd0 x28: ffff0000c4c4c100 x27: 0000000000000000
[ 10.506961] x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000
[ 10.507533] x23: 0000000000000200 x22: ffff0000c4e66800 x21: ffff0000c7734640
[ 10.508104] x20: 0000000000000001 x19: ffff0000c7734600 x18: ffffffffffffffff
[ 10.508677] x17: 3d4d455453595342 x16: ffffcf0234432020 x15: ffff800088983957
[ 10.509424] x14: 0000000000000000 x13: 2e656572662d7265 x12: 7466612d65737520
[ 10.510003] x11: 3b776f6c66726564 x10: ffffcf02365db580 x9 : ffffcf0233b20138
[ 10.510575] x8 : 00000000ffffefff x7 : ffffcf02365db580 x6 : 0000000000000001
[ 10.511145] x5 : ffffcf023655f000 x4 : ffffcf023655f2e8 x3 : 0000000000000000
[ 10.511721] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff0000c4c4c100
[ 10.512294] Call trace:
[ 10.512494] refcount_warn_saturate+0xf4/0x144
[ 10.512971] kobject_put+0x164/0x220
[ 10.513224] fwnode_remove_software_node+0x44/0x60
[ 10.513554] gpio_mockup_unregister_pdevs+0x54/0x70 [gpio_mockup]
[ 10.513970] gpio_mockup_exit+0x10/0x328 [gpio_mockup]
[ 10.514322] __arm64_sys_delete_module+0x190/0x2a0
[ 10.514653] invoke_syscall+0x50/0x120
[ 10.514915] el0_svc_common.constprop.0+0x104/0x124
[ 10.515277] do_el0_svc+0x44/0xcc
[ 10.515541] el0_svc+0x30/0x94
[ 10.515788] el0t_64_sync_handler+0xbc/0x13c
[ 10.516126] el0t_64_sync+0x190/0x194
[ 10.516419] ---[ end trace 0000000000000000 ]---
Build and test logs,
https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v6.2/testrun/14856342/suite/libgpiod/test/ctxless-get-value-single-line/log
https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v6.2/testrun/14856342/suite/libgpiod/tests/
--
Linaro LKFT
https://lkft.linaro.org
On Mon, Feb 20, 2023 at 08:29:27PM +0530, Naresh Kamboju wrote:
> Following kernel warning notices on qemu-arm64, qemu-arm and also on devices
> running Linux version v6.2.0 while running libgpiod tests.
>
> + ./gpiod.sh /opt/libgpiod/bin/
> [INFO] libgpiod test suite
> [INFO] 117 tests registered
> [INFO] checking the linux kernel version
> [INFO] kernel release is v6.2.0 - ok to run tests
> [INFO] using gpio-tools from '/usr/bin'
> [ 10.499036] ------------[ cut here ]------------
> [ 10.499656] refcount_t: underflow; use-after-free.
> [ 10.500264] WARNING: CPU: 2 PID: 291 at lib/refcount.c:28
> refcount_warn_saturate+0xf4/0x144
> [ 10.501306] Modules linked in: gpio_mockup(-) cfg80211 bluetooth
> rfkill crct10dif_ce fuse drm
> [ 10.502364] CPU: 2 PID: 291 Comm: gpiod-test Not tainted 6.2.0 #1
> [ 10.503229] Hardware name: linux,dummy-virt (DT)
> [ 10.503883] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> [ 10.505331] pc : refcount_warn_saturate+0xf4/0x144
> [ 10.505723] lr : refcount_warn_saturate+0xf4/0x144
> [ 10.506115] sp : ffff800008983cd0
> [ 10.506391] x29: ffff800008983cd0 x28: ffff0000c4c4c100 x27: 0000000000000000
> [ 10.506961] x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000
> [ 10.507533] x23: 0000000000000200 x22: ffff0000c4e66800 x21: ffff0000c7734640
> [ 10.508104] x20: 0000000000000001 x19: ffff0000c7734600 x18: ffffffffffffffff
> [ 10.508677] x17: 3d4d455453595342 x16: ffffcf0234432020 x15: ffff800088983957
> [ 10.509424] x14: 0000000000000000 x13: 2e656572662d7265 x12: 7466612d65737520
> [ 10.510003] x11: 3b776f6c66726564 x10: ffffcf02365db580 x9 : ffffcf0233b20138
> [ 10.510575] x8 : 00000000ffffefff x7 : ffffcf02365db580 x6 : 0000000000000001
> [ 10.511145] x5 : ffffcf023655f000 x4 : ffffcf023655f2e8 x3 : 0000000000000000
> [ 10.511721] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff0000c4c4c100
> [ 10.512294] Call trace:
> [ 10.512494] refcount_warn_saturate+0xf4/0x144
> [ 10.512971] kobject_put+0x164/0x220
> [ 10.513224] fwnode_remove_software_node+0x44/0x60
> [ 10.513554] gpio_mockup_unregister_pdevs+0x54/0x70 [gpio_mockup]
> [ 10.513970] gpio_mockup_exit+0x10/0x328 [gpio_mockup]
> [ 10.514322] __arm64_sys_delete_module+0x190/0x2a0
> [ 10.514653] invoke_syscall+0x50/0x120
> [ 10.514915] el0_svc_common.constprop.0+0x104/0x124
> [ 10.515277] do_el0_svc+0x44/0xcc
> [ 10.515541] el0_svc+0x30/0x94
> [ 10.515788] el0t_64_sync_handler+0xbc/0x13c
> [ 10.516126] el0t_64_sync+0x190/0x194
> [ 10.516419] ---[ end trace 0000000000000000 ]---
>
>
> Build and test logs,
> https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v6.2/testrun/14856342/suite/libgpiod/test/ctxless-get-value-single-line/log
> https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v6.2/testrun/14856342/suite/libgpiod/tests/
Can you give a try of the patch below?
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 77510e4f47de..1807678f032b 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -557,7 +557,7 @@ static void platform_device_release(struct device *dev)
struct platform_object *pa = container_of(dev, struct platform_object,
pdev.dev);
- of_node_put(pa->pdev.dev.of_node);
+ fwnode_handle_put(dev_fwnode(&pa->pdev.dev));
kfree(pa->pdev.dev.platform_data);
kfree(pa->pdev.mfd_cell);
kfree(pa->pdev.resource);
@@ -814,8 +814,7 @@ struct platform_device *platform_device_register_full(
return ERR_PTR(-ENOMEM);
pdev->dev.parent = pdevinfo->parent;
- pdev->dev.fwnode = pdevinfo->fwnode;
- pdev->dev.of_node = of_node_get(to_of_node(pdev->dev.fwnode));
+ device_set_node(&pdev->dev, fwnode_handle_get(pdevinfo->fwnode));
pdev->dev.of_node_reused = pdevinfo->of_node_reused;
if (pdevinfo->dma_mask) {
@@ -844,8 +843,8 @@ struct platform_device *platform_device_register_full(
ret = platform_device_add(pdev);
if (ret) {
err:
- ACPI_COMPANION_SET(&pdev->dev, NULL);
platform_device_put(pdev);
+ fwnode_handle_put(pdevinfo->fwnode);
return ERR_PTR(ret);
}
--
With Best Regards,
Andy Shevchenko
On Tue, Feb 21, 2023 at 07:13:31PM +0200, Andy Shevchenko wrote:
> On Mon, Feb 20, 2023 at 08:29:27PM +0530, Naresh Kamboju wrote:
> > Following kernel warning notices on qemu-arm64, qemu-arm and also on devices
> > running Linux version v6.2.0 while running libgpiod tests.
...
> - ACPI_COMPANION_SET(&pdev->dev, NULL);
This line should stay otherwise it will remove the device that may share
the fwnode with this newly created platform device.
--
With Best Regards,
Andy Shevchenko
On Mon, Feb 20, 2023 at 3:59 PM Naresh Kamboju
<[email protected]> wrote:
>
> Following kernel warning notices on qemu-arm64, qemu-arm and also on devices
> running Linux version v6.2.0 while running libgpiod tests.
>
I don't see it on v6.2 with libgpiod v1.6.4. Seeing the output of the
test script, it seems you're using an old version - what is it?
> + ./gpiod.sh /opt/libgpiod/bin/
What's in gpiod.sh?
Bart
> [INFO] libgpiod test suite
> [INFO] 117 tests registered
> [INFO] checking the linux kernel version
> [INFO] kernel release is v6.2.0 - ok to run tests
> [INFO] using gpio-tools from '/usr/bin'
> [ 10.499036] ------------[ cut here ]------------
> [ 10.499656] refcount_t: underflow; use-after-free.
> [ 10.500264] WARNING: CPU: 2 PID: 291 at lib/refcount.c:28
> refcount_warn_saturate+0xf4/0x144
> [ 10.501306] Modules linked in: gpio_mockup(-) cfg80211 bluetooth
> rfkill crct10dif_ce fuse drm
> [ 10.502364] CPU: 2 PID: 291 Comm: gpiod-test Not tainted 6.2.0 #1
> [ 10.503229] Hardware name: linux,dummy-virt (DT)
> [ 10.503883] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> [ 10.505331] pc : refcount_warn_saturate+0xf4/0x144
> [ 10.505723] lr : refcount_warn_saturate+0xf4/0x144
> [ 10.506115] sp : ffff800008983cd0
> [ 10.506391] x29: ffff800008983cd0 x28: ffff0000c4c4c100 x27: 0000000000000000
> [ 10.506961] x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000
> [ 10.507533] x23: 0000000000000200 x22: ffff0000c4e66800 x21: ffff0000c7734640
> [ 10.508104] x20: 0000000000000001 x19: ffff0000c7734600 x18: ffffffffffffffff
> [ 10.508677] x17: 3d4d455453595342 x16: ffffcf0234432020 x15: ffff800088983957
> [ 10.509424] x14: 0000000000000000 x13: 2e656572662d7265 x12: 7466612d65737520
> [ 10.510003] x11: 3b776f6c66726564 x10: ffffcf02365db580 x9 : ffffcf0233b20138
> [ 10.510575] x8 : 00000000ffffefff x7 : ffffcf02365db580 x6 : 0000000000000001
> [ 10.511145] x5 : ffffcf023655f000 x4 : ffffcf023655f2e8 x3 : 0000000000000000
> [ 10.511721] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff0000c4c4c100
> [ 10.512294] Call trace:
> [ 10.512494] refcount_warn_saturate+0xf4/0x144
> [ 10.512971] kobject_put+0x164/0x220
> [ 10.513224] fwnode_remove_software_node+0x44/0x60
> [ 10.513554] gpio_mockup_unregister_pdevs+0x54/0x70 [gpio_mockup]
> [ 10.513970] gpio_mockup_exit+0x10/0x328 [gpio_mockup]
> [ 10.514322] __arm64_sys_delete_module+0x190/0x2a0
> [ 10.514653] invoke_syscall+0x50/0x120
> [ 10.514915] el0_svc_common.constprop.0+0x104/0x124
> [ 10.515277] do_el0_svc+0x44/0xcc
> [ 10.515541] el0_svc+0x30/0x94
> [ 10.515788] el0t_64_sync_handler+0xbc/0x13c
> [ 10.516126] el0t_64_sync+0x190/0x194
> [ 10.516419] ---[ end trace 0000000000000000 ]---
>
>
> Build and test logs,
> https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v6.2/testrun/14856342/suite/libgpiod/test/ctxless-get-value-single-line/log
> https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v6.2/testrun/14856342/suite/libgpiod/tests/
>
>
> --
> Linaro LKFT
> https://lkft.linaro.org
On Tue, 21 Feb 2023 at 18:54, Andy Shevchenko
<[email protected]> wrote:
>
> On Tue, Feb 21, 2023 at 07:13:31PM +0200, Andy Shevchenko wrote:
> > On Mon, Feb 20, 2023 at 08:29:27PM +0530, Naresh Kamboju wrote:
> > > Following kernel warning notices on qemu-arm64, qemu-arm and also on devices
> > > running Linux version v6.2.0 while running libgpiod tests.
>
> ...
>
> > - ACPI_COMPANION_SET(&pdev->dev, NULL);
>
> This line should stay otherwise it will remove the device that may share
> the fwnode with this newly created platform device.
>
I was this issue on todays next tag: next-20230607 too, when I ran
libgpiod v1.6.4, and I
trieed to apply your proposed patch, but it didn't solve the
"refcount_t: underflow; use-after-free.".
However, understand that I shouldn't run libgpiod v1.6.4, but I did by
accident. Not sure
that I think I should get a use-after-free if I run the wrong version
of the test-suite or?
Running with libgpiod v2.0.1 I do not see this use-after-free issue.
This is how I reproduced the issue on todays next tag next-20230607, I
use tuxmake [1] to build the kernel and tuxrun [2] to run test with
the booted kernel.
$git checkout next-20230607
$ tuxmake --runtime podman --target-arch arm64 --toolchain gcc-12
--kconfig defconfig --kconfig-add
https://raw.githubusercontent.com/Linaro/meta-lkft/kirkstone/meta/recipes-kernel/linux/files/lkft.config
--kconfig-add https://raw.githubusercontent.com/Linaro/meta-lkft/kirkstone/meta/recipes-kernel/linux/files/lkft-crypto.config
--kconfig-add https://raw.githubusercontent.com/Linaro/meta-lkft/kirkstone/meta/recipes-kernel/linux/files/distro-overrides.config
--kconfig-add https://raw.githubusercontent.com/Linaro/meta-lkft/kirkstone/meta/recipes-kernel/linux/files/systemd.config
--kconfig-add https://raw.githubusercontent.com/Linaro/meta-lkft/kirkstone/meta/recipes-kernel/linux/files/virtio.config
--kconfig-add CONFIG_ARM64_MODULE_PLTS=y --kconfig-add
CONFIG_SYN_COOKIES=y --kconfig-add CONFIG_SCHEDSTATS=y --kconfig-add
CONFIG_GPIOLIB=y --kconfig-add CONFIG_GPIO_CDEV=y --kconfig-add
CONFIG_GPIO_MOCKUP=m --kconfig-add CONFIG_GPIO_SIM=m --results-hook
'tuxrun --runtime podman --device qemu-arm64 --boot-args rw --tuxmake
./ --rootfs https://storage.tuxboot.com/debian/bookworm/arm64/rootfs.ext4.xz
--parameters SKIPFILE=skipfile-lkft.yaml --tests libgpiod --timeouts
boot=30 --overlay
https://storage.dev.tuxboot.com/overlays/debian/bookworm/arm64/libgpiod/v1.6.4/libgpiod.tar.xz
--save-output --log-file -'
Cheers,
Anders
[1] https://tuxmake.org/
[2] https://tuxrun.org/
On Wed, 22 Feb 2023 at 13:36, Bartosz Golaszewski <[email protected]> wrote:
>
> On Mon, Feb 20, 2023 at 3:59 PM Naresh Kamboju
> <[email protected]> wrote:
> >
> > Following kernel warning notices on qemu-arm64, qemu-arm and also on devices
> > running Linux version v6.2.0 while running libgpiod tests.
> >
>
> I don't see it on v6.2 with libgpiod v1.6.4. Seeing the output of the
> test script, it seems you're using an old version - what is it?
Yes, I did run libgpiod v1.6.4 by mistake on todays next-20230607 tag.
Not sure if I should or should not get the use-after-free warning by
running the "wrong version"
of a test suite or?
>
> > + ./gpiod.sh /opt/libgpiod/bin/
>
> What's in gpiod.sh?
its a wrapper script around gpiod-test [1] to parse the output to be
understood by our test framework
Cheers,
Anders
[1] https://github.com/Linaro/test-definitions/blob/master/automated/linux/gpiod/gpiod.sh
>
> Bart
>
> > [INFO] libgpiod test suite
> > [INFO] 117 tests registered
> > [INFO] checking the linux kernel version
> > [INFO] kernel release is v6.2.0 - ok to run tests
> > [INFO] using gpio-tools from '/usr/bin'
> > [ 10.499036] ------------[ cut here ]------------
> > [ 10.499656] refcount_t: underflow; use-after-free.
> > [ 10.500264] WARNING: CPU: 2 PID: 291 at lib/refcount.c:28
> > refcount_warn_saturate+0xf4/0x144
> > [ 10.501306] Modules linked in: gpio_mockup(-) cfg80211 bluetooth
> > rfkill crct10dif_ce fuse drm
> > [ 10.502364] CPU: 2 PID: 291 Comm: gpiod-test Not tainted 6.2.0 #1
> > [ 10.503229] Hardware name: linux,dummy-virt (DT)
> > [ 10.503883] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> > [ 10.505331] pc : refcount_warn_saturate+0xf4/0x144
> > [ 10.505723] lr : refcount_warn_saturate+0xf4/0x144
> > [ 10.506115] sp : ffff800008983cd0
> > [ 10.506391] x29: ffff800008983cd0 x28: ffff0000c4c4c100 x27: 0000000000000000
> > [ 10.506961] x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000
> > [ 10.507533] x23: 0000000000000200 x22: ffff0000c4e66800 x21: ffff0000c7734640
> > [ 10.508104] x20: 0000000000000001 x19: ffff0000c7734600 x18: ffffffffffffffff
> > [ 10.508677] x17: 3d4d455453595342 x16: ffffcf0234432020 x15: ffff800088983957
> > [ 10.509424] x14: 0000000000000000 x13: 2e656572662d7265 x12: 7466612d65737520
> > [ 10.510003] x11: 3b776f6c66726564 x10: ffffcf02365db580 x9 : ffffcf0233b20138
> > [ 10.510575] x8 : 00000000ffffefff x7 : ffffcf02365db580 x6 : 0000000000000001
> > [ 10.511145] x5 : ffffcf023655f000 x4 : ffffcf023655f2e8 x3 : 0000000000000000
> > [ 10.511721] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff0000c4c4c100
> > [ 10.512294] Call trace:
> > [ 10.512494] refcount_warn_saturate+0xf4/0x144
> > [ 10.512971] kobject_put+0x164/0x220
> > [ 10.513224] fwnode_remove_software_node+0x44/0x60
> > [ 10.513554] gpio_mockup_unregister_pdevs+0x54/0x70 [gpio_mockup]
> > [ 10.513970] gpio_mockup_exit+0x10/0x328 [gpio_mockup]
> > [ 10.514322] __arm64_sys_delete_module+0x190/0x2a0
> > [ 10.514653] invoke_syscall+0x50/0x120
> > [ 10.514915] el0_svc_common.constprop.0+0x104/0x124
> > [ 10.515277] do_el0_svc+0x44/0xcc
> > [ 10.515541] el0_svc+0x30/0x94
> > [ 10.515788] el0t_64_sync_handler+0xbc/0x13c
> > [ 10.516126] el0t_64_sync+0x190/0x194
> > [ 10.516419] ---[ end trace 0000000000000000 ]---
> >
> >
> > Build and test logs,
> > https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v6.2/testrun/14856342/suite/libgpiod/test/ctxless-get-value-single-line/log
> > https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v6.2/testrun/14856342/suite/libgpiod/tests/
> >
> >
> > --
> > Linaro LKFT
> > https://lkft.linaro.org
On Wed, Jun 7, 2023 at 8:35 PM Anders Roxell <[email protected]> wrote:
>
> On Wed, 22 Feb 2023 at 13:36, Bartosz Golaszewski <[email protected]> wrote:
> >
> > On Mon, Feb 20, 2023 at 3:59 PM Naresh Kamboju
> > <[email protected]> wrote:
> > >
> > > Following kernel warning notices on qemu-arm64, qemu-arm and also on devices
> > > running Linux version v6.2.0 while running libgpiod tests.
> > >
> >
> > I don't see it on v6.2 with libgpiod v1.6.4. Seeing the output of the
> > test script, it seems you're using an old version - what is it?
>
> Yes, I did run libgpiod v1.6.4 by mistake on todays next-20230607 tag.
> Not sure if I should or should not get the use-after-free warning by
> running the "wrong version"
> of a test suite or?
>
It doesn't matter, v1.6.4 is still supported. I'll give it a try tomorrow.
Brt
> >
> > > + ./gpiod.sh /opt/libgpiod/bin/
> >
> > What's in gpiod.sh?
>
> its a wrapper script around gpiod-test [1] to parse the output to be
> understood by our test framework
>
> Cheers,
> Anders
> [1] https://github.com/Linaro/test-definitions/blob/master/automated/linux/gpiod/gpiod.sh
>
> >
> > Bart
> >
> > > [INFO] libgpiod test suite
> > > [INFO] 117 tests registered
> > > [INFO] checking the linux kernel version
> > > [INFO] kernel release is v6.2.0 - ok to run tests
> > > [INFO] using gpio-tools from '/usr/bin'
> > > [ 10.499036] ------------[ cut here ]------------
> > > [ 10.499656] refcount_t: underflow; use-after-free.
> > > [ 10.500264] WARNING: CPU: 2 PID: 291 at lib/refcount.c:28
> > > refcount_warn_saturate+0xf4/0x144
> > > [ 10.501306] Modules linked in: gpio_mockup(-) cfg80211 bluetooth
> > > rfkill crct10dif_ce fuse drm
> > > [ 10.502364] CPU: 2 PID: 291 Comm: gpiod-test Not tainted 6.2.0 #1
> > > [ 10.503229] Hardware name: linux,dummy-virt (DT)
> > > [ 10.503883] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> > > [ 10.505331] pc : refcount_warn_saturate+0xf4/0x144
> > > [ 10.505723] lr : refcount_warn_saturate+0xf4/0x144
> > > [ 10.506115] sp : ffff800008983cd0
> > > [ 10.506391] x29: ffff800008983cd0 x28: ffff0000c4c4c100 x27: 0000000000000000
> > > [ 10.506961] x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000
> > > [ 10.507533] x23: 0000000000000200 x22: ffff0000c4e66800 x21: ffff0000c7734640
> > > [ 10.508104] x20: 0000000000000001 x19: ffff0000c7734600 x18: ffffffffffffffff
> > > [ 10.508677] x17: 3d4d455453595342 x16: ffffcf0234432020 x15: ffff800088983957
> > > [ 10.509424] x14: 0000000000000000 x13: 2e656572662d7265 x12: 7466612d65737520
> > > [ 10.510003] x11: 3b776f6c66726564 x10: ffffcf02365db580 x9 : ffffcf0233b20138
> > > [ 10.510575] x8 : 00000000ffffefff x7 : ffffcf02365db580 x6 : 0000000000000001
> > > [ 10.511145] x5 : ffffcf023655f000 x4 : ffffcf023655f2e8 x3 : 0000000000000000
> > > [ 10.511721] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff0000c4c4c100
> > > [ 10.512294] Call trace:
> > > [ 10.512494] refcount_warn_saturate+0xf4/0x144
> > > [ 10.512971] kobject_put+0x164/0x220
> > > [ 10.513224] fwnode_remove_software_node+0x44/0x60
> > > [ 10.513554] gpio_mockup_unregister_pdevs+0x54/0x70 [gpio_mockup]
> > > [ 10.513970] gpio_mockup_exit+0x10/0x328 [gpio_mockup]
> > > [ 10.514322] __arm64_sys_delete_module+0x190/0x2a0
> > > [ 10.514653] invoke_syscall+0x50/0x120
> > > [ 10.514915] el0_svc_common.constprop.0+0x104/0x124
> > > [ 10.515277] do_el0_svc+0x44/0xcc
> > > [ 10.515541] el0_svc+0x30/0x94
> > > [ 10.515788] el0t_64_sync_handler+0xbc/0x13c
> > > [ 10.516126] el0t_64_sync+0x190/0x194
> > > [ 10.516419] ---[ end trace 0000000000000000 ]---
> > >
> > >
> > > Build and test logs,
> > > https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v6.2/testrun/14856342/suite/libgpiod/test/ctxless-get-value-single-line/log
> > > https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v6.2/testrun/14856342/suite/libgpiod/tests/
> > >
> > >
> > > --
> > > Linaro LKFT
> > > https://lkft.linaro.org