[Buildroot] [PATCH] support/testing: test_lxc: bump kernel version to 5.15.38 for complete pidfds support

[Peter Korsgaard]

>>>>> "Romain" == Romain Naour <romain.naour at gmail.com> writes:

 > As reported by [1], the lxc test is broken since lxc >= 4.0.11.
 > A patch was added to lxc 4.0.11 to use the new mount api for devpts
 > setup [2] but the fall back code doesn't work when this new mount
 > API is not supported. This API was added in kernel 5.6.

 > (kernel 5.5)
 > DEBUG conf - conf.c:lxc_setup_devpts_child:1682 - No new devpts instance will be
 > mounted since no pts devices are required
 > lxc-start lxc_iperf3  DEBUG conf - conf.c:lxc_setup_dev_console:1966 - Cleared
 > all (0) mounts from "/dev/console"
 > lxc-start lxc_iperf3  ERROR mount_utils - mount_utils.c:mount_at:661 - No such
 > file or directory - Failed to mount "/proc/self/fd/44" to "/proc/self/fd/43"
 > lxc-start lxc_iperf3  ERROR conf - conf.c:lxc_setup_dev_console:1988 - No such
 > file or directory - Failed to mount "10(/dev/pts/0)" on "43"
 > lxc-start lxc_iperf3  ERROR conf - conf.c:lxc_setup_console:2143 - No such file
 > or directory - Failed to setup console

 > (kernel 5.6)
 > lxc-start lxc_iperf3  TRACE mount_utils - mount_utils.c:can_use_mount_api:582 -
 > Kernel supports mount api
 > lxc-start lxc_iperf3  TRACE mount_utils - mount_utils.c:move_detached_mount:328
 > - Attach detached mount 45 to filesystem at 43
 > lxc-start lxc_iperf3  TRACE conf - conf.c:lxc_setup_dev_console:1990 - Setup
 > console "/dev/pts/0"

 > Bump the kernel to the current LTS 5.15.38 version that fully support the
 > mount API needed by lxc.

 > Fixes:
 > https://gitlab.com/buildroot.org/buildroot/-/jobs/2429013708

 > [1] http://lists.busybox.net/pipermail/buildroot/2022-January/635251.html
 > [2] https://github.com/lxc/lxc/commit/be606e16fd0fa967219d890745a425625eafe251

 > Signed-off-by: Romain Naour <romain.naour at gmail.com>
 > Cc: Fabrice Fontaine <fontaine.fabrice at gmail.com>

Committed to 2022.02.x, thanks.

-- 
Bye, Peter Korsgaard