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Tejun Heo Cc: Johannes Weiner , "spasswolf@web.de Michal" =?ISO-8859-1?Q?Koutn=FD?= , Sebastian Andrzej Siewior , Petr Malat , kernel test robot , Martin Pitt , cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, Aishwarya.TCV@arm.com Date: Sun, 31 May 2026 11:19:30 +0200 In-Reply-To: References: <20260505005121.1230198-1-tj@kernel.org> <20260505005121.1230198-6-tj@kernel.org> <41cd159c-54e5-45e0-81df-eaf36a6c028e@sirena.org.uk> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.56.2-9 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:PJpERjCmYp7QAntkte6DQ8j+G3H5J88WPns8jX4HLS+/K469IRT ipFppwsqcYoafYaixsckeuh9JoqgzWEH9wxmOqD2k3KfneBwLt6GlFH5OLF3qPRSDjFrABG u6JQT/SBiBPbVsOpkFJF/guc8PHJkO6UD+UA2Iglm8INFTMROHULfADewCvTe/dbxlIXo2g 4nWMrc7gsgqHtmPijXn8g== X-Spam-Flag: NO UI-OutboundReport: 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WIFu19Iz5vbcrVl+rI6zFXfEFXBCktRBMXF/nSPeKFrsXTT3 Am Freitag, dem 29.05.2026 um 22:08 +0100 schrieb Mark Brown: > On Fri, May 29, 2026 at 07:25:29AM -1000, Tejun Heo wrote: > > On Wed, May 27, 2026 at 11:45:54AM +0100, Mark Brown wrote: > > > On Mon, May 04, 2026 at 02:51:21PM -1000, Tejun Heo wrote: >=20 > > > with no further output and given that this is a cgroup locking chang= e > > > this does seem like a plausible commmit, though I didn't look into i= t in > > > detail. Bisect log and the list of LTP tests we're running in our t= est > > > job below. We are running multuple tests in parallel. >=20 > > Unfortunately, I can't reproduce this in my environment. Any chance yo= u can > > try testing on x86 tooa nd see whether it produces there? >=20 > Not readily sadly, I'll see if I can figure something out. Our rootfs > images are based on Debian Trixie if that's relevant? Using debian unstable (sid/forky) I can at least detect a timeout when run= ning the ltp controller testsuite: # LTPROOT=3D/home/bert/ltp-install/ ./kirk --run-suite controllers Host information Hostname: homer Python: 3.13.12 (main, Feb 4 2026, 15:06:39) [GCC 15.2.0] Directory: /tmp/kirk.root/tmp092in2yb Connecting to SUT: default Suite: controllers =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80 cgroup_core01: pass (0.024s) cgroup_core02: pass (0.004s) cgroup_core03: pass (0.017s) cgroup: skip (2m 41s) memcg_regression: skip (3.414s) memcg_test_3: pass (0.090s) memcg_failcnt: skip (0.019s) memcg_force_empty: skip (0.015s) memcg_limit_in_bytes: skip (0.017s) memcg_stat_rss: skip (0.015s) memcg_subgroup_charge: skip (0.015s) memcg_max_usage_in_bytes: skip (0.014s) memcg_move_charge_at_immigrate: skip (0.014s) memcg_memsw_limit_in_bytes: skip (0.015s) memcg_stat: skip (0.015s) memcg_use_hierarchy: skip (0.015s) memcg_usage_in_bytes: skip (0.014s) memcg_stress: pass (30m 4s) memcg_control: pass (6.058s) memcontrol01: pass (0.004s) memcontrol02: pass (0.636s) memcontrol03: pass (15.983s) memcontrol04: pass (0.890s) cgroup_fj_function_debug: skip (0.013s) cgroup_fj_function_cpuset: skip (0.044s) cgroup_fj_function_cpu: skip (0.050s) cgroup_fj_function_cpuacct: pass (0.052s) cgroup_fj_function_memory: skip (0.042s) cgroup_fj_function_freezer: pass (0.044s) cgroup_fj_function_devices: pass (0.066s) cgroup_fj_function_blkio: skip (0.009s) cgroup_fj_function_net_cls: pass (0.073s) cgroup_fj_function_perf_event: pass (0.072s) cgroup_fj_function_net_prio: Suite 'controllers' timed out after 3600 seco= nds Execution time: 1h 33m 13s Disconnecting from SUT: default Target information =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80 Kernel: Linux 7.1.0-rc5-next-20260528-master-dirty #480 SMP PREEMPT_RT T= hu May 28 19:55:12 CEST 2026 Cmdline: BOOT_IMAGE=3D/boot/vmlinuz-7.1.0-rc5-next-20260528-master-dirty root=3DUUID=3D3d5cdc5d-1902-40bf-9e16-ca819372d350 ro quiet Machine: unknown Arch: x86_64 RAM: 63439380 kB Swap: 78125052 kB Distro: debian=20 =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80 TEST SUMMARY =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80 Suite: controllers Runtime: 33m 13s Runs: 347 Results: Passed: 181 Failed: 0 Broken: 0 Skipped: 350 Warnings: 0 Session stopped In dmesg I get messages about task tst_cgtl hanging: [ 2212.794669] [ T346] INFO: task tst_cgctl:317896 blocked for more tha= n 122 seconds. [ 2212.794674] [ T346] Not tainted 7.1.0-rc5-next-20260528-master= -dirty #480 [ 2212.794675] [ T346] "echo 0 > /proc/sys/kernel/hung_task_timeout_sec= s" disables this message. [...]=20 [ 3318.721344] [ T346] INFO: task tst_cgctl:317896 blocked for more tha= n 1228 seconds. [ 3318.721349] [ T346] Not tainted 7.1.0-rc5-next-20260528-master= -dirty #480 [ 3318.721351] [ T346] "echo 0 > /proc/sys/kernel/hung_task_timeout_sec= s" disables this message. On 6.19.14 the Results of this testrun is: # LTPROOT=3D/home/bert/ltp-install/ ./kirk --run-suite controllers [...] Target information =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80 Kernel: Linux 6.19.14-stable #1238 SMP PREEMPT_RT Sat May 30 17:28:29 CE= ST 2026 Cmdline: BOOT_IMAGE=3D/boot/vmlinuz-6.19.14-stable root=3DUUID=3D3d5cdc5d-1902-40bf-9e16-ca819372d350 ro quiet Machine: unknown Arch: x86_64 RAM: 63436188 kB Swap: 78125052 kB Distro: debian=20 =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80 TEST SUMMARY =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80 Suite: controllers Runtime: 36m 12s Runs: 347 Results: Passed: 1742 Failed: 0 Broken: 0 Skipped: 97 Warnings: 0 Session stopped With 6.19.14 I also get no hung tasks. On 7.0.10 the tests also work: root@homer:/mnt/data/linux-forest/kirk# LTPROOT=3D/home/bert/ltp-install/ = ./kirk --run-suite controllers Host information Hostname: homer Python: 3.13.12 (main, Feb 4 2026, 15:06:39) [GCC 15.2.0] Directory: /tmp/kirk.root/tmpq32b09g7 Connecting to SUT: default Suite: controllers =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80 cgroup_core01: pass (0.016s) [...] pids_9_100: pass (0.107s) Execution time: 36m 15s Disconnecting from SUT: default Target information =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80 Kernel: Linux 7.0.10-stable #1239 SMP PREEMPT_RT Sun May 31 00:42:41 CES= T 2026 Cmdline: BOOT_IMAGE=3D/boot/vmlinuz-7.0.10-stable root=3DUUID=3D3d5cdc5d-1902-40bf-9e16-ca819372d350 ro quiet Machine: unknown Arch: x86_64 RAM: 63435940 kB Swap: 78125052 kB Distro: debian=20 =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80 TEST SUMMARY =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80 Suite: controllers Runtime: 36m 13s Runs: 347 Results: Passed: 1742 Failed: 0 Broken: 0 Skipped: 97 Warnings: 0 Session stopped I'm not sure if this is related to the problems on arm64, but I'll try bis= ecting this. Bert Karwatzki