* Re: [LTP] [PATCH] sched/fork: Fix timer_slack_ns inheritance for RT tasks [not found] <20260520-sched-fork-fix-timer-slack-v1-1-d4fc937245b2@xiaomi.com> @ 2026-05-28 4:50 ` kernel test robot 2026-05-28 5:24 ` K Prateek Nayak via ltp 0 siblings, 1 reply; 2+ messages in thread From: kernel test robot @ 2026-05-28 4:50 UTC (permalink / raw) To: Xiao Feng via B4 Relay Cc: Juri Lelli, Xiao Feng, Michal Hocko, Peter Zijlstra, Ben Segall, Liam R. Howlett, lkp, Valentin Schneider, Vincent Guittot, Vlastimil Babka, aubrey.li, Kees Cook, Ingo Molnar, Mel Gorman, Steven Rostedt, Felix Moessbauer, K Prateek Nayak, David Hildenbrand, Lorenzo Stoakes, Suren Baghdasaryan, Dietmar Eggemann, ltp, yu.c.chen, linux-mm, linux-kernel, oliver.sang, Thomas Gleixner, oe-lkp, Andrew Morton, Mike Rapoport Hello, kernel test robot noticed "ltp.prctl08.fail" on: commit: 2aa2f0a955c7459279e861f62c770f5f81d64f4f ("[PATCH] sched/fork: Fix timer_slack_ns inheritance for RT tasks") url: https://github.com/intel-lab-lkp/linux/commits/Xiao-Feng-via-B4-Relay/sched-fork-Fix-timer_slack_ns-inheritance-for-RT-tasks/20260520-210956 patch link: https://lore.kernel.org/all/20260520-sched-fork-fix-timer-slack-v1-1-d4fc937245b2@xiaomi.com/ patch subject: [PATCH] sched/fork: Fix timer_slack_ns inheritance for RT tasks in testcase: ltp version: with following parameters: disk: 1HDD fs: ext4 test: syscalls-05 config: x86_64-rhel-9.4-ltp compiler: gcc-14 test machine: 36 threads 1 sockets Intel(R) Core(TM) i9-10980XE CPU @ 3.00GHz (Cascade Lake) with 128G memory (please refer to attached dmesg/kmsg for entire log/backtrace) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <oliver.sang@intel.com> | Closes: https://lore.kernel.org/oe-lkp/202605281011.2ba77cc3-lkp@intel.com 2026-05-29 16:17:35 kirk -f syscalls-05 --tmp-dir /fs/sda1/tmpdir Host information Hostname: lkp-csl-d02 Python: 3.13.5 (main, Jun 25 2025, 18:55:22) [GCC 14.2.0] Directory: /fs/sda1/tmpdir/kirk.root/tmp0lg24sa6 Connecting to SUT: default Suite: syscalls-05 ────────────────── ... ^[[1;37mprctl02: ^[[0m^[[1;32mpass^[[0m | ^[[1;33mtainted^[[0m (0.011s) ^[[1;37mprctl08: ^[[0m^[[1;31mfail^[[0m | ^[[1;33mtainted^[[0m (0.011s) <--- ^[[1;37mpreadv203: ^[[0m^[[1;36mskip^[[0m | ^[[1;33mtainted^[[0m (47.775s) ^[[1;37mprofil01: ^[[0m^[[1;32mpass^[[0m | ^[[1;33mtainted^[[0m (5.005s) ... Execution time: 9m 8s Disconnecting from SUT: default Target information ────────────────── Kernel: Linux 7.1.0-rc4+ #1 SMP PREEMPT_DYNAMIC Tue May 26 16:01:55 CST 2026 Cmdline: ip=::::lkp-csl-d02::dhcp root=/dev/ram0 RESULT_ROOT=/result/ltp/1HDD-ext4-syscalls-05/lkp-csl-d02/debian-13-x86_64-20250902.cgz/x86_64-rhel-9.4-ltp/gcc-14/2aa2f0a955c7459279e861f62c770f5f81d64f4f/0 BOOT_IMAGE=/pkg/linux/x86_64-rhel-9.4-ltp/gcc-14/2aa2f0a955c7459279e861f62c770f5f81d64f4f/vmlinuz-7.1.0-rc4+ branch=linux-devel/devel-hourly-20260521-050335 job=/lkp/jobs/scheduled/lkp-csl-d02/ltp-1HDD-ext4-syscalls-05-debian-13-x86_64-20250902.cgz-2aa2f0a955c7-20260526-26280-5dbkeb-0.yaml user=lkp ARCH=x86_64 kconfig=x86_64-rhel-9.4-ltp commit=2aa2f0a955c7459279e861f62c770f5f81d64f4f intremap=posted_msi acpi_rsdp=0x36983000 max_uptime=14400 LKP_SERVER=10.239.97.5 nokaslr selinux=0 debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 net.ifnames=0 printk.devkmsg=on panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 drbd.minor_count=8 systemd.log_level=err ignore_loglevel console=tty0 earlyprintk=ttyS0,115200 console=ttyS0,115200 vga=normal rw keep_initrds=/osimage/pkg/debian-13-x86_64-20250902.cgz/ltp-x86_64-8cd7644a5-1_20260514.cgz acpi_rsdp=0x36983000 Machine: unknown Arch: x86_64 RAM: 114660756 kB Swap: 0 kB Distro: debian 13 ──────────────────────── TEST SUMMARY ──────────────────────── Suite: syscalls-05 Runtime: 9m 4s Runs: 189 Results: Passed: 1293 Failed: 3 Broken: 0 Skipped: 38 Warnings: 0 ^[[1;31mFailures:^[[0m • prctl08 Session stopped The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260528/202605281011.2ba77cc3-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki -- Mailing list info: https://lists.linux.it/listinfo/ltp ^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [LTP] [PATCH] sched/fork: Fix timer_slack_ns inheritance for RT tasks 2026-05-28 4:50 ` [LTP] [PATCH] sched/fork: Fix timer_slack_ns inheritance for RT tasks kernel test robot @ 2026-05-28 5:24 ` K Prateek Nayak via ltp 0 siblings, 0 replies; 2+ messages in thread From: K Prateek Nayak via ltp @ 2026-05-28 5:24 UTC (permalink / raw) To: kernel test robot, Xiao Feng via B4 Relay Cc: Juri Lelli, Xiao Feng, Michal Hocko, Peter Zijlstra, Ben Segall, Liam R. Howlett, lkp, Valentin Schneider, Vincent Guittot, Vlastimil Babka, aubrey.li, Kees Cook, Ingo Molnar, Mel Gorman, Steven Rostedt, Felix Moessbauer, David Hildenbrand, Lorenzo Stoakes, Suren Baghdasaryan, Dietmar Eggemann, ltp, yu.c.chen, linux-mm, linux-kernel, Thomas Gleixner, oe-lkp, Andrew Morton, Mike Rapoport Hello Oliver, Thank you for the test! On 5/28/2026 10:20 AM, kernel test robot wrote: > Suite: syscalls-05 > ────────────────── > > ... > > ^[[1;37mprctl02: ^[[0m^[[1;32mpass^[[0m | ^[[1;33mtainted^[[0m (0.011s) > ^[[1;37mprctl08: ^[[0m^[[1;31mfail^[[0m | ^[[1;33mtainted^[[0m (0.011s) <--- I think we are failing here https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/syscalls/prctl/prctl08.c#L86 for: {check_inherit_timerslack, 70000, 70000, "Child process"} This checks if the default timerslack is set to the Parent's timerslack at the time of fork and prctl(PR_SET_TIMERSLACK, 0) in the child process expects the timer slack to go back that inherited value. With this patch, instead of inheriting it, we are resetting it at 50us at the time of fork. Since this is documented in man page, I believe the test is correct and this will indeed be a behavior change. -- Thanks and Regards, Prateek -- Mailing list info: https://lists.linux.it/listinfo/ltp ^ permalink raw reply [flat|nested] 2+ messages in thread
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2026-05-28 4:50 ` [LTP] [PATCH] sched/fork: Fix timer_slack_ns inheritance for RT tasks kernel test robot
2026-05-28 5:24 ` K Prateek Nayak via ltp
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