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X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV3PR11MB8675 X-OriginatorOrg: intel.com Hello, kernel test robot noticed "BUG:KCSAN:data-race_in__tmigr_cpu_activate/print_report" on: commit: 10a0e6f3d3db7dcfe36e578923e5f038f1d2b72a ("timers/migration: Move hierarchy setup into cpuhotplug prepare callback") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master [test failed on linus/master ccb98ccef0e543c2bd4ef1a72270461957f3d8d0] [test failed on linux-next/master 8155b4ef3466f0e289e8fcc9e6e62f3f4dceeac2] in testcase: trinity version: with following parameters: runtime: 300s group: group-00 nr_groups: 5 config: x86_64-randconfig-003-20241231 compiler: gcc-12 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G (please refer to attached dmesg/kmsg for entire log/backtrace) we observed the issue happens randomly, but keeps clean on parent. facd40aa5c4699f9 10a0e6f3d3db7dcfe36e578923e ---------------- --------------------------- fail:runs %reproduction fail:runs | | | :48 17% 8:48 dmesg.BUG:KCSAN:data-race_in__tmigr_cpu_activate/print_report 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 | Closes: https://lore.kernel.org/oe-lkp/202501031612.62e0c498-lkp@intel.com [ 30.027314][ T0] BUG: KCSAN: data-race in __tmigr_cpu_activate / print_report [ 30.027314][ T0] [ 30.027314][ T0] write to 0xffff88842fc28004 of 1 bytes by task 0 on cpu 0: [ 30.027314][ T0] __tmigr_cpu_activate (kernel/time/timer_migration.c:689) [ 30.027314][ T0] tmigr_cpu_activate (kernel/time/timer_migration.c:713) [ 30.027314][ T0] timer_clear_idle (kernel/time/timer.c:2380 (discriminator 22)) [ 30.027314][ T0] tick_nohz_restart_sched_tick (kernel/time/tick-sched.c:1097) [ 30.027314][ T0] tick_nohz_idle_exit (kernel/time/tick-sched.c:1442 kernel/time/tick-sched.c:1483) [ 30.027314][ T0] do_idle (arch/x86/include/asm/bitops.h:75 include/linux/sched/idle.h:36 kernel/sched/idle.c:346) [ 30.027314][ T0] cpu_startup_entry (kernel/sched/idle.c:429 (discriminator 1)) [ 30.027314][ T0] kernel_init (init/main.c:1459) [ 30.027314][ T0] do_initcalls (init/main.c:1333) [ 30.027314][ T0] clear_bss (arch/x86/kernel/head64.c:381) [ 30.027314][ T0] reserve_bios_regions (arch/x86/kernel/ebda.c:57) [ 30.027314][ T0] common_startup_64 (arch/x86/kernel/head_64.S:421) [ 30.027314][ T0] [ 30.027314][ T0] read to 0xffff88842fc28004 of 1 bytes by task 0 on cpu 1: [ 30.027314][ T0] print_report (kernel/kcsan/report.c:395) [ 30.027314][ T0] kcsan_report_known_origin (kernel/kcsan/report.c:504 kernel/kcsan/report.c:694) [ 30.027314][ T0] kcsan_setup_watchpoint (kernel/kcsan/core.c:678) [ 30.027314][ T0] tmigr_next_groupevt (kernel/time/timer_migration.c:576) [ 30.027314][ T0] tmigr_update_events (kernel/time/timer_migration.c:618 kernel/time/timer_migration.c:853) [ 30.027314][ T0] tmigr_inactive_up (kernel/time/timer_migration.c:1327) [ 30.027314][ T0] __walk_groups+0x50/0x77 [ 30.027314][ T0] walk_groups (kernel/time/timer_migration.c:501 (discriminator 9)) [ 30.027314][ T0] __tmigr_cpu_deactivate (kernel/time/timer_migration.c:1351) [ 30.027314][ T0] tmigr_cpu_deactivate (kernel/time/timer_migration.c:1374) [ 30.027314][ T0] __get_next_timer_interrupt (kernel/time/timer.c:2192 kernel/time/timer.c:2267) [ 30.027314][ T0] timer_base_try_to_set_idle (kernel/time/timer.c:2357) [ 30.027314][ T0] tick_nohz_stop_tick (kernel/time/tick-sched.c:987) [ 30.027314][ T0] tick_nohz_idle_stop_tick (kernel/time/tick-sched.c:1228) [ 30.027314][ T0] cpuidle_idle_call (kernel/sched/idle.c:191) [ 30.027314][ T0] do_idle (kernel/sched/idle.c:334) [ 30.027314][ T0] cpu_startup_entry (kernel/sched/idle.c:429 (discriminator 1)) [ 30.027314][ T0] common_cpu_up (arch/x86/kernel/smpboot.c:850) [ 30.027314][ T0] common_startup_64 (arch/x86/kernel/head_64.S:421) [ 30.027314][ T0] [ 30.027314][ T0] value changed: 0x00 -> 0x01 [ 30.027314][ T0] [ 30.027314][ T0] Reported by Kernel Concurrency Sanitizer on: [ 30.027314][ T0] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G T 6.10.0-rc6-00002-g10a0e6f3d3db #1 [ 30.027314][ T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 30.027314][ T0] ================================================================== The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250103/202501031612.62e0c498-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki