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1fccb15145eb73b06af682aff47acfe47235f139 ("rcu/exp: Warn on CPU lagging for too long within hotplug IPI's blindspot") https://github.com/paulmckrcu/linux dev.2025.06.06a in testcase: rcutorture version: with following parameters: runtime: 300s test: cpuhotplug torture_type: rcu config: x86_64-randconfig-007-20250609 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) 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/202506121653.e7d1be72-lkp@intel.com [ 326.392305][ T17] ------------[ cut here ]------------ [ 326.395249][ T17] WARNING: CPU: 0 PID: 17 at kernel/rcu/tree_exp.h:419 __sync_rcu_exp_select_node_cpus (kbuild/obj/consumer/x86_64-randconfig-007-20250609/kernel/rcu/tree_exp.h:419 (discriminator 1)) [ 326.398772][ T17] Modules linked in: rcutorture torture [ 326.401711][ T17] CPU: 0 UID: 0 PID: 17 Comm: rcu_exp_gp_kthr Not tainted 6.15.0-rc1-00059-g1fccb15145eb #1 PREEMPT(full) c83de7334379d04ea860ac9db4e3031d8be8de51 [ 326.407801][ T17] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 326.411423][ T17] RIP: 0010:__sync_rcu_exp_select_node_cpus (kbuild/obj/consumer/x86_64-randconfig-007-20250609/kernel/rcu/tree_exp.h:419 (discriminator 1)) [ 326.414685][ T17] Code: 85 c0 74 02 0f 0b 48 8b 75 98 48 8b 7d b8 ff 45 a8 e8 c4 dd 5a 04 bf 01 00 00 00 e8 f7 c5 5a 04 83 7d a8 0a 0f 8e 8d fe ff ff <0f> 0b e9 86 fe ff ff 48 8b 55 d0 b8 ff ff 37 00 48 c1 e0 2a 48 c1 All code ======== 0: 85 c0 test %eax,%eax 2: 74 02 je 0x6 4: 0f 0b ud2 6: 48 8b 75 98 mov -0x68(%rbp),%rsi a: 48 8b 7d b8 mov -0x48(%rbp),%rdi e: ff 45 a8 incl -0x58(%rbp) 11: e8 c4 dd 5a 04 call 0x45addda 16: bf 01 00 00 00 mov $0x1,%edi 1b: e8 f7 c5 5a 04 call 0x45ac617 20: 83 7d a8 0a cmpl $0xa,-0x58(%rbp) 24: 0f 8e 8d fe ff ff jle 0xfffffffffffffeb7 2a:* 0f 0b ud2 <-- trapping instruction 2c: e9 86 fe ff ff jmp 0xfffffffffffffeb7 31: 48 8b 55 d0 mov -0x30(%rbp),%rdx 35: b8 ff ff 37 00 mov $0x37ffff,%eax 3a: 48 c1 e0 2a shl $0x2a,%rax 3e: 48 rex.W 3f: c1 .byte 0xc1 Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: e9 86 fe ff ff jmp 0xfffffffffffffe8d 7: 48 8b 55 d0 mov -0x30(%rbp),%rdx b: b8 ff ff 37 00 mov $0x37ffff,%eax 10: 48 c1 e0 2a shl $0x2a,%rax 14: 48 rex.W 15: c1 .byte 0xc1 [ 326.421654][ T17] RSP: 0018:ffffc9000011fd30 EFLAGS: 00010202 [ 326.424977][ T17] RAX: 0000000000000000 RBX: ffffffff8837a488 RCX: 0000000000000000 [ 326.428491][ T17] RDX: 0000000000000000 RSI: 0000000000000006 RDI: fffff52000023f7c [ 326.432035][ T17] RBP: ffffc9000011fdc0 R08: 0000000000000008 R09: 0000000000000000 [ 326.435624][ T17] R10: fffffbfff147169b R11: ffffffff815ac0e5 R12: ffff8883ae954240 [ 326.439162][ T17] R13: dffffc0000000000 R14: 0000000000000002 R15: 0000000000000001 [ 326.442708][ T17] FS: 0000000000000000(0000) GS:ffff8884241ef000(0000) knlGS:0000000000000000 [ 326.446372][ T17] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 326.449774][ T17] CR2: 000000000805b740 CR3: 0000000153efc000 CR4: 00000000000406f0 [ 326.453432][ T17] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 326.456814][ T17] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 326.460466][ T17] Call Trace: [ 326.463548][ T17] [ 326.466479][ T17] sync_rcu_exp_select_node_cpus (kbuild/obj/consumer/x86_64-randconfig-007-20250609/kernel/rcu/tree_exp.h:466) [ 326.469763][ T17] sync_rcu_exp_select_cpus (kbuild/obj/consumer/x86_64-randconfig-007-20250609/kernel/rcu/tree_exp.h:533) [ 326.473086][ T17] wait_rcu_exp_gp (kbuild/obj/consumer/x86_64-randconfig-007-20250609/kernel/rcu/tree_exp.h:731 kbuild/obj/consumer/x86_64-randconfig-007-20250609/kernel/rcu/tree_exp.h:502) [ 326.476305][ T17] kthread_worker_fn (kbuild/obj/consumer/x86_64-randconfig-007-20250609/arch/x86/include/asm/jump_label.h:36 kbuild/obj/consumer/x86_64-randconfig-007-20250609/include/trace/events/sched.h:119 kbuild/obj/consumer/x86_64-randconfig-007-20250609/kernel/kthread.c:1015) [ 326.479478][ T17] ? __kasan_check_read (kbuild/obj/consumer/x86_64-randconfig-007-20250609/mm/kasan/shadow.c:32) [ 326.482614][ T17] ? strict_work_handler (kbuild/obj/consumer/x86_64-randconfig-007-20250609/kernel/rcu/tree_exp.h:498) [ 326.485790][ T17] ? kthread_flush_work (kbuild/obj/consumer/x86_64-randconfig-007-20250609/kernel/kthread.c:971) [ 326.488992][ T17] kthread (kbuild/obj/consumer/x86_64-randconfig-007-20250609/kernel/kthread.c:464) [ 326.492081][ T17] ? preempt_latency_stop (kbuild/obj/consumer/x86_64-randconfig-007-20250609/kernel/sched/core.c:5876) [ 326.495175][ T17] ? kthread_is_per_cpu (kbuild/obj/consumer/x86_64-randconfig-007-20250609/kernel/kthread.c:413) [ 326.497975][ T17] ? _raw_spin_unlock_irq (kbuild/obj/consumer/x86_64-randconfig-007-20250609/arch/x86/include/asm/preempt.h:104 kbuild/obj/consumer/x86_64-randconfig-007-20250609/include/linux/spinlock_api_smp.h:160 kbuild/obj/consumer/x86_64-randconfig-007-20250609/kernel/locking/spinlock.c:202) [ 326.501111][ T17] ? calculate_sigpending (kbuild/obj/consumer/x86_64-randconfig-007-20250609/kernel/signal.c:195) [ 326.504292][ T17] ? kthread_is_per_cpu (kbuild/obj/consumer/x86_64-randconfig-007-20250609/kernel/kthread.c:413) [ 326.507344][ T17] ret_from_fork (kbuild/obj/consumer/x86_64-randconfig-007-20250609/arch/x86/kernel/process.c:159) [ 326.510341][ T17] ? kthread_is_per_cpu (kbuild/obj/consumer/x86_64-randconfig-007-20250609/kernel/kthread.c:413) [ 326.513345][ T17] ret_from_fork_asm (kbuild/obj/consumer/x86_64-randconfig-007-20250609/arch/x86/entry/entry_64.S:258) [ 326.516352][ T17] [ 326.519111][ T17] irq event stamp: 974697 [ 326.521876][ T17] hardirqs last enabled at (974711): __up_console_sem (kbuild/obj/consumer/x86_64-randconfig-007-20250609/arch/x86/include/asm/irqflags.h:26 (discriminator 1) kbuild/obj/consumer/x86_64-randconfig-007-20250609/arch/x86/include/asm/irqflags.h:109 (discriminator 1) kbuild/obj/consumer/x86_64-randconfig-007-20250609/arch/x86/include/asm/irqflags.h:151 (discriminator 1) kbuild/obj/consumer/x86_64-randconfig-007-20250609/kernel/printk/printk.c:344 (discriminator 1)) [ 326.525370][ T17] hardirqs last disabled at (974724): __up_console_sem (kbuild/obj/consumer/x86_64-randconfig-007-20250609/kernel/printk/printk.c:342 (discriminator 1)) [ 326.528804][ T17] softirqs last enabled at (974422): handle_softirqs (kbuild/obj/consumer/x86_64-randconfig-007-20250609/arch/x86/include/asm/preempt.h:27 kbuild/obj/consumer/x86_64-randconfig-007-20250609/kernel/softirq.c:426 kbuild/obj/consumer/x86_64-randconfig-007-20250609/kernel/softirq.c:607) [ 326.532296][ T17] softirqs last disabled at (974411): __do_softirq (kbuild/obj/consumer/x86_64-randconfig-007-20250609/kernel/softirq.c:614) [ 326.535643][ T17] ---[ end trace 0000000000000000 ]--- [ 326.717325][ T1035] smpboot: CPU 1 is now offline [ 326.743123][ T886] smpboot: Booting Node 0 Processor 1 APIC 0x1 [ 326.747940][ T0] Masked ExtINT on CPU#1 [ 326.806808][ T1035] smpboot: CPU 1 is now offline [ 326.836198][ T886] smpboot: Booting Node 0 Processor 1 APIC 0x1 [ 326.841248][ T0] Masked ExtINT on CPU#1 [ 326.907274][ T1035] smpboot: CPU 1 is now offline [ 326.932209][ T886] smpboot: Booting Node 0 Processor 1 APIC 0x1 [ 326.936569][ T0] Masked ExtINT on CPU#1 The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250612/202506121653.e7d1be72-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki