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SubjectWARNING: at arch/x86/kernel/smp.c:119 native_smp_send_reschedule+0x25/0x43()
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Hi all,

I got the following warning when shutting down a KVM guest with a whole bunch of cores (254 in this case).

It's actually pretty easy to reproduce it, it happens every once in 2-3 shutdowns.

[ 32.448626] ------------[ cut here ]------------
[ 32.449160] WARNING: at arch/x86/kernel/smp.c:119 native_smp_send_reschedule+0x25/0x43()
[ 32.449621] Pid: 1, comm: init_stage2 Not tainted 3.2.0+ #14
[ 32.449621] Call Trace:
[ 32.449621] <IRQ> [<ffffffff81041a44>] ? native_smp_send_reschedule+0x25/0x43
[ 32.449621] [<ffffffff810735b2>] warn_slowpath_common+0x7b/0x93
[ 32.449621] [<ffffffff810962cc>] ? tick_nohz_handler+0xc9/0xc9
[ 32.449621] [<ffffffff81073675>] warn_slowpath_null+0x15/0x18
[ 32.449621] [<ffffffff81041a44>] native_smp_send_reschedule+0x25/0x43
[ 32.449621] [<ffffffff81067a00>] smp_send_reschedule+0xa/0xc
[ 32.449621] [<ffffffff8106f25e>] scheduler_tick+0x21a/0x242
[ 32.449621] [<ffffffff8107da10>] update_process_times+0x62/0x73
[ 32.449621] [<ffffffff81096336>] tick_sched_timer+0x6a/0x8a
[ 32.449621] [<ffffffff8108c5eb>] __run_hrtimer.clone.26+0x55/0xcb
[ 32.449621] [<ffffffff8108cd77>] hrtimer_interrupt+0xcb/0x19b
[ 32.449621] [<ffffffff810428a8>] smp_apic_timer_interrupt+0x72/0x85
[ 32.449621] [<ffffffff8165a8de>] apic_timer_interrupt+0x6e/0x80
[ 32.449621] <EOI> [<ffffffff8165928e>] ? _raw_spin_unlock_irqrestore+0x3a/0x3e
[ 32.449621] [<ffffffff81042f4e>] ? arch_local_irq_restore+0x6/0xd
[ 32.449621] [<ffffffff810430c4>] default_send_IPI_mask_allbutself_phys+0x78/0x88
[ 32.449621] [<ffffffff8106c3c4>] ? __migrate_task+0xf1/0xf1
[ 32.449621] [<ffffffff81045445>] physflat_send_IPI_allbutself+0x12/0x14
[ 32.449621] [<ffffffff81041aaf>] native_stop_other_cpus+0x4d/0xa8
[ 32.449621] [<ffffffff810411c6>] native_machine_shutdown+0x56/0x6d
[ 32.449621] [<ffffffff81048499>] kvm_shutdown+0x1a/0x1c
[ 32.449621] [<ffffffff810411f9>] machine_shutdown+0xa/0xc
[ 32.449621] [<ffffffff81041265>] native_machine_restart+0x20/0x32
[ 32.449621] [<ffffffff81041297>] machine_restart+0xa/0xc
[ 32.449621] [<ffffffff81081d53>] kernel_restart+0x49/0x4d
[ 32.449621] [<ffffffff81081f26>] sys_reboot+0x14b/0x18a
[ 32.449621] [<ffffffff81089937>] ? remove_wait_queue+0x4c/0x51
[ 32.449621] [<ffffffff8107637f>] ? do_wait+0x1a4/0x1e7
[ 32.449621] [<ffffffff8107735a>] ? sys_wait4+0xa8/0xbc
[ 32.449621] [<ffffffff8107522b>] ? clear_tsk_thread_flag+0xf/0xf
[ 32.449621] [<ffffffff81659a25>] ? async_page_fault+0x25/0x30
[ 32.449621] [<ffffffff81659e92>] system_call_fastpath+0x16/0x1b
[ 32.449621] ---[ end trace d0f03651493fd3d6 ]--

--

Sasha.



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