The perf_fuzzer triggered this on a core2 machine running 3.14-rc5. Mar 3 13:35:18 core2 kernel: [ 4100.124001] WARNING: CPU: 0 PID: 25900 at arch/x86/kernel/hw_breakpoint.c:120 arch_install_hw_breakpoint+0x6b/0xf8() Mar 3 13:35:18 core2 kernel: [ 4100.124001] Can't find any breakpoint slot Mar 3 13:35:18 core2 kernel: [ 4100.124001] Modules linked in: cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_conservative f71882fg mcs7830 ohci_pci usbnet evdev pcspkr psmouse serio_raw coretemp ohci_hcd i2c_nforce2 video wmi button acpi_cpufreq processor thermal_sys sg ehci_pci ehci_hcd sd_mod usbcore usb_common Mar 3 13:35:18 core2 kernel: [ 4100.124001] CPU: 0 PID: 25900 Comm: perf_fuzzer Not tainted 3.14.0-rc5 #32 Mar 3 13:35:18 core2 kernel: [ 4100.124001] Hardware name: AOpen DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIOS 080015 10/19/2012 Mar 3 13:35:18 core2 kernel: [ 4100.124001] 0000000000000078 ffff880071189b18 ffffffff81531e61 0000000000000078 Mar 3 13:35:18 core2 kernel: [ 4100.124001] ffff880071189b68 ffff880071189b58 ffffffff8103fce4 ffff880071189b48 Mar 3 13:35:18 core2 kernel: [ 4100.124001] ffffffff81008e38 0000000000000004 ffff8800cb0e4800 ffff8800cad04680 Mar 3 13:35:18 core2 kernel: [ 4100.124001] Call Trace: Mar 3 13:35:18 core2 kernel: [ 4100.124001] [<ffffffff81531e61>] dump_stack+0x49/0x60 Mar 3 13:35:18 core2 kernel: [ 4100.124001] [<ffffffff8103fce4>] warn_slowpath_common+0x81/0x9b Mar 3 13:35:18 core2 kernel: [ 4100.124001] [<ffffffff81008e38>] ? arch_install_hw_breakpoint+0x6b/0xf8 Mar 3 13:35:18 core2 kernel: [ 4100.124001] [<ffffffff8103fda1>] warn_slowpath_fmt+0x46/0x48 Mar 3 13:35:18 core2 kernel: [ 4100.124001] [<ffffffff81008e38>] arch_install_hw_breakpoint+0x6b/0xf8 Mar 3 13:35:18 core2 kernel: [ 4100.124001] [<ffffffff810d35a5>] hw_breakpoint_add+0x49/0x4d Mar 3 13:35:18 core2 kernel: [ 4100.124001] [<ffffffff810ccfe8>] event_sched_in+0x8c/0x12d Mar 3 13:35:18 core2 kernel: [ 4100.124001] [<ffffffff810cd0d3>] group_sched_in+0x4a/0x147 Mar 3 13:35:18 core2 kernel: [ 4100.124001] [<ffffffff810cd32e>] ctx_sched_in+0x15e/0x185 Mar 3 13:35:18 core2 kernel: [ 4100.124001] [<ffffffff810cd3be>] perf_event_sched_in+0x69/0x72 Mar 3 13:35:18 core2 kernel: [ 4100.124001] [<ffffffff810cd48f>] __perf_install_in_context+0xc8/0xf1 Mar 3 13:35:18 core2 kernel: [ 4100.124001] [<ffffffff810cdcc2>] ? perf_event_task_output+0x13d/0x13d Mar 3 13:35:18 core2 kernel: [ 4100.124001] [<ffffffff810cdcfe>] remote_function+0x3c/0x43 Mar 3 13:35:18 core2 kernel: [ 4100.124001] [<ffffffff81095451>] smp_call_function_single+0x8a/0x101 Mar 3 13:35:18 core2 kernel: [ 4100.124001] [<ffffffff810cdd49>] task_function_call+0x44/0x4e Mar 3 13:35:18 core2 kernel: [ 4100.124001] [<ffffffff810cd3c7>] ? perf_event_sched_in+0x72/0x72 Mar 3 13:35:18 core2 kernel: [ 4100.124001] [<ffffffff810cde7e>] perf_install_in_context+0x81/0xbc Mar 3 13:35:18 core2 kernel: [ 4100.124001] [<ffffffff815332fb>] ? mutex_lock+0x16/0x37 Mar 3 13:35:18 core2 kernel: [ 4100.124001] [<ffffffff810d214d>] SYSC_perf_event_open+0x647/0x7f5 Mar 3 13:35:18 core2 kernel: [ 4100.124001] [<ffffffff810cb607>] ? perf_event_for_each_child+0x82/0x8b Mar 3 13:35:18 core2 kernel: [ 4100.124001] [<ffffffff810cdeb9>] ? perf_install_in_context+0xbc/0xbc Mar 3 13:35:18 core2 kernel: [ 4100.124001] [<ffffffff810d2304>] SyS_perf_event_open+0x9/0xb Mar 3 13:35:18 core2 kernel: [ 4100.124001] [<ffffffff8153bf26>] system_call_fastpath+0x1a/0x1f Mar 3 13:35:18 core2 kernel: [ 4100.124001] ---[ end trace e316e2bd7d603a09 ]---
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