On Mon, 6 Oct 2014, Mark Rutland wrote: > So far I haven't been able to trigger the above failure on v3.17, so perhaps > some patch has fixed that. > > With the same seed (1411654897) I can trigger a hw_breakpoint warning > relatively repeatably (logs for a couple of instances below).
I see those fairly frequently too. Adding some breakpoint people to the CC and maybe they can help debug it. Vince > ---->8---- > [ 3268.694056] ------------[ cut here ]------------ > [ 3268.694066] WARNING: CPU: 0 PID: 19671 at > arch/x86/kernel/hw_breakpoint.c:119 arch_install_hw_breakpoint+0xf0/0x100() > [ 3268.694068] Can't find any breakpoint slot > [ 3268.694070] Modules linked in: > [ 3268.694075] CPU: 0 PID: 19671 Comm: perf_fuzzer Not tainted > 3.17.0hark-lockup2-2014-10-06 #4 > [ 3268.694077] Hardware name: LENOVO 7484A3G/LENOVO, BIOS 5CKT54AUS 09/07/2009 > [ 3268.694079] 0000000000000009 ffff88019a343c78 ffffffff8182da5c > ffff88019a343cc0 > [ 3268.694084] ffff88019a343cb0 ffffffff8104af38 ffff8801af5ec800 > ffff8801a0faae00 > [ 3268.694088] ffff8801bec16780 ffff8801bec16784 000001b8c35e3e18 > ffff88019a343d10 > [ 3268.694092] Call Trace: > [ 3268.694098] [<ffffffff8182da5c>] dump_stack+0x45/0x56 > [ 3268.694103] [<ffffffff8104af38>] warn_slowpath_common+0x78/0xa0 > [ 3268.694106] [<ffffffff8104afa7>] warn_slowpath_fmt+0x47/0x50 > [ 3268.694110] [<ffffffff8100a720>] arch_install_hw_breakpoint+0xf0/0x100 > [ 3268.694114] [<ffffffff8111101f>] hw_breakpoint_add+0x3f/0x50 > [ 3268.694117] [<ffffffff8110b3d4>] event_sched_in.isra.80+0x84/0x1b0 > [ 3268.694121] [<ffffffff8110b569>] group_sched_in+0x69/0x1e0 > [ 3268.694124] [<ffffffff8110c5cb>] ? perf_event_update_userpage+0xeb/0x160 > [ 3268.694129] [<ffffffff8107568d>] ? sched_clock_local+0x1d/0x80 > [ 3268.694132] [<ffffffff8110b7b2>] ctx_sched_in.isra.81+0xd2/0x1a0 > [ 3268.694136] [<ffffffff8110b8cf>] perf_event_sched_in.isra.84+0x4f/0x70 > [ 3268.694139] [<ffffffff8110bac3>] > perf_event_context_sched_in.isra.85+0x73/0xc0 > [ 3268.694142] [<ffffffff8110c175>] __perf_event_task_sched_in+0x185/0x1a0 > [ 3268.694147] [<ffffffff8106c832>] finish_task_switch+0xb2/0xf0 > [ 3268.694151] [<ffffffff818339bf>] __schedule+0x34f/0x810 > [ 3268.694154] [<ffffffff81833ea4>] schedule+0x24/0x70 > [ 3268.694158] [<ffffffff818395d1>] int_careful+0xd/0x14 > [ 3268.694160] ---[ end trace e1f62407a7d7e846 ]--- > ---->8---- > > ---->8---- > [ 4016.924076] ------------[ cut here ]------------ > [ 4016.925039] WARNING: CPU: 1 PID: 14091 at > arch/x86/kernel/hw_breakpoint.c:119 arch_install_hw_breakpoint+0xf0/0x100() > [ 4016.925039] Can't find any breakpoint slot > [ 4016.925039] Modules linked in: > [ 4016.925039] CPU: 1 PID: 14091 Comm: perf_fuzzer Not tainted > 3.17.0hark-lockup2-2014-10-06 #4 > [ 4016.925039] Hardware name: LENOVO 7484A3G/LENOVO, BIOS 5CKT54AUS 09/07/2009 > [ 4016.925039] 0000000000000009 ffff8800cd85f9a8 ffffffff8182da5c > ffff8800cd85f9f0 > [ 4016.925039] ffff8800cd85f9e0 ffffffff8104af38 ffff8800e38bd000 > ffff8801a6fb1c00 > [ 4016.925039] ffff8801bec96780 ffff8801bec96784 0000027400d480df > ffff8800cd85fa40 > [ 4016.925039] Call Trace: > [ 4016.925039] [<ffffffff8182da5c>] dump_stack+0x45/0x56 > [ 4016.925039] [<ffffffff8104af38>] warn_slowpath_common+0x78/0xa0 > [ 4016.925039] [<ffffffff8104afa7>] warn_slowpath_fmt+0x47/0x50 > [ 4016.925039] [<ffffffff8100a720>] arch_install_hw_breakpoint+0xf0/0x100 > [ 4016.925039] [<ffffffff8111101f>] hw_breakpoint_add+0x3f/0x50 > [ 4016.925039] [<ffffffff8110b3d4>] event_sched_in.isra.80+0x84/0x1b0 > [ 4016.925039] [<ffffffff8110b569>] group_sched_in+0x69/0x1e0 > [ 4016.925039] [<ffffffff8110c5cb>] ? perf_event_update_userpage+0xeb/0x160 > [ 4016.925039] [<ffffffff8107568d>] ? sched_clock_local+0x1d/0x80 > [ 4016.925039] [<ffffffff8110b7b2>] ctx_sched_in.isra.81+0xd2/0x1a0 > [ 4016.925039] [<ffffffff8110b8cf>] perf_event_sched_in.isra.84+0x4f/0x70 > [ 4016.925039] [<ffffffff8110bac3>] > perf_event_context_sched_in.isra.85+0x73/0xc0 > [ 4016.925039] [<ffffffff8110c175>] __perf_event_task_sched_in+0x185/0x1a0 > [ 4016.925039] [<ffffffff8106c832>] finish_task_switch+0xb2/0xf0 > [ 4016.925039] [<ffffffff818339bf>] __schedule+0x34f/0x810 > [ 4016.925039] [<ffffffff81833ea4>] schedule+0x24/0x70 > [ 4016.925039] [<ffffffff81837ca9>] schedule_timeout+0x1b9/0x290 > [ 4016.925039] [<ffffffff81835113>] ? wait_for_completion+0x23/0x100 > [ 4016.925039] [<ffffffff8183518c>] wait_for_completion+0x9c/0x100 > [ 4016.925039] [<ffffffff81072800>] ? wake_up_state+0x10/0x10 > [ 4016.925039] [<ffffffff8109e7f0>] ? call_rcu_bh+0x20/0x20 > [ 4016.925039] [<ffffffff8109c766>] wait_rcu_gp+0x46/0x50 > [ 4016.925039] [<ffffffff8109c710>] ? > ftrace_raw_output_rcu_utilization+0x50/0x50 > [ 4016.925039] [<ffffffff8109ee93>] synchronize_sched+0x33/0x50 > [ 4016.925039] [<ffffffff810f9fab>] perf_trace_event_unreg.isra.1+0x3b/0x90 > [ 4016.925039] [<ffffffff810fa318>] perf_trace_destroy+0x38/0x50 > [ 4016.925039] [<ffffffff81106d99>] tp_perf_event_destroy+0x9/0x10 > [ 4016.925039] [<ffffffff81108523>] __free_event+0x23/0x70 > [ 4016.925039] [<ffffffff8110f057>] SYSC_perf_event_open+0x397/0xa50 > [ 4016.925039] [<ffffffff8110fad9>] SyS_perf_event_open+0x9/0x10 > [ 4016.925039] [<ffffffff81839550>] tracesys+0xdd/0xe2 > [ 4016.925039] ---[ end trace a2fe478e9cb5649b ]--- > ---->8---- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
