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Message-ID: <20141006143431.GA21565@leverpostej> Date: Mon, 6 Oct 2014 15:34:31 +0100 From: Mark Rutland <mark.rutland@....com> To: Vince Weaver <vincent.weaver@...ne.edu> Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Will Deacon <Will.Deacon@....com>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org> Subject: Re: Perf lockups / stack overflows on v3.17-rc6, x86_64, arm, arm64 > > > Log 2, x86_64 stack overflow > > > > > [ 346.641345] divide error: 0000 [#1] SMP > > > [ 346.642010] Modules linked in: > > > [ 346.642010] CPU: 0 PID: 4076 Comm: perf_fuzzer Not tainted 3.17.0-rc6hark-perf-lockup+ #1 > > > [ 346.642010] Hardware name: LENOVO 7484A3G/LENOVO, BIOS 5CKT54AUS 09/07/2009 > > > [ 346.642010] task: ffff8801ac449a70 ti: ffff8801ac574000 task.ti: ffff8801ac574000 > > > [ 346.642010] RIP: 0010:[<ffffffff81078bce>] [<ffffffff81078bce>] find_busiest_group+0x28e/0x8a0 > > > [ 346.642010] RSP: 0018:ffff8801ac577760 EFLAGS: 00010006 > > > [ 346.642010] RAX: 00000000000003ff RBX: 0000000000000000 RCX: 00000000ffff8801 > > > [ 346.642010] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 > > > [ 346.642010] RBP: ffff8801ac577890 R08: 0000000000000000 R09: 0000000000000000 > > > [ 346.704010] ------------[ cut here ]------------ > > > [ 346.704017] WARNING: CPU: 2 PID: 5 at arch/x86/kernel/irq_64.c:70 handle_irq+0x141/0x150() > > > [ 346.704019] do_IRQ(): has overflown the kernel stack (cur:1,sp:ffff8801b653fe88,irq stk top-bottom:ffff8801bed00080-ffff8801bed03fc0,exception stk top-bottom:ffff8801bed04080-ffff8801bed0a000) > > > > weird, have not seen this before. Though I was hitting a reboot issue > > that would give really strange crash messages that was possibly fixed by > > a patch that went into 3.17-rc7. > > Interesting. I'll retry with v3.17. 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). Mark. ---->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 majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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