linux-kernel - Re: Perf events warning..

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Date:	Tue, 15 May 2012 09:37:37 -0600
From:	David Ahern <dsahern@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: Perf events warning..

On 5/15/12 9:28 AM, Peter Zijlstra wrote:
> On Tue, 2012-05-15 at 09:25 -0600, David Ahern wrote:
>>
>> Perhaps it is specific to processor generation?
>
> Your error is distinctly different from Linus' in that it came from
> within the arch code, Linus' was core code.
>
> Furthermore the error you send had:
>
>   [   31.528799] Hardware name: Bochs
>
> Which is some virt crap.. so I wouldn't trust the 'hardware' anyway.

:-) Right, KVM and the vPMU added in 3.3. That said, it is recognized as 
a Nehalem and perf walks the Nehalem events path.

So if VM based WARNING is not to your liking, here's a baremetal version:

[   84.388495] ------------[ cut here ]------------
[   84.388554] WARNING: at 
/opt/sw/ahern/kernels/kernel-2.6.git/arch/x86/kernel/cpu/perf_event.c:1054 
x86_pmu_start+0xdc/0x110()
[   84.388613] Hardware name: ProLiant DL380 G6
[   84.388663] Modules linked in: nfs fscache bridge stp llc 
ipt_MASQUERADE iptable_nat nf_nat xt_physdev nf_conntrack_ipv4 
nf_defrag_ipv4 xt_state nf_conntrack xt_multiport nfsd lockd nfs_acl 
auth_rpcgss sunrpc coretemp ipmi_si ipmi_msghandler bnx2 i7core_edac 
edac_core hpilo hpwdt acpi_power_meter crc32c_intel microcode iTCO_wdt 
iTCO_vendor_support vhost_net pcspkr macvtap macvlan tun virtio_net 
kvm_intel kvm usb_storage hpsa radeon ttm drm_kms_helper drm 
i2c_algo_bit i2c_core [last unloaded: scsi_wait_scan]
[   84.390624] Pid: 1806, comm: find Not tainted 3.4.0-rc7+ #1
[   84.390671] Call Trace:
[   84.390719]  [<ffffffff810579df>] warn_slowpath_common+0x7f/0xc0
[   84.390769]  [<ffffffff81057a3a>] warn_slowpath_null+0x1a/0x20
[   84.390831]  [<ffffffff8102546c>] x86_pmu_start+0xdc/0x110
[   84.390880]  [<ffffffff81025b22>] x86_pmu_enable+0x212/0x270
[   84.390996]  [<ffffffff81116496>] perf_event_context_sched_in+0xe6/0x100
[   84.391113]  [<ffffffff811180b3>] perf_event_comm+0x103/0x2b0
[   84.391232]  [<ffffffff81186732>] set_task_comm+0x72/0xe0
[   84.391361]  [<ffffffff81186e0b>] setup_new_exec+0x8b/0x240
[   84.391480]  [<ffffffff811ceca7>] load_elf_binary+0x3e7/0x19a0
[   84.391600]  [<ffffffff81145ac2>] ? get_user_pages+0x52/0x60
[   84.391716]  [<ffffffff81184af8>] ? get_user_arg_ptr+0x38/0x80
[   84.391833]  [<ffffffff81184f9e>] search_binary_handler+0xee/0x340
[   84.391963]  [<ffffffff811ce8c0>] ? load_elf_library+0x230/0x230
[   84.392080]  [<ffffffff81186bef>] do_execve_common+0x36f/0x410
[   84.392196]  [<ffffffff81186cca>] do_execve+0x3a/0x40
[   84.392328]  [<ffffffff8101d4a7>] sys_execve+0x47/0x70
[   84.392445]  [<ffffffff816002ec>] stub_execve+0x6c/0xc0
[   84.392558] ---[ end trace 78e50a201158fd5d ]---


Though this one is an HP server with the lovely:

[    0.143910] Performance Events: PEBS fmt1+, 16-deep LBR, Nehalem 
events, Broken BIOS detected, complain to your hardware vendor.
[    0.144351] [Firmware Bug]: the BIOS has corrupted hw-PMU resources 
(MSR 38d is 330)
[    0.144627] Intel PMU driver.
[    0.144777] CPU erratum AAJ80 worked around

David
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