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Date: Fri, 30 Aug 2013 10:55:52 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Dave Jones <davej@redhat.com>, Linux Kernel <linux-kernel@vger.kernel.org>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Subject: Re: perf_swevent_add warn_on.
Message-ID: <20130830085552.GB10002@twins.programming.kicks-ass.net>
References: <20130830035716.GA3713@redhat.com>
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On Thu, Aug 29, 2013 at 11:57:16PM -0400, Dave Jones wrote:
> WARNING: CPU: 2 PID: 7498 at kernel/events/core.c:5485 perf_swevent_add+0x18d/0x1a0()
> Modules linked in: snd_seq_dummy 8021q garp stp fuse tun rfcomm hidp nfnetlink ipt_ULOG nfc caif_socket caif af_802154 phonet af_rxrpc bnep bluetooth can_bcm rfkill can_raw can llc2 pppoe pppox ppp_generic slhc irda crc_ccitt scsi_transport_iscsi rds af_key rose x25 atm netrom appletalk ipx p8023 psnap p8022 llc ax25 xfs libcrc32c snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_page_alloc snd_timer snd e1000e usb_debug ptp soundcore pps_core pcspkr
> CPU: 2 PID: 7498 Comm: trinity-child1 Not tainted 3.11.0-rc7+ #32 
>  ffffffff81a228d4 ffff88022ea55a70 ffffffff816fa71e 0000000000000000
>  ffff88022ea55aa8 ffffffff81052ebd ffff88022d147000 ffff88024d9cf3e0
>  0000000000000003 0000000000000001 0000000009527bd7 ffff88022ea55ab8
> Call Trace:
>  [<ffffffff816fa71e>] dump_stack+0x54/0x74
>  [<ffffffff81052ebd>] warn_slowpath_common+0x7d/0xa0
>  [<ffffffff81052f9a>] warn_slowpath_null+0x1a/0x20
>  [<ffffffff8113ea2d>] perf_swevent_add+0x18d/0x1a0
>  [<ffffffff8113f4e7>] event_sched_in.isra.75+0x87/0x1c0
>  [<ffffffff8114035a>] group_sched_in+0x6a/0x1c0
>  [<ffffffff81140f21>] ctx_sched_in+0x101/0x290
>  [<ffffffff81141110>] perf_event_sched_in+0x60/0x90
>  [<ffffffff81144c0b>] perf_event_context_sched_in+0x7b/0xc0
>  [<ffffffff81145777>] __perf_event_task_sched_in+0x477/0x490
>  [<ffffffff81098c74>] ? arch_vtime_task_switch+0x94/0xa0
>  [<ffffffff8108cb70>] finish_task_switch+0xf0/0x130
>  [<ffffffff817015fd>] __schedule+0x34d/0x970
>  [<ffffffff81701c49>] schedule+0x29/0x70
>  [<ffffffff810831b4>] do_cpu_nanosleep+0x154/0x250
>  [<ffffffff8108316b>] ? do_cpu_nanosleep+0x10b/0x250
>  [<ffffffff810833c9>] posix_cpu_nsleep+0x69/0x120
>  [<ffffffff81083493>] process_cpu_nsleep+0x13/0x20
>  [<ffffffff8107feaa>] SyS_clock_nanosleep+0x9a/0x110
>  [<ffffffff8170ded4>] tracesys+0xdd/0xe2
> ---[ end trace 809ae0fc0cbb6fcc ]---
> 
> 
> 5484         head = find_swevent_head(swhash, event);
> 5485         if (WARN_ON_ONCE(!head))
> 5486                 return -EINVAL;
> 5487 
> 

Does
http://lkml.kernel.org/r/1377355554-8934-1-git-send-email-jolsa@redhat.com
help with that?
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