From: Michael Ellerman <mpe@ellerman.id.au>
To: Denis Kirjanov <kda@linux-powerpc.org>,
Steven Rostedt <rostedt@goodmis.org>
Cc: linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 2/2] powerpc: tracing: don't trace hcalls on offline CPUs
Date: Tue, 12 Jan 2016 22:53:35 +1100 [thread overview]
Message-ID: <1452599615.20985.2.camel@ellerman.id.au> (raw)
In-Reply-To: <1450124286-4822-2-git-send-email-kda@linux-powerpc.org>
On Mon, 2015-12-14 at 23:18 +0300, Denis Kirjanov wrote:
> ./drmgr -c cpu -a -r gives the following warning:
>
> [ 2327.035563]
> RCU used illegally from offline CPU!
> rcu_scheduler_active = 1, debug_locks = 1
> [ 2327.035564] no locks held by swapper/12/0.
> [ 2327.035565]
> stack backtrace:
> [ 2327.035567] CPU: 12 PID: 0 Comm: swapper/12 Tainted: G S
> 4.3.0-rc3-00060-g353169a #5
> [ 2327.035568] Call Trace:
> [ 2327.035573] [c0000001d62578e0] [c0000000008977fc] .dump_stack+0x98/0xd4 (unreliable)
> [ 2327.035577] [c0000001d6257960] [c000000000109bd8] .lockdep_rcu_suspicious+0x108/0x170
> [ 2327.035580] [c0000001d62579f0] [c00000000006a1d0] .__trace_hcall_exit+0x2b0/0x2c0
> [ 2327.035584] [c0000001d6257ab0] [c00000000006a2e8] plpar_hcall_norets_trace+0x70/0x8c
> [ 2327.035588] [c0000001d6257b20] [c000000000067a14] .icp_hv_set_cpu_priority+0x54/0xc0
> [ 2327.035592] [c0000001d6257ba0] [c000000000066c5c] .xics_teardown_cpu+0x5c/0xa0
> [ 2327.035595] [c0000001d6257c20] [c0000000000747ac] .pseries_mach_cpu_die+0x6c/0x320
> [ 2327.035598] [c0000001d6257cd0] [c0000000000439cc] .cpu_die+0x3c/0x60
> [ 2327.035602] [c0000001d6257d40] [c0000000000183d8] .arch_cpu_idle_dead+0x28/0x40
> [ 2327.035606] [c0000001d6257db0] [c0000000000ff1dc] .cpu_startup_entry+0x4fc/0x560
> [ 2327.035610] [c0000001d6257ed0] [c000000000043728] .start_secondary+0x328/0x360
> [ 2327.035614] [c0000001d6257f90] [c000000000008a6c] start_secondary_prolog+0x10/0x14
> [ 2327.035620] cpu 12 (hwid 12) Ready to die...
> [ 2327.144463] cpu 13 (hwid 13) Ready to die...
> [ 2327.294180] cpu 14 (hwid 14) Ready to die...
> [ 2327.403599] cpu 15 (hwid 15) Ready to die...
>
> Make the hypervisor tracepoints conditional
> by using TRACE_EVENT_FN_COND
>
> Signed-off-by: Denis Kirjanov <kda@linux-powerpc.org>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
cheers
next prev parent reply other threads:[~2016-01-12 11:53 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-14 20:18 [PATCH v3 1/2] tracing: introduce TRACE_EVENT_FN_COND macro Denis Kirjanov
2015-12-14 20:18 ` [PATCH v3 2/2] powerpc: tracing: don't trace hcalls on offline CPUs Denis Kirjanov
2015-12-23 16:12 ` Steven Rostedt
2016-01-12 10:53 ` Denis Kirjanov
2016-01-12 11:53 ` Michael Ellerman [this message]
2016-01-19 11:53 ` Denis Kirjanov
2016-02-05 11:20 ` Denis Kirjanov
2016-02-05 14:36 ` Steven Rostedt
2016-02-05 14:48 ` Denis Kirjanov
2016-02-09 9:24 ` Michael Ellerman
2016-02-09 12:16 ` [v3,2/2] " Michael Ellerman
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