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Message-ID: <928CFBE8E7CB0040959E56B4EA41A77E923FFCA4@irsmsx504.ger.corp.intel.com>
Date: Fri, 20 Mar 2009 08:07:53 +0000
From: "Metzger, Markus T" <markus.t.metzger@...el.com>
To: Ingo Molnar <mingo@...e.hu>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"tglx@...utronix.de" <tglx@...utronix.de>,
"hpa@...or.com" <hpa@...or.com>,
"markus.t.metzger@...il.com" <markus.t.metzger@...il.com>,
"roland@...hat.com" <roland@...hat.com>,
"eranian@...glemail.com" <eranian@...glemail.com>,
"oleg@...hat.com" <oleg@...hat.com>,
"Villacis, Juan" <juan.villacis@...el.com>,
"ak@...ux.jf.intel.com" <ak@...ux.jf.intel.com>
Subject: RE: [patch] x86, bts: use atomic memory allocation
>-----Original Message-----
>From: Ingo Molnar [mailto:mingo@...e.hu]
>Sent: Thursday, March 19, 2009 5:12 PM
>To: Metzger, Markus T
>> Ds_request_bts() needs to allocate memory. It uses GFP_KERNEL.
>>
>> Hw-branch-tracer calls ds_request_bts() within on_each_cpu().
>>
>> Use atomic memory allocation to allow it to be used in that context.
>
>the hw-branch-tracer still crashes during bootup. Have you tried the
>config i sent to you, and have you tried to reproduce it? I've
>attached another config that crashes.
The first config boots OK.
The second config boots OK with the additional changes to keep the GFP_KERNEL
and move the ds_request_bts() calls out of the on_each_cpu() in the hw-branch-tracer.
I don't know yet what exactly causes the crash and if there is a simpler fix.
I'm not sure I did it right, though. None of the configs worked as-is. I had to
answer a few additional questions for each one.
Here's what I did:
$ cp config.bad .config
$ make oldconfig
<press return a few times>
$ make
What's strange in the log you sent is that I do not see any
"[ds] using <whatever> configuration" messages.
I don't see any error message, either. It simply stops when it starts testing
the hw-branch-tracer.
When I boot that configuration (without the additional patches), I get some
error dumps on the screen including a call trace. Unfortunately, the interesting
part scrolls out of the top of my screen and the boot stops.
Are those logs stored somewhere? I looked in /var/log/messages but I only
found messages from successful boots; /var/log/dmesg also seems to contain only
the last successful boot.
If I can't get the logs, is there a way to restrict the depth of the call trace?
I then bootet a defconfig kernel with some debugging enabled and I get the following
message:
[ 1.731080] inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage.
[ 1.731180] swapper/0 [HC1[1]:SC0[0]:HE0:SE1] takes:
[ 1.731180] (ds_lock){?.+...}, at: [<ffffffff8101560f>] ds_put_context+0x21/0xf3
How would I read this error message?
It's pretty clear that something is wrong with ds_lock, but what exactly is the
error condition that was detected?
Here's the full error log:
[ 1.730182] =================================
[ 1.730538] [ INFO: inconsistent lock state ]
[ 1.730719] 2.6.29-rc8 #1 SMP Thu Mar 19 20:39:13 CET 2009
[ 1.730900] ---------------------------------
[ 1.731080] inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage.
[ 1.731180] swapper/0 [HC1[1]:SC0[0]:HE0:SE1] takes:
[ 1.731180] (ds_lock){?.+...}, at: [<ffffffff8101560f>] ds_put_context+0x21/0xf3
[ 1.731180] {HARDIRQ-ON-W} state was registered at:
[ 1.731180] [<ffffffff8105f4f0>] __lock_acquire+0x29c/0xb61
[ 1.731180] [<ffffffff8106077c>] lock_acquire+0xbc/0xe0
[ 1.731180] [<ffffffff814bb19c>] _spin_lock+0x2c/0x38
[ 1.731180] [<ffffffff81015ab1>] ds_request+0xee/0x214
[ 1.731180] [<ffffffff81015e41>] ds_request_bts+0xab/0x18d
[ 1.731180] [<ffffffff81015f44>] ds_request_bts_cpu+0x21/0x23
[ 1.731180] [<ffffffff81016583>] ds_selftest_bts+0x74/0x161
[ 1.731180] [<ffffffff817dd553>] ds_selftest+0x12/0x6e
[ 1.731180] [<ffffffff8100905c>] do_one_initcall+0x56/0x130
[ 1.731180] [<ffffffff817d78dd>] kernel_init+0x139/0x191
[ 1.731180] [<ffffffff8100cc3a>] child_rip+0xa/0x20
[ 1.731180] [<ffffffffffffffff>] 0xffffffffffffffff
[ 1.731180] irq event stamp: 48158
[ 1.731180] hardirqs last enabled at (48157): [<ffffffff8100c63c>] restore_args+0x0/0x30
[ 1.731180] hardirqs last disabled at (48158): [<ffffffff8100b967>] save_args+0x67/0x70
[ 1.731180] softirqs last enabled at (48084): [<ffffffff81042964>] __do_softirq+0x197/0x1a6
[ 1.731180] softirqs last disabled at (48067): [<ffffffff8100cd3c>] call_softirq+0x1c/0x34
[ 1.731180]
[ 1.731180] other info that might help us debug this:
[ 1.731180] no locks held by swapper/0.
[ 1.731180]
[ 1.731180] stack backtrace:
[ 1.731180] Pid: 0, comm: swapper Not tainted 2.6.29-rc8 #1 SMP Thu Mar 19 20:39:13 CET 2009
[ 1.731180] Call Trace:
[ 1.731180] <IRQ> [<ffffffff8105e8f5>] valid_state+0x179/0x18c
[ 1.731180] [<ffffffff8105e727>] ? check_usage_forwards+0x0/0x55
[ 1.731180] [<ffffffff8105e9e3>] mark_lock+0xdb/0x1ff
[ 1.731180] [<ffffffff8105f482>] __lock_acquire+0x22e/0xb61
[ 1.731180] [<ffffffff8105e92a>] ? mark_lock+0x22/0x1ff
[ 1.731180] [<ffffffff8106077c>] lock_acquire+0xbc/0xe0
[ 1.731180] [<ffffffff8101560f>] ? ds_put_context+0x21/0xf3
[ 1.731180] [<ffffffff814bb19c>] _spin_lock+0x2c/0x38
[ 1.731180] [<ffffffff8101560f>] ? ds_put_context+0x21/0xf3
[ 1.731180] [<ffffffff8101560f>] ds_put_context+0x21/0xf3
[ 1.731180] [<ffffffff810157d3>] ds_free_bts+0x73/0x7f
[ 1.731180] [<ffffffff81015822>] ds_release_bts_noirq+0x43/0x4b
[ 1.731180] [<ffffffff81016278>] ds_release_bts_noirq_wrap+0x9/0xb
[ 1.731180] [<ffffffff81065308>] generic_smp_call_function_single_interrupt+0x97/0xe3
[ 1.731180] [<ffffffff8101e18a>] smp_call_function_single_interrupt+0x13/0x23
[ 1.731180] [<ffffffff8100c8d3>] call_function_single_interrupt+0x13/0x20
[ 1.731180] <EOI> [<ffffffff814bd7db>] ? __atomic_notifier_call_chain+0x0/0x87
[ 1.731180] [<ffffffff81012827>] ? mwait_idle+0x7c/0x99
[ 1.731180] [<ffffffff8101281e>] ? mwait_idle+0x73/0x99
[ 1.731180] [<ffffffff814bd871>] ? atomic_notifier_call_chain+0xf/0x11
[ 1.731180] [<ffffffff8100a89b>] ? enter_idle+0x20/0x22
[ 1.731180] [<ffffffff8100abb9>] ? cpu_idle+0x57/0x86
[ 1.731180] [<ffffffff814b53d4>] ? start_secondary+0x18e/0x192
[ 1.742370] failed.
[ 1.742550] ------------[ cut here ]------------
thanks,
markus.
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