From: Fengguang Wu <fengguang.wu@intel.com>
To: Davidlohr Bueso <dave@stgolabs.net>
Cc: Chris Wilson <chris@chris-wilson.co.uk>,
linux-kernel@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [interval_tree_test_init] BUG: soft lockup - CPU#0 stuck for 23s! [swapper/0:1]
Date: Wed, 8 Nov 2017 15:26:30 +0800 [thread overview]
Message-ID: <20171108072630.slkrvukmhmkx6igd@wfg-t540p.sh.intel.com> (raw)
In-Reply-To: <20171107165814.4re77faitdlqsqtn@linux-n805>
On Tue, Nov 07, 2017 at 08:58:14AM -0800, Davidlohr Bueso wrote:
>On Tue, 07 Nov 2017, Fengguang Wu wrote:
>
>>[ 265.102312] xz_dec_test: module loaded
>>[ 265.111774] xz_dec_test: Create a device node with 'mknod xz_dec_test c 246 0' and write .xz files to it.
>>[ 265.160320] atomic64_test: passed for x86-64 platform with CX8 and with SSE
>>[ 265.181966] glob: 64 self-tests passed, 0 failed
>>[ 265.196996] interval tree insert/remove
>>[ 292.348094] watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [swapper/0:1]
>>[ 292.348094] irq event stamp: 6190340
>>[ 292.396418] hardirqs last enabled at (6190339): [<ffffffff81fb006b>] restore_regs_and_iret+0x0/0x1d
>>[ 292.396418] hardirqs last disabled at (6190340): [<ffffffff81fb0cb8>] apic_timer_interrupt+0x98/0xb0
>>[ 292.396418] softirqs last enabled at (6182242): [<ffffffff81fb2942>] __do_softirq+0x382/0x3f7
>>[ 292.396418] softirqs last disabled at (6182235): [<ffffffff810b6696>] irq_exit+0x51/0x7b
>>[ 292.396418] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.14.0-rc8 #40
>>[ 292.396418] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
>>[ 292.396418] task: ffff880072bf4040 task.stack: ffffc9000031c000
>>[ 292.396418] RIP: 0010:interval_tree_insert+0x4c/0xd4
>
>That would be:
>
> for (i = 0; i < perf_loops; i++) {
> for (j = 0; j < nnodes; j++)
> interval_tree_insert(nodes + j, &root);
> for (j = 0; j < nnodes; j++)
> interval_tree_remove(nodes + j, &root);
> }
>
>Which if you are using the default params would end up doing insert() 10 million times.
>How about decrementing perf_loops, it's pretty high.
It works! Thank you!
Tested-by: Fengguang Wu <fengguang.wu@intel.com>
Fengguang
>diff --git a/lib/interval_tree_test.c b/lib/interval_tree_test.c
>index 0e343fd29570..1dbdf3704247 100644
>--- a/lib/interval_tree_test.c
>+++ b/lib/interval_tree_test.c
>@@ -11,7 +11,7 @@
> MODULE_PARM_DESC(name, msg);
>
> __param(int, nnodes, 100, "Number of nodes in the interval tree");
>-__param(int, perf_loops, 100000, "Number of iterations modifying the tree");
>+__param(int, perf_loops, 1000, "Number of iterations modifying the tree");
>
> __param(int, nsearches, 100, "Number of searches to the interval tree");
> __param(int, search_loops, 10000, "Number of iterations searching the tree");
>
>If that works I guess we'd have to limit the max values for such parameters
>to avoid soft lockups. The same applies to your rbtree test report.
>
>Thanks,
>Davidlohr
>
next prev parent reply other threads:[~2017-11-08 7:26 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-07 4:41 [interval_tree_test_init] BUG: soft lockup - CPU#0 stuck for 23s! [swapper/0:1] Fengguang Wu
2017-11-07 16:58 ` Davidlohr Bueso
2017-11-08 7:26 ` Fengguang Wu [this message]
2017-11-09 16:17 ` Davidlohr Bueso
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