linux-kernel - [torture] 345fdd0aab: WARNING:at_kernel/rcu/rcutorture.c:#rcu_torture_fwd_prog

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Message-ID: <20200907084447.GJ31308@shao2-debian>
Date:   Mon, 7 Sep 2020 16:44:47 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        lkp@...el.com
Subject: [torture] 345fdd0aab:
 WARNING:at_kernel/rcu/rcutorture.c:#rcu_torture_fwd_prog_nr

Greeting,

FYI, we noticed the following commit (built with gcc-9):

commit: 345fdd0aabfa4aaa469e782ada7c26e29dd61c7f ("torture: Make torture_stutter() use hrtimer")
https://git.kernel.org/cgit/linux/kernel/git/paulmck/linux-rcu.git rcu/next


in testcase: trinity
version: 
with following parameters:

	runtime: 300s

test-description: Trinity is a linux system call fuzz tester.
test-url: http://codemonkey.org.uk/projects/trinity/


on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 8G

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


+-------------------------------------------------------------+------------+------------+
|                                                             | a6afecad1b | 345fdd0aab |
+-------------------------------------------------------------+------------+------------+
| boot_successes                                              | 4          | 0          |
| boot_failures                                               | 0          | 3          |
| WARNING:at_kernel/rcu/rcutorture.c:#rcu_torture_fwd_prog_nr | 0          | 3          |
| EIP:rcu_torture_fwd_prog_nr                                 | 0          | 3          |
+-------------------------------------------------------------+------------+------------+


If you fix the issue, kindly add following tag
Reported-by: kernel test robot <lkp@...el.com>


[   77.789569] WARNING: CPU: 0 PID: 124 at kernel/rcu/rcutorture.c:1951 rcu_torture_fwd_prog_nr+0x52c/0x625
[   77.790167] Modules linked in:
[   77.790373] CPU: 0 PID: 124 Comm: rcu_torture_fwd Not tainted 5.9.0-rc1-00146-g345fdd0aabfa4 #2
[   77.790932] EIP: rcu_torture_fwd_prog_nr+0x52c/0x625
[   77.791253] Code: e8 42 a0 ff ff 83 05 20 eb d3 83 01 83 15 24 eb d3 83 00 85 db 75 23 83 f8 01 77 1e 83 05 28 eb d3 83 01 83 15 2c eb d3 83 00 <0f> 0b 83 05 30 eb d3 83 01 83 15 34 eb d3 83 00 50 53 ff 75 e0 68
[   77.792425] EAX: 00000000 EBX: 00000000 ECX: 81123459 EDX: 00000000
[   77.792824] ESI: e5955e00 EDI: ffffa8b1 EBP: efae1f74 ESP: efae1f44
[   77.793222] DS: 007b ES: 007b FS: 0000 GS: 00e0 SS: 0068 EFLAGS: 00010246
[   77.793653] CR0: 80050033 CR2: 080a2190 CR3: 6f8d6aa0 CR4: 000406b0
[   77.794054] DR0: 76a67000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[   77.794453] DR6: fffe0ff0 DR7: 00000600
[   77.794710] Call Trace:
[   77.794880]  ? rcu_torture_fwd_cb_cr+0x1d1/0x1d1
[   77.795179]  rcu_torture_fwd_prog+0xb2/0x19b
[   77.795457]  kthread+0x2ce/0x2e1
[   77.795672]  ? rcu_torture_fwd_prog_nr+0x625/0x625
[   77.795982]  ? kthread_create_worker+0x38/0x38
[   77.796269]  ret_from_fork+0x19/0x24
[   77.796503] ---[ end trace b9e70890d3ca1c49 ]---


To reproduce:

        # build kernel
	cd linux
	cp config-5.9.0-rc1-00146-g345fdd0aabfa4 .config
	make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 olddefconfig prepare modules_prepare bzImage

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email



Thanks,
lkp


View attachment "config-5.9.0-rc1-00146-g345fdd0aabfa4" of type "text/plain" (125407 bytes)

View attachment "job-script" of type "text/plain" (4397 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (16568 bytes)

View attachment "trinity" of type "text/plain" (6067 bytes)