linux-kernel - [LKP] [rcutorture] 894b343aa8: WARNING:at_kernel/rcu/rcutorture.c:#rcu_torture_fwd

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Date:   Fri, 7 Sep 2018 11:01:56 +0800
From:   kernel test robot <rong.a.chen@...el.com>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, lkp@...org
Subject: [LKP] [rcutorture]  894b343aa8:
 WARNING:at_kernel/rcu/rcutorture.c:#rcu_torture_fwd_prog

FYI, we noticed the following commit (built with gcc-7):

commit: 894b343aa8bec5ee732329f1db09b9f5c2794de5 ("rcutorture: Add call_rcu() flooding forward-progress tests")
https://git.kernel.org/cgit/linux/kernel/git/paulmck/linux-rcu.git dev.2018.08.30a

in testcase: trinity
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-x86_64 -enable-kvm -cpu Haswell,+smep,+smap -smp 2 -m 512M

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


+------------------------------------------------------------------+------------+------------+
|                                                                  | 93fd89934b | 894b343aa8 |
+------------------------------------------------------------------+------------+------------+
| boot_successes                                                   | 24         | 18         |
| boot_failures                                                    | 1          | 12         |
| invoked_oom-killer:gfp_mask=0x                                   | 1          | 2          |
| Mem-Info                                                         | 1          | 2          |
| Out_of_memory:Kill_process                                       | 1          |            |
| Kernel_panic-not_syncing:Out_of_memory_and_no_killable_processes | 0          | 2          |
| RIP:rcu_torture_fwd_prog                                         | 0          | 10         |
| WARNING:at_kernel/rcu/rcutorture.c:#rcu_torture_fwd_prog         | 0          | 9          |
+------------------------------------------------------------------+------------+------------+



[  307.810166] WARNING: CPU: 1 PID: 54 at kernel/rcu/rcutorture.c:1840 rcu_torture_fwd_prog+0x41f/0x542
[  307.832010] Modules linked in:
[  307.837737] CPU: 1 PID: 54 Comm: rcu_torture_fwd Tainted: G                T 4.19.0-rc1-00151-g894b343 #1
[  307.856076] RIP: 0010:rcu_torture_fwd_prog+0x41f/0x542
[  307.866058] Code: b8 0e 00 eb e2 48 c7 05 c9 25 35 01 f0 fa 78 83 c6 05 92 99 67 02 00 e8 29 6c 09 00 84 c0 0f 85 af 00 00 00 49 83 fc 63 7f 02 <0f> 0b 48 8b 45 88 4f 8d 44 3d 00 4d 89 e9 48 c7 c6 a0 34 e2 81 48
[  307.902163] RSP: 0018:ffff88000c1cbe80 EFLAGS: 00010293
[  307.912698] RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff88001046c080
[  307.926369] RDX: 0000000000000017 RSI: ffffffff811c173d RDI: ffff88001046c080
[  307.940082] RBP: ffff88000c1cbf00 R08: 0000000000000020 R09: ffff8800053e4ce0
[  307.953984] R10: ffff8800053e4260 R11: ffff8800053e4d40 R12: 0000000000000000
[  307.968462] R13: 0000000000000003 R14: 0000000000000000 R15: 0000000000000083
[  307.982466] FS:  0000000000000000(0000) GS:ffff88001c400000(0000) knlGS:0000000000000000
[  307.998082] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  308.009554] CR2: 00007ffc7538e000 CR3: 0000000002411004 CR4: 00000000000206a0
[  308.023264] Call Trace:
[  308.028512]  ? _raw_spin_unlock_irqrestore+0x45/0x4f
[  308.038529]  ? rcu_torture_stall+0x12d/0x12d
[  308.047149]  ? kthread+0x114/0x123
[  308.054115]  ? kthread+0x114/0x123
[  308.060625]  ? kthread_create_worker_on_cpu+0x5f/0x5f
[  308.069703]  ? ret_from_fork+0x3a/0x50
[  308.076537] irq event stamp: 3048
[  308.082507] hardirqs last  enabled at (3047): [<ffffffff81216404>] kfree+0x125/0x136
[  308.097831] hardirqs last disabled at (3048): [<ffffffff810036a6>] trace_hardirqs_off_thunk+0x1a/0x1c
[  308.115656] softirqs last  enabled at (56): [<ffffffff81c00359>] __do_softirq+0x359/0x39b
[  308.130979] softirqs last disabled at (49): [<ffffffff810cd5d1>] irq_exit+0x59/0x75
[  308.145115] ---[ end trace 3654c8b0e1b99cb1 ]---


To reproduce:

        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,
Rong, Chen

View attachment "config-4.19.0-rc1-00151-g894b343" of type "text/plain" (120390 bytes)

View attachment "job-script" of type "text/plain" (3881 bytes)

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