linux-kernel - [pidns] d814d62496: WARNING:at_kernel/cgroup/cgroup.c:#cgroup

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Message-ID: <20170607041137.GA30804@inn.lkp.intel.com>
Date:   Wed, 7 Jun 2017 12:11:38 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        containers@...ts.linux-foundation.org,
        "Eric W. Biederman" <ebiederm@...ssion.com>, lkp@...org
Subject: [pidns]  d814d62496: WARNING:at_kernel/cgroup/cgroup.c:#cgroup_mount


FYI, we noticed the following commit:

commit: d814d6249645f58d7399beecd9c735a71f1a1170 ("pidns: Make the list of processes per pid namespace")
https://git.kernel.org/cgit/linux/kernel/git/ebiederm/user-namespace.git exit-cleanups-for-testing

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu IvyBridge -smp 4 -m 2G

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


+-------------------------------------------------+------------+------------+
|                                                 | c3a14a0eff | d814d62496 |
+-------------------------------------------------+------------+------------+
| boot_successes                                  | 6          | 2          |
| boot_failures                                   | 2          | 6          |
| BUG:kernel_hang_in_test_stage                   | 2          |            |
| WARNING:at_kernel/cgroup/cgroup.c:#cgroup_mount | 0          | 6          |
+-------------------------------------------------+------------+------------+



[   19.684052] WARNING: CPU: 0 PID: 1 at kernel/cgroup/cgroup.c:1580 cgroup_mount+0xf6/0x231
[   19.686440] Modules linked in:
[   19.687350] CPU: 0 PID: 1 Comm: systemd Not tainted 4.12.0-rc2-00168-gd814d624 #251
[   19.689332] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
[   19.691723] task: ffff9ce21b54c040 task.stack: ffffc0530062c000
[   19.693227] RIP: 0010:cgroup_mount+0xf6/0x231
[   19.694390] RSP: 0018:ffffc0530062fdd8 EFLAGS: 00010086
[   19.695709] RAX: 0000000000000000 RBX: ffffffff9c033500 RCX: ffffffff9c084dc0
[   19.697449] RDX: ffffffff9c033a20 RSI: ffffffff9c084560 RDI: ffffffff9c033888
[   19.699128] RBP: ffffc0530062fe18 R08: 0000000000000000 R09: ffffffff9b9fe2b5
[   19.700868] R10: ffffc0530062fd40 R11: 0000000000000001 R12: ffffffff9c0ab0a0
[   19.702517] R13: ffff9ce1fc376f40 R14: ffffffff9c033500 R15: ffff9ce1fb47c000
[   19.704112] FS:  00007f18fc12c900(0000) GS:ffff9ce21c600000(0000) knlGS:0000000000000000
[   19.706201] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   19.707585] CR2: 00007f18fbe48120 CR3: 000000007c29c000 CR4: 00000000001406f0
[   19.709341] Call Trace:
[   19.710155]  mount_fs+0x67/0x114
[   19.711073]  vfs_kern_mount+0x6b/0xdb
[   19.712175]  do_mount+0x6f3/0x95e
[   19.713159]  SyS_mount+0x77/0x9f
[   19.714131]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   19.715340] RIP: 0033:0x7f18fa71598a
[   19.716415] RSP: 002b:00007ffc595e4658 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
[   19.718404] RAX: ffffffffffffffda RBX: ffffffff991254e2 RCX: 00007f18fa71598a
[   19.720153] RDX: 000055a720ec1b0b RSI: 000055a720ec2db7 RDI: 000055a720ec1b0b
[   19.721845] RBP: ffffc0530062ff98 R08: 000055a720ec2dce R09: 0000000000001011
[   19.723534] R10: 000000000000000e R11: 0000000000000246 R12: 0000000000000046
[   19.725280] R13: 000055a7223399d0 R14: 0000000000000400 R15: 0000000000000000
[   19.726974]  ? trace_hardirqs_off_caller+0x3f/0xa1
[   19.728287] Code: 8d 93 20 05 00 00 48 83 c0 10 48 39 c2 0f 84 9b 00 00 00 48 8d 83 a0 13 00 00 48 89 45 c0 48 8b 83 a0 13 00 00 48 39 45 c0 74 04 <0f> ff eb 10 48 89 df e8 e3 d6 ff ff 48 3d e0 ae 0a 9c 75 ec 48 
[   19.732875] ---[ end trace 77ac1660a4326066 ]---


To reproduce:

        git clone https://github.com/01org/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script  # job-script is attached in this email



Thanks,
Kernel Test Robot

View attachment "config-4.12.0-rc2-00168-gd814d624" of type "text/plain" (160196 bytes)

View attachment "job-script" of type "text/plain" (4286 bytes)

Download attachment "dmesg.xz" of type "application/octet-stream" (30432 bytes)