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Message-ID: <20180423060532.GB28534@yexl-desktop>
Date:   Mon, 23 Apr 2018 14:05:32 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Roman Gushchin <guro@...com>, Rik van Riel <riel@...riel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
        cgroups@...r.kernel.org, lkp@...org
Subject: [lkp-robot] [mm]  07f09ce017: BUG:KASAN:null-ptr-deref_in_c


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

commit: 07f09ce0175185a21865133ccd2cfd6515e24995 ("mm: memcontrol: Use cgroup_rstat for stat accounting")
https://git.kernel.org/cgit/linux/kernel/git/tj/cgroup.git review-memcg-swap.events

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu host -smp 2 -m 1G

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


+------------------------------------------+------------+------------+
|                                          | 4098f3a8ac | 07f09ce017 |
+------------------------------------------+------------+------------+
| boot_successes                           | 2          | 0          |
| boot_failures                            | 19         | 21         |
| invoked_oom-killer:gfp_mask=0x           | 17         |            |
| Mem-Info                                 | 17         |            |
| Out_of_memory:Kill_process               | 17         |            |
| BUG:kernel_in_stage                      | 2          | 2          |
| BUG:KASAN:null-ptr-deref_in_c            | 0          | 19         |
| BUG:unable_to_handle_kernel              | 0          | 19         |
| Oops:#[##]                               | 0          | 19         |
| RIP:cgroup_rstat_flush_locked            | 0          | 19         |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 19         |
+------------------------------------------+------------+------------+



[   68.759108] BUG: KASAN: null-ptr-deref in cgroup_rstat_flush_locked+0xc7/0x445
[   68.762498] Read of size 8 at addr 0000000000000030 by task kswapd0/81
[   68.765402] 
[   68.766288] CPU: 0 PID: 81 Comm: kswapd0 Not tainted 4.16.0-rc6-00088-g07f09ce #1
[   68.769615] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[   68.772859] Call Trace:
[   68.773982]  kasan_report+0x21d/0x24d
[   68.775869]  cgroup_rstat_flush_locked+0xc7/0x445
[   68.777990]  cgroup_rstat_flush+0x30/0x3d
[   68.779821]  snapshot_refaults+0x39/0x107
[   68.781996]  kswapd+0x5bf/0x64b
[   68.783476]  ? try_to_free_mem_cgroup_pages+0x1bb/0x1bb
[   68.785779]  ? lock_downgrade+0x28a/0x28a
[   68.787441]  ? match_held_lock+0x1c/0x1e1
[   68.789078]  ? do_raw_spin_unlock+0xb2/0xbd
[   68.790783]  ? __wake_up_common_lock+0x10b/0x10b
[   68.792638]  ? sysctl_net_exit+0xf/0xf
[   68.794219]  ? try_to_free_mem_cgroup_pages+0x1bb/0x1bb
[   68.796557]  ? try_to_free_mem_cgroup_pages+0x1bb/0x1bb
[   68.798859]  kthread+0x1cd/0x1dd
[   68.800404]  ? __kthread_create_on_node+0x22f/0x22f
[   68.802656]  ret_from_fork+0x1f/0x30
[   68.804160] ==================================================================
[   68.806991] Disabling lock debugging due to kernel taint
[   68.809020] BUG: unable to handle kernel NULL pointer dereference at 0000000000000030
[   68.811985] IP: cgroup_rstat_flush_locked+0xc7/0x445
[   68.814050] PGD 0 P4D 0 
[   68.815287] Oops: 0000 [#1] PREEMPT DEBUG_PAGEALLOC KASAN PTI
[   68.817704] CPU: 0 PID: 81 Comm: kswapd0 Tainted: G    B            4.16.0-rc6-00088-g07f09ce #1
[   68.821366] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[   68.824952] RIP: 0010:cgroup_rstat_flush_locked+0xc7/0x445
[   68.827295] RSP: 0018:ffff88000d36fc70 EFLAGS: 00010056
[   68.829563] RAX: 0000000000000096 RBX: ffff8800240dc790 RCX: ffffffff8111252d
[   68.832168] RDX: ffffffff811f5c00 RSI: 0000000000000003 RDI: 0000000000000096
[   68.834795] RBP: 0000000000000000 R08: dffffc0000000000 R09: 0000000000000000
[   68.837397] R10: fffffbfff08fbb46 R11: fffffbfff0ac139f R12: ffffffff844ef720
[   68.840007] R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000001
[   68.842600] FS:  0000000000000000(0000) GS:ffffffff83a75000(0000) knlGS:0000000000000000
[   68.845964] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   68.848372] CR2: 0000000000000030 CR3: 000000000d71c000 CR4: 00000000000006f0
[   68.851200] Call Trace:
[   68.852386]  cgroup_rstat_flush+0x30/0x3d
[   68.854170]  snapshot_refaults+0x39/0x107
[   68.855749]  kswapd+0x5bf/0x64b
[   68.857064]  ? try_to_free_mem_cgroup_pages+0x1bb/0x1bb
[   68.859300]  ? lock_downgrade+0x28a/0x28a
[   68.861099]  ? match_held_lock+0x1c/0x1e1
[   68.862875]  ? do_raw_spin_unlock+0xb2/0xbd
[   68.864760]  ? __wake_up_common_lock+0x10b/0x10b
[   68.866644]  ? sysctl_net_exit+0xf/0xf
[   68.868356]  ? try_to_free_mem_cgroup_pages+0x1bb/0x1bb
[   68.870480]  ? try_to_free_mem_cgroup_pages+0x1bb/0x1bb
[   68.872466]  kthread+0x1cd/0x1dd
[   68.873820]  ? __kthread_create_on_node+0x22f/0x22f
[   68.875675]  ret_from_fork+0x1f/0x30
[   68.877120] Code: 48 8b 98 e0 00 00 00 48 8d 83 70 02 00 00 48 89 c7 48 89 44 24 10 e8 c1 e0 09 00 48 8b ab 70 02 00 00 48 8d 7d 30 e8 b1 e0 09 00 <48> 8b 45 30 48 39 c3 48 89 04 24 74 06 48 8b 1c 24 eb c9 48 8d 
[   68.884035] RIP: cgroup_rstat_flush_locked+0xc7/0x445 RSP: ffff88000d36fc70
[   68.886870] CR2: 0000000000000030
[   68.888387] ---[ end trace 9edd9c01f8506185 ]---


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,
Xiaolong

View attachment "config-4.16.0-rc6-00088-g07f09ce" of type "text/plain" (134101 bytes)

View attachment "job-script" of type "text/plain" (4185 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (18048 bytes)

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