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Message-ID: <526BB98B.4070207@alibaba-inc.com>
Date: Sat, 26 Oct 2013 20:46:03 +0800
From: 含黛 <handai.szj@...baba-inc.com>
To: Johannes Weiner <hannes@...xchg.org>
CC: Flavio Leitner <fbl@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Sha Zhengju <handai.szj@...bao.com>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Subject: Re: RIP: mem_cgroup_move_account+0xf4/0x290
On 10/26/2013 11:39 AM, Johannes Weiner wrote:
> On Fri, Oct 25, 2013 at 02:15:55PM -0200, Flavio Leitner wrote:
>> While playing with guests and net-next kernel, I've triggered
>> this with some frequency. Even Fedora 19 kernel reproduces.
>>
>> It it a known issue?
>>
>> Thanks,
>> fbl
>>
>> [ 6790.349763] kvm: zapping shadow pages for mmio generation wraparound
>> [ 6792.283879] kvm: zapping shadow pages for mmio generation wraparound
>> [ 7535.654438] perf samples too long (2719 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
>> [ 7535.665948] INFO: NMI handler (perf_event_nmi_handler) took too long to run: 11.560 msecs
>> [ 7691.048392] virbr0: port 1(vnet0) entered disabled state
>> [ 7691.056281] device vnet0 left promiscuous mode
>> [ 7691.061674] virbr0: port 1(vnet0) entered disabled state
>> [ 7691.163363] BUG: unable to handle kernel paging request at 000060fbc0002a20
>> [ 7691.171145] IP: [<ffffffff8119dcb4>] mem_cgroup_move_account+0xf4/0x290
>> [ 7691.178574] PGD 0
>> [ 7691.181042] Oops: 0000 [#1] SMP
>> [ 7691.184761] Modules linked in: vhost_net vhost macvtap macvlan tun veth openvswitch xt_CHECKSUM nf_conntrack_netbios_ns nf_conntrack_broadcast ipt_MASQUERADE ip6t_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 vxlan ip_tunnel gre libcrc32c ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw coretemp kvm_intel snd_hda_codec_realtek snd_hda_intel nfsd snd_hda_codec kvm auth_rpcgss nfs_acl snd_hwdep lockd snd_seq snd_seq_device snd_pcm e1000e snd_page_alloc sunrpc snd_timer crc32c_intel i7core_edac bnx2 shpchp ptp snd iTCO_wdt joydev pps_core iTCO_vendor_support pcspkr soundcore microcode serio_raw lpc_ich edac_core mfd_core i2c_i801 acpi_cpufreq hid_logitech_dj nouveau ata_generic pata_acpi video i2c_algo_bit drm_kms_helper ttm drm mxm_wmi i2c_core pata_marvell wmi [last unloaded: openvswitch]
>> [ 7691.285989] CPU: 1 PID: 14 Comm: kworker/1:0 Tainted: G I 3.12.0-rc6-01188-gb45bd46 #1
>> [ 7691.295779] Hardware name: /DX58SO, BIOS SOX5810J.86A.5599.2012.0529.2218 05/29/2012
>> [ 7691.306066] Workqueue: events css_killed_work_fn
>> [ 7691.311303] task: ffff880429555dc0 ti: ffff88042957a000 task.ti: ffff88042957a000
>> [ 7691.319673] RIP: 0010:[<ffffffff8119dcb4>] [<ffffffff8119dcb4>] mem_cgroup_move_account+0xf4/0x290
>> [ 7691.329728] RSP: 0018:ffff88042957bcc8 EFLAGS: 00010002
>> [ 7691.335747] RAX: 0000000000000246 RBX: ffff88042b17bc30 RCX: 0000000000000004
>> [ 7691.343720] RDX: ffff880424cd6000 RSI: 000060fbc0002a08 RDI: ffff880424cd622c
>> [ 7691.351735] RBP: ffff88042957bd20 R08: ffff880424cd4000 R09: 0000000000000001
>> [ 7691.359751] R10: 0000000000000001 R11: 0000000000000001 R12: ffffea00103ef0c0
>> [ 7691.367745] R13: ffff880424cd6000 R14: 0000000000000000 R15: ffff880424cd622c
>> [ 7691.375738] FS: 0000000000000000(0000) GS:ffff88043fc20000(0000) knlGS:0000000000000000
>> [ 7691.384755] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
>> [ 7691.391238] CR2: 000060fbc0002a20 CR3: 0000000001c0c000 CR4: 00000000000027e0
>> [ 7691.399235] Stack:
>> [ 7691.401672] ffff88042957bce8 ffff88042957bce8 ffffffff81312b6d ffff880424cd4000
>> [ 7691.409968] ffff880400000001 ffff880424cd6000 ffffea00103ef0c0 ffff880424cd0430
>> [ 7691.418264] ffff88042b17bc30 ffffea00103ef0e0 ffff880424cd6000 ffff88042957bda8
>> [ 7691.426578] Call Trace:
>> [ 7691.429513] [<ffffffff81312b6d>] ? list_del+0xd/0x30
>> [ 7691.435250] [<ffffffff8119f5e7>] mem_cgroup_reparent_charges+0x247/0x460
>> [ 7691.442874] [<ffffffff8119f9af>] mem_cgroup_css_offline+0xaf/0x1b0
>> [ 7691.449942] [<ffffffff810da877>] offline_css+0x27/0x50
>> [ 7691.455874] [<ffffffff810dcf8d>] css_killed_work_fn+0x2d/0xa0
>> [ 7691.462466] [<ffffffff810821f5>] process_one_work+0x175/0x430
>> [ 7691.469041] [<ffffffff81082e1b>] worker_thread+0x11b/0x3a0
>> [ 7691.475345] [<ffffffff81082d00>] ? rescuer_thread+0x340/0x340
>> [ 7691.481919] [<ffffffff81089860>] kthread+0xc0/0xd0
>> [ 7691.487478] [<ffffffff810897a0>] ? insert_kthread_work+0x40/0x40
>> [ 7691.494352] [<ffffffff8166ea3c>] ret_from_fork+0x7c/0xb0
>> [ 7691.500464] [<ffffffff810897a0>] ? insert_kthread_work+0x40/0x40
>> [ 7691.507335] Code: 85 f6 48 8b 55 d0 44 8b 4d c8 4c 8b 45 c0 0f 85 b3 00 00 00 41 8b 4c 24 18 85 c9 0f 88 a6 00 00 00 48 8b b2 30 02 00 00 45 89 ca <4c> 39 56 18 0f 8c 36 01 00 00 44 89 c9 f7 d9 89 cf 65 48 01 7e
> This is
>
> All code
> ========
> 0: 85 f6 test %esi,%esi
> 2: 48 8b 55 d0 mov -0x30(%rbp),%rdx
> 6: 44 8b 4d c8 mov -0x38(%rbp),%r9d
> a: 4c 8b 45 c0 mov -0x40(%rbp),%r8
> e: 0f 85 b3 00 00 00 jne 0xc7
> 14: 41 8b 4c 24 18 mov 0x18(%r12),%ecx
> 19: 85 c9 test %ecx,%ecx
> 1b: 0f 88 a6 00 00 00 js 0xc7
> 21: 48 8b b2 30 02 00 00 mov 0x230(%rdx),%rsi
> 28: 45 89 ca mov %r9d,%r10d
> 2b:* 4c 39 56 18 cmp %r10,0x18(%rsi) <-- trapping instruction
> 2f: 0f 8c 36 01 00 00 jl 0x16b
> 35: 44 89 c9 mov %r9d,%ecx
> 38: f7 d9 neg %ecx
> 3a: 89 cf mov %ecx,%edi
> 3c: 65 gs
> 3d: 48 rex.W
> 3e: 01 .byte 0x1
> 3f: 7e .byte 0x7e
>
> which corresponds to
>
> WARN_ON_ONCE(from->stat->count[idx] < nr_pages);
>
> Humm. from->stat is a percpu pointer... This patch should fix it:
>
> ---
> From 4e9fe9d7e8502eab1c8bb4761de838f61cd4a8e0 Mon Sep 17 00:00:00 2001
> From: Johannes Weiner <hannes@...xchg.org>
> Date: Fri, 25 Oct 2013 23:23:31 -0400
> Subject: [patch] mm: memcg: fix percpu variable access crash
>
> 3ea67d06e467 ("memcg: add per cgroup writeback pages accounting")
> added a WARN_ON_ONCE() to sanity check the page statistics counter
> when moving charges. Unfortunately, it dereferences the percpu
> counter directly, which may result in a crash like this:
>
> [ 7691.163363] BUG: unable to handle kernel paging request at 000060fbc0002a20
> [ 7691.171145] IP: [<ffffffff8119dcb4>] mem_cgroup_move_account+0xf4/0x290
> [ 7691.178574] PGD 0
> [ 7691.181042] Oops: 0000 [#1] SMP
> [...]
> [ 7691.285989] CPU: 1 PID: 14 Comm: kworker/1:0 Tainted: G I 3.12.0-rc6-01188-gb45bd46 #1
> [ 7691.295779] Hardware name: /DX58SO, BIOS SOX5810J.86A.5599.2012.0529.2218 05/29/2012
> [ 7691.306066] Workqueue: events css_killed_work_fn
> [ 7691.311303] task: ffff880429555dc0 ti: ffff88042957a000 task.ti: ffff88042957a000
> [ 7691.319673] RIP: 0010:[<ffffffff8119dcb4>] [<ffffffff8119dcb4>] mem_cgroup_move_account+0xf4/0x290
> [ 7691.329728] RSP: 0018:ffff88042957bcc8 EFLAGS: 00010002
> [ 7691.335747] RAX: 0000000000000246 RBX: ffff88042b17bc30 RCX: 0000000000000004
> [ 7691.343720] RDX: ffff880424cd6000 RSI: 000060fbc0002a08 RDI: ffff880424cd622c
> [ 7691.351735] RBP: ffff88042957bd20 R08: ffff880424cd4000 R09: 0000000000000001
> [ 7691.359751] R10: 0000000000000001 R11: 0000000000000001 R12: ffffea00103ef0c0
> [ 7691.367745] R13: ffff880424cd6000 R14: 0000000000000000 R15: ffff880424cd622c
> [ 7691.375738] FS: 0000000000000000(0000) GS:ffff88043fc20000(0000) knlGS:0000000000000000
> [ 7691.384755] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [ 7691.391238] CR2: 000060fbc0002a20 CR3: 0000000001c0c000 CR4: 00000000000027e0
> [ 7691.399235] Stack:
> [ 7691.401672] ffff88042957bce8 ffff88042957bce8 ffffffff81312b6d ffff880424cd4000
> [ 7691.409968] ffff880400000001 ffff880424cd6000 ffffea00103ef0c0 ffff880424cd0430
> [ 7691.418264] ffff88042b17bc30 ffffea00103ef0e0 ffff880424cd6000 ffff88042957bda8
> [ 7691.426578] Call Trace:
> [ 7691.429513] [<ffffffff81312b6d>] ? list_del+0xd/0x30
> [ 7691.435250] [<ffffffff8119f5e7>] mem_cgroup_reparent_charges+0x247/0x460
> [ 7691.442874] [<ffffffff8119f9af>] mem_cgroup_css_offline+0xaf/0x1b0
> [ 7691.449942] [<ffffffff810da877>] offline_css+0x27/0x50
> [ 7691.455874] [<ffffffff810dcf8d>] css_killed_work_fn+0x2d/0xa0
> [ 7691.462466] [<ffffffff810821f5>] process_one_work+0x175/0x430
> [ 7691.469041] [<ffffffff81082e1b>] worker_thread+0x11b/0x3a0
> [ 7691.475345] [<ffffffff81082d00>] ? rescuer_thread+0x340/0x340
> [ 7691.481919] [<ffffffff81089860>] kthread+0xc0/0xd0
> [ 7691.487478] [<ffffffff810897a0>] ? insert_kthread_work+0x40/0x40
> [ 7691.494352] [<ffffffff8166ea3c>] ret_from_fork+0x7c/0xb0
> [ 7691.500464] [<ffffffff810897a0>] ? insert_kthread_work+0x40/0x40
> [ 7691.507335] Code: 85 f6 48 8b 55 d0 44 8b 4d c8 4c 8b 45 c0 0f 85 b3 00 00 00 41 8b 4c 24 18
> 85 c9 0f 88 a6 00 00 00 48 8b b2 30 02 00 00 45 89 ca <4c> 39 56 18 0f 8c 36 01 00 00 44 89 c9
> f7 d9 89 cf 65 48 01 7e
> [ 7691.528638] RIP [<ffffffff8119dcb4>] mem_cgroup_move_account+0xf4/0x290
>
> Add the required __this_cpu_read().
Sorry for my mistake and thanks for the fix up, it looks good to me.
Reviewed-by: Sha Zhengju <handai.szj@...bao.com>
Thanks,
Sha
>
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>
> ---
> mm/memcontrol.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 4097a78..a4864b6 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -3773,7 +3773,7 @@ void mem_cgroup_move_account_page_stat(struct mem_cgroup *from,
> {
> /* Update stat data for mem_cgroup */
> preempt_disable();
> - WARN_ON_ONCE(from->stat->count[idx] < nr_pages);
> + WARN_ON_ONCE(__this_cpu_read(from->stat->count[idx]) < nr_pages);
> __this_cpu_add(from->stat->count[idx], -nr_pages);
> __this_cpu_add(to->stat->count[idx], nr_pages);
> preempt_enable();
--
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