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Date:	Mon, 10 Nov 2014 13:40:26 +0800
From:	lkp@...org
To:	Jeff Layton <jlayton@...marydata.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, lkp@...org,
	Yuanhan Liu <yuanhan.liu@...ux.intel.com>
Subject: [LKP] [sunrpc] WARNING: CPU: 1 PID: 1890 at lib/list_debug.c:36
 __list_add+0xcb/0xd0()

FYI, we noticed a wraning changes on

git://git.samba.org/jlayton/linux svc-pool-lock
commit 3a41085d37f2374f6ae6539f5dca3d1d53e50431 ("sunrpc: search for a thread under RCU")

<5>[   21.635477] Key type id_legacy registered
<4>[   21.638149] ------------[ cut here ]------------
<4>[   21.638359] ------------[ cut here ]------------
<4>[   21.638363] WARNING: CPU: 1 PID: 1890 at lib/list_debug.c:36 __list_add+0xcb/0xd0()
<4>[   21.638364] list_add double add: new=ffff88007be38000, prev=ffff88007e835088, next=ffff88007be38000.
<4>[   21.638376] Modules linked in: rpcsec_gss_krb5 nfsv4 dns_resolver nfsd auth_rpcgss ipmi_watchdog ipmi_msghandler sg sr_mod sd_mod cdrom ata_generic pata_acpi mxm_wmi pcspkr pata_marvell serio_raw firewire_ohci firewire_core ahci libahci crc_itu_t i2c_i801 libata parport_pc winbond_cir parport rc_core snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_pcm snd_timer snd wmi i7core_edac soundcore edac_core acpi_cpufreq
<4>[   21.638377] CPU: 1 PID: 1890 Comm: nfsv4.0-svc Tainted: G          I    3.18.0-rc3-ga798bc5 #1
<4>[   21.638378] Hardware name:                  /DX58SO, BIOS SOX5810J.86A.4196.2009.0715.1958 07/15/2009
<4>[   21.638380]  0000000000000009 ffff88007bd03d48 ffffffff8188f71f 0000000025a825a8
<4>[   21.638381]  ffff88007bd03d98 ffff88007bd03d88 ffffffff8106b3c1 ffff8800bf7c1b00
<4>[   21.638381]  ffff88007be38000 ffff88007be38000 ffff88007e835088 ffff88007e835098
<4>[   21.638382] Call Trace:
<4>[   21.638385]  [<ffffffff8188f71f>] dump_stack+0x4e/0x68
<4>[   21.638388]  [<ffffffff8106b3c1>] warn_slowpath_common+0x81/0xa0
<4>[   21.638389]  [<ffffffff8106b426>] warn_slowpath_fmt+0x46/0x50
<4>[   21.638390]  [<ffffffff8141932b>] __list_add+0xcb/0xd0
<4>[   21.638392]  [<ffffffff8186c0da>] svc_recv+0x69a/0xa30
<4>[   21.638399]  [<ffffffffa0270580>] ? nfs_callback_authenticate+0x50/0x50 [nfsv4]
<4>[   21.638406]  [<ffffffffa0270580>] ? nfs_callback_authenticate+0x50/0x50 [nfsv4]
<4>[   21.638412]  [<ffffffffa02705bb>] nfs4_callback_svc+0x3b/0x60 [nfsv4]
<4>[   21.638414]  [<ffffffff8108ac0b>] kthread+0xdb/0x100
<4>[   21.638415]  [<ffffffff8108ab30>] ? kthread_create_on_node+0x180/0x180
<4>[   21.638417]  [<ffffffff81897afc>] ret_from_fork+0x7c/0xb0
<4>[   21.638418]  [<ffffffff8108ab30>] ? kthread_create_on_node+0x180/0x180
<4>[   21.638419] ---[ end trace a8ecfce57c7c54ab ]---
<4>[   21.646613] WARNING: CPU: 2 PID: 1876 at lib/list_debug.c:36 __list_add+0xcb/0xd0()

View attachment "dmesg" of type "text/plain" (44065 bytes)

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