linux-kernel - WARNING: CPU: 8 PID: 12860 at net/core/sock.c:313 sk_clear

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Message-ID: <988917896.22733181.1384226183266.JavaMail.root@redhat.com>
Date:	Mon, 11 Nov 2013 22:16:23 -0500 (EST)
From:	Zhouping Liu <zliu@...hat.com>
To:	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>
Cc:	Mel Gorman <mgorman@...e.de>
Subject: WARNING: CPU: 8 PID: 12860 at net/core/sock.c:313
 sk_clear_memalloc+0x49/0x70()

Hi All,

I found the WARNING in the latest mainline with commint 8b5baa460b.

[61323.305424] ------------[ cut here ]------------
[61323.310562] WARNING: CPU: 8 PID: 12860 at net/core/sock.c:313 sk_clear_memalloc+0x49/0x70()
[61323.319779] Modules linked in: rpcsec_gss_krb5 nfsv4 dns_resolver nfs fscache sg nfsd netxen_nic hpilo sp5100_tco auth_rpcgss hpwdt amd64_edac_mod edac_mce_amd microcode pcspkr shpchp serio_raw i2c_piix4 edac_core ipmi_si k10temp nfs_acl lockd ipmi_msghandler acpi_power_meter acpi_cpufreq sunrpc xfs libcrc32c radeon i2c_algo_bit drm_kms_helper ttm sd_mod crc_t10dif ata_generic crct10dif_common drm pata_acpi ahci libahci pata_atiixp libata i2c_core hpsa dm_mirror dm_region_hash dm_log dm_mod
[61323.368625] CPU: 8 PID: 12860 Comm: swapoff Not tainted 3.12.0+ #1
[61323.375452] Hardware name: HP ProLiant DL585 G7, BIOS A16 12/17/2012
[61323.382463]  0000000000000009 ffff882dfce43e68 ffffffff816204b7 0000000000000000
[61323.390692]  ffff882dfce43ea0 ffffffff8106495d ffff88190b551d00 ffff88080ff0b600
[61323.398940]  ffff88080ff0b650 0000000000000001 ffff880810fe64a0 ffff882dfce43eb0
[61323.407188] Call Trace:
[61323.409916]  [] dump_stack+0x45/0x56
[61323.415616]  [] warn_slowpath_common+0x7d/0xa0
[61323.422257]  [] warn_slowpath_null+0x1a/0x20
[61323.428705]  [] sk_clear_memalloc+0x49/0x70
[61323.435094]  [] xs_swapper+0x41/0x60 [sunrpc]
[61323.441671]  [] nfs_swap_deactivate+0x2d/0x30 [nfs]
[61323.448796]  [] destroy_swap_extents+0x61/0x70
[61323.455436]  [] SyS_swapoff+0x220/0x610
[61323.461420]  [] ? do_page_fault+0x1a/0x70
[61323.467582]  [] system_call_fastpath+0x16/0x1b
[61323.474215] ---[ end trace 919f685513b38356 ]---

I found the warning during doing swapoff the swap over NFS mount, so if you need to reproduce it,
you should do the following:
1. Open CONFIG_NFS_SWAP in testing machine
2. Create a NFS server, and create a swap file in NFS server
   in NFS server: # dd if=/dev/zero of=/NFS_FOLDER/swapfile bs=1M count=1024; mkswap swapfile
3. Inside testing machine, setup a swap over NFS, then swapoff it, the swapoff action will
   trigger the WARNING.

-- 
Thanks,
Zhouping
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