RHEL 6 において nfs_access_free_entry の 'put_rpccred+0x13a/0x150 [sunrpc]' でカーネルパニックが発生する

Issue

• RHEL 6.3 の put_rpccred+0x13a/0x150 [sunrpc] でカーネルパニックが発生し、以下のトレースが生成されます。

general protection fault:0000 [#1] SMP
last sysfs file:/sys/devices/pci0000:00/0000:00:06.0/local_cpus
CPU 1
Modules linked in: bridge stp llc autofs4 nfs lockd fscache nfs_acl auth_rpcgss sunrpc ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 iptable_filter ip_tables ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_conntrack ip6table_filter ip6_tables ipv6 sg microcode virtio_console virtio_net i2c_piix4 i2c_core ext4 mbcache jbd2 virtio_blk sr_mod cdrom virtio_pci virtio_ring virtio pata_acpi ata_generic ata_piix dm_mirror dm_region_hash dm_log dm_mod [last unloaded: speedstep_lib]

Pid:58, comm: kswapd0 Not tainted 2.6.32-279.5.2.el6.x86_64 #1 Red Hat RHEV Hypervisor
RIP:0010:[<ffffffffa02454aa>]  [<ffffffffa02454aa>] put_rpccred+0x13a/0x150 [sunrpc]
RSP:0018:ffff88060bd11be0  EFLAGS:00010202
RAX:6c6d74682e335f64 RBX: ffff880384acc5c0 RCX:00000000fffffffb
RDX: dead000000100100 RSI: ffffffffa0264668 RDI: ffff880384acc5c0
RBP: ffff88060bd11bf0 R08: ffff88060ed9aad8 R09: fb0c53de8b39b807
R10:0000000000000000 R11:0000000000000000 R12: ffff88060ed9aac0
R13: ffff88017505b3a8 R14: ffff88017503fda8 R15:0000000000000000
FS:0000000000000000(0000) GS:ffff880028280000(0000) knlGS:0000000000000000
CS:0010 DS:0018 ES:0018 CR0:000000008005003b
CR2:0000003f9143e6d0 CR3:00000000d8caa000 CR4:00000000000006e0
DR0:0000000000000000 DR1:0000000000000000 DR2:0000000000000000
DR3:0000000000000000 DR6:00000000ffff4ff0 DR7:0000000000000400
Process kswapd0 (pid:58, threadinfo ffff88060bd10000, task ffff88060bcbf500)
Stack:
 ffff88060ed9aac0 ffff88060ed9aac0 ffff88060bd11c10 ffffffffa02e23ea
<d> ffff88060bd11c40 ffff88060bd11c50 ffff88060bd11c30 ffffffffa02e2c91
<d> ffff88017503fb30 ffff88017505b2c0 ffff88060bd11c90 ffffffffa02e2e6e
Call Trace:
 [<ffffffffa02e23ea>] nfs_access_free_entry+0x1a/0x40 [nfs]
 [<ffffffffa02e2c91>] nfs_access_free_list+0x31/0x40 [nfs]
 [<ffffffffa02e2e6e>] nfs_access_cache_shrinker+0x1ce/0x210 [nfs]
 [<ffffffff8112d30a>] shrink_slab+0x12a/0x1a0
 [<ffffffff811301ed>] balance_pgdat+0x57d/0x7e0
 [<ffffffff81130800>] ? isolate_pages_global+0x0/0x350
 [<ffffffff81137166>] ? set_pgdat_percpu_threshold+0xa6/0xd0
 [<ffffffff81130586>] kswapd+0x136/0x3b0
 [<ffffffff810920d0>] ? autoremove_wake_function+0x0/0x40
 [<ffffffff81130450>] ? kswapd+0x0/0x3b0
 [<ffffffff81091d66>] kthread+0x96/0xa0
 [<ffffffff8100c14a>] child_rip+0xa/0x20
 [<ffffffff81091cd0>] ? kthread+0x0/0xa0
 [<ffffffff8100c140>] ? child_rip+0x0/0x20
Code: de 48 89 53 08 f0 80 63 50 fb 4c 89 e2 c7 02 00 00 00 00 85 c0 74 8c 48 c7 c0 68 46 26 a0 c7 00 00 00 00 00 48 8b 43 38 48 89 df <ff> 50 10 48 8b 1c 24 4c 8b 64 24 08 c9 c3 0f 1f 84 00 00 00 00
RIP  [<ffffffffa02454aa>] put_rpccred+0x13a/0x150 [sunrpc]
 RSP <ffff88060bd11be0>