CIFS モジュールの find_writable_file 関数で Kernel-2.6.32-220.el6 がパニックになる

Issue

• サーバーがクラッシュし、以下のクラッシュログが作成されます。

IPMI kcs interface initialized
ERST:NVRAM ERST Log Address Range is not implemented yet
CIFS VFS: server ff.29.ff.131 of type Samba 3.0.32 returned unexpected error on SMB posix open, disabling posix open support.Check if server update available.
CIFS VFS:No writable handles for inode
CIFS VFS:No writable handles for inode
CIFS VFS:No writable handles for inode
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CIFS VFS:No writable handles for inode
CIFS VFS:No writable handles for inode
CIFS VFS:No writable handles for inode
general protection fault:0000 [#1] SMP 
last sysfs file:/sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map
CPU 1 
Modules linked in: tcp_diag inet_diag ipmi_si des_generic ecb md4 nls_utf8 cifs mpt2sas scsi_transport_sas raid_class mptctl mptbase ipmi_devintf ipmi_msghandler dell_rbu ipv6 power_meter ses enclosure sg bnx2 microcode dcdbas serio_raw iTCO_wdt iTCO_vendor_support i7core_edac edac_core ext4 mbcache jbd2 sr_mod cdrom usb_storage sd_mod crc_t10dif pata_acpi ata_generic ata_piix megaraid_sas dm_mirror dm_region_hash dm_log dm_mod [last unloaded: ipmi_si]

Pid:49, comm: bdi-default Not tainted 2.6.32-220.el6.x86_64 #1 Dell Inc. PowerEdge R710/00NH4P
RIP:0010:[<ffffffffa026d69a>]  [<ffffffffa026d69a>] find_writable_file+0xaa/0x190 [cifs]
RSP:0018:ffff88106c141ae0  EFLAGS:00010246
RAX:000000000000a7b5 RBX: dead0000001000f0 RCX:000000000000000d
RDX:000000000000a7b5 RSI: ffffffff81a83ec0 RDI: ffffffffa0293cd4
RBP: ffff88106c141b20 R08:0000000000000000 R09:0000000000000000
R10:0000000000000000 R11:0000000000000000 R12: ffff880581641048
R13:0000000000000001 R14:0000000000000000 R15: ffff88106c0ba080
FS:0000000000000000(0000) GS:ffff880028200000(0000) knlGS:0000000000000000
CS:0010 DS:0018 ES:0018 CR0:000000008005003b
CR2:0000003d3e217280 CR3:0000000869917000 CR4:00000000000006e0
DR0:0000000000000000 DR1:0000000000000000 DR2:0000000000000000
DR3:0000000000000000 DR6:00000000ffff0ff0 DR7:0000000000000400
Process bdi-default (pid:49, threadinfo ffff88106c140000, task ffff88106c0ba080)
Stack:
 ffff8805816411b0 ffff88106c0ba080 ffff8805816411b0 ffff88086bf84a00
<0> ffff8805816411b0 ffff88106c141d40 000000000000001f 000000000000001f
<0> ffff88106c141be0 ffffffffa026db30 ffff880581641212 ffff880581641213
Call Trace:
 [<ffffffffa026db30>] cifs_writepages+0x3b0/0x670 [cifs]
 [<ffffffff81126351>] do_writepages+0x21/0x40
 [<ffffffff811a046d>] writeback_single_inode+0xdd/0x2c0
 [<ffffffff811a08ae>] writeback_sb_inodes+0xce/0x180
 [<ffffffff811a0a0b>] writeback_inodes_wb+0xab/0x1b0
 [<ffffffff811a0dab>] wb_writeback+0x29b/0x3f0
 [<ffffffff814eca40>] ? thread_return+0x4e/0x77e
 [<ffffffff811a1099>] wb_do_writeback+0x199/0x240
 [<ffffffff8107c200>] ? process_timeout+0x0/0x10
 [<ffffffff81134a9a>] bdi_forker_task+0x6a/0x310
 [<ffffffff81134a30>] ? bdi_forker_task+0x0/0x310
 [<ffffffff81090886>] kthread+0x96/0xa0
 [<ffffffff8100c14a>] child_rip+0xa/0x20
 [<ffffffff810907f0>] ? kthread+0x0/0xa0
 [<ffffffff8100c140>] ? child_rip+0x0/0x20
Code:10 48 83 eb 10 49 39 dc 0f 84 83 00 00 00 45 84 ed 74 de 45 84 f6 74 13 48 8b 55 c8 48 8b 82 48 06 00 00 8b 53 20 3b 50 1c 75 d2 <8b> 43 38 83 c0 01 a8 02 74 c8 83 43 7c 01 f6 43 78 01 0f 84 90 
RIP  [<ffffffffa026d69a>] find_writable_file+0xaa/0x190 [cifs] RSP <ffff88106c141ae0>