Kernel-2.6.32-220.el6 panicked at "find_writable_file" function of CIFS module.

Issue

• Server crashed with following crash logs.

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
.
.
.
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>