Issue

• After losing the storage connectivity, cluster node panicked with the following message:

kernel BUG at fs/gfs2/trans.c:33!
invalid opcode: 0000 [#1] SMP 
last sysfs file: /sys/kernel/dlm/vg0005-lv01/event_done
CPU 24 
Modules linked in: sctp libcrc32c ptlpfc(U) ptmem(U) lpfc(U) gfs2 dlm configfs ipmi_devintf ipmi_si ipmi_msghandler bonding 8021q garp stp llc ipv6 dm_round_robin qla2xxx scsi_transport_fc scsi_tgt microcode serio_raw sg cdc_ether usbnet mii i2c_i801 i2c_core iTCO_wdt iTCO_vendor_support shpchp ioatdma i7core_edac edac_core igb dca bnx2 ext3 jbd mbcache sr_mod cdrom usb_storage sd_mod crc_t10dif pata_acpi ata_generic ata_piix megaraid_sas dm_multipath dm_mirror dm_region_hash dm_log dm_mod [last unloaded: lpfc]

Pid: 52805, comm: vtl Tainted: G        W  ---------------    2.6.32-279.el6.x86_64 #1 IBM System x3850 X5 -[7143B6G]-/Node 1, Processor Card
RIP: 0010:[<ffffffffa03fdde0>]  [<ffffffffa03fdde0>] gfs2_trans_begin+0x180/0x1d0 [gfs2]
..
Process vtl (pid: 52805, threadinfo ffff880e2f9da000, task ffff8801bd792aa0)
Stack:
..
Call Trace:
 [<ffffffffa03ea568>] gfs2_write_begin+0x198/0x500 [gfs2]
 [<ffffffff81114ab3>] generic_file_buffered_write+0x123/0x2e0
 [<ffffffff81116450>] __generic_file_aio_write+0x250/0x480
 [<ffffffff81428003>] ? sock_sendmsg+0x123/0x150
 [<ffffffff811166ef>] generic_file_aio_write+0x6f/0xe0
 [<ffffffffa03ec8be>] gfs2_file_aio_write+0x7e/0xb0 [gfs2]
 [<ffffffff810a43fe>] ? futex_wake+0x10e/0x120
 [<ffffffff8117ad6a>] do_sync_write+0xfa/0x140
 [<ffffffff810920d0>] ? autoremove_wake_function+0x0/0x40
 [<ffffffff81213136>] ? security_file_permission+0x16/0x20
 [<ffffffff8117b068>] vfs_write+0xb8/0x1a0
 [<ffffffff810d69e2>] ? audit_syscall_entry+0x272/0x2a0
 [<ffffffff8117bb42>] sys_pwrite64+0x82/0xa0
 [<ffffffff8100b0f2>] system_call_fastpath+0x16/0x1b