RHEL6 system panics when VxVM is installed and initialized, if EMC PowerPath is already installed.

Issue

• System panics with following panic message when vxconfigd is run, if EMC PowerPath is already installed.

> VxVM vxdmp V-5-0-34 added disk array APM00111001700, datype = PP_EMC_CLARiiON
> 
> VxVM vxdmp V-5-0-34 added disk array DISKS, datype = Disk
> 
> BUG: scheduling while atomic: vxconfigd/20927/0xffff8800
> BUG: unable to handle kernel paging request at 000000012203e5e0
> IP: [<ffffffff81051c0d>] task_rq_lock+0x4d/0xa0
> PGD e3532d067 PUD 0 
> Thread overran stack, or stack corrupted
> Oops: 0000 [#1] SMP 
> last sysfs file: /sys/devices/system/cpu/cpu15/cache/index2/shared_cpu_map
> CPU 0 
> Modules linked in: dmpjbod(P)(U) dmpap(P)(U) dmpaa(P)(U) iptable_filter ip_tables vxportal(P)(U) fdd(P)(U) vxfs(P)(U) exportfs vxspec(P)(U) vxio(P)(U) vxdmp(P)(U) sunrpc bonding ipv6 emcpvlumd(P)(U) emcpxcrypt(P)(U) emcpdm(P)(U) emcpgpx(P)(U) emcpmpx(P)(U) emcp(P)(U) e1000e microcode serio_raw k10temp amd64_edac_mod edac_core edac_mce_amd i2c_piix4 power_meter hpwdt hpilo sg netxen_nic shpchp ext4 mbcache jbd2 sd_mod crc_t10dif sr_mod cdrom lpfc scsi_transport_fc scsi_tgt hpsa pata_acpi ata_generic pata_atiixp ahci radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core dm_mirror dm_region_hash dm_log dm_mod [last unloaded: vxglm]
> 
> Pid: 20927, comm: vxconfigd Tainted: P           ----------------   2.6.32-220.7.1.el6.x86_64 #1 HP ProLiant DL585 G7
> RIP: 0010:[<ffffffff81051c0d>]  [<ffffffff81051c0d>] task_rq_lock+0x4d/0xa0
> RSP: 0018:ffff880028203b30  EFLAGS: 00010086
> RAX: 0000000034088f10 RBX: 0000000000015f80 RCX: 0000000000000000
> RDX: 0000000000000086 RSI: ffff880028203b88 RDI: ffff880e3483a100
> RBP: ffff880028203b50 R08: 0000000000000000 R09: ffff880835c5d090
> R10: 000000000000005e R11: 0000000000000000 R12: ffff880e3483a100
> R13: ffff880028203b88 R14: 0000000000015f80 R15: 0000000000000003
> FS:  00007f5a6b5e1700(0000) GS:ffff880028200000(0063) knlGS:00000000f77b3a10
> CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
> CR2: 000000012203e5e0 CR3: 0000000e34314000 CR4: 00000000000006f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Process vxconfigd (pid: 20927, threadinfo ffff880e344f0000, task ffff880e3483a100)
> Stack:
>  ffff880e3483a100 0000000000000001 0000000000000000 0000000000000000
> <0> ffff880028203bc0 ffffffff8105e44c ffff880037ce5ba8 ffff880000000000
> <0> ffff880435280c80 0000000000000001 ffff880028203bb0 0000000000000086
> Call Trace:
>  <IRQ> 
>  [<ffffffff8105e44c>] try_to_wake_up+0x3c/0x3e0
>  [<ffffffff8105e802>] default_wake_function+0x12/0x20
>  [<ffffffff8104c9e9>] __wake_up_common+0x59/0x90
>  [<ffffffff810518b7>] complete+0x47/0x60
>  [<ffffffff812554e4>] blk_end_sync_rq+0x34/0x40
>  [<ffffffff8125092d>] blk_finish_request+0x8d/0x270
>  [<ffffffffa03ea583>] emcp_finish_pass_thru+0x103/0x140 [emcp]
>  [<ffffffff8125092d>] blk_finish_request+0x8d/0x270
>  [<ffffffff81250f04>] blk_end_bidi_request+0x54/0x80
>  [<ffffffff81250f80>] blk_end_request+0x10/0x20
>  [<ffffffff8136212f>] scsi_io_completion+0xaf/0x640
>  [<ffffffff81359302>] scsi_finish_command+0xc2/0x130
>  [<ffffffff81362825>] scsi_softirq_done+0x145/0x170
>  [<ffffffff81256395>] blk_done_softirq+0x85/0xa0
>  [<ffffffff81072001>] __do_softirq+0xc1/0x1d0
>  [<ffffffff810d94a0>] ? handle_IRQ_event+0x60/0x170
>  [<ffffffff8100c24c>] call_softirq+0x1c/0x30
>  [<ffffffff8100de85>] do_softirq+0x65/0xa0
>  [<ffffffff81071de5>] irq_exit+0x85/0x90
>  [<ffffffff814f4dc5>] do_IRQ+0x75/0xf0
>  [<ffffffff8100ba53>] ret_from_intr+0x0/0x11
>