General protection fault due to invalid value passed in reap_alien()

Issue

• Server crash with RIP in cache_reap() function.
• System crash with following logs in kernel ring buffer :

crash> log
[..]
general protection fault: 0000 [#1] SMP 
last sysfs file: /sys/devices/pci0000:00/0000:00:03.0/0000:07:00.0/host3/rport-3:0-0/target3:0:0/3:0:0:12/state
CPU 9 
Modules linked in: hangcheck_timer mptctl mptbase autofs4 bonding ipv6 dm_round_robin dm_multipath sg ses enclosure power_meter acpi_ipm
i ipmi_si ipmi_msghandler serio_raw iTCO_wdt iTCO_vendor_support hpilo hpwdt tg3 ptp pps_core lpc_ich mfd_core ioatdma dca shpchp ext4 j
bd2 mbcache sd_mod crc_t10dif sr_mod cdrom qla2xxx scsi_transport_fc scsi_tgt hpsa pata_acpi ata_generic ata_piix dm_mirror dm_region_ha
sh dm_log dm_mod [last unloaded: scsi_wait_scan]

Pid: 108, comm: events/9 Not tainted 2.6.32-573.3.1.el6.x86_64 #1 HP ProLiant DL360p Gen8
RIP: 0010:[<ffffffff8117a521>]  [<ffffffff8117a521>] cache_reap+0x121/0x250
RSP: 0018:ffff881029113de0  EFLAGS: 00010282
RAX: ffff88203f802460 RBX: ffff88203f800dc0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: f7ff88203f802480 RDI: ffff88103fde0780
RBP: ffff881029113e30 R08: 0000000000000001 R09: ffff881ef8ad1ec0
R10: 0000000000000000 R11: ffff881ef8ad1b78 R12: ffff88103fdd0740
R13: 0000000000000001 R14: 0000000000012670 R15: 000000000000100d
FS:  0000000000000000(0000) GS:ffff881078860000(0000) knlGS:0000000000000000
CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 00007f6071649113 CR3: 0000000001a8d000 CR4: 00000000000407e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process events/9 (pid: 108, threadinfo ffff881029110000, task ffff88102910d520)
Stack:
 0000000000000000 ffff881078878700 ffff881078872600 ffffffff81149e80
<d> ffff881029113e10 ffff881078878700 ffff881078878700 ffffffff8117a400
<d> ffff881029113fd8 ffff881078878708 ffff881029113ee0 ffffffff8109a7d0
Call Trace:
 [<ffffffff81149e80>] ? vmstat_update+0x0/0x40
 [<ffffffff8117a400>] ? cache_reap+0x0/0x250
 [<ffffffff8109a7d0>] worker_thread+0x170/0x2a0
 [<ffffffff810a14b0>] ? autoremove_wake_function+0x0/0x40
 [<ffffffff8109a660>] ? worker_thread+0x0/0x2a0
 [<ffffffff810a101e>] kthread+0x9e/0xc0
 [<ffffffff8100c28a>] child_rip+0xa/0x20
 [<ffffffff810a0f80>] ? kthread+0x0/0xc0
 [<ffffffff8100c280>] ? child_rip+0x0/0x20
Code: 08 65 48 8b 04 25 50 d1 00 00 4a 8b 14 30 48 8b 43 50 48 85 c0 0f 84 5f ff ff ff 48 63 ca 48 8b 34 c8 48 85 f6 0f 84 4f ff ff ff <8b> 0e 85 c9 0f 84 45 ff ff ff fa 66 0f 1f 44 00 00 48 8d 46 10 
RIP  [<ffffffff8117a521>] cache_reap+0x121/0x250
 RSP <ffff881029113de0>
(END)