System crashes at "block/blk-throttle.c:1222" in Red Hat Enterprise Linux 6.

Issue

• System crashes with the following traces:

  WARNING: at block/blk-throttle.c:1222 blk_throtl_drain+0xff/0x180() (Not tainted)
  Hardware name: PowerEdge R630
  Modules linked in: veeamsnap(U) filepath(U) autofs4 sunrpc 8021q garp stp llc bonding ipv6 microcode power_meter acpi_ipmi ipmi_si ipmi_msghandler iTCO_wdt iTCO_vendor_support dcdbas sb_edac
  edac_core lpc_ich mfd_core shpchp bnx2x ptp pps_core libcrc32c mdio sg ext4 jbd2 mbcache usb_storage sd_mod crc_t10dif ahci megaraid_sas wmi dm_mirror dm_region_hash dm_log dm_mod [last unl
  oaded: speedstep_lib]
  Pid: 7812, comm: Lpb Server thre Not tainted 2.6.32-754.6.3.el6.x86_64 #1
  Call Trace:
  [<ffffffff810805c1>] ? warn_slowpath_common+0x91/0xe0
  [<ffffffff8108062a>] ? warn_slowpath_null+0x1a/0x20
  [<ffffffff812978af>] ? blk_throtl_drain+0xff/0x180
  [<ffffffff81286cd1>] ? __blk_drain_queue+0x91/0x140
  [<ffffffff81286fab>] ? blk_cleanup_queue+0xeb/0x1d0
  [<ffffffffa0436899>] ? _snapimage_destroy+0x1d9/0x3a0 [veeamsnap]
  [<ffffffff815586a3>] ? printk+0x55/0x5a
  [<ffffffffa04390ad>] ? snapimage_destroy+0xad/0x390 [veeamsnap]
  [<ffffffffa04410da>] ? _snapshot_destroy+0x13a/0x3c0 [veeamsnap]
  [<ffffffffa04413e2>] ? snapshot_Destroy+0x82/0x120 [veeamsnap]
  [<ffffffffa0445549>] ? ioctl_snapshot_destroy+0xd9/0x240 [veeamsnap]
  [<ffffffffa0443684>] ? ctrl_unlocked_ioctl+0x54/0x60 [veeamsnap]
  [<ffffffff811b7159>] ? vfs_ioctl+0x29/0xc0
  [<ffffffff811b7314>] ? do_vfs_ioctl+0x84/0x590
  [<ffffffff811a15d4>] ? vfs_write+0x134/0x1a0
  [<ffffffff811b78a1>] ? sys_ioctl+0x81/0xa0
  [<ffffffff81564272>] ? system_call_after_swapgs+0xa2/0x152
  [<ffffffff8156427e>] ? system_call_after_swapgs+0xae/0x152
  [<ffffffff81564272>] ? system_call_after_swapgs+0xa2/0x152
  [<ffffffff81564357>] ? system_call_fastpath+0x35/0x3a
  [<ffffffff8156427e>] ? system_call_after_swapgs+0xae/0x152
  

• Another call trace:

 ------------[ cut here ]------------
 WARNING: at block/blk-throttle.c:1222 blk_throtl_drain+0xff/0x180() (Tainted: P           -- ------------   )
 Hardware name: ProLiant BL460c Gen8
 Modules linked in: iptable_filter ip_tables oracleacfs(P)(U) oracleadvm(P)(U) oracleoks(P)(U) mptctl mptbase ext2 nfs lockd fscache auth_rpcgss nfs_acl sunrpc bonding ipv6 emcpvlumd(P)(U) emcpxcrypt(P)(U) emcpdm(P)(U) emcpgpx(P)(U) emcpmpx(P)(U) emcp(P)(U) hangcheck_timer iTCO_wdt iTCO_vendor_support microcode serio_raw hpilo hpwdt lpc_ich mfd_core ioatdma dca sg power_meter acpi_ipmi ipmi_si ipmi_msghandler shpchp ext4 jbd2 mbcache sd_mod crc_t10dif qla2xxx scsi_transport_fc scsi_tgt hpsa be2net video output dm_mirror dm_region_hash dm_log dm_mod [last unloaded: emcpioc]
 Pid: 1236, comm: fc_wq_2 Tainted: P           -- ------------    2.6.32-754.6.3.el6.x86_64 #1
 Call Trace:
 [<ffffffff810805c1>] ? warn_slowpath_common+0x91/0xe0
 [<ffffffff8108062a>] ? warn_slowpath_null+0x1a/0x20
 [<ffffffff812978af>] ? blk_throtl_drain+0xff/0x180
 [<ffffffff81286cd1>] ? __blk_drain_queue+0x91/0x140
 [<ffffffff81286fab>] ? blk_cleanup_queue+0xeb/0x1d0
 [<ffffffffa029aa1c>] ? emcp_lnx_reset_native_queue+0x4c/0xd0 [emcp]
 [<ffffffffa02b2be8>] ? emcp_remove+0x258/0x550 [emcp]
 [<ffffffffa02b2f55>] ? emcp_chg_device_notify+0x75/0x90 [emcp]
 [<ffffffff81560350>] ? notifier_call_chain+0x50/0x80
 [<ffffffff810b158a>] ? __blocking_notifier_call_chain+0x5a/0x80
 [<ffffffff810b15c6>] ? blocking_notifier_call_chain+0x16/0x20
 [<ffffffff8138f088>] ? __device_release_driver+0x58/0xe0
 [<ffffffff8138f20d>] ? device_release_driver+0x2d/0x40
 [<ffffffff8138e113>] ? bus_remove_device+0xa3/0x110
 [<ffffffff8138baf0>] ? device_del+0x130/0x210
 [<ffffffff813b4e73>] ? __scsi_remove_device+0xd3/0xe0
 [<ffffffff813b4eb0>] ? scsi_remove_device+0x30/0x50
 [<ffffffff813b507b>] ? scsi_remove_target+0x18b/0x1d0
 [<ffffffffa009a610>] ? fc_starget_delete+0x0/0x30 [scsi_transport_fc]
 [<ffffffffa009a636>] ? fc_starget_delete+0x26/0x30 [scsi_transport_fc]
 [<ffffffff810a4062>] ? worker_thread+0x172/0x2a0
 [<ffffffff810aaed0>] ? autoremove_wake_function+0x0/0x40
 [<ffffffff810a3ef0>] ? worker_thread+0x0/0x2a0
 [<ffffffff810aaa30>] ? kthread+0xa0/0xc0
 [<ffffffff815657d0>] ? child_rip+0x20/0x30
 [<ffffffff810aa990>] ? kthread+0x0/0xc0
 [<ffffffff815657b0>] ? child_rip+0x0/0x30
 ---[ end trace 528523aee578957c ]---