BUG: soft lockup - CPU#0 stuck for 67s! when using snapapi26.ko module.

Issue

• System hung when using snapapi26.ko

BUG: soft lockup - CPU#0 stuck for 67s! [pending_biofc00:15659]
Modules linked in: snumbd26(P)(U) des_generic ecb md4 nls_utf8 cifs snapapi26(P)(U) ipv6 microcode virtio_balloon virtio_net i2c_piix4 i2c_core sg ext4 mbcache jbd2 virtio_blk sr_mod cdrom virtio_pci virtio_ring virtio pata_acpi ata_generic ata_piix dm_mirror dm_region_hash dm_log dm_mod [last unloaded: edd]
CPU 0 
Modules linked in: snumbd26(P)(U) des_generic ecb md4 nls_utf8 cifs snapapi26(P)(U) ipv6 microcode virtio_balloon virtio_net i2c_piix4 i2c_core sg ext4 mbcache jbd2 virtio_blk sr_mod cdrom virtio_pci virtio_ring virtio pata_acpi ata_generic ata_piix dm_mirror dm_region_hash dm_log dm_mod [last unloaded: edd]

Pid: 15659, comm: pending_biofc00 Tainted: P           ---------------    2.6.32-279.14.1.el6.x86_64 #1 Red Hat KVM
RIP: 0010:[<ffffffff8150098e>]  [<ffffffff8150098e>] _spin_lock+0x1e/0x30
..
Process pending_biofc00 (pid: 15659, threadinfo ffff880034586000, task ffff880037fea040)
Stack:
..
Call Trace:
 [<ffffffffa01f71d8>] ? sa_cache_save+0x48/0x560 [snapapi26]
 [<ffffffffa01f7f0e>] ? pending_req_handler_thread+0x2ae/0x384 [snapapi26]
 [<ffffffff8100c14a>] ? child_rip+0xa/0x20
 [<ffffffffa01f7c60>] ? pending_req_handler_thread+0x0/0x384 [snapapi26]
 [<ffffffff8100c140>] ? child_rip+0x0/0x20
Code: 00 00 00 01 74 05 e8 62 e0 d7 ff c9 c3 55 48 89 e5 0f 1f 44 00 00 b8 00 00 01 00 3e 0f c1 07 0f b7 d0 c1 e8 10 39 c2 74 0e f3 90 <66> 66 90 66 90 83 3f 00 75 f4 eb df c9 c3 0f 1f 40 00 55 48 89