System takes ~10 minutes to boot, modprobe prints backtraces in netxen_init

Issue

• System takes ~10 minutes to boot, modprobe prints backtraces in netxen_init
• Lengthy Server reboot : modprobe blocked for more than 120 seconds
• After upgrading two servers yesterday we noticed that the reboot time of the servers seemed to be much longer than expected. Investigation via the console showed that server reporting messages like this:

kernel: INFO: task modprobe:10408 blocked for more than 120 seconds. 
kernel:      Not tainted 2.6.32-504.16.2.el6.x86_64 #1 
kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 
kernel: ffff885fcc50bb88 0000000000000086 ffff881fd40b4ab0 0000000000000030 
kernel: ffff885fcc50bb18 ffffffff8106d1a5 ffff885fcc50baf8 ffff881fd40b4ae8 
kernel: ffff884070d15928 ffff884070d158c0 ffff885fd1abe5f8 ffff885fcc50bfd8 
kernel: Call Trace: 
kernel: [<ffffffff8106d1a5>] ? enqueue_entity+0x125/0x450 
kernel: [<ffffffff8152ad25>] schedule_timeout+0x215/0x2e0 
kernel: [<ffffffff8106d1a5>] ? enqueue_entity+0x125/0x450 
kernel: [<ffffffff8105ded4>] ? check_preempt_wakeup+0x1a4/0x260 
kernel: [<ffffffff8106d5cb>] ? enqueue_task_fair+0xfb/0x100 
kernel: [<ffffffff8152a9a3>] wait_for_common+0x123/0x180 
kernel: [<ffffffff81064bc0>] ? default_wake_function+0x0/0x20 
kernel: [<ffffffff8152aabd>] wait_for_completion+0x1d/0x20 
kernel: [<ffffffff810982ae>] work_on_cpu+0xae/0xd0 
kernel: [<ffffffff812af3b0>] ? local_pci_probe+0x0/0x20 
kernel: [<ffffffff8152b2be>] ? mutex_lock+0x1e/0x50 
kernel: [<ffffffff812b057b>] pci_device_probe+0xcb/0x120 
kernel: [<ffffffff8136c942>] ? driver_sysfs_add+0x62/0x90 
kernel: [<ffffffff8136cbdc>] driver_probe_device+0x9c/0x3e0 
kernel: [<ffffffff8136cfcb>] __driver_attach+0xab/0xb0 
kernel: [<ffffffff8136cf20>] ? __driver_attach+0x0/0xb0 
kernel: [<ffffffff8136bdc4>] bus_for_each_dev+0x64/0x90 
kernel: [<ffffffff8136c87e>] driver_attach+0x1e/0x20 
kernel: [<ffffffff8136b5f8>] bus_add_driver+0x1e8/0x2b0 
kernel: [<ffffffff8136d226>] driver_register+0x76/0x140 
kernel: [<ffffffff8146dfee>] ? rtnl_unlock+0xe/0x10 
kernel: [<ffffffff812b0816>] __pci_register_driver+0x56/0xd0 
kernel: [<ffffffffa001b000>] ? netxen_init_module+0x0/0x4d [netxen_nic] 
kernel: [<ffffffffa001b000>] ? netxen_init_module+0x0/0x4d [netxen_nic] 
kernel: [<ffffffffa001b04b>] netxen_init_module+0x4b/0x4d [netxen_nic] 
kernel: [<ffffffff8100204c>] do_one_initcall+0x3c/0x1d0 
kernel: [<ffffffff810c00e1>] sys_init_module+0xe1/0x250 
kernel: [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b