Comment 29 for bug 1530405

I'm seeing this issue after desktop upgrade to yakkety with kernel 4.8.0-22-generic but not with kernel 4.4.16-040416-generic.

NMI watchdog: BUG: soft lockup - CPU#2 stuck for 22s! [ps:3908]
Hardware name: Apple Inc. MacBookPro11,1/Mac-189A3D4F975D5FFC, BIOS MBP111.88Z.0138.B07.1402121134 02/12/2014
CPU: 2 PID: 3908 Comm: ps Tainted: P D OE 4.8.0-22-generic #24-Ubuntu
RIP: 0010:[<ffffffffa92cf24b>] [<ffffffffa92cf24b>] native_queued_spin_lock_slowpath+0x17b/0x1a0
Call Trace:
 [<ffffffffa9a9ef10>] _raw_spin_lock+0x20/0x30
 [<ffffffffa94a9236>] pid_revalidate+0x56/0x110
 [<ffffffffa943eb5b>] lookup_fast+0x2eb/0x310
 [<ffffffffa9441e81>] path_openat+0x181/0x1450
 [<ffffffffa94432b4>] ? putname+0x54/0x60
 [<ffffffffa9444491>] do_filp_open+0x91/0x100
 [<ffffffffa9452ea6>] ? __alloc_fd+0x46/0x180
 [<ffffffffa9431505>] do_sys_open+0x135/0x280
 [<ffffffffa943166e>] SyS_open+0x1e/0x20
 [<ffffffffa9a9f076>] entry_SYSCALL_64_fastpath+0x1e/0xa8