BUG: Bad page map in process HTMLParserThrea  pte:6c004700690070 pmd:0008f067
addr:00002a1c6c03c000 vm_flags:08100073 anon_vma:ffff880006c29090 mapping:          (null) index:2a1c6c03c
CPU: 1 PID: 4861 Comm: HTMLParserThrea Tainted: P    B      OE 3.16.0-21-generic #28-Ubuntu
Hardware name: Apple Inc. MacBookPro7,1/Mac-F222BEC8, BIOS    MBP71.88Z.0039.B05.1003251322 03/25/10
 ffff88000c664300 ffff88011819bac0 ffffffff8177f67c 00002a1c6c03c000
 ffff88011819bb08 ffffffff81194451 0063004100000dc4 0000000000000000
 ffff88000008f1e0 006c004700690070 00002a1c6c200000 ffff88011819bc78
Call Trace:
 [<ffffffff8177f67c>] dump_stack+0x45/0x56
 [<ffffffff81194451>] print_bad_pte+0x1c1/0x290
 [<ffffffff811959b0>] unmap_page_range+0x640/0x7f0
 [<ffffffff81195bdd>] unmap_single_vma+0x7d/0xf0
 [<ffffffff811968c4>] unmap_vmas+0x54/0xb0
 [<ffffffff8119fbfc>] exit_mmap+0x9c/0x180
 [<ffffffff8106cd6c>] mmput+0x5c/0x120
 [<ffffffff810724ed>] do_exit+0x32d/0xab0
 [<ffffffff81072cf3>] do_group_exit+0x43/0xc0
 [<ffffffff8108309f>] get_signal_to_deliver+0x29f/0x8d0
 [<ffffffff810125a8>] do_signal+0x48/0xb00
 [<ffffffff8112239a>] ? __secure_computing+0xaa/0x2c0
 [<ffffffff810116a6>] ? __switch_to+0x1d6/0x5e0
 [<ffffffff810130c9>] do_notify_resume+0x69/0xb0
 [<ffffffff8178796a>] int_signal+0x12/0x17