After
cat /proc/self/pagemap
BUG: sleeping function called from invalid context at include/asm/uaccess.h:453
in_atomic():1, irqs_disabled():0
1 lock held by cat/14183:
#0: (&mm->mmap_sem){----}, at: [<c017d17b>] pagemap_read+0x11f/0x21b
[<c01b7bc7>] copy_to_user+0x37/0x4c
[<c017cf92>] add_to_pagemap+0x49/0x6f
[<c017d034>] pagemap_pte_range+0x56/0x7e
[<c017cfde>] pagemap_pte_range+0x0/0x7e
[<c01b481d>] walk_page_range+0xf1/0x1a0
[<c017d1e3>] pagemap_read+0x187/0x21b
[<c01fdafa>] tty_write+0x1bb/0x1cc
[<c017d05c>] pagemap_read+0x0/0x21b
[<c01589b0>] vfs_read+0x72/0x95
[<c0158cce>] sys_read+0x41/0x67
[<c0103d96>] sysenter_past_esp+0x8f/0x99
[<c0103d66>] sysenter_past_esp+0x5f/0x99
=======================
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