------------[ cut here ]------------
WARNING: CPU: 1 PID: 7007 at mm/gup.c:388 check_vma_flags mm/gup.c:388 [inline]()
WARNING: CPU: 1 PID: 7007 at mm/gup.c:388 __get_user_pages+0xae7/0xfd0 mm/gup.c:502()
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 7007 Comm: syz-executor.2 Not tainted 4.4.174+ #17
 0000000000000000 6a240cebb7b0018c ffff8801be4df8b8 ffffffff81aad1a1
 0000000000000000 ffffffff82835ee0 ffffffff82892ea0 0000000000000184
 ffffffff8142cb27 ffff8801be4df998 ffffffff813a48c2 0000000041b58ab3
Call Trace:
 [<ffffffff81aad1a1>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81aad1a1>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<ffffffff813a48c2>] panic+0x1b9/0x37b kernel/panic.c:112
 [<ffffffff813a4ab9>] warn_slowpath_common kernel/panic.c:455 [inline]
 [<ffffffff813a4ab9>] warn_slowpath_common.cold+0x20/0x20 kernel/panic.c:435
 [<ffffffff810d3aaa>] warn_slowpath_null+0x2a/0x30 kernel/panic.c:492
 [<ffffffff8142cb27>] check_vma_flags mm/gup.c:388 [inline]
 [<ffffffff8142cb27>] __get_user_pages+0xae7/0xfd0 mm/gup.c:502
 [<ffffffff8142d73d>] __get_user_pages_locked mm/gup.c:654 [inline]
 [<ffffffff8142d73d>] get_user_pages+0x6d/0x90 mm/gup.c:864
 [<ffffffff8142eef3>] __access_remote_vm+0x1e3/0x3c0 mm/memory.c:3727
 [<ffffffff81435a96>] access_process_vm+0x66/0x90 mm/memory.c:3809
 [<ffffffff810f2922>] compat_ptrace_request+0x322/0x430 kernel/ptrace.c:1171
 [<ffffffff8102bfcf>] ia32_arch_ptrace arch/x86/kernel/ptrace.c:1184 [inline]
 [<ffffffff8102bfcf>] compat_arch_ptrace+0x7f/0x610 arch/x86/kernel/ptrace.c:1288
 [<ffffffff810f2b39>] C_SYSC_ptrace kernel/ptrace.c:1260 [inline]
 [<ffffffff810f2b39>] compat_SyS_ptrace+0x109/0x180 kernel/ptrace.c:1229
 [<ffffffff8100603d>] do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline]
 [<ffffffff8100603d>] do_fast_syscall_32+0x32d/0xa90 arch/x86/entry/common.c:397
 [<ffffffff8271a350>] sysenter_flags_fixed+0xd/0x1a
Kernel Offset: disabled
Rebooting in 86400 seconds..