WARNING: CPU: 0 PID: 15683 at mm/gup.c:388 check_vma_flags mm/gup.c:388 [inline]()
WARNING: CPU: 0 PID: 15683 at mm/gup.c:388 __get_user_pages+0xae7/0xfd0 mm/gup.c:502()
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 15683 Comm: syz-executor.4 Not tainted 4.4.174+ #4
 0000000000000000 3f08e22d2cd15c25 ffff8800a436f960 ffffffff81aad1a1
 0000000000000000 ffffffff82835ee0 ffffffff82892ea0 0000000000000184
 ffffffff8142cb27 ffff8800a436fa40 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
 [<ffffffff810f2035>] generic_ptrace_pokedata kernel/ptrace.c:1145 [inline]
 [<ffffffff810f2035>] ptrace_request+0x5b5/0xac0 kernel/ptrace.c:861
 [<ffffffff8102b61f>] arch_ptrace+0x3f/0x970 arch/x86/kernel/ptrace.c:923
 [<ffffffff810f18c6>] SYSC_ptrace kernel/ptrace.c:1118 [inline]
 [<ffffffff810f18c6>] SyS_ptrace+0xb6/0x170 kernel/ptrace.c:1083
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
Kernel Offset: disabled
Rebooting in 86400 seconds..