------------[ cut here ]------------
WARNING: CPU: 1 PID: 2527 at mm/gup.c:385 check_vma_flags mm/gup.c:385 [inline]()
WARNING: CPU: 1 PID: 2527 at mm/gup.c:385 __get_user_pages+0xa04/0xea0 mm/gup.c:499()
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 2527 Comm: syz-executor0 Not tainted 4.4.154+ #33
 0000000000000000 1ee21349527f6219 ffff8800b49af830 ffffffff81a54fed
 ffffffff82835440 ffff8801d1e15f00 ffffffff82892620 0000000000000009
 0000000000000181 ffff8800b49af8f0 ffffffff8138a884 0000000041b58ab3
Call Trace:
 [<ffffffff81a54fed>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81a54fed>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff8138a884>] panic+0x19e/0x359 kernel/panic.c:112
 [<ffffffff8138aa74>] warn_slowpath_common.cold.6+0x20/0x20 kernel/panic.c:455
 [<ffffffff810d17a9>] warn_slowpath_null+0x29/0x30 kernel/panic.c:492
 [<ffffffff8140c184>] check_vma_flags mm/gup.c:385 [inline]
 [<ffffffff8140c184>] __get_user_pages+0xa04/0xea0 mm/gup.c:499
 [<ffffffff8140cd9e>] __get_user_pages_locked mm/gup.c:656 [inline]
 [<ffffffff8140cd9e>] get_user_pages+0x8e/0xa0 mm/gup.c:864
 [<ffffffff8140e5a4>] __access_remote_vm+0x1e4/0x3c0 mm/memory.c:3735
 [<ffffffff81414f88>] access_process_vm+0x58/0x80 mm/memory.c:3813
 [<ffffffff810ef91a>] compat_ptrace_request+0x20a/0x430 kernel/ptrace.c:1171
 [<ffffffff8102bcc3>] ia32_arch_ptrace arch/x86/kernel/ptrace.c:1184 [inline]
 [<ffffffff8102bcc3>] compat_arch_ptrace+0x443/0x620 arch/x86/kernel/ptrace.c:1288
 [<ffffffff810efc54>] C_SYSC_ptrace kernel/ptrace.c:1260 [inline]
 [<ffffffff810efc54>] compat_SyS_ptrace+0x114/0x140 kernel/ptrace.c:1229
 [<ffffffff81005ffe>] do_syscall_32_irqs_on arch/x86/entry/common.c:393 [inline]
 [<ffffffff81005ffe>] do_fast_syscall_32+0x31e/0x8b0 arch/x86/entry/common.c:460
 [<ffffffff82691c90>] sysenter_flags_fixed+0xd/0x1a
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..