------------[ cut here ]------------
WARNING: CPU: 1 PID: 3813 at kernel/signal.c:2086 do_jobctl_trap kernel/signal.c:2086 [inline]()
WARNING: CPU: 1 PID: 3813 at kernel/signal.c:2086 get_signal+0x11de/0x1550 kernel/signal.c:2205()
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 3813 Comm: syz-executor3 Not tainted 4.4.120-gd63fdf6 #28
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 82d69df2a26f54c3 ffff8801d094fb68 ffffffff81d0408d
 ffffffff83843b40 ffff8801d094fc40 ffffffff83849780 0000000000000009
 0000000000000826 ffff8801d094fc30 ffffffff8141ab2a 0000000041b58ab3
Call Trace:
 [<ffffffff81d0408d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d0408d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff8141ab2a>] panic+0x1aa/0x388 kernel/panic.c:112
 [<ffffffff8112d885>] warn_slowpath_common+0x125/0x140 kernel/panic.c:455
 [<ffffffff8112dae9>] warn_slowpath_null+0x29/0x30 kernel/panic.c:492
 [<ffffffff8115d50e>] do_jobctl_trap kernel/signal.c:2086 [inline]
 [<ffffffff8115d50e>] get_signal+0x11de/0x1550 kernel/signal.c:2205
 [<ffffffff8100e7fb>] do_signal+0x8b/0x1d40 arch/x86/kernel/signal.c:712
 [<ffffffff810035fa>] exit_to_usermode_loop+0x11a/0x160 arch/x86/entry/common.c:248
 [<ffffffff81006535>] prepare_exit_to_usermode arch/x86/entry/common.c:283 [inline]
 [<ffffffff81006535>] syscall_return_slowpath+0x1b5/0x1f0 arch/x86/entry/common.c:348
 [<ffffffff83773ae9>] int_ret_from_sys_call+0x25/0xa3