------------[ cut here ]------------
WARNING: CPU: 1 PID: 3860 at kernel/signal.c:2090 do_jobctl_trap kernel/signal.c:2090 [inline]()
WARNING: CPU: 1 PID: 3860 at kernel/signal.c:2090 get_signal+0x11e3/0x14b0 kernel/signal.c:2209()
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 3860 Comm: syz-executor2 Not tainted 4.4.141-g1b37d68 #71
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 8f151d5e9f78d0cf ffff8801be68fb70 ffffffff81e0e18d
 ffffffff83a44200 ffff8801d91bc800 ffffffff83a49e40 0000000000000009
 000000000000082a ffff8801be68fc30 ffffffff8140a1f4 0000000041b58ab3
Call Trace:
 [<ffffffff81e0e18d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81e0e18d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff8140a1f4>] panic+0x19e/0x38d kernel/panic.c:112
 [<ffffffff8140a418>] warn_slowpath_common.cold.6+0x20/0x20 kernel/panic.c:455
 [<ffffffff811301a9>] warn_slowpath_null+0x29/0x30 kernel/panic.c:492
 [<ffffffff8115f303>] do_jobctl_trap kernel/signal.c:2090 [inline]
 [<ffffffff8115f303>] get_signal+0x11e3/0x14b0 kernel/signal.c:2209
 [<ffffffff8100df4b>] do_signal+0x8b/0x1d30 arch/x86/kernel/signal.c:712
 [<ffffffff8100360a>] exit_to_usermode_loop+0x11a/0x160 arch/x86/entry/common.c:249
 [<ffffffff81006535>] prepare_exit_to_usermode arch/x86/entry/common.c:284 [inline]
 [<ffffffff81006535>] syscall_return_slowpath+0x1b5/0x1f0 arch/x86/entry/common.c:349
 [<ffffffff838c2db5>] int_ret_from_sys_call+0x25/0xa3
Shutting down cpus with NMI
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..