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WARNING: CPU: 1 PID: 2062 at kernel/signal.c:343 task_participate_group_stop+0x226/0x2d0 kernel/signal.c:343
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 2062 Comm: 5 Not tainted 4.9.155+ #27
 ffff8801cdd2fa28 ffffffff81b47871 0000000000000000 ffffffff82a39be0
 00000000ffffffff 0000000000000001 0000000000000009 ffff8801cdd2fb08
 ffffffff813f746a 0000000041b58ab3 ffffffff82e35b4a ffffffff813f7291
Call Trace:
 [<ffffffff81b47871>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b47871>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<ffffffff813f746a>] panic+0x1d9/0x3bd kernel/panic.c:180
 [<ffffffff813f76ab>] __warn.cold+0x2f/0x2f kernel/panic.c:546
 [<ffffffff810dae7d>] warn_slowpath_null+0x2d/0x40 kernel/panic.c:589
 [<ffffffff81105296>] task_participate_group_stop+0x226/0x2d0 kernel/signal.c:343
 [<ffffffff81109b49>] do_signal_stop+0x3a9/0x810 kernel/signal.c:2028
 [<ffffffff8110dba5>] get_signal+0x5d5/0x14d0 kernel/signal.c:2205
 [<ffffffff810523ec>] do_signal+0x9c/0x1920 arch/x86/kernel/signal.c:807
 [<ffffffff81003dcc>] exit_to_usermode_loop+0x11c/0x160 arch/x86/entry/common.c:158
 [<ffffffff81005907>] prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 [<ffffffff81005907>] syscall_return_slowpath arch/x86/entry/common.c:263 [inline]
 [<ffffffff81005907>] do_syscall_64+0x3f7/0x570 arch/x86/entry/common.c:290
 [<ffffffff82816a93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Kernel Offset: disabled
Rebooting in 86400 seconds..