------------[ cut here ]------------
WARNING: CPU: 0 PID: 26957 at kernel/events/core.c:1655 perf_group_attach kernel/events/core.c:1655 [inline]
WARNING: CPU: 0 PID: 26957 at kernel/events/core.c:1655 add_event_to_ctx+0x8f3/0xc30 kernel/events/core.c:2229
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 26957 Comm: syz-executor.5 Not tainted 4.9.193+ #0
 ffff8801a2447958 ffffffff81b67081 0000000000000000 ffffffff82a3b340
 00000000ffffffff 0000000000000000 0000000000000009 ffff8801a2447a38
 ffffffff813fefda 0000000041b58ab3 ffffffff82e32ec5 ffffffff813fee01
Call Trace:
 [<000000005c9a0a25>] __dump_stack lib/dump_stack.c:15 [inline]
 [<000000005c9a0a25>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<0000000010d1a709>] panic+0x1d9/0x3bd kernel/panic.c:180
 [<00000000345d63f7>] __warn.cold+0x2f/0x2f kernel/panic.c:546
 [<00000000ce1f9a20>] warn_slowpath_null+0x2d/0x40 kernel/panic.c:589
 [<0000000052fd885c>] perf_group_attach kernel/events/core.c:1655 [inline]
 [<0000000052fd885c>] add_event_to_ctx+0x8f3/0xc30 kernel/events/core.c:2229
 [<000000004fa9c2c3>] __perf_install_in_context+0x282/0x330 kernel/events/core.c:2320
 [<00000000b76bcc79>] remote_function kernel/events/core.c:83 [inline]
 [<00000000b76bcc79>] remote_function+0x11e/0x1a0 kernel/events/core.c:63
 [<000000004d0fe008>] generic_exec_single+0x1c4/0x320 kernel/smp.c:141
 [<00000000fa4eaac2>] smp_call_function_single+0x10d/0x380 kernel/smp.c:285
 [<00000000094ad0a3>] cpu_function_call kernel/events/core.c:137 [inline]
 [<00000000094ad0a3>] perf_install_in_context+0x2f9/0x3a0 kernel/events/core.c:2356
 [<0000000070203a1f>] SYSC_perf_event_open kernel/events/core.c:10033 [inline]
 [<0000000070203a1f>] SyS_perf_event_open+0x1bd3/0x2720 kernel/events/core.c:9674
 [<0000000007960f5a>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
 [<00000000468d3761>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Kernel Offset: disabled
Rebooting in 86400 seconds..