WARNING in perf_group_attach

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit:    0072a0c14d5b Merge tag 'media/v4.20-4' of git://git.kernel..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10e6d12b400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b9cc5a440391cbfd
dashboard link: https://syzkaller.appspot.com/bug?extid=23fe48cbe532abffa52e
compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=135e93eb400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13189415400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+23fe48cbe532abffa52e@xxxxxxxxxxxxxxxxxxxxxxxxx

WARNING: CPU: 0 PID: 6607 at kernel/events/core.c:1833  
perf_group_attach+0x4c1/0x5a0 kernel/events/core.c:1833
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 6607 Comm: syz-executor062 Not tainted 4.20.0-rc5+ #141
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x244/0x39d lib/dump_stack.c:113
 panic+0x2ad/0x55c kernel/panic.c:188
 __warn.cold.8+0x20/0x45 kernel/panic.c:540
 report_bug+0x254/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969
RIP: 0010:perf_group_attach+0x4c1/0x5a0 kernel/events/core.c:1833
Code: 8d 7c 24 10 48 89 f8 48 c1 e8 03 42 80 3c 30 00 75 51 4d 8b 64 24 10  
49 83 ec 10 4c 39 e3 75 d2 e9 f8 fe ff ff e8 7f ad e9 ff <0f> 0b e9 e0 fc  
ff ff e8 73 06 2d 00 e9 ea fb ff ff e8 69 06 2d 00
RSP: 0018:ffff8881cbf8f5f8 EFLAGS: 00010093
RAX: ffff8881bb87c440 RBX: ffff8881bb6db240 RCX: ffffffff8195eaa6
RDX: 0000000000000000 RSI: ffffffff8195ee41 RDI: ffff8881bb10e398
RBP: ffff8881cbf8f690 R08: ffff8881bb87c440 R09: 0000000000000006
R10: fffffbfff14a7201 R11: 0000000000000001 R12: ffff8881bb10e180
R13: 1ffff110397f1ec1 R14: ffffe8ffffc13098 R15: 0000000000000000
 add_event_to_ctx kernel/events/core.c:2390 [inline]
 __perf_install_in_context+0x5bd/0xb70 kernel/events/core.c:2531
 remote_function+0x12b/0x1a0 kernel/events/core.c:87
 generic_exec_single+0x379/0x5f0 kernel/smp.c:153
 smp_call_function_single+0x25a/0x660 kernel/smp.c:299
 cpu_function_call kernel/events/core.c:141 [inline]
 perf_install_in_context+0x46c/0x510 kernel/events/core.c:2567
 __do_sys_perf_event_open+0x1fa5/0x3020 kernel/events/core.c:10791
 __se_sys_perf_event_open kernel/events/core.c:10420 [inline]
 __x64_sys_perf_event_open+0xbe/0x150 kernel/events/core.c:10420
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x446619
Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7  
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff  
ff 0f 83 7b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fef7efd3db8 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 0000000000446619
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000020000000
RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 00000000006dbc2c
R13: 00007ffca90267df R14: 00007fef7efd49c0 R15: 00000000006dbc20
Kernel Offset: disabled
Rebooting in 86400 seconds..


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