bisecting fixing commit since 4d552acf337038028f7e2f63a927afb7adf65fc1
building syzkaller on e955ac5009431b0201f2e3cf548472bb8acea696
testing commit 4d552acf337038028f7e2f63a927afb7adf65fc1 with gcc (GCC) 8.1.0
kernel signature: e1408fba87e9a5aef8b972a35e9fdcbfe431cb0f
all runs: crashed: WARNING in perf_group_attach
testing current HEAD fb683b5e3f53a73e761952735736180939a313df
testing commit fb683b5e3f53a73e761952735736180939a313df with gcc (GCC) 8.1.0
kernel signature: f09937f5e16dcdde4f80003511ba042aa8208e24
all runs: crashed: WARNING in perf_group_attach
revisions tested: 2, total time: 23m54.793815356s (build: 16m20.100135919s, test: 6m47.02242326s)
the crash still happens on HEAD
commit msg: Linux 4.19.88
crash: WARNING in perf_group_attach
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
8021q: adding VLAN 0 to HW filter on device batadv0
8021q: adding VLAN 0 to HW filter on device batadv0
8021q: adding VLAN 0 to HW filter on device batadv0
WARNING: CPU: 0 PID: 7337 at kernel/events/core.c:1833 perf_group_attach+0x3b1/0x470 kernel/events/core.c:1825
kobject: 'loop4' (00000000caa9d214): kobject_uevent_env
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 7337 Comm: syz-executor.3 Not tainted 4.19.88-syzkaller #0
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+0x123/0x177 lib/dump_stack.c:118
 panic+0x1cd/0x387 kernel/panic.c:186
 __warn.cold.8+0x1b/0x3c kernel/panic.c:541
 report_bug+0x1a4/0x200 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x200/0x350 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1037
RIP: 0010:perf_group_attach+0x3b1/0x470 kernel/events/core.c:1833
Code: ec 10 4c 39 e3 75 d7 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 9e 80 1d 00 e9 c8 fc ff ff e8 94 80 1d 00 e9 fe fc ff ff <0f> 0b e9 75 fd ff ff e8 a3 80 1d 00 eb c1 e8 9c 80 1d 00 e9 6d fc
RSP: 0018:ffff88808a077aa8 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: ffff88808c89a000 RCX: 1ffff1100ef0ba42
RDX: 1ffff1100ef0ba6b RSI: ffff8880aea312e0 RDI: ffff88807785d358
RBP: ffff88808a077ad8 R08: ffffffff88ea1018 R09: 0000000000000006
R10: fffffbfff11d4201 R11: 0000000000000001 R12: ffff88807785d140
R13: ffffe8ffffc141d0 R14: 0000000000000000 R15: ffff8880aea312c8
 add_event_to_ctx kernel/events/core.c:2391 [inline]
 __perf_install_in_context+0x3f6/0x860 kernel/events/core.c:2532
 remote_function+0x101/0x180 kernel/events/core.c:87
 generic_exec_single+0x1fd/0x3a0 kernel/smp.c:153
 smp_call_function_single+0xe5/0x370 kernel/smp.c:299
 cpu_function_call kernel/events/core.c:141 [inline]
 perf_install_in_context+0x2c1/0x310 kernel/events/core.c:2573
 __do_sys_perf_event_open+0x13d0/0x2080 kernel/events/core.c:10841
 __se_sys_perf_event_open kernel/events/core.c:10466 [inline]
 __x64_sys_perf_event_open+0xb9/0x140 kernel/events/core.c:10466
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4582f9
Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f13e4a1ec78 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000004582f9
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000020000000
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 00007f13e4a1f6d4
R13: 00000000004c492e R14: 00000000004d84a8 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..