bisecting fixing commit since aec3002d07fd2564cd32e56f126fa6db14a168bb building syzkaller on 907bf74686129436f81aa40336ee89f7cc01b0b4 testing commit aec3002d07fd2564cd32e56f126fa6db14a168bb with gcc (GCC) 8.1.0 kernel signature: 53037dd71e50ec8a6761a97272cb2a4e46e3e3fe76caa814c6dfe18d2405850b all runs: crashed: WARNING in perf_group_attach testing current HEAD dda0e2920330128e0dbdeb11c8f25031aa40b11c testing commit dda0e2920330128e0dbdeb11c8f25031aa40b11c with gcc (GCC) 8.1.0 kernel signature: 5c959451781d249c8f2a0889892ce13866cc8fa8d04458e3b8488efd2ca2a0de all runs: crashed: WARNING in perf_group_attach revisions tested: 2, total time: 23m12.100585804s (build: 16m42.860026191s, test: 5m54.814321853s) the crash still happens on HEAD commit msg: Linux 4.19.114 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: 7199 at kernel/events/core.c:1834 perf_group_attach+0x3b1/0x470 kernel/events/core.c:1826 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 7199 Comm: syz-executor.1 Not tainted 4.19.114-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/0x375 kernel/panic.c:186 __warn.cold.8+0x1b/0x3e 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:1834 Code: ec 10 4c 39 e3 75 d7 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 6e 7a 1d 00 e9 c8 fc ff ff e8 64 7a 1d 00 e9 fe fc ff ff <0f> 0b e9 75 fd ff ff e8 73 7a 1d 00 eb c1 e8 6c 7a 1d 00 e9 6d fc RSP: 0018:ffff8880aea07ec0 EFLAGS: 00010002 RAX: dffffc0000000000 RBX: ffff8880982c4b40 RCX: 1ffff11013058872 RDX: 1ffff1101305889b RSI: ffff8880aea313e0 RDI: ffff8880982c44d8 RBP: ffff8880aea07ef0 R08: ffffffff88ea2018 R09: 0000000000000006 R10: fffffbfff11d4401 R11: 0000000000000001 R12: ffff8880982c42c0 R13: ffffe8ffffc141d0 R14: 0000000000000000 R15: ffff8880aea313c8 add_event_to_ctx kernel/events/core.c:2392 [inline] __perf_install_in_context+0x3f6/0x860 kernel/events/core.c:2533 remote_function+0xff/0x180 kernel/events/core.c:87 flush_smp_call_function_queue+0x10e/0x3d0 kernel/smp.c:243 generic_smp_call_function_single_interrupt+0xe/0x11 kernel/smp.c:192 smp_call_function_single_interrupt+0xa0/0x440 arch/x86/kernel/smp.c:304 call_function_single_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:915 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xaf/0xd0 kernel/locking/spinlock.c:184 Code: 48 07 f2 87 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 28 48 83 3d f0 6d 72 01 00 74 15 48 89 df 57 9d <0f> 1f 44 00 00 eb ad e8 00 bf 80 fa eb bb 0f 0b 0f 0b e8 0a d5 11 RSP: 0018:ffff888087eaf7b0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff04 RAX: dffffc0000000000 RBX: 0000000000000282 RCX: 0000000000000000 RDX: 1ffffffff0fe40e9 RSI: 0000000000000001 RDI: 0000000000000282 RBP: ffff888087eaf7c0 R08: fffffbfff138c262 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff89c61308 R13: ffffffff87f99d80 R14: ffff888082fdaf48 R15: ffff888082951a20 debug_object_activate+0x327/0x4e0 lib/debugobjects.c:498 debug_object_activate+0x262/0x4e0 lib/debugobjects.c:513 debug_rcu_head_queue kernel/rcu/rcu.h:193 [inline] __call_rcu.constprop.67+0x35/0x7d0 kernel/rcu/tree.c:2977 call_rcu+0x12/0x20 kernel/rcu/tree_plugin.h:786 _free_event+0x3f3/0xf00 kernel/events/core.c:4473 put_event+0x2b/0x30 kernel/events/core.c:4548 perf_event_release_kernel+0x584/0xc10 kernel/events/core.c:4663 perf_release+0x32/0x50 kernel/events/core.c:4673 __fput+0x249/0x7f0 fs/file_table.c:278 ____fput+0x9/0x10 fs/file_table.c:309 task_work_run+0x108/0x180 kernel/task_work.c:113 get_signal+0x139a/0x1a00 kernel/signal.c:2399 do_signal+0x87/0x1960 arch/x86/kernel/signal.c:821 exit_to_usermode_loop+0x114/0x200 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x413/0x4e0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459519 Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f90cee66c78 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: 0000000000000005 RBX: 0000000000000005 RCX: 0000000000459519 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000020000000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 00007f90cee676d4 R13: 00000000004c618d R14: 00000000004dae20 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds..