bisecting fixing commit since aec3002d07fd2564cd32e56f126fa6db14a168bb building syzkaller on 907bf74686129436f81aa40336ee89f7cc01b0b4 testing commit aec3002d07fd2564cd32e56f126fa6db14a168bb with gcc (GCC) 8.4.1 20210217 kernel signature: 6eb8eeaedb68e9397b47190d3dd8befb619e9b9853f2fe717e8c30ae9c1c2ff6 all runs: crashed: WARNING in perf_group_attach testing current HEAD 78fec1611cbf7b0bdaddfdbf174a3a2463663bff testing commit 78fec1611cbf7b0bdaddfdbf174a3a2463663bff with gcc (GCC) 8.4.1 20210217 kernel signature: 03a4934e7c3a2b854d8d31632f8c53925e6bfb2a965ff5e8d52b4d4724ada75c all runs: crashed: WARNING in perf_group_attach revisions tested: 2, total time: 22m30.152871125s (build: 15m37.788597869s, test: 6m3.839647407s) the crash still happens on HEAD commit msg: Linux 4.19.183 crash: WARNING in perf_group_attach 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 8021q: adding VLAN 0 to HW filter on device batadv0 WARNING: CPU: 0 PID: 6596 at kernel/events/core.c:1840 perf_group_attach+0x3b1/0x470 kernel/events/core.c:1832 Modules linked in: CPU: 0 PID: 6596 Comm: syz-executor.3 Not tainted 4.19.183-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:perf_group_attach+0x3b1/0x470 kernel/events/core.c:1840 Code: ec 10 4c 39 e3 75 d7 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 ce 52 1d 00 e9 c8 fc ff ff e8 c4 52 1d 00 e9 fe fc ff ff <0f> 0b e9 75 fd ff ff e8 d3 52 1d 00 eb c1 e8 cc 52 1d 00 e9 6d fc RSP: 0018:ffff8881e1f5faa8 EFLAGS: 00010006 RAX: dffffc0000000000 RBX: ffff8881e1842500 RCX: 1ffff1103c110ae2 RDX: 1ffff1103c110b0b RSI: ffff8881f6831460 RDI: ffff8881e0885858 RBP: ffff8881e1f5fad8 R08: ffffed103ed0628a R09: ffffed103ed06289 R10: ffffed103ed06289 R11: ffff8881f683144b R12: ffff8881e0885640 R13: ffffe8ffffc11bd0 R14: 0000000000000000 R15: ffff8881f6831448 FS: 00007fddc099d700(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000052c000 CR3: 00000001e18bf004 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: add_event_to_ctx kernel/events/core.c:2398 [inline] __perf_install_in_context+0x3f6/0x880 kernel/events/core.c:2539 remote_function kernel/events/core.c:87 [inline] remote_function+0xff/0x180 kernel/events/core.c:67 generic_exec_single+0x1f5/0x390 kernel/smp.c:153 smp_call_function_single+0xe5/0x370 kernel/smp.c:299 cpu_function_call kernel/events/core.c:147 [inline] perf_install_in_context+0x2c1/0x310 kernel/events/core.c:2580 __do_sys_perf_event_open+0x13fa/0x20d0 kernel/events/core.c:10900 __se_sys_perf_event_open kernel/events/core.c:10525 [inline] __x64_sys_perf_event_open+0xb9/0x140 kernel/events/core.c:10525 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x460c99 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fddc099d1a8 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 0000000000460c99 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000020000000 RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004f43e0 R14: 00000000004b2242 R15: 00007fddc099d6bc irq event stamp: 154 hardirqs last enabled at (153): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (153): [] _raw_spin_unlock_irq+0x27/0x80 kernel/locking/spinlock.c:192 hardirqs last disabled at (154): [] generic_exec_single+0x1ef/0x390 kernel/smp.c:152 softirqs last enabled at (0): [] copy_process.part.34+0x179c/0x76d0 kernel/fork.c:1855 softirqs last disabled at (0): [<0000000000000000>] (null) ---[ end trace 45838241ff023f79 ]--- WARNING: CPU: 0 PID: 6596 at kernel/events/core.c:1943 perf_group_detach+0x65f/0x970 kernel/events/core.c:1900 Modules linked in: CPU: 0 PID: 6596 Comm: syz-executor.3 Tainted: G W 4.19.183-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:perf_group_detach+0x65f/0x970 kernel/events/core.c:1943 Code: b8 be ff ff ff ff 48 8d 78 20 e8 dc 6e d7 ff 85 c0 0f 85 38 fa ff ff 48 c7 c7 20 f9 f0 86 e8 e0 98 fd 04 0f 0b e9 25 fa ff ff <0f> 0b e9 62 fb ff ff 49 8d 7c 24 10 48 b8 00 00 00 00 00 fc ff df RSP: 0018:ffff8881e1f5f960 EFLAGS: 00010083 RAX: ffffed103c3084e3 RBX: ffff8881e0885640 RCX: 1ffff1103c3084a7 RDX: 1ffff1103c3084a6 RSI: ffffe8ffffc11cb0 RDI: ffff8881e0885858 RBP: ffff8881e1f5f9d8 R08: 0000000000000000 R09: 000000000000004b R10: ffffed103c3084db R11: ffff8881e18426df R12: dffffc0000000000 R13: ffff8881e1842500 R14: ffff8881f6831440 R15: ffff8881e1842500 FS: 00007fddc099d700(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000528000 CR3: 00000001e18bf001 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000010602 Call Trace: __perf_remove_from_context+0x1a2/0x400 kernel/events/core.c:2084 event_function+0x2bb/0x3d0 kernel/events/core.c:248 remote_function kernel/events/core.c:87 [inline] remote_function+0xff/0x180 kernel/events/core.c:67 generic_exec_single+0x1f5/0x390 kernel/smp.c:153 smp_call_function_single+0xe5/0x370 kernel/smp.c:299 cpu_function_call kernel/events/core.c:147 [inline] event_function_call+0x35e/0x3c0 kernel/events/core.c:275 perf_remove_from_context+0x85/0x140 kernel/events/core.c:2112 perf_event_release_kernel+0x12c/0xc10 kernel/events/core.c:4583 perf_release+0x32/0x50 kernel/events/core.c:4679 __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 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x1a9/0x200 arch/x86/entry/common.c:167 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: 0033:0x460c99 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fddc099d1a8 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: 0000000000000005 RBX: 000000000052bf00 RCX: 0000000000460c99 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000020000000 RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004f43e0 R14: 00000000004b2242 R15: 00007fddc099d6bc irq event stamp: 910 hardirqs last enabled at (909): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (909): [] _raw_spin_unlock_irq+0x27/0x80 kernel/locking/spinlock.c:192 hardirqs last disabled at (910): [] generic_exec_single+0x1ef/0x390 kernel/smp.c:152 softirqs last enabled at (888): [] __do_softirq+0x62d/0x919 kernel/softirq.c:318 softirqs last disabled at (161): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (161): [] irq_exit+0x17f/0x1c0 kernel/softirq.c:412 ---[ end trace 45838241ff023f7a ]--- WARNING: CPU: 0 PID: 2655 at kernel/events/core.c:1999 INIT_LIST_HEAD include/linux/list.h:29 [inline] WARNING: CPU: 0 PID: 2655 at kernel/events/core.c:1999 list_del_init include/linux/list.h:160 [inline] WARNING: CPU: 0 PID: 2655 at kernel/events/core.c:1999 perf_event_ctx_deactivate kernel/events/core.c:1175 [inline] WARNING: CPU: 0 PID: 2655 at kernel/events/core.c:1999 event_sched_out.isra.99+0x69b/0x970 kernel/events/core.c:2026 Modules linked in: CPU: 0 PID: 2655 Comm: kworker/u4:4 Tainted: G W 4.19.183-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:event_sched_out.isra.99+0x69b/0x970 kernel/events/core.c:1999 Code: 89 9d c0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 5d 02 00 00 49 89 9d c8 00 00 00 e9 39 fd ff ff <0f> 0b e9 ac f9 ff ff 65 48 8b 1c 25 40 ee 01 00 48 8d bb 84 08 00 RSP: 0018:ffff8881f6807dd8 EFLAGS: 00010083 RAX: dffffc0000000000 RBX: ffff8881e0885640 RCX: ffffe8ffffc11bd0 RDX: 1ffff1103c110b0b RSI: ffffe8ffffc11d68 RDI: ffff8881e0885858 RBP: ffff8881f6807e28 R08: ffffe8ffffc11ce0 R09: 0000000000000006 R10: fffffbfff1214c01 R11: 0000000000000001 R12: ffffe8ffffc11bd0 R13: ffffe8ffffc11bd0 R14: ffff8881e0885640 R15: ffff8881e0885660 FS: 0000000000000000(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4470f0b000 CR3: 000000000806d004 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 000000000011060a Call Trace: group_sched_out.part.100+0x5f/0x1f0 kernel/events/core.c:2047 group_sched_out kernel/events/core.c:2042 [inline] ctx_sched_out+0x6a0/0x940 kernel/events/core.c:2963 cpu_ctx_sched_out kernel/events/core.c:3246 [inline] ctx_resched+0xc4/0xe0 kernel/events/core.c:2478 __perf_install_in_context+0x40d/0x880 kernel/events/core.c:2540 remote_function kernel/events/core.c:87 [inline] remote_function+0xff/0x180 kernel/events/core.c:67 flush_smp_call_function_queue+0x10e/0x3d0 kernel/smp.c:243 generic_smp_call_function_single_interrupt+0xe/0x20 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:916 RIP: 0010:preempt_schedule_irq+0xaf/0x140 kernel/sched/core.c:3744 Code: 00 e8 05 23 bc fa e8 c0 2b df fa 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 75 73 48 83 3d f2 ec 8b 01 00 74 61 fb 66 0f 1f 44 00 00 01 00 00 00 e8 17 d5 ff ff 41 80 7d 00 00 75 62 48 83 3d c8 ec RSP: 0018:ffff8881e817fbd0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff04 RAX: 1ffffffff1024023 RBX: 0000000000000000 RCX: 1ffff1103d02e1da RDX: 0000000000000000 RSI: ffff8881e8170ed8 RDI: ffff8881e8170e84 RBP: ffff8881e817fbf8 R08: ffff8881e8170ed0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: fffffbfff1024022 R14: ffffffff88120118 R15: ffffffff88120110 retint_kernel+0x1b/0x2d RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:lock_acquire+0x1f1/0x3d0 kernel/locking/lockdep.c:3910 Code: 00 00 00 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 aa 01 00 00 48 83 3d e3 75 c6 06 00 0f 84 31 01 00 00 48 8b 7d c8 57 9d <0f> 1f 44 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 65 8b RSP: 0018:ffff8881e817fcb0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffff8881e8170600 RCX: 1ffff1103d02e1df RDX: 1ffffffff1024021 RSI: 0000000000000000 RDI: 0000000000000286 RBP: ffff8881e817fcf8 R08: ffff8881e8170ef8 R09: 0000000000000002 R10: ffff8881e8170ed8 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:242 [inline] rcu_read_lock include/linux/rcupdate.h:627 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:419 [inline] batadv_nc_worker+0xec/0x630 net/batman-adv/network-coding.c:730 process_one_work+0x830/0x1670 kernel/workqueue.c:2152 worker_thread+0x85/0xb60 kernel/workqueue.c:2295 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 irq event stamp: 1510234 hardirqs last enabled at (1510233): [] preempt_schedule_irq+0x90/0x140 kernel/sched/core.c:3743 hardirqs last disabled at (1510234): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (1510224): [] spin_unlock_bh include/linux/spinlock.h:374 [inline] softirqs last enabled at (1510224): [] batadv_nc_purge_paths+0x1d6/0x2f0 net/batman-adv/network-coding.c:482 softirqs last disabled at (1510222): [] spin_lock_bh include/linux/spinlock.h:334 [inline] softirqs last disabled at (1510222): [] batadv_nc_purge_paths+0xc0/0x2f0 net/batman-adv/network-coding.c:453 ---[ end trace 45838241ff023f7b ]--- list_add double add: new=ffff8881d73b9760, prev=ffff8881d73b9760, next=ffff8881f6831550. ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:31! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 4.19.183-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_add_valid+0xaa/0xb0 lib/list_debug.c:29 Code: e8 eb a9 48 89 f7 48 89 75 e8 e8 c1 ec 9f fe 48 8b 75 e8 eb bb 48 89 f2 48 89 d9 4c 89 e6 48 c7 c7 20 4e 1f 87 e8 1e a1 80 03 <0f> 0b 0f 1f 40 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 55 RSP: 0000:ffff8881f6807c70 EFLAGS: 00010082 RAX: 0000000000000058 RBX: ffff8881f6831550 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff871f4be0 RDI: ffffffff89c856e0 RBP: ffff8881f6807c88 R08: ffffed103ed05079 R09: ffffed103ed05078 R10: ffffed103ed05078 R11: ffff8881f68283c7 R12: ffff8881d73b9760 R13: ffff8881d73b9760 R14: ffff8881d73b9760 R15: ffff8881f6831558 FS: 0000000000000000(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000528060 CR3: 000000000806d006 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000010602 Call Trace: __list_add include/linux/list.h:60 [inline] list_add_tail include/linux/list.h:93 [inline] flexible_sched_in kernel/events/core.c:3323 [inline] flexible_sched_in+0x5c9/0x8b0 kernel/events/core.c:3311 visit_groups_merge+0x251/0x5a0 kernel/events/core.c:3270 ctx_flexible_sched_in kernel/events/core.c:3356 [inline] ctx_sched_in+0x2bb/0x9c0 kernel/events/core.c:3401 cpu_ctx_sched_in kernel/events/core.c:3410 [inline] perf_event_sched_in+0x77/0x80 kernel/events/core.c:2430 ctx_resched+0x79/0xe0 kernel/events/core.c:2482 __perf_install_in_context+0x40d/0x880 kernel/events/core.c:2540 remote_function kernel/events/core.c:87 [inline] remote_function+0xff/0x180 kernel/events/core.c:67 flush_smp_call_function_queue+0x10e/0x3d0 kernel/smp.c:243 generic_smp_call_function_single_interrupt+0xe/0x20 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:916 RIP: 0010:native_safe_halt+0x12/0x20 arch/x86/include/asm/irqflags.h:61 Code: 11 ff ff ff 4c 89 e7 e8 cc 17 09 fb eb 97 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 e9 07 00 00 00 0f 00 2d f0 39 60 00 fb f4 <5d> c3 66 66 2e 0f 1f 84 00 00 00 00 00 90 55 48 89 e5 e9 07 00 00 RSP: 0000:ffffffff88007c88 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff04 RAX: dffffc0000000000 RBX: ffffffff88079300 RCX: 0000000000000000 RDX: 1ffffffff1024024 RSI: 0000000000000001 RDI: ffffffff88120120 RBP: ffffffff88007c88 R08: ffffed103ed04733 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff88120110 R14: ffffffff88d387e0 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline] default_idle+0x51/0x310 arch/x86/kernel/process.c:557 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:548 default_idle_call+0x6d/0x90 kernel/sched/idle.c:93 cpuidle_idle_call kernel/sched/idle.c:153 [inline] do_idle+0x41e/0x560 kernel/sched/idle.c:263 cpu_startup_entry+0xc8/0xe0 kernel/sched/idle.c:369 rest_init+0x193/0x199 init/main.c:441 start_kernel+0x5f0/0x62c init/main.c:736 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:490 x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:471 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243 Modules linked in: ---[ end trace 45838241ff023f7c ]--- RIP: 0010:__list_add_valid+0xaa/0xb0 lib/list_debug.c:29 Code: e8 eb a9 48 89 f7 48 89 75 e8 e8 c1 ec 9f fe 48 8b 75 e8 eb bb 48 89 f2 48 89 d9 4c 89 e6 48 c7 c7 20 4e 1f 87 e8 1e a1 80 03 <0f> 0b 0f 1f 40 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 55 RSP: 0000:ffff8881f6807c70 EFLAGS: 00010082 RAX: 0000000000000058 RBX: ffff8881f6831550 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff871f4be0 RDI: ffffffff89c856e0 RBP: ffff8881f6807c88 R08: ffffed103ed05079 R09: ffffed103ed05078 R10: ffffed103ed05078 R11: ffff8881f68283c7 R12: ffff8881d73b9760 R13: ffff8881d73b9760 R14: ffff8881d73b9760 R15: ffff8881f6831558 FS: 0000000000000000(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000528060 CR3: 000000000806d006 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000010602