bisecting fixing commit since aec3002d07fd2564cd32e56f126fa6db14a168bb building syzkaller on 907bf74686129436f81aa40336ee89f7cc01b0b4 testing commit aec3002d07fd2564cd32e56f126fa6db14a168bb compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 6eb8eeaedb68e9397b47190d3dd8befb619e9b9853f2fe717e8c30ae9c1c2ff6 all runs: crashed: WARNING in perf_group_attach testing current HEAD b172b44fcb1771e083aad806fa96f3f60e2ddfac testing commit b172b44fcb1771e083aad806fa96f3f60e2ddfac compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 61f3738f2d916d84da2f1ce3fe5134952c44e6822c2c12e8e137c88dbf034cb1 all runs: crashed: WARNING in perf_group_attach revisions tested: 2, total time: 30m46.576967593s (build: 23m2.910855992s, test: 6m33.333856003s) the crash still happens on HEAD commit msg: Linux 4.19.206 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: 6872 at kernel/events/core.c:1840 perf_group_attach+0x3b1/0x470 kernel/events/core.c:1832 Modules linked in: CPU: 0 PID: 6872 Comm: syz-executor.2 Not tainted 4.19.206-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 0e 59 1d 00 e9 c8 fc ff ff e8 04 59 1d 00 e9 fe fc ff ff <0f> 0b e9 75 fd ff ff e8 13 59 1d 00 eb c1 e8 0c 59 1d 00 e9 6d fc RSP: 0018:ffff8881e00cfaa8 EFLAGS: 00010002 RAX: dffffc0000000000 RBX: ffff8881dcc4c040 RCX: 1ffff1103b598d2a RDX: 1ffff1103b598d53 RSI: ffff8881f68314e0 RDI: ffff8881dacc6a98 RBP: ffff8881e00cfad8 R08: ffffffff890a7018 R09: 0000000000000006 R10: fffffbfff1214e01 R11: 0000000000000001 R12: ffff8881dacc6880 R13: ffffe8ffffc11ca0 R14: 0000000000000000 R15: ffff8881f68314c8 FS: 00007f4e2fc3f700(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000052c071 CR3: 00000001dc5b0006 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 000000000111062a Call Trace: add_event_to_ctx kernel/events/core.c:2399 [inline] __perf_install_in_context+0x3f6/0x880 kernel/events/core.c:2540 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:2581 __do_sys_perf_event_open+0x13fa/0x20d0 kernel/events/core.c:10924 __se_sys_perf_event_open kernel/events/core.c:10549 [inline] __x64_sys_perf_event_open+0xb9/0x140 kernel/events/core.c:10549 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:00007f4e2fc3f1a8 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: 00007f4e2fc3f6bc irq event stamp: 140 hardirqs last enabled at (139): [] __free_pages_ok+0x630/0xd80 mm/page_alloc.c:1286 hardirqs last disabled at (140): [] 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 8423c3db1ebb6781 ]--- WARNING: CPU: 0 PID: 0 at kernel/events/core.c:1999 INIT_LIST_HEAD include/linux/list.h:29 [inline] WARNING: CPU: 0 PID: 0 at kernel/events/core.c:1999 list_del_init include/linux/list.h:160 [inline] WARNING: CPU: 0 PID: 0 at kernel/events/core.c:1999 perf_event_ctx_deactivate kernel/events/core.c:1175 [inline] WARNING: CPU: 0 PID: 0 at kernel/events/core.c:1999 event_sched_out.isra.99+0x69b/0x970 kernel/events/core.c:2026 Modules linked in: CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 4.19.206-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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 80 ee 01 00 48 8d bb 84 08 00 RSP: 0018:ffff8881f6807ab8 EFLAGS: 00010083 RAX: dffffc0000000000 RBX: ffff8881dcc4c040 RCX: ffffe8ffffc11ca0 RDX: 1ffff1103b598d53 RSI: ffffe8ffffc11e38 RDI: ffff8881dacc6a98 RBP: ffff8881f6807b08 R08: ffffed103b989844 R09: ffffed103b989843 R10: ffffed103b989843 R11: ffff8881dcc4c21f R12: ffffe8ffffc11ca0 R13: ffffe8ffffc11ca0 R14: ffff8881dacc6880 R15: ffff8881dacc6880 FS: 0000000000000000(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7f032e8000 CR3: 000000000806d003 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000001010622 Call Trace: group_sched_out.part.100+0x17b/0x1f0 kernel/events/core.c:2053 group_sched_out kernel/events/core.c:2042 [inline] ctx_sched_out+0x6a0/0x980 kernel/events/core.c:2964 cpu_ctx_sched_out kernel/events/core.c:3254 [inline] ctx_resched+0xc4/0xe0 kernel/events/core.c:2479 __perf_install_in_context+0x40d/0x880 kernel/events/core.c:2541 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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:kmem_cache_free+0xb0/0x290 mm/slab.c:3766 Code: 84 e6 00 00 00 41 f7 c5 00 02 00 00 0f 84 b7 00 00 00 e8 a3 29 d5 ff 48 83 3d 13 d3 81 06 00 0f 84 cd 01 00 00 4c 89 ef 57 9d <0f> 1f 44 00 00 4c 8b 6d 08 0f 1f 44 00 00 65 8b 05 9b 52 71 7e 83 RSP: 0018:ffff8881f6807d98 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff04 RAX: 0000000000000007 RBX: ffff8881e5c96e40 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff88079b88 RDI: 0000000000000282 RBP: ffff8881f6807db8 R08: 0000000000000038 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881e99d9c80 R13: 0000000000000282 R14: ffffffff85082913 R15: ffff8881e99d9c88 dst_destroy+0x1f3/0x330 net/core/dst.c:141 dst_destroy_rcu+0xd/0x10 net/core/dst.c:154 __rcu_reclaim kernel/rcu/rcu.h:236 [inline] rcu_do_batch kernel/rcu/tree.c:2584 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2864 [inline] rcu_process_callbacks+0xbcd/0x19a0 kernel/rcu/tree.c:2881 __do_softirq+0x25f/0x919 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x17f/0x1c0 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x13e/0x540 arch/x86/kernel/apic/apic.c:1098 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:native_safe_halt+0x12/0x20 arch/x86/include/asm/irqflags.h:61 Code: 11 ff ff ff 4c 89 e7 e8 bc 8e 07 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 7b 5e 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: 0018:ffffffff88007c88 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffffffff88079300 RCX: 0000000000000000 RDX: 1ffffffff1024034 RSI: 0000000000000001 RDI: ffffffff881201a0 RBP: ffffffff88007c88 R08: ffffed103ed0473b R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff88120190 R14: ffffffff88d38e20 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 irq event stamp: 222417 hardirqs last enabled at (222416): [] kmem_cache_free+0x9d/0x290 mm/slab.c:3766 hardirqs last disabled at (222417): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (222366): [] _local_bh_enable+0x1c/0x30 kernel/softirq.c:162 softirqs last disabled at (222367): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (222367): [] irq_exit+0x17f/0x1c0 kernel/softirq.c:412 ---[ end trace 8423c3db1ebb6782 ]--- WARNING: CPU: 0 PID: 5312 at kernel/events/core.c:1943 perf_group_detach+0x65f/0x970 kernel/events/core.c:1900 Modules linked in: CPU: 0 PID: 5312 Comm: in:imklog Tainted: G W 4.19.206-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 4c 4e d7 ff 85 c0 0f 85 38 fa ff ff 48 c7 c7 a0 fc f0 86 e8 20 1f ff 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:ffff8881f6807e18 EFLAGS: 00010083 RAX: ffffed103b98984b RBX: ffff8881dacc6880 RCX: ffffe8ffffc11ca0 RDX: ffffe8ffffc11db0 RSI: ffff8881d9a68ea0 RDI: ffff8881dacc6a98 RBP: ffff8881f6807e90 R08: 0000000000000000 R09: ffff8881d9a68ea0 R10: ffff8881dacc68a0 R11: ffffe8ffffc11db8 R12: dffffc0000000000 R13: ffff8881dcc4c040 R14: ffff8881f68314c0 R15: ffff8881dcc4c040 FS: 00007f9e7bbca700(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7f032e8000 CR3: 00000001e7e79004 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 00000000111106aa Call Trace: __perf_remove_from_context+0x1d4/0x440 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 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: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: 88 01 12 88 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 00 15 89 01 00 74 15 48 89 df 57 9d <0f> 1f 44 00 00 eb ad e8 4f 64 77 fa eb bb 0f 0b 0f 0b e8 ea 79 07 RSP: 0018:ffff8881e3547a38 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff04 RAX: dffffc0000000000 RBX: 0000000000000282 RCX: 0000000000000000 RDX: 1ffffffff1024031 RSI: 0000000000000001 RDI: 0000000000000282 RBP: ffff8881e3547a48 R08: ffffed103cd77dd2 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881e6bbee88 R13: ffff8881e6bbe6c0 R14: ffff8881f692c400 R15: 0000000000000001 try_to_wake_up+0xc2/0xf20 kernel/sched/core.c:2056 wake_up_process kernel/sched/core.c:2124 [inline] wake_up_q+0xa4/0x100 kernel/sched/core.c:442 futex_wake_op kernel/futex.c:1848 [inline] do_futex+0x4d0/0x1530 kernel/futex.c:3900 __do_sys_futex kernel/futex.c:3950 [inline] __se_sys_futex kernel/futex.c:3918 [inline] __x64_sys_futex+0x1cb/0x3a0 kernel/futex.c:3918 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f9e7e20a845 Code: 00 00 00 74 17 49 8b 48 20 44 8b 59 10 41 83 e3 30 41 83 fb 20 74 1e be 85 00 00 00 41 ba 01 00 00 00 41 b9 01 00 00 04 0f 05 <48> 3d 01 f0 ff ff 73 1f 31 c0 c3 be 8c 00 00 00 49 89 c8 4d 31 d2 RSP: 002b:00007f9e7bba93a8 EFLAGS: 00000283 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9e7e20a845 RDX: 0000000000000001 RSI: 0000000000000085 RDI: 0000560c6a85528c RBP: 0000000000000001 R08: 0000560c6a855288 R09: 0000000004000001 R10: 0000000000000001 R11: 0000000000000283 R12: 0000000000000000 R13: 0000000000000001 R14: 0000560c69a8c770 R15: 0000560c6a8550e0 irq event stamp: 15220 hardirqs last enabled at (15219): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (15219): [] _raw_spin_unlock_irqrestore+0x82/0xd0 kernel/locking/spinlock.c:184 hardirqs last disabled at (15220): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (3418): [] __do_softirq+0x62d/0x919 kernel/softirq.c:318 softirqs last disabled at (3175): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (3175): [] irq_exit+0x17f/0x1c0 kernel/softirq.c:412 ---[ end trace 8423c3db1ebb6783 ]--- WARNING: CPU: 0 PID: 6861 at kernel/events/core.c:1598 perf_event_groups_delete+0xa4/0xe0 kernel/events/core.c:1602 Modules linked in: CPU: 0 PID: 6861 Comm: syz-executor.1 Tainted: G W 4.19.206-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:perf_event_groups_delete+0xa4/0xe0 kernel/events/core.c:1597 Code: 5c 24 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 21 49 c7 44 24 48 00 00 00 00 5b 41 5c 41 5d 5d c3 <0f> 0b eb a9 48 89 df e8 90 72 1d 00 e9 75 ff ff ff e8 26 73 1d 00 RSP: 0018:ffff8881f6807e30 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff8881dacc68b0 RCX: 0000000000000000 RDX: 1ffff1103ed062b4 RSI: ffff8881dacc6880 RDI: ffff8881f68315a0 RBP: ffff8881f6807e48 R08: ffff8881dacc6890 R09: 1ffffd1ffff823b6 R10: 1ffff1103b13b545 R11: 0000000000000001 R12: ffff8881dacc6880 R13: ffff8881f68315a0 R14: ffff8881f68315b0 R15: ffff8881f68315b0 FS: 00000000013d1400(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000528000 CR3: 00000001e6b8e005 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: del_event_from_groups kernel/events/core.c:1613 [inline] list_del_event+0x565/0x6d0 kernel/events/core.c:1880 __perf_remove_from_context+0x8d/0x440 kernel/events/core.c:2085 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 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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:lock_release+0x44e/0x850 kernel/locking/lockdep.c:3930 Code: 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 f8 02 00 00 48 83 3d 29 6e c6 06 00 0f 84 49 02 00 00 48 8b bd 68 ff ff ff 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 c7 04 03 00 00 00 RSP: 0018:ffff8881ce067c48 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff04 RAX: dffffc0000000000 RBX: 1ffff11039c0cf8d RCX: 1ffff1103b83959d RDX: 1ffffffff1024031 RSI: 0000000000000000 RDI: 0000000000000282 RBP: ffff8881ce067cf0 R08: ffff8881dc1cace8 R09: 0000000000000000 R10: ffff8881dc1cacc8 R11: 0000000000000001 R12: ffff8881dc1ca440 R13: 0000000000000001 R14: 0000000000000000 R15: ffff8881dc1ca440 __raw_spin_unlock include/linux/spinlock_api_smp.h:150 [inline] _raw_spin_unlock+0x1a/0x50 kernel/locking/spinlock.c:176 spin_unlock include/linux/spinlock.h:369 [inline] dentry_unlink_inode+0x191/0x2f0 fs/dcache.c:367 __dentry_kill+0x2d1/0x550 fs/dcache.c:566 dentry_kill+0x94/0x400 fs/dcache.c:685 dput.part.27+0x3a1/0x460 fs/dcache.c:846 dput+0x9/0x10 fs/dcache.c:828 __fput+0x345/0x7f0 fs/file_table.c:291 ____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: 0033:0x41429b Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007ffd21921b70 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 000000000041429b RDX: 0000000000000000 RSI: 00000000005319c8 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000a959 R10: 00007ffd21921c30 R11: 0000000000000293 R12: 00000000000003e8 R13: 000000000052bfa8 R14: 000000000052bf00 R15: ffffffffffffffff irq event stamp: 2254 hardirqs last enabled at (2253): [] __call_rcu.constprop.67+0x2dc/0x7d0 kernel/rcu/tree.c:3031 hardirqs last disabled at (2254): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (0): [] copy_process.part.34+0x179c/0x76d0 kernel/fork.c:1855 softirqs last disabled at (0): [<0000000000000000>] (null) ---[ end trace 8423c3db1ebb6784 ]--- list_add double add: new=ffff8881d86ce9e0, prev=ffff8881d86ce9e0, next=ffff8881f68315d0. ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:31! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 6861 Comm: syz-executor.1 Tainted: G W 4.19.206-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 e1 f9 9e fe 48 8b 75 e8 eb bb 48 89 f2 48 89 d9 4c 89 e6 48 c7 c7 80 67 1f 87 e8 3e 2e 81 03 <0f> 0b 0f 1f 40 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 55 RSP: 0018:ffff8881f6807c70 EFLAGS: 00010082 RAX: 0000000000000058 RBX: ffff8881f68315d0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff871f6540 RDI: ffffffff89c866e0 RBP: ffff8881f6807c88 R08: ffffed103ed05089 R09: ffffed103ed05088 R10: ffffed103ed05088 R11: ffff8881f6828447 R12: ffff8881d86ce9e0 R13: ffff8881d86ce9e0 R14: ffff8881d86ce9e0 R15: ffff8881f68315d8 FS: 00000000013d1400(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005610ea71ccc8 CR3: 00000001e6b8e002 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:3336 [inline] flexible_sched_in+0x61e/0x920 kernel/events/core.c:3319 visit_groups_merge+0x251/0x5a0 kernel/events/core.c:3278 ctx_flexible_sched_in kernel/events/core.c:3367 [inline] ctx_sched_in+0x2bb/0x9c0 kernel/events/core.c:3412 cpu_ctx_sched_in kernel/events/core.c:3421 [inline] perf_event_sched_in+0x77/0x80 kernel/events/core.c:2431 ctx_resched+0x79/0xe0 kernel/events/core.c:2483 __perf_install_in_context+0x40d/0x880 kernel/events/core.c:2541 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:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x56/0x80 kernel/locking/spinlock.c:192 Code: 12 88 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 32 48 83 3d eb 17 89 01 00 74 1f fb 66 0f 1f 44 00 00 01 00 00 00 e8 40 32 b9 fa 65 8b 05 49 04 79 79 85 c0 74 05 5b RSP: 0018:ffff8881ce067950 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff04 RAX: dffffc0000000000 RBX: ffff8881f682c400 RCX: 1ffff1103b83959d RDX: 1ffffffff1024033 RSI: ffff8881dc1cacc8 RDI: ffffffff88120198 RBP: ffff8881ce067958 R08: ffff8881dc1cace8 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881f682c400 R13: ffff8881d9d0e2c0 R14: ffff8881d9b6f4c0 R15: ffff8881f682c400 finish_lock_switch kernel/sched/core.c:2578 [inline] finish_task_switch+0x14a/0x6f0 kernel/sched/core.c:2678 context_switch kernel/sched/core.c:2831 [inline] __schedule+0xdbd/0x1d40 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1015 [inline] __mutex_lock+0x7fd/0x11a0 kernel/locking/mutex.c:1083 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1098 perf_event_ctx_lock_nested+0x1b8/0x330 kernel/events/core.c:1283 perf_event_ctx_lock kernel/events/core.c:1296 [inline] perf_event_release_kernel+0xe6/0xc10 kernel/events/core.c:4605 perf_release+0x32/0x50 kernel/events/core.c:4703 __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: 0033:0x41429b Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007ffd21921b70 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000006 RCX: 000000000041429b RDX: 0000000000000000 RSI: 00000000005319c8 RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000a959 R10: 00007ffd21921c30 R11: 0000000000000293 R12: 00000000000003e8 R13: 000000000052bfa8 R14: 000000000052bf00 R15: ffffffffffffffff Modules linked in: ---[ end trace 8423c3db1ebb6785 ]--- RIP: 0010:__list_add_valid+0xaa/0xb0 lib/list_debug.c:29 Code: e8 eb a9 48 89 f7 48 89 75 e8 e8 e1 f9 9e fe 48 8b 75 e8 eb bb 48 89 f2 48 89 d9 4c 89 e6 48 c7 c7 80 67 1f 87 e8 3e 2e 81 03 <0f> 0b 0f 1f 40 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 55 RSP: 0018:ffff8881f6807c70 EFLAGS: 00010082 RAX: 0000000000000058 RBX: ffff8881f68315d0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff871f6540 RDI: ffffffff89c866e0 RBP: ffff8881f6807c88 R08: ffffed103ed05089 R09: ffffed103ed05088 R10: ffffed103ed05088 R11: ffff8881f6828447 R12: ffff8881d86ce9e0 R13: ffff8881d86ce9e0 R14: ffff8881d86ce9e0 R15: ffff8881f68315d8 FS: 00000000013d1400(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005610ea71ccc8 CR3: 00000001e6b8e002 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000010602 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: e6 00 out %al,$0x0 2: 00 00 add %al,(%rax) 4: 41 f7 c5 00 02 00 00 test $0x200,%r13d b: 0f 84 b7 00 00 00 je 0xc8 11: e8 a3 29 d5 ff callq 0xffd529b9 16: 48 83 3d 13 d3 81 06 cmpq $0x0,0x681d313(%rip) # 0x681d331 1d: 00 1e: 0f 84 cd 01 00 00 je 0x1f1 24: 4c 89 ef mov %r13,%rdi 27: 57 push %rdi 28: 9d popfq * 29: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) <-- trapping instruction 2e: 4c 8b 6d 08 mov 0x8(%rbp),%r13 32: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 37: 65 8b 05 9b 52 71 7e mov %gs:0x7e71529b(%rip),%eax # 0x7e7152d9 3e: 83 .byte 0x83