bisecting fixing commit since aec3002d07fd2564cd32e56f126fa6db14a168bb building syzkaller on 907bf74686129436f81aa40336ee89f7cc01b0b4 testing commit aec3002d07fd2564cd32e56f126fa6db14a168bb with gcc (GCC) 8.1.0 kernel signature: 7e35542e5ac35ef91d7fb1857f61ddb6d6912720969164d8ad38a8dce0a23eef all runs: crashed: WARNING in perf_group_attach testing current HEAD c4ff839de17f38b0ae0f8983b5c5186f8a389238 testing commit c4ff839de17f38b0ae0f8983b5c5186f8a389238 with gcc (GCC) 8.1.0 kernel signature: c9ce62b4fcfc6d6180434588f63cccc39b967c1fdd4bc83c9112752beefe7909 all runs: crashed: WARNING in perf_group_attach revisions tested: 2, total time: 25m51.080992805s (build: 18m29.751519087s, test: 6m13.590013807s) the crash still happens on HEAD commit msg: Linux 4.19.171 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 WARNING: CPU: 0 PID: 7310 at kernel/events/core.c:1840 perf_group_attach+0x3b1/0x470 kernel/events/core.c:1832 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 7310 Comm: syz-executor.3 Not tainted 4.19.171-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+0x123/0x171 lib/dump_stack.c:118 panic+0x1cd/0x375 kernel/panic.c:186 __warn.cold.8+0x1b/0x36 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:1038 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 de 5c 1d 00 e9 c8 fc ff ff e8 d4 5c 1d 00 e9 fe fc ff ff <0f> 0b e9 75 fd ff ff e8 e3 5c 1d 00 eb c1 e8 dc 5c 1d 00 e9 6d fc RSP: 0018:ffff8881f6807ec0 EFLAGS: 00010006 RAX: dffffc0000000000 RBX: ffff8881e80d5240 RCX: 1ffff1103b2269ca RDX: 1ffff1103b2269f3 RSI: ffff8881f6831460 RDI: ffff8881d9134f98 RBP: ffff8881f6807ef0 R08: ffffffff890a5018 R09: 0000000000000006 R10: fffffbfff1214a01 R11: 0000000000000001 R12: ffff8881d9134d80 R13: ffffe8ffffc11bd0 R14: 0000000000000000 R15: ffff8881f6831448 add_event_to_ctx kernel/events/core.c:2398 [inline] __perf_install_in_context+0x3f6/0x860 kernel/events/core.c:2539 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/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 63 46 d5 ff 48 83 3d 23 39 82 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 2b ba 71 7e 83 RSP: 0018:ffff8881c61f7848 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff04 RAX: 0000000000000007 RBX: ffff8881f652f500 RCX: 1ffff1103a32a175 RDX: 0000000000000000 RSI: ffff8881d1950b88 RDI: 0000000000000282 RBP: ffff8881c61f7868 R08: ffff8881d1950ba8 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881e6f8fd20 R13: 0000000000000282 R14: ffffffff8188e233 R15: dffffc0000000000 anon_vma_chain_free mm/rmap.c:134 [inline] unlink_anon_vmas+0x253/0x760 mm/rmap.c:401 free_pgtables+0xbd/0x310 mm/memory.c:638 exit_mmap+0x260/0x470 mm/mmap.c:3094 __mmput kernel/fork.c:1015 [inline] mmput+0x107/0x3f0 kernel/fork.c:1036 exit_mm kernel/exit.c:549 [inline] do_exit+0x9f1/0x2d70 kernel/exit.c:877 do_group_exit+0xf4/0x2f0 kernel/exit.c:993 get_signal+0x313/0x1a30 kernel/signal.c:2589 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: 0033:0x459599 Code: Bad RIP value. RSP: 002b:00007ffbcd91cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: 0000000000000003 RBX: 0000000000000005 RCX: 0000000000459599 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000020000200 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 00007ffbcd91d6d4 R13: 00000000004c61fd R14: 00000000004dae88 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds..