bisecting fixing commit since aec3002d07fd2564cd32e56f126fa6db14a168bb building syzkaller on 907bf74686129436f81aa40336ee89f7cc01b0b4 testing commit aec3002d07fd2564cd32e56f126fa6db14a168bb with gcc (GCC) 8.1.0 kernel signature: 4e89c705292d15e3a2f7538f470368cba4d630cc all runs: crashed: WARNING in perf_group_attach testing current HEAD c7ecf3e3a71c216327980f26b1e895ce9b07ad31 testing commit c7ecf3e3a71c216327980f26b1e895ce9b07ad31 with gcc (GCC) 8.1.0 kernel signature: 80840762a945add3443912f49d9b99e587ad7775 all runs: crashed: WARNING in perf_group_attach revisions tested: 2, total time: 24m36.362636442s (build: 17m22.893649232s, test: 6m22.14486667s) the crash still happens on HEAD commit msg: Linux 4.19.92 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: 7174 at kernel/events/core.c:1833 perf_group_attach+0x3b1/0x470 kernel/events/core.c:1825 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 7174 Comm: syz-executor.5 Not tainted 4.19.92-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: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 8e 79 1d 00 e9 c8 fc ff ff e8 84 79 1d 00 e9 fe fc ff ff <0f> 0b e9 75 fd ff ff e8 93 79 1d 00 eb c1 e8 8c 79 1d 00 e9 6d fc RSP: 0018:ffff8880aea07ec0 EFLAGS: 00010002 RAX: dffffc0000000000 RBX: ffff888090c4cbc0 RCX: 1ffff11012189aa2 RDX: 1ffff11012189acb RSI: ffff8880aea312e0 RDI: ffff888090c4d658 RBP: ffff8880aea07ef0 R08: ffffffff88e9f018 R09: 0000000000000006 R10: fffffbfff11d3e01 R11: 0000000000000001 R12: ffff888090c4d440 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+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:do_raw_spin_lock+0x13b/0x230 kernel/locking/spinlock_debug.c:115 Code: 00 00 00 fc ff df 48 c1 ea 03 65 4c 8b 24 25 40 ee 01 00 80 3c 02 00 0f 85 d7 00 00 00 4c 89 63 10 48 83 c4 08 5b 41 5c 41 5d <41> 5e 5d c3 e8 8c 88 a2 01 85 c0 0f 84 68 ff ff ff 48 c7 c6 40 35 RSP: 0018:ffff8880a921f708 EFLAGS: 00000296 ORIG_RAX: ffffffffffffff04 RAX: dffffc0000000000 RBX: ffff888090c2ed10 RCX: ffffffff814c99b1 RDX: 1ffff11012185da4 RSI: 0000000000000004 RDI: ffff888090c2ed10 RBP: ffff8880a921f710 R08: ffffed1012185da3 R09: ffffed1012185da2 R10: ffffed1012185da2 R11: ffff888090c2ed13 R12: ffff888090c2ed10 R13: 0000000000400000 R14: 0000000000000000 R15: dffffc0000000000 __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_lock+0x35/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] zap_pte_range mm/memory.c:1299 [inline] zap_pmd_range mm/memory.c:1440 [inline] zap_pud_range mm/memory.c:1469 [inline] zap_p4d_range mm/memory.c:1490 [inline] unmap_page_range+0x608/0x1890 mm/memory.c:1511 unmap_single_vma+0x121/0x300 mm/memory.c:1556 unmap_vmas+0xe7/0x1a0 mm/memory.c:1586 exit_mmap+0x251/0x450 mm/mmap.c:3097 __mmput kernel/fork.c:1005 [inline] mmput+0x107/0x3f0 kernel/fork.c:1026 exit_mm kernel/exit.c:546 [inline] do_exit+0x981/0x2d40 kernel/exit.c:863 do_group_exit+0xf4/0x2f0 kernel/exit.c:979 get_signal+0x313/0x1a00 kernel/signal.c:2578 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:00007f129c5d1cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000075bf28 RCX: 0000000000459519 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075bf28 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075bf2c R13: 00007ffd8c57698f R14: 00007f129c5d29c0 R15: 000000000075bf2c Kernel Offset: disabled Rebooting in 86400 seconds..