bisecting fixing commit since 13d2ce42de8cb98ff952f8de6307f896203854c2 building syzkaller on 04201c0669446145fd9c347c5538da0ca13ff29b testing commit 13d2ce42de8cb98ff952f8de6307f896203854c2 with gcc (GCC) 8.4.1 20210217 kernel signature: 01ab2ff6c3c2f932d1b4bc83815b65f3df4bbf7e3fcb744b8d7c32f0fc9a4df5 run #0: crashed: WARNING in handle_desc run #1: crashed: WARNING in handle_desc run #2: crashed: WARNING in handle_desc run #3: crashed: WARNING in handle_desc run #4: crashed: WARNING in handle_desc run #5: crashed: WARNING in handle_desc run #6: crashed: WARNING in handle_desc run #7: crashed: WARNING in corrupted run #8: crashed: WARNING in handle_desc run #9: crashed: WARNING in handle_desc run #10: crashed: WARNING in handle_desc run #11: crashed: WARNING in corrupted run #12: crashed: WARNING in handle_desc run #13: crashed: WARNING in handle_desc run #14: crashed: WARNING in handle_desc run #15: crashed: WARNING in handle_desc run #16: crashed: WARNING in handle_desc run #17: crashed: WARNING in handle_desc run #18: crashed: WARNING in handle_desc run #19: crashed: WARNING in corrupted testing current HEAD 1e986fe9ad15b8406034c504afc5ae76f0a8e852 testing commit 1e986fe9ad15b8406034c504afc5ae76f0a8e852 with gcc (GCC) 8.4.1 20210217 kernel signature: 24094f8d3f7c56eb04fe3bc89f8f19eb70b52ca4cd5a9bac5f28e7fb9f9ffcf6 run #0: crashed: WARNING in handle_desc run #1: crashed: WARNING in handle_desc run #2: crashed: WARNING in handle_desc run #3: crashed: WARNING in handle_desc run #4: crashed: WARNING in handle_desc run #5: crashed: WARNING in handle_desc run #6: crashed: WARNING in handle_desc run #7: crashed: WARNING in corrupted run #8: crashed: WARNING in corrupted run #9: crashed: WARNING in handle_desc revisions tested: 2, total time: 27m4.861197845s (build: 19m50.763312659s, test: 6m32.135946603s) the crash still happens on HEAD commit msg: Linux 4.19.191 crash: WARNING in handle_desc batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1 ------------[ cut here ]------------ batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! WARNING: CPU: 1 PID: 9798 at arch/x86/kvm/vmx.c:7239 handle_desc.cold.77+0xc/0x13 arch/x86/kvm/vmx.c:7239 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 9798 Comm: syz-executor.1 Not tainted 4.19.191-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+0x17c/0x226 lib/dump_stack.c:118 panic+0x1cd/0x375 kernel/panic.c:186 __warn.cold.7+0x1b/0x36 kernel/panic.c:541 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! report_bug+0x1a1/0x200 lib/bug.c:183 fixup_bug arch/x86/kernel/traps.c:178 [inline] fixup_bug arch/x86/kernel/traps.c:173 [inline] do_error_trap+0x200/0x350 arch/x86/kernel/traps.c:296 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038 RIP: 0010:handle_desc.cold.77+0xc/0x13 arch/x86/kvm/vmx.c:7239 Code: 00 e9 4d 3e 96 f9 48 c7 c7 20 6c 03 88 c6 05 35 48 39 03 01 e8 f7 9c 01 00 e9 55 3e 96 f9 48 c7 c7 e0 67 03 88 e8 e6 9c 01 00 <0f> 0b e9 80 47 96 f9 44 89 f6 48 c7 c7 40 6f 03 88 c6 05 09 48 39 RSP: 0018:ffff88809954f8e8 EFLAGS: 00010282 RAX: 0000000000000024 RBX: ffff888098f40040 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff88501f40 RDI: ffffffff8bad8720 RBP: ffff88809954f8f0 R08: ffffed1017464e99 R09: ffffed1017464e98 R10: ffffed1017464e98 R11: ffff8880ba3274c7 R12: 000000000000002e R13: ffff888098f40040 R14: 0000000000000001 R15: ffff888098f40070 vmx_handle_exit+0x1bd/0x11b0 arch/x86/kvm/vmx.c:10168 vcpu_enter_guest arch/x86/kvm/x86.c:7837 [inline] vcpu_run arch/x86/kvm/x86.c:7900 [inline] kvm_arch_vcpu_ioctl_run+0x23e9/0x5a10 arch/x86/kvm/x86.c:8100 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! kvm_vcpu_ioctl+0x535/0xb60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2822 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465a59 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 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1 RSP: 002b:00007fee78efb188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! RAX: ffffffffffffffda RBX: 000000000055bf40 RCX: 0000000000465a59 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 RBP: 00000000004af682 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000055bf40 R13: 00007fff6901ab8f R14: 00007fee78efb300 R15: 0000000000022000 Kernel Offset: disabled Rebooting in 86400 seconds..