bisecting fixing commit since 13d2ce42de8cb98ff952f8de6307f896203854c2 building syzkaller on 04201c0669446145fd9c347c5538da0ca13ff29b testing commit 13d2ce42de8cb98ff952f8de6307f896203854c2 with gcc (GCC) 8.1.0 kernel signature: 00fb114edbb49c55c0eb2e987fbc376a253a7dd2125ecbb81b86ac1316338110 all runs: crashed: WARNING in handle_desc testing current HEAD 675cc038067f0e530471c56a7442935f84669d95 testing commit 675cc038067f0e530471c56a7442935f84669d95 with gcc (GCC) 8.1.0 kernel signature: 6bac516c9e84fff7caa883623e7c5020204be926dd1d3626188d7f73278a474e run #0: crashed: WARNING in handle_desc run #1: crashed: WARNING in handle_desc run #2: crashed: WARNING in corrupted 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 handle_desc run #8: crashed: WARNING in handle_desc run #9: crashed: WARNING in handle_desc revisions tested: 2, total time: 23m46.952835996s (build: 17m17.279030324s, test: 5m52.137754596s) the crash still happens on HEAD commit msg: Linux 4.19.167 crash: WARNING in handle_desc wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 ------------[ cut here ]------------ wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready WARNING: CPU: 0 PID: 9899 at arch/x86/kvm/vmx.c:7239 handle_desc.cold.77+0xc/0x13 arch/x86/kvm/vmx.c:7239 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 9899 Comm: syz-executor.2 Not tainted 4.19.167-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/0x22a lib/dump_stack.c:118 panic+0x1cd/0x375 kernel/panic.c:186 __warn.cold.7+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:1038 RIP: 0010:handle_desc.cold.77+0xc/0x13 arch/x86/kvm/vmx.c:7239 Code: 00 e9 f6 c6 fc ff 48 c7 c7 a0 6c 03 88 c6 05 de 9b 9f 09 01 e8 3e d5 30 00 e9 fe c6 fc ff 48 c7 c7 60 68 03 88 e8 2d d5 30 00 <0f> 0b e9 29 d0 fc ff 44 89 f6 48 c7 c7 c0 6f 03 88 c6 05 b2 9b 9f RSP: 0018:ffff8880b32a78e8 EFLAGS: 00010282 RAX: 0000000000000024 RBX: ffff88809e430040 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff88500600 RDI: ffffffff8bad76e0 RBP: ffff8880b32a78f0 R08: ffffed1017444e99 R09: ffffed1017444e98 R10: ffffed1017444e98 R11: ffff8880ba2274c7 R12: 000000000000002e R13: ffff88809e430040 R14: ffff88809e430070 R15: dffffc0000000000 vmx_handle_exit+0x1bd/0x11b0 arch/x86/kvm/vmx.c:10168 vcpu_enter_guest arch/x86/kvm/x86.c:7831 [inline] vcpu_run arch/x86/kvm/x86.c:7894 [inline] kvm_arch_vcpu_ioctl_run+0x1fe3/0x5a50 arch/x86/kvm/x86.c:8094 kvm_vcpu_ioctl+0x535/0xb60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2823 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 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: 0033:0x45e149 Code: 0d b4 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f95f68fbc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e149 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007fff4bf07a5f R14: 00007f95f68fc9c0 R15: 000000000119bf8c Kernel Offset: disabled Rebooting in 86400 seconds..