bisecting fixing commit since 13d2ce42de8cb98ff952f8de6307f896203854c2
building syzkaller on 04201c0669446145fd9c347c5538da0ca13ff29b
testing commit 13d2ce42de8cb98ff952f8de6307f896203854c2 with gcc (GCC) 8.4.1 20210217
kernel signature: 6b49b6e274bd79b41ca8cd37fb25d0fe55a6222c8e5ad8696e80b7625b00f1f3
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 handle_desc
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 handle_desc
testing current HEAD 78fec1611cbf7b0bdaddfdbf174a3a2463663bff
testing commit 78fec1611cbf7b0bdaddfdbf174a3a2463663bff with gcc (GCC) 8.4.1 20210217
kernel signature: 5c5f34fe0dd28df0d4b1d5f8500af5271d8c1054ce6136380a90c6718f022628
run #0: crashed: WARNING in corrupted
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: 21m49.251126624s (build: 14m58.70939171s, test: 6m29.141155677s)
the crash still happens on HEAD
commit msg: Linux 4.19.183
crash: WARNING in handle_desc
IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
------------[ cut here ]------------
WARNING: CPU: 0 PID: 9949 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: 9949 Comm: syz-executor.3 Not tainted 4.19.183-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
 report_bug+0x1a1/0x200 lib/bug.c:186
 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
 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 2d 87 97 f9 48 c7 c7 60 6c 03 88 c6 05 b5 9f 3a 03 01 e8 21 9d 01 00 e9 35 87 97 f9 48 c7 c7 20 68 03 88 e8 10 9d 01 00 <0f> 0b e9 60 90 97 f9 44 89 f6 48 c7 c7 80 6f 03 88 c6 05 89 9f 3a
RSP: 0018:ffff888096d2f8e8 EFLAGS: 00010282
RAX: 0000000000000024 RBX: ffff8880935a0040 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff88500a00 RDI: ffffffff8bad7720
RBP: ffff888096d2f8f0 R08: ffffed1017444e99 R09: ffffed1017444e98
R10: ffffed1017444e98 R11: ffff8880ba2274c7 R12: 000000000000002e
R13: ffff8880935a0040 R14: 0000000000000001 R15: ffff8880935a0070
 vmx_handle_exit+0x1bd/0x11b0 arch/x86/kvm/vmx.c:10168
 vcpu_enter_guest arch/x86/kvm/x86.c:7836 [inline]
 vcpu_run arch/x86/kvm/x86.c:7899 [inline]
 kvm_arch_vcpu_ioctl_run+0x23e9/0x5a10 arch/x86/kvm/x86.c:8099
IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready
 kvm_vcpu_ioctl+0x535/0xb60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2822
 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: 0033:0x465a59
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
RSP: 002b:00007f2268885188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
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: 00007fff848185af R14: 00007f2268885300 R15: 0000000000022000
Kernel Offset: disabled
Rebooting in 86400 seconds..