bisecting fixing commit since 7edd66cf61670d2d0c31f89cb3a247016e489a8a
building syzkaller on 0ce7569ee76fda7e5a68b0fe14c93a3e8eb7d108
testing commit 7edd66cf61670d2d0c31f89cb3a247016e489a8a with gcc (GCC) 8.1.0
kernel signature: 8acd8821e9f4783ef24a86a984f32137a3db4c84e5cd44966c2cb4d4ae3ae448
all runs: crashed: WARNING in kvm_arch_vcpu_ioctl_run
testing current HEAD a39e75458e1ceb7fefaa3a0bd9df21558713cf0d
testing commit a39e75458e1ceb7fefaa3a0bd9df21558713cf0d with gcc (GCC) 8.1.0
kernel signature: 562d71576df71bdf7cf3d6fb975d1a46d4cba64cba36f33ab3e6506d452fb048
all runs: crashed: WARNING in kvm_arch_vcpu_ioctl_run
revisions tested: 2, total time: 23m41.081716563s (build: 17m2.291178414s, test: 6m10.864327242s)
the crash still happens on HEAD
commit msg: Linux 4.19.130
crash: WARNING in kvm_arch_vcpu_ioctl_run
L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details.
faulting far call emulation tainted memory
------------[ cut here ]------------
WARNING: CPU: 0 PID: 8035 at arch/x86/kvm/x86.c:8078 kvm_arch_vcpu_ioctl_run+0x170/0x1340 arch/x86/kvm/x86.c:8078
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 8035 Comm: syz-executor.0 Not tainted 4.19.130-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:1038
RIP: 0010:kvm_arch_vcpu_ioctl_run+0x170/0x1340 arch/x86/kvm/x86.c:8078
Code: 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 78 10 00 00 49 83 bf 20 2c 00 00 00 0f 84 20 08 00 00 48 c7 c7 80 17 22 87 e8 d0 6d 41 00 <0f> 0b 48 8d 7b 01 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea
RSP: 0018:ffff888088497a98 EFLAGS: 00010282
RAX: 0000000000000024 RBX: ffff8880a9779000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff87678e80 RDI: ffffffff8a189960
RBP: ffff888088497b10 R08: ffffed1015d45079 R09: ffffed1015d45078
R10: ffffed1015d45078 R11: ffff8880aea283c7 R12: ffff8880a4760558
R13: ffff8880a47604d8 R14: ffff8880a476089c R15: ffff8880a4760480
 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: 0033:0x45c829
Code: 0d 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f8ac4088c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e7ac0 RCX: 000000000045c829
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000003c0 R14: 00000000004c6499 R15: 00007f8ac40896d4
Kernel Offset: disabled
Rebooting in 86400 seconds..