bisecting fixing commit since 7edd66cf61670d2d0c31f89cb3a247016e489a8a
building syzkaller on 0ce7569ee76fda7e5a68b0fe14c93a3e8eb7d108
testing commit 7edd66cf61670d2d0c31f89cb3a247016e489a8a with gcc (GCC) 8.1.0
kernel signature: 87f8f107d35c48bd08a2b46920f5b436fe3695306f5a8bf501590b94aec40136
all runs: crashed: WARNING in kvm_arch_vcpu_ioctl_run
testing current HEAD c14d30dc9987047b439b03d6e6db7d54d9f7f180
testing commit c14d30dc9987047b439b03d6e6db7d54d9f7f180 with gcc (GCC) 8.1.0
kernel signature: f8d3047d5b992d81c5e355d204edd2b166e31ad0536fafdef0a1128b77ca1362
all runs: crashed: WARNING in kvm_arch_vcpu_ioctl_run
revisions tested: 2, total time: 26m0.499129379s (build: 18m26.456967782s, test: 6m23.776928636s)
the crash still happens on HEAD
commit msg: Linux 4.19.139
crash: WARNING in kvm_arch_vcpu_ioctl_run
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
------------[ cut here ]------------
WARNING: CPU: 1 PID: 8198 at arch/x86/kvm/x86.c:8080 kvm_arch_vcpu_ioctl_run+0x170/0x1340 arch/x86/kvm/x86.c:8080
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 8198 Comm: syz-executor.5 Not tainted 4.19.139-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:8080
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 40 71 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:ffff88809866fa98 EFLAGS: 00010282
RAX: 0000000000000024 RBX: ffff88808bcef000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff87679040 RDI: ffffffff8a18a960
RBP: ffff88809866fb10 R08: ffffed1015d65079 R09: ffffed1015d65078
R10: ffffed1015d65078 R11: ffff8880aeb283c7 R12: ffff88809f4b0a18
R13: ffff88809f4b0998 R14: ffff88809f4b0d5c R15: ffff88809f4b0940
 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: 0033:0x45c8a9
Code: 8d b6 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 5b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ff553892c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e7b40 RCX: 000000000045c8a9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000003c0 R14: 00000000004c6519 R15: 00007ff5538936d4
Kernel Offset: disabled
Rebooting in 86400 seconds..