bisecting fixing commit since c9fda4f22428e09728b611ec9100157199039bfe
building syzkaller on f39aff9e4a422297d30f25d0b53f0258a445fbee
testing commit c9fda4f22428e09728b611ec9100157199039bfe with gcc (GCC) 8.1.0
kernel signature: 24abdecb79acee2d8a81b68b84efe3707d254578
all runs: crashed: kernel BUG at arch/x86/kvm/mmu.c:LINE!
testing current HEAD 8bac50406cca10a219aa899243d49c57ddaf7c5b
testing commit 8bac50406cca10a219aa899243d49c57ddaf7c5b with gcc (GCC) 8.1.0
kernel signature: b78648971c4162b0397430c0411378bf4948ab4e
all runs: crashed: kernel BUG at arch/x86/kvm/mmu.c:LINE!
revisions tested: 2, total time: 25m12.789064121s (build: 18m3.327454565s, test: 6m26.779770759s)
the crash still happens on HEAD
commit msg: Linux 4.14.167
crash: kernel BUG at arch/x86/kvm/mmu.c:LINE!
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready
8021q: adding VLAN 0 to HW filter on device batadv0
------------[ cut here ]------------
kernel BUG at arch/x86/kvm/mmu.c:3195!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 7338 Comm: syz-executor.0 Not tainted 4.14.167-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888096394240 task.stack: ffff8880798f0000
RIP: 0010:transparent_hugepage_adjust+0x2db/0x3d0 arch/x86/kvm/mmu.c:3195
RSP: 0018:ffff8880798f7738 EFLAGS: 00010202
RAX: 0000000000000003 RBX: ffff8880798f78d0 RCX: 0000000000000009
RDX: 0000000000000004 RSI: dffffc0000000000 RDI: ffff888080327050
RBP: ffff8880798f7778 R08: 0000000000000002 R09: 1ffff11010064e05
R10: 0000000000000050 R11: ffff888096394240 R12: 000000000007572f
R13: ffff8880798f7890 R14: 0000000000075725 R15: ffff88808fde08c0
FS:  00007f797e22b700(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000077e03000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tdp_page_fault+0x359/0x510 arch/x86/kvm/mmu.c:4057
 kvm_mmu_page_fault+0xf8/0x2b0 arch/x86/kvm/mmu.c:5063
 handle_ept_violation+0x125/0x390 arch/x86/kvm/vmx.c:6918
 vmx_handle_exit+0x1b5/0x1160 arch/x86/kvm/vmx.c:9191
 vcpu_enter_guest+0xdef/0x4dc0 arch/x86/kvm/x86.c:7306
 vcpu_run arch/x86/kvm/x86.c:7369 [inline]
 kvm_arch_vcpu_ioctl_run+0x257/0xec0 arch/x86/kvm/x86.c:7536
 kvm_vcpu_ioctl+0x45e/0xb60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2661
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x180/0xfb0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x74/0x80 fs/ioctl.c:692
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a219
RSP: 002b:00007f797e22ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a219
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f797e22b6d4
R13: 00000000004c38b2 R14: 00000000004d7b70 R15: 00000000ffffffff
Code: ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e ed 00 00 00 41 8b 40 18 c1 e8 1f e9 1a ff ff ff 48 89 df e8 fa a0 76 00 e9 5a fd ff ff <0f> 0b 48 89 d7 4c 89 45 d0 e8 e7 a0 76 00 4c 8b 45 d0 e9 84 fe 
RIP: transparent_hugepage_adjust+0x2db/0x3d0 arch/x86/kvm/mmu.c:3195 RSP: ffff8880798f7738
---[ end trace 77b40f1f79f1e182 ]---