bisecting fixing commit since c9fda4f22428e09728b611ec9100157199039bfe
building syzkaller on f39aff9e4a422297d30f25d0b53f0258a445fbee
testing commit c9fda4f22428e09728b611ec9100157199039bfe with gcc (GCC) 8.1.0
kernel signature: 1142c020984ea5bf3a727cd58afedc02ee4df9f0c3b6addc2145904851739b90
all runs: crashed: kernel BUG at arch/x86/kvm/mmu.c:LINE!
testing current HEAD c10b57a567e4333b9fdf60b5ec36de9859263ca2
testing commit c10b57a567e4333b9fdf60b5ec36de9859263ca2 with gcc (GCC) 8.1.0
kernel signature: de3bb7e97a50f49843218f8dc7144f1fb6408514fd03315cb3c39966ae3abae2
all runs: crashed: kernel BUG at arch/x86/kvm/mmu.c:LINE!
revisions tested: 2, total time: 24m12.290809136s (build: 16m45.657428159s, test: 6m18.689141797s)
the crash still happens on HEAD
commit msg: Linux 4.14.176
crash: kernel BUG at arch/x86/kvm/mmu.c:LINE!
IPv6: ADDRCONF(NETDEV_UP): vxcan0: link is not ready
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
------------[ cut here ]------------
kernel BUG at arch/x86/kvm/mmu.c:3195!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 7262 Comm: syz-executor.3 Not tainted 4.14.176-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880a8358000 task.stack: ffff8880a8120000
RIP: 0010:transparent_hugepage_adjust+0x2db/0x3d0 arch/x86/kvm/mmu.c:3195
RSP: 0018:ffff8880a8127738 EFLAGS: 00010206
RAX: 0000000000000003 RBX: ffff8880a81278d0 RCX: 0000000000000009
RDX: 0000000000000004 RSI: dffffc0000000000 RDI: ffff888076d028d0
RBP: ffff8880a8127778 R08: 0000000000000002 R09: 1ffff1100eda0515
R10: 0000000000000050 R11: ffff8880a8358000 R12: 00000000000854c8
R13: ffff8880a8127890 R14: 00000000000854cf R15: ffff888089db0300
FS:  00007f481d856700(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000a8ac3000 CR4: 00000000001426f0
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:6946
 vmx_handle_exit+0x1b5/0x1160 arch/x86/kvm/vmx.c:9215
 vcpu_enter_guest+0xdef/0x4dc0 arch/x86/kvm/x86.c:7316
 vcpu_run arch/x86/kvm/x86.c:7379 [inline]
 kvm_arch_vcpu_ioctl_run+0x257/0xec0 arch/x86/kvm/x86.c:7546
 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:00007f481d855c78 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: 00007f481d8566d4
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 0a b5 76 00 e9 5a fd ff ff <0f> 0b 48 89 d7 4c 89 45 d0 e8 f7 b4 76 00 4c 8b 45 d0 e9 84 fe 
RIP: transparent_hugepage_adjust+0x2db/0x3d0 arch/x86/kvm/mmu.c:3195 RSP: ffff8880a8127738
---[ end trace ddbf412283b80e5d ]---