bisecting fixing commit since c9fda4f22428e09728b611ec9100157199039bfe
building syzkaller on f39aff9e4a422297d30f25d0b53f0258a445fbee
testing commit c9fda4f22428e09728b611ec9100157199039bfe with gcc (GCC) 8.1.0
kernel signature: a69c1b1be26b7cc0e3f569b4835e2e617717da050f08893acd9315b68c9b5983
all runs: crashed: kernel BUG at arch/x86/kvm/mmu.c:LINE!
testing current HEAD 98db2bf27b9ed2d5ed0b6c9c8a4bfcb127a19796
testing commit 98db2bf27b9ed2d5ed0b6c9c8a4bfcb127a19796 with gcc (GCC) 8.1.0
kernel signature: f2e8c36fd1fca24faeedda9529ba0a9c6931fc1026a06ab9a8d19a3bbe7cddd9
all runs: crashed: kernel BUG at arch/x86/kvm/mmu.c:LINE!
revisions tested: 2, total time: 23m42.401240007s (build: 16m11.293139919s, test: 6m52.557215871s)
the crash still happens on HEAD
commit msg: Linux 4.14.171
crash: kernel BUG at arch/x86/kvm/mmu.c:LINE!
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
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: 7167 Comm: syz-executor.3 Not tainted 4.14.171-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880a0868400 task.stack: ffff888080c78000
RIP: 0010:transparent_hugepage_adjust+0x2db/0x3d0 arch/x86/kvm/mmu.c:3195
RSP: 0018:ffff888080c7f738 EFLAGS: 00010206
RAX: 0000000000000003 RBX: ffff888080c7f8d0 RCX: 0000000000000009
RDX: 0000000000000004 RSI: dffffc0000000000 RDI: ffff88806f9a5790
RBP: ffff888080c7f778 R08: 0000000000000002 R09: 1ffff1100df34aed
R10: 0000000000000050 R11: ffff8880a0868400 R12: 0000000000080eab
R13: ffff888080c7f890 R14: 0000000000080eac R15: ffff8880949e0680
FS:  00007fa7bce9e700(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000098c0d000 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
------------[ cut here ]------------
kernel BUG at arch/x86/kvm/mmu.c:3195!
 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:9193
 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:00007fa7bce9dc78 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: 00007fa7bce9e6d4
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 3a b2 76 00 e9 5a fd ff ff <0f> 0b 48 89 d7 4c 89 45 d0 e8 27 b2 76 00 4c 8b 45 d0 e9 84 fe 
RIP: transparent_hugepage_adjust+0x2db/0x3d0 arch/x86/kvm/mmu.c:3195 RSP: ffff888080c7f738
invalid opcode: 0000 [#2] PREEMPT SMP KASAN
---[ end trace 402a58c588be6b6a ]---
Modules linked in:
CPU: 0 PID: 7189 Comm: syz-executor.4 Tainted: G      D         4.14.171-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880800e04c0 task.stack: ffff8880a11c0000
RIP: 0010:transparent_hugepage_adjust+0x2db/0x3d0 arch/x86/kvm/mmu.c:3195
RSP: 0018:ffff8880a11c7738 EFLAGS: 00010206
RAX: 0000000000000003 RBX: ffff8880a11c78d0 RCX: 0000000000000009