bisecting fixing commit since fb683b5e3f53a73e761952735736180939a313df
building syzkaller on 08003f6440deafc4e193b159c4acece64f7864b1
testing commit fb683b5e3f53a73e761952735736180939a313df with gcc (GCC) 8.1.0
kernel signature: a9f5d18dc2289f297bafe540960e6753aafec976dd6eb9c9167ba975e6020a78
all runs: crashed: kernel BUG at arch/x86/kvm/mmu.c:LINE!
testing current HEAD dda0e2920330128e0dbdeb11c8f25031aa40b11c
testing commit dda0e2920330128e0dbdeb11c8f25031aa40b11c with gcc (GCC) 8.1.0
kernel signature: 043f3f432722b906401379f9791542b54dbdcbfc3bd1b61ac9c9162305aa7a47
all runs: crashed: kernel BUG at arch/x86/kvm/mmu.c:LINE!
revisions tested: 2, total time: 25m44.950025211s (build: 18m37.474492401s, test: 6m6.621641162s)
the crash still happens on HEAD
commit msg: Linux 4.19.114
crash: kernel BUG at arch/x86/kvm/mmu.c:LINE!
IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): veth0_to_hsr: link is not ready
IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
------------[ cut here ]------------
kernel BUG at arch/x86/kvm/mmu.c:3279!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
IPv6: ADDRCONF(NETDEV_UP): vxcan0: link is not ready
CPU: 0 PID: 7425 Comm: syz-executor.4 Not tainted 4.19.114-syzkaller #0
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
8021q: adding VLAN 0 to HW filter on device batadv0
RIP: 0010:transparent_hugepage_adjust+0x337/0x420 arch/x86/kvm/mmu.c:3279
Code: ee 03 0f b6 04 06 84 c0 74 08 3c 03 0f 8e e4 00 00 00 8b 41 30 c1 e8 1f e9 03 ff ff ff 48 89 df e8 0e 0a 84 00 e9 fe fc ff ff <0f> 0b 48 89 c7 48 89 55 c8 48 89 4d d0 e8 f7 09 84 00 48 8b 55 c8
RSP: 0018:ffff888093c9f528 EFLAGS: 00010206
RAX: 0000000000000003 RBX: ffff888093c9f6c0 RCX: 0000000000000009
RDX: 0000000000000004 RSI: dffffc0000000000 RDI: ffff8880819808b8
RBP: ffff888093c9f568 R08: 0000000000000001 R09: 1ffff11010330112
------------[ cut here ]------------
R10: ffffed1010331791 R11: ffff88808198bc8b R12: 00000000000947a1
kernel BUG at arch/x86/kvm/mmu.c:3279!
R13: 00000000000947a3 R14: ffff88808fda0040 R15: ffff888093c9f680
FS:  00007fe9a6ab8700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000a611e000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tdp_page_fault+0x388/0x540 arch/x86/kvm/mmu.c:4196
 kvm_mmu_page_fault+0x163/0x1240 arch/x86/kvm/mmu.c:5342
 handle_ept_violation+0x16c/0x380 arch/x86/kvm/vmx.c:7717
 vmx_handle_exit+0x1b5/0x11b0 arch/x86/kvm/vmx.c:10199
 vcpu_enter_guest+0xd48/0x5120 arch/x86/kvm/x86.c:7850
 vcpu_run arch/x86/kvm/x86.c:7913 [inline]
 kvm_arch_vcpu_ioctl_run+0x2e9/0x1340 arch/x86/kvm/x86.c:8113
 kvm_vcpu_ioctl+0x535/0xb60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2667
 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: 0033:0x45a909
Code: ad 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fe9a6ab7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a909
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe9a6ab86d4
R13: 00000000004c410f R14: 00000000004d9758 R15: 00000000ffffffff
Modules linked in:
invalid opcode: 0000 [#2] PREEMPT SMP KASAN
---[ end trace a4c0596834b91309 ]---
CPU: 1 PID: 7432 Comm: syz-executor.3 Tainted: G      D           4.19.114-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:transparent_hugepage_adjust+0x337/0x420 arch/x86/kvm/mmu.c:3279
Code: ee 03 0f b6 04 06 84 c0 74 08 3c 03 0f 8e e4 00 00 00 8b 41 30 c1 e8 1f e9 03 ff ff ff 48 89 df e8 0e 0a 84 00 e9 fe fc ff ff <0f> 0b 48 89 c7 48 89 55 c8 48 89 4d d0 e8 f7 09 84 00 48 8b 55 c8
RSP: 0018:ffff888094397528 EFLAGS: 00010202
RAX: 0000000000000003 RBX: ffff8880943976c0 RCX: 0000000000000009
RDX: 0000000000000004 RSI: dffffc0000000000 RDI: ffff8880819e0978
RBP: ffff888094397568 R08: 0000000000000001 R09: 1ffff1101033c12a
R10: ffffed101033d7a9 R11: ffff8880819ebd4b R12: 000000000008c371
R13: 000000000008c373 R14: ffff8880942b8080 R15: ffff888094397680
FS:  00007f6814620700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
RIP: 0010:transparent_hugepage_adjust+0x337/0x420 arch/x86/kvm/mmu.c:3279
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000092d50000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tdp_page_fault+0x388/0x540 arch/x86/kvm/mmu.c:4196
Code: ee 03 0f b6 04 06 84 c0 74 08 3c 03 0f 8e e4 00 00 00 8b 41 30 c1 e8 1f e9 03 ff ff ff 48 89 df e8 0e 0a 84 00 e9 fe fc ff ff <0f> 0b 48 89 c7 48 89 55 c8 48 89 4d d0 e8 f7 09 84 00 48 8b 55 c8
RSP: 0018:ffff888093c9f528 EFLAGS: 00010206
 kvm_mmu_page_fault+0x163/0x1240 arch/x86/kvm/mmu.c:5342
 handle_ept_violation+0x16c/0x380 arch/x86/kvm/vmx.c:7717
RAX: 0000000000000003 RBX: ffff888093c9f6c0 RCX: 0000000000000009
 vmx_handle_exit+0x1b5/0x11b0 arch/x86/kvm/vmx.c:10199
 vcpu_enter_guest+0xd48/0x5120 arch/x86/kvm/x86.c:7850
 vcpu_run arch/x86/kvm/x86.c:7913 [inline]
 kvm_arch_vcpu_ioctl_run+0x2e9/0x1340 arch/x86/kvm/x86.c:8113
RDX: 0000000000000004 RSI: dffffc0000000000 RDI: ffff8880819808b8
 kvm_vcpu_ioctl+0x535/0xb60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2667
RBP: ffff888093c9f568 R08: 0000000000000001 R09: 1ffff11010330112
R10: ffffed1010331791 R11: ffff88808198bc8b R12: 00000000000947a1
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688
R13: 00000000000947a3 R14: ffff88808fda0040 R15: ffff888093c9f680
FS:  00007fe9a6ab8700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 __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: 0033:0x45a909
CR2: 0000000000000000 CR3: 00000000a611e000 CR4: 00000000001426f0
Code: ad 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f681461fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a909
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f68146206d4
R13: 00000000004c410f R14: 00000000004d9758 R15: 00000000ffffffff
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Modules linked in:
---[ end trace a4c0596834b9130a ]---
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
RIP: 0010:transparent_hugepage_adjust+0x337/0x420 arch/x86/kvm/mmu.c:3279