bisecting fixing commit since fb683b5e3f53a73e761952735736180939a313df
building syzkaller on 08003f6440deafc4e193b159c4acece64f7864b1
testing commit fb683b5e3f53a73e761952735736180939a313df with gcc (GCC) 8.1.0
kernel signature: bc0c0e0f8c91b9a000e0da7d663867de12af66a5
all runs: crashed: kernel BUG at arch/x86/kvm/mmu.c:LINE!
testing current HEAD cb1f9a169a0e197f93816ace48a6520e8640809d
testing commit cb1f9a169a0e197f93816ace48a6520e8640809d with gcc (GCC) 8.1.0
kernel signature: c6ad5c8385292d06cb47b032c67e5359ac0aeea2
all runs: crashed: kernel BUG at arch/x86/kvm/mmu.c:LINE!
revisions tested: 2, total time: 24m15.717623583s (build: 17m13.696138414s, test: 6m33.290153612s)
the crash still happens on HEAD
commit msg: Linux 4.19.94
crash: kernel BUG at arch/x86/kvm/mmu.c:LINE!
IPv6: ADDRCONF(NETDEV_UP): vxcan0: link is not ready
IPv6: ADDRCONF(NETDEV_UP): vxcan0: link is not ready
IPv6: ADDRCONF(NETDEV_UP): vxcan0: link is not ready
------------[ cut here ]------------
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
kernel BUG at arch/x86/kvm/mmu.c:3279!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready
CPU: 1 PID: 7187 Comm: syz-executor.2 Not tainted 4.19.94-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 8e d3 83 00 e9 fe fc ff ff <0f> 0b 48 89 c7 48 89 55 c8 48 89 4d d0 e8 77 d3 83 00 48 8b 55 c8
RSP: 0018:ffff88808f047528 EFLAGS: 00010202
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_team: link becomes ready
RAX: 0000000000000003 RBX: ffff88808f0476c0 RCX: 0000000000000009
RDX: 0000000000000004 RSI: dffffc0000000000 RDI: ffff888080aa08b8
RBP: ffff88808f047568 R08: 0000000000000001 R09: 1ffff11010154112
R10: ffffed1010155791 R11: ffff888080aabc8b R12: 0000000000080a71
R13: 0000000000080a73 R14: ffff888082e50040 R15: ffff88808f047680
FS:  00007fc250f68700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000094180000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready
 tdp_page_fault+0x388/0x540 arch/x86/kvm/mmu.c:4185
 kvm_mmu_page_fault+0x163/0x1240 arch/x86/kvm/mmu.c:5331
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready
 handle_ept_violation+0x16c/0x380 arch/x86/kvm/vmx.c:7689
 vmx_handle_exit+0x1b5/0x11b0 arch/x86/kvm/vmx.c:10175
 vcpu_enter_guest+0xd48/0x5120 arch/x86/kvm/x86.c:7809
IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready
 vcpu_run arch/x86/kvm/x86.c:7872 [inline]
 kvm_arch_vcpu_ioctl_run+0x2e9/0x1340 arch/x86/kvm/x86.c:8072
 kvm_vcpu_ioctl+0x535/0xb60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2667
IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688
IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready
 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
IPv6: ADDRCONF(NETDEV_UP): veth1_to_hsr: link is not ready
RIP: 0033:0x45a909
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
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
8021q: adding VLAN 0 to HW filter on device batadv0
RSP: 002b:00007fc250f67c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a909
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
kobject: 'vlan0' (000000002d22758b): kobject_add_internal: parent: 'mesh', set: '<NULL>'
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc250f686d4
R13: 00000000004c410f R14: 00000000004d9758 R15: 00000000ffffffff
Modules linked in:
---[ end trace dafced4ab7f5a238 ]---
kobject: 'loop5' (00000000edc247e2): kobject_uevent_env
RIP: 0010:transparent_hugepage_adjust+0x337/0x420 arch/x86/kvm/mmu.c:3279
kobject: 'loop5' (00000000edc247e2): fill_kobj_path: path = '/devices/virtual/block/loop5'
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 8e d3 83 00 e9 fe fc ff ff <0f> 0b 48 89 c7 48 89 55 c8 48 89 4d d0 e8 77 d3 83 00 48 8b 55 c8
RSP: 0018:ffff88808f047528 EFLAGS: 00010202
RAX: 0000000000000003 RBX: ffff88808f0476c0 RCX: 0000000000000009
RDX: 0000000000000004 RSI: dffffc0000000000 RDI: ffff888080aa08b8
RBP: ffff88808f047568 R08: 0000000000000001 R09: 1ffff11010154112
R10: ffffed1010155791 R11: ffff888080aabc8b R12: 0000000000080a71
R13: 0000000000080a73 R14: ffff888082e50040 R15: ffff88808f047680
kobject: 'kvm' (00000000f9a16c03): kobject_uevent_env
FS:  00007fc250f68700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000094180000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400