bisecting fixing commit since fb683b5e3f53a73e761952735736180939a313df
building syzkaller on 08003f6440deafc4e193b159c4acece64f7864b1
testing commit fb683b5e3f53a73e761952735736180939a313df with gcc (GCC) 8.1.0
kernel signature: d1b837c20804b98690a338bf66ef0f9488e5cfd9a6f918860b46f2c4c43957b2
all runs: crashed: kernel BUG at arch/x86/kvm/mmu.c:LINE!
testing current HEAD a87f96283793d58b042618c689630db264715274
testing commit a87f96283793d58b042618c689630db264715274 with gcc (GCC) 8.1.0
kernel signature: b2c25c8784a2a6e13b27ecc55c6ac6a0240a2a2329eb8e7784c839706bab656b
all runs: crashed: kernel BUG at arch/x86/kvm/mmu.c:LINE!
revisions tested: 2, total time: 22m59.390762768s (build: 16m22.493821791s, test: 5m52.758690881s)
the crash still happens on HEAD
commit msg: Linux 4.19.145
crash: kernel BUG at arch/x86/kvm/mmu.c:LINE!
L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details.
bridge0: port 1(bridge_slave_0) entered blocking state
bridge0: port 1(bridge_slave_0) entered forwarding state
------------[ cut here ]------------
IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
kernel BUG at arch/x86/kvm/mmu.c:3311!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
CPU: 1 PID: 7432 Comm: syz-executor.2 Not tainted 4.19.145-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:3311
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 9e ac 84 00 e9 fe fc ff ff <0f> 0b 48 89 c7 48 89 55 c8 48 89 4d d0 e8 87 ac 84 00 48 8b 55 c8
IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
RSP: 0018:ffff88808eb874e8 EFLAGS: 00010202
RAX: 0000000000000003 RBX: ffff88808eb87680 RCX: 0000000000000009
RDX: 0000000000000004 RSI: ffff888081a00888 RDI: ffff888081a008b8
RBP: ffff88808eb87528 R08: ffff888081a0bc88 R09: dffffc0000000000
R10: 1ffff11010340112 R11: ffff888081a0bc8b R12: 0000000000080eb1
R13: 0000000000080eb3 R14: ffff888092498040 R15: ffff88808eb87640
FS:  00007fc563814700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000935b6000 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:4228
 kvm_mmu_page_fault+0x163/0x1240 arch/x86/kvm/mmu.c:5374
 handle_ept_violation+0x16c/0x380 arch/x86/kvm/vmx.c:7685
 vmx_handle_exit+0x1b5/0x11b0 arch/x86/kvm/vmx.c:10167
 vcpu_enter_guest+0xd4b/0x50a0 arch/x86/kvm/x86.c:7822
 vcpu_run arch/x86/kvm/x86.c:7885 [inline]
 kvm_arch_vcpu_ioctl_run+0x2e9/0x1340 arch/x86/kvm/x86.c:8085
 kvm_vcpu_ioctl+0x535/0xb60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2822
 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: 0033:0x45a989
Code: 2d 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 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fc563813c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a989
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc5638146d4
R13: 00000000004c418f R14: 00000000004d97d8 R15: 00000000ffffffff
Modules linked in:
---[ end trace c77a0877333de684 ]---
RIP: 0010:transparent_hugepage_adjust+0x337/0x420 arch/x86/kvm/mmu.c:3311
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 9e ac 84 00 e9 fe fc ff ff <0f> 0b 48 89 c7 48 89 55 c8 48 89 4d d0 e8 87 ac 84 00 48 8b 55 c8
RSP: 0018:ffff88808eb874e8 EFLAGS: 00010202
RAX: 0000000000000003 RBX: ffff88808eb87680 RCX: 0000000000000009
RDX: 0000000000000004 RSI: ffff888081a00888 RDI: ffff888081a008b8
RBP: ffff88808eb87528 R08: ffff888081a0bc88 R09: dffffc0000000000
R10: 1ffff11010340112 R11: ffff888081a0bc8b R12: 0000000000080eb1
R13: 0000000000080eb3 R14: ffff888092498040 R15: ffff88808eb87640
FS:  00007fc563814700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000935b6000 CR4: 00000000001426e0
IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready