2017-10-31 17:59 GMT+08:00 Dmitry Vyukov <dvyukov@xxxxxxxxxx>: > Hello, > > I am seeing the following crash on upstream > 15f859ae5c43c7f0a064ed92d33f7a5bc5de6de0 (Oct 26). > Reproducer: > https://gist.githubusercontent.com/dvyukov/a9690f90c39c1e3b1b6c7acda2d5ef89/raw/33e07f3d6779005fc475764e0802e4a5aee8d0cf/gistfile1.txt > I run qemu with -append "kvm-intel.nested=1" -enable-kvm -cpu host. My > host cpu is E5-2690. > I can't reproduce this w/ latest kvm/queue in both L0 and L1. In addition, there is a commit tries to fix cr4 recently. https://git.kernel.org/pub/scm/virt/kvm/kvm.git/commit/?id=8eb3f87d903168bdbd1222776a6b1e281f50513e The testcast is complex, if the below strace log is as you expected? execve("./a.out", ["./a.out"], [/* 32 vars */]) = 0 uname({sysname="Linux", nodename="kernel", ...}) = 0 brk(NULL) = 0x1d42000 brk(0x1d431c0) = 0x1d431c0 arch_prctl(ARCH_SET_FS, 0x1d42880) = 0 readlink("/proc/self/exe", "/home/kernel/a.out", 4096) = 18 brk(0x1d641c0) = 0x1d641c0 brk(0x1d65000) = 0x1d65000 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) mmap(0x20000000, 11481088, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000 openat(AT_FDCWD, "/dev/kvm", O_WRONLY) = 3 ioctl(3, KVM_CREATE_VM or LOGGER_GET_LOG_BUF_SIZE, 0) = 4 ioctl(4, KVM_CREATE_VCPU, 0) = 5 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1230) = 0 ioctl(4, KVM_SET_USER_MEMORY_REGION, 0x7fff5e6c1170) = 0 ioctl(5, KVM_GET_SREGS, 0x7fff5e6c1330) = 0 open("/dev/kvm", O_RDWR) = 6 ioctl(6, KVM_GET_SUPPORTED_CPUID, 0x7fff5e6c1470) = 0 ioctl(5, KVM_SET_CPUID2, 0x7fff5e6c1470) = 0 close(6) = 0 ioctl(5, KVM_SET_MSRS, 0x7fff5e6c0c30) = 5 ioctl(5, KVM_SET_SREGS, 0x7fff5e6c1330) = 0 ioctl(5, KVM_SET_REGS, 0x7fff5e6c1230) = 0 mremap(0x20998000, 4096, 16384, MREMAP_MAYMOVE|MREMAP_FIXED, 0x200fa000) = 0x200fa000 ioctl(5, KVM_RUN, 0) = 0 mbind(0x20000000, 8192, MPOL_DEFAULT 0x20001ff8, 2, MPOL_MF_MOVE) = 0 exit_group(0) = ? +++ exited with 0 +++ i Regards, Wanpeng Li > general protection fault: 0000 [#1] SMP KASAN > Modules linked in: > CPU: 1 PID: 3064 Comm: a.out Not tainted 4.14.0-rc6+ #11 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > task: ffff880064c203c0 task.stack: ffff880066718000 > RIP: 0010:native_write_cr4+0x4/0x10 arch/x86/include/asm/special_insns.h:75 > RSP: 0018:ffff88006671f598 EFLAGS: 00010097 > RAX: ffff880064c203c0 RBX: 00000000001606e0 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000001606e0 > RBP: ffff88006671f598 R08: 0000000000000006 R09: 0000000000000006 > R10: ffff880064c203c0 R11: 0000000000000000 R12: 0000000000000001 > R13: ffff88006ca94828 R14: ffff88006ca94850 R15: ffff88006ca80000 > FS: 00000000019cd880(0000) GS:ffff88006ca80000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000000000000 CR3: 0000000005a22001 CR4: 00000000001626e0 > Call Trace: > __write_cr4 arch/x86/include/asm/paravirt.h:76 [inline] > cr4_clear_bits arch/x86/include/asm/tlbflush.h:197 [inline] > kvm_cpu_vmxoff arch/x86/kvm/vmx.c:3571 [inline] > hardware_disable+0x197/0x210 arch/x86/kvm/vmx.c:3577 > kvm_arch_hardware_disable+0x35/0xd0 arch/x86/kvm/x86.c:7920 > hardware_disable_nolock+0x30/0x40 > arch/x86/kvm/../../../virt/kvm/kvm_main.c:3282 > on_each_cpu+0xca/0x1b0 kernel/smp.c:604 > hardware_disable_all_nolock+0x44/0x60 > arch/x86/kvm/../../../virt/kvm/kvm_main.c:3300 > hardware_disable_all arch/x86/kvm/../../../virt/kvm/kvm_main.c:3306 [inline] > kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:735 [inline] > kvm_put_kvm+0x887/0xe00 arch/x86/kvm/../../../virt/kvm/kvm_main.c:748 > kvm_vm_release+0x42/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:759 > __fput+0x301/0x7e0 fs/file_table.c:210 > ____fput+0x15/0x20 fs/file_table.c:244 > task_work_run+0x19e/0x250 kernel/task_work.c:112 > exit_task_work include/linux/task_work.h:21 [inline] > do_exit+0x99f/0x18b0 kernel/exit.c:865 > do_group_exit+0x14b/0x3f0 kernel/exit.c:968 > SYSC_exit_group kernel/exit.c:979 [inline] > SyS_exit_group+0x1d/0x20 kernel/exit.c:977 > entry_SYSCALL_64_fastpath+0x1f/0xbe > RIP: 0033:0x443849 > RSP: 002b:00007ffe58a95c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 > RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000443849 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: 0000000000000086 R08: 000000000000003c R09: 00000000000000e7 > R10: ffffffffffffffc0 R11: 0000000000000246 R12: 0000000000000000 > R13: 0000000000404800 R14: 0000000000404890 R15: 0000000000000000 > Code: 0f 1f 80 00 00 00 00 55 48 89 e5 0f 20 d8 5d c3 0f 1f 80 00 00 > 00 00 55 48 89 e5 0f 22 df 5d c3 0f 1f 80 00 00 00 00 55 48 89 e5 <0f> > 22 e7 5d c3 0f 1f 80 00 00 00 00 55 48 89 e5 44 0f 20 c0 5d > RIP: native_write_cr4+0x4/0x10 arch/x86/include/asm/special_insns.h:75 > RSP: ffff88006671f598 > ---[ end trace 6f9dbcc14aa47936 ]---
