[Bug 203845] New: Can't run qemu/kvm on 5.0.0 kernel (NULL pointer dereference)

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=203845

            Bug ID: 203845
           Summary: Can't run qemu/kvm on 5.0.0 kernel (NULL pointer
                    dereference)
           Product: Virtualization
           Version: unspecified
    Kernel Version: 5.0.0
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
          Assignee: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: jpalecek@web.de
        Regression: No

Hello,

I can't start a linux system (for autopkgtest testing) using kvm on an AMD
system. The qemu process is just killed after ioctl(..., KVM_RUN). In dmesg, I
see:

[54998.896817] BUG: unable to handle kernel NULL pointer dereference at
00000000
[54998.896823] #PF error: [WRITE]
[54998.896826] *pdpt = 0000000011b11001 *pde = 0000000000000000 
[54998.896831] Oops: 0002 [#9] SMP NOPTI
[54998.896836] CPU: 0 PID: 5289 Comm: qemu-system-i38 Tainted: P      D    OE  
  5.0.0-trunk-686-pae #1 Debian 5.0.2-1~exp1
[54998.896839] Hardware name: System manufacturer System Product Name/M4N68T-M,
BIOS 1301    07/05/2011
[54998.896864] EIP: kvm_mmu_load+0xbc/0x4b0 [kvm]
[54998.896868] Code: 81 c1 00 00 00 40 c6 00 00 0f 1f 00 8b 87 60 02 00 00 8b
55 e8 83 c9 01 81 c3 00 00 04 00 83 d6 00 83 c4 10 8b 80 88 00 00 00 <89> 0c 10
c7 44 10 04 00 00 00 00 83 c2 08 89 55 e8 83 fa 20 75 89
[54998.896871] EAX: 00000000 EBX: 00040000 ECX: 0dc1d001 EDX: 00000000
[54998.896874] ESI: 00000000 EDI: cdf58000 EBP: cf811de0 ESP: cf811dbc
[54998.896876] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00210282
[54998.896878] CR0: 80050033 CR2: 00000000 CR3: 22de02e0 CR4: 000006f0
[54998.896880] Call Trace:
[54998.896900]  ? kvm_ioapic_scan_entry+0x62/0xe0 [kvm]
[54998.896919]  kvm_arch_vcpu_ioctl_run+0x105f/0x1a20 [kvm]
[54998.896925]  ? _cond_resched+0x17/0x30
[54998.896943]  kvm_vcpu_ioctl+0x214/0x590 [kvm]
[54998.896959]  ? kvm_vcpu_ioctl+0x214/0x590 [kvm]
[54998.896964]  ? do_futex+0xae/0xa70
[54998.896969]  ? __fpu__restore_sig+0x265/0x500
[54998.896985]  ? __bpf_trace_kvm_async_pf_nopresent_ready+0x20/0x20 [kvm]
[54998.896988]  do_vfs_ioctl+0x9a/0x6c0
[54998.896993]  ? __audit_syscall_entry+0xb4/0xf0
[54998.896997]  ? syscall_trace_enter+0x1da/0x240
[54998.897000]  ksys_ioctl+0x56/0x80
[54998.897002]  sys_ioctl+0x16/0x20
[54998.897005]  do_fast_syscall_32+0x81/0x184
[54998.897009]  entry_SYSENTER_32+0x6b/0xbe
[54998.897011] EIP: 0xb7f49881
[54998.897014] Code: 8b 98 58 cd ff ff 89 c8 85 d2 74 02 89 0a 5b 5d c3 8b 04
24 c3 8b 14 24 c3 8b 34 24 c3 8b 3c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59
c3 90 90 90 90 8d 76 00 58 b8 77 00 00 00 cd 80 90 8d 76
[54998.897016] EAX: ffffffda EBX: 0000000e ECX: 0000ae80 EDX: 00000000
[54998.897018] ESI: 0261b080 EDI: 00000000 EBP: b51cf000 ESP: b30fdc98
[54998.897021] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: 00200292
[54998.897024] Modules linked in: cfg80211 nfnetlink_queue nfnetlink_log
nfnetlink bluetooth drbg ansi_cprng ecdh_generic rfkill snd_hrtimer
snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device
cpufreq_powersave cpufreq_userspace cpufreq_conservative binfmt_misc
nvidia_drm(POE) drm_kms_helper drm nvidia_modeset(POE) nvidia(POE) fuse
snd_hda_codec_via nls_iso8859_2 nls_cp437 vfat snd_hda_codec_generic
snd_hda_codec_hdmi ledtrig_audio fat snd_hda_intel edac_mce_amd snd_hda_codec
kvm_amd snd_hda_core snd_hwdep kvm snd_pcm_oss sr_mod snd_mixer_oss snd_pcm
cdrom snd_timer sg irqbypass snd k10temp soundcore pcspkr asus_atk0110 ohci_pci
ohci_hcd pcc_cpufreq sata_nv ehci_pci forcedeth acpi_cpufreq i2c_nforce2
ehci_hcd button ipmi_devintf ipmi_msghandler usblp usbcore usb_common
parport_pc ppdev lp parport ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2
crc32c_generic fscrypto ecb crypto_simd cryptd aes_i586 sd_mod pata_amd
ata_generic libata psmouse evdev serio_raw scsi_mod
[54998.897072] CR2: 0000000000000000
[54998.897075] ---[ end trace a515b8f5e69d047e ]---
[54998.897093] EIP: kvm_mmu_load+0xbc/0x4b0 [kvm]
[54998.897096] Code: 81 c1 00 00 00 40 c6 00 00 0f 1f 00 8b 87 60 02 00 00 8b
55 e8 83 c9 01 81 c3 00 00 04 00 83 d6 00 83 c4 10 8b 80 88 00 00 00 <89> 0c 10
c7 44 10 04 00 00 00 00 83 c2 08 89 55 e8 83 fa 20 75 89
[54998.897098] EAX: 00000000 EBX: 00040000 ECX: 0facd001 EDX: 00000000
[54998.897100] ESI: 00000000 EDI: cd06b0c0 EBP: cd227de0 ESP: d4a59dfc
[54998.897102] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00210282
[54998.897104] CR0: 80050033 CR2: 00000000 CR3: 22de02e0 CR4: 000006f0

debian:~# uname -a
Linux debian 5.0.0-trunk-686-pae #1 SMP Debian 5.0.2-1~exp1 (2019-03-18) i686
GNU/Linux

The processor of the host is AMD Athlon(tm) II X2 245

This particular VM worked previously, but I will have to look into whether it
is the kernel or maybe qemu that broke it. However, a null pointer dereference
should still not happen IMHO.

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