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authorChristian Krinitsin <mail@krinitsin.com>2025-07-03 07:27:52 +0000
committerChristian Krinitsin <mail@krinitsin.com>2025-07-03 07:27:52 +0000
commitd0c85e36e4de67af628d54e9ab577cc3fad7796a (patch)
treef8f784b0f04343b90516a338d6df81df3a85dfa2 /results/classifier/gemma3:12b/kvm/1563152
parent7f4364274750eb8cb39a3e7493132fca1c01232e (diff)
downloademulator-bug-study-d0c85e36e4de67af628d54e9ab577cc3fad7796a.tar.gz
emulator-bug-study-d0c85e36e4de67af628d54e9ab577cc3fad7796a.zip
add deepseek and gemma results
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+
+general protection fault running VirtualBox in KVM guest
+
+I'm trying to run nested VMs using qemu-kvm on the physical host and VirtualBox on the guest host:
+  * physical host: Ubuntu 14.04 running Linux 4.2.0, qemu-kvm 2.0.0
+  * guest host: Ubuntu 16.04 beta 2 running Linux 4.2.0, VirtualBox 5.0.16
+
+When I try to start up a VirtualBox VM in the guest host, I get a general protection fault (see below for dmesg output).  According to https://www.virtualbox.org/ticket/14965 this is caused by a bug in QEMU/KVM:
+
+    The problem in more detail:  As written above, VirtualBox tries to
+    read the MSR 0x9B (IA32_SMM_MONITOR_CTL).  This is an
+    architectural MSR which is present if CPUID.01 / ECX bit 5 or bit
+    6 are set (VMX or SMX).  As KVM has nested virtualization enabled
+    and therefore pretends to support VT-x, this MSR must be
+    accessible and reading from this MSR must not raise a
+    #GP.  KVM/QEmu does not behave like real hardware in this case.
+
+dmesg output:
+
+SUPR0GipMap: fGetGipCpu=0x3
+general protection fault: 0000 [#1] SMP 
+Modules linked in: pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables ppdev kvm_intel kvm irqbypass snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep snd_pcm snd_timer i2c_piix4 snd input_leds soundcore joydev 8250_fintek mac_hid serio_raw pvpanic parport_pc parport ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul qxl ttm drm_kms_helper syscopyarea sysfillrect aesni_intel sysimgblt fb_sys_fops aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd psmouse floppy drm pata_acpi
+CPU: 0 PID: 31507 Comm: EMT Tainted: G           OE   4.4.0-15-generic #31-Ubuntu
+Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
+task: ffff880034c0a580 ti: ffff880002e00000 task.ti: ffff880002e00000
+RIP: 0010:[<ffffffffc067e506>]  [<ffffffffc067e506>] 0xffffffffc067e506
+RSP: 0018:ffff880002e03d70  EFLAGS: 00010206
+RAX: 00000000000006f0 RBX: 00000000ffffffdb RCX: 000000000000009b
+RDX: 0000000000000000 RSI: ffff880002e03d00 RDI: ffff880002e03cc8
+RBP: ffff880002e03d90 R08: 0000000000000004 R09: 00000000000006f0
+R10: 0000000049656e69 R11: 000000000f8bfbff R12: 0000000000000020
+R13: 0000000000000000 R14: ffffc9000057407c R15: ffffffffc0645260
+FS:  00007f89b8f6b700(0000) GS:ffff88007fc00000(0000) knlGS:0000000000000000
+CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
+CR2: 00007f89b8d10000 CR3: 0000000035ae1000 CR4: 00000000000006f0
+Stack:
+ 0000000000000000 ffffffff00000000 0000000000000000 0000000000000000
+ ffff880002e03db0 ffffffffc0693e93 ffffc90000574010 ffff880035aae550
+ ffff880002e03e30 ffffffffc060a3e7 ffff880002e03e10 0000000000000282
+Call Trace:
+ [<ffffffffc060a3e7>] ? supdrvIOCtl+0x2de7/0x3250 [vboxdrv]
+ [<ffffffffc06035b0>] ? VBoxDrvLinuxIOCtl_5_0_16+0x150/0x250 [vboxdrv]
+ [<ffffffff8121e7df>] ? do_vfs_ioctl+0x29f/0x490
+ [<ffffffff8106a554>] ? __do_page_fault+0x1b4/0x400
+ [<ffffffff8121ea49>] ? SyS_ioctl+0x79/0x90
+ [<ffffffff81821ff2>] ? entry_SYSCALL_64_fastpath+0x16/0x71
+Code: 88 e4 fc ff ff b9 3a 00 00 00 0f 32 48 c1 e2 20 89 c0 48 09 d0 48 89 05 f9 db 0e 00 0f 20 e0 b9 9b 00 00 00 48 89 05 d2 db 0e 00 <0f> 32 48 c1 e2 20 89 c0 b9 80 00 00 c0 48 09 d0 48 89 05 cb db 
+RIP  [<ffffffffc067e506>] 0xffffffffc067e506
+ RSP <ffff880002e03d70>
+---[ end trace b3284b6520f49e0d ]---
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