I had a host running kvm-27 oops on me last week. The system had been
up for about 2 weeks, and had probably run and stopped at least a couple
hundred kvm guests. I don't think it is very reproducible, but here it
is anyway. The host is running 2.6.20.4.
Here's the actual BUG_ON() that was hit:
static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc,
size_t size)
{
void *p;
BUG_ON(!mc-nobjs);
p = mc-objects[--mc-nobjs];
memset(p, 0, size);
return p;
}
There were several oopses in there, but I think probably on the first
one is of any real interest.
Jun 29 06:40:45 elm3b173 kernel: [982460.818197] [ cut here
]
Jun 29 06:40:45 elm3b173 kernel: [982460.827716] kernel BUG at
/home/dave/kvm-27/kernel/mmu.c:276!
Jun 29 06:40:45 elm3b173 kernel: [982460.841230] invalid opcode: [1] SMP
Jun 29 06:40:45 elm3b173 kernel: [982460.849587] CPU 0
Jun 29 06:40:45 elm3b173 kernel: [982460.853928] Modules linked in: kvm_intel
kvm aic94xx
Jun 29 06:40:45 elm3b173 kernel: [982460.864257] Pid: 11430, comm:
qemu-system-x86 Not tainted 2.6.20.4 #6
Jun 29 06:40:45 elm3b173 kernel: [982460.877419] RIP:
0010:[_end+124740199/2127394328] [_end+124740199/2127394328]
:kvm:mmu_memory_cache_alloc+0xf/0x40
Jun 29 06:40:45 elm3b173 kernel: [982460.896268] RSP: 0018:810129485548
EFLAGS: 00010246
Jun 29 06:40:45 elm3b173 kernel: [982460.907199] RAX: RBX:
8101d49cf820 RCX: 0002
Jun 29 06:40:45 elm3b173 kernel: [982460.921831] RDX: RSI:
0050 RDI: 8101f9ad24e8
Jun 29 06:40:45 elm3b173 kernel: [982460.936469] RBP: 810129485558 R08:
R09:
Jun 29 06:40:45 elm3b173 kernel: [982460.951101] R10: 8100504f4000 R11:
1000 R12: 8101f9ad2128
Jun 29 06:40:45 elm3b173 kernel: [982460.965739] R13: R14:
8101f9ad1990 R15: 8101f9ad2128
Jun 29 06:40:45 elm3b173 kernel: [982460.980375] FS: 2ba55b51fa00()
GS:807d4000() knlGS:
Jun 29 06:40:45 elm3b173 kernel: [982460.996918] CS: 0010 DS: 002b ES: 002b
CR0: 80050033
Jun 29 06:40:45 elm3b173 kernel: [982461.008690] CR2: b7f3e884 CR3:
0001d37b CR4: 26e0
Jun 29 06:40:45 elm3b173 kernel: [982461.023339] Process qemu-system-x86 (pid:
11430, threadinfo 810129484000, task 8102172900c0)
Jun 29 06:40:45 elm3b173 kernel: [982461.041972] Stack: 810088fd31e0
8101d49cf820 810129485588 8801f1d8
Jun 29 06:40:45 elm3b173 kernel: [982461.058500] 81019896fefc
8101d49cf820 0322 270d
Jun 29 06:40:45 elm3b173 kernel: [982461.073776] 8101294855c8
8801f5ea 8101f9ad2128
Jun 29 06:40:45 elm3b173 kernel: [982461.088592] Call Trace:
Jun 29 06:40:45 elm3b173 kernel: [982461.094248] [_end+124741616/2127394328]
:kvm:kvm_mmu_alloc_page+0x38/0x110
Jun 29 06:40:45 elm3b173 kernel: [982461.107243] [_end+124742658/2127394328]
:kvm:kvm_mmu_get_page+0xda/0x150
Jun 29 06:40:45 elm3b173 kernel: [982461.119888] [_end+124744897/2127394328]
:kvm:mmu_alloc_roots+0xf9/0x190
Jun 29 06:40:45 elm3b173 kernel: [982461.132360] [_end+124745400/2127394328]
:kvm:paging_new_cr3+0x30/0x60
Jun 29 06:40:45 elm3b173 kernel: [982461.144467] [_end+124724233/2127394328]
:kvm:set_cr3+0xb1/0xd0
Jun 29 06:40:45 elm3b173 kernel: [982461.155369] [_end+124818018/2127394328]
:kvm_intel:handle_cr+0xba/0x1d0
Jun 29 06:40:45 elm3b173 kernel: [982461.167839] [_end+124819078/2127394328]
:kvm_intel:kvm_handle_exit+0x7e/0xb0
Jun 29 06:40:45 elm3b173 kernel: [982461.181163] [_end+124819740/2127394328]
:kvm_intel:vmx_vcpu_run+0x224/0x2d0
Jun 29 06:40:45 elm3b173 kernel: [982461.194314] [_end+124732211/2127394328]
:kvm:kvm_vcpu_ioctl_run+0xfb/0x140
Jun 29 06:40:45 elm3b173 kernel: [982461.207305] [_end+124736555/2127394328]
:kvm:kvm_vcpu_ioctl+0x113/0x420
Jun 29 06:40:45 elm3b173 kernel: [982461.219779] [__alloc_pages+100/768]
__alloc_pages+0x64/0x300
Jun 29 06:40:45 elm3b173 kernel: [982461.231031] [find_busiest_group+673/1856]
find_busiest_group+0x2a1/0x740
Jun 29 06:40:45 elm3b173 kernel: [982461.243319]
[find_next_zero_string+39/128] find_next_zero_string+0x27/0x80
Jun 29 06:40:45 elm3b173 kernel: [982461.255772] [iommu_range_alloc+40/208]
iommu_range_alloc+0x28/0xd0
Jun 29 06:40:45 elm3b173 kernel: [982461.267531] [iommu_alloc+134/208]
iommu_alloc+0x86/0xd0
Jun 29 06:40:45 elm3b173 kernel: [982461.278256] [calgary_map_single+75/128]
calgary_map_single+0x4b/0x80
Jun 29 06:40:45 elm3b173 kernel: [982461.290199]
[tg3_start_xmit_dma_bug+1215/1344] tg3_start_xmit_dma_bug+0x4bf/0x540
Jun 29 06:40:45 elm3b173 kernel: [982461.303175] [dev_hard_start_xmit+131/256]
dev_hard_start_xmit+0x83/0x100
Jun 29 06:40:45 elm3b173 kernel: [982461.315457] [__qdisc_run+83/480]
__qdisc_run+0x53/0x1e0
Jun 29
