Re: Linux x86 guest panics in skb_copy_bits

Justin Dossey
2009-05-11T17:57:44Z

On Wed, May 6, 2009 at 5:16 PM, Marcelo Tosatti <mtosatti@redhat.com> wrote:
> Justin,
[snip]
> OK, so you're original report contains a different bug. You can disable
> CONFIG_KVM_GUEST in the meantime as a workaround, until the bug is
> fixed.
>

Disabling CONFIG_KVM_GUEST gives me a new panic. I'm going to try
disabling SMP.

[ 71.470022] ------------[ cut here ]------------
[ 71.470022] WARNING: at kernel/smp.c:333 smp_call_function_mask+0x33/0x185()
[ 71.470022] Modules linked in:
[ 71.470022] Pid: 4618, comm: ruby18 Tainted: G D 2.6.28-gentoo-r4 #3
[ 71.470022] Call Trace:
[ 71.470022] [<c022735a>] warn_on_slowpath+0x41/0x5b
[ 71.470022] [<c03ada5e>] ? __delay+0x9/0xb
[ 71.470022] [<c0405af6>] ? serial8250_console_write+0xd6/0xea
[ 71.470022] [<c03b12f7>] ? _raw_spin_unlock+0x8e/0x92
[ 71.470022] [<c0586f9c>] ? _spin_unlock+0x1d/0x20
[ 71.470022] [<c03b1457>] ? _raw_spin_lock+0x60/0xf5
[ 71.470022] [<c023af8e>] ? up+0x2b/0x2f
[ 71.470022] [<c03b12f7>] ? _raw_spin_unlock+0x8e/0x92
[ 71.470022] [<c022797f>] ? release_console_sem+0x185/0x198
[ 71.470022] [<c03b12f7>] ? _raw_spin_unlock+0x8e/0x92
[ 71.470022] [<c022798a>] ? release_console_sem+0x190/0x198
[ 71.470022] [<c0246630>] smp_call_function_mask+0x33/0x185
[ 71.470022] [<c02100e4>] ? stop_this_cpu+0x0/0x50
[ 71.470022] [<c0585ca3>] ? mutex_unlock+0x8/0xa
[ 71.470022] [<c0585ca3>] ? mutex_unlock+0x8/0xa
[ 71.470022] [<c024f4cd>] ? crash_kexec+0x9f/0xa7
[ 71.470022] [<c0585ca3>] ? mutex_unlock+0x8/0xa
[ 71.470022] [<c024f4cd>] ? crash_kexec+0x9f/0xa7
[ 71.470022] [<c0246794>] smp_call_function+0x12/0x14
[ 71.470022] [<c0210183>] native_smp_send_stop+0x1b/0x45
[ 71.470022] [<c02273d0>] panic+0x4e/0xef
[ 71.470022] [<c0587e2e>] oops_end+0x8f/0xa3
[ 71.470022] [<c0205c87>] die+0x57/0x5f
[ 71.470022] [<c0589477>] do_page_fault+0x63e/0x6fa
[ 71.470022] [<c0268c84>] ? __alloc_pages_internal+0xad/0x33a
[ 71.470022] [<c0588e39>] ? do_page_fault+0x0/0x6fa
[ 71.470022] [<c05874fa>] error_code+0x72/0x78
[ 71.470022] [<c02856a9>] ? __slab_alloc+0x217/0x42f
[ 71.470022] [<c02867a5>] __kmalloc_track_caller+0x89/0xda
[ 71.470022] [<c04b6782>] ? __netdev_alloc_skb+0x17/0x34
[ 71.470022] [<c04b6782>] ? __netdev_alloc_skb+0x17/0x34
[ 71.470022] [<c04b5948>] __alloc_skb+0x4f/0xfb
[ 71.470022] [<c04b6782>] __netdev_alloc_skb+0x17/0x34
[ 71.470022] [<c0452583>] try_fill_recv+0x30/0x177
[ 71.470022] [<c0221a45>] ? try_to_wake_up+0x200/0x20b
[ 71.470022] [<c0453237>] virtnet_poll+0x25c/0x309
[ 71.470022] [<c04bc32e>] net_rx_action+0xbd/0x1ea
[ 71.470022] [<c022b2ed>] __do_softirq+0x83/0x12e
[ 71.470022] [<c022b3e0>] do_softirq+0x48/0x57
[ 71.470022] [<c022b6fa>] irq_exit+0x38/0x6d
[ 71.470022] [<c0205868>] do_IRQ+0x96/0xae
[ 71.470022] [<c020471b>] common_interrupt+0x23/0x28
[ 71.470022] [<c03b00d8>] ? sg_miter_start+0x14/0x3b
[ 71.470022] [<c02681a1>] ? free_hot_cold_page+0x12f/0x1ef
[ 71.470022] [<c0268298>] free_hot_page+0xa/0xc
[ 71.470022] [<c026b6ef>] put_page+0xd2/0xd7
[ 71.470022] [<c027bd56>] free_page_and_swap_cache+0x32/0x38
[ 71.470022] [<c0271dfc>] unmap_vmas+0x3fd/0x698
[ 71.470022] [<c03b1457>] ? _raw_spin_lock+0x60/0xf5
[ 71.470022] [<c02758f4>] unmap_region+0x8e/0xf5
[ 71.470022] [<c02762ad>] do_munmap+0x188/0x1de
[ 71.470022] [<c02771b5>] sys_munmap+0x30/0x3f
[ 71.470022] [<c0203bd2>] syscall_call+0x7/0xb
[ 71.470022] ---[ end trace 7e1609da76631ce2 ]---