[Xen-devel] help with horrible network failures

[Rob Gardner <rob.gardner@xxxxxx>]

I've got two machines running identical versions of xen & linux. One of 
them constantly has problems under high network loads (70-100% httperf 
loads). This is using xen-unstable checked out on or about Feb 13. Any 
clues? See below for details.
Rob


KERNEL: assertion (flags & MSG_PEEK) failed at net/ipv4/tcp.c (1284)
(this messager sometimes repeated dozens of times...)
Followed by:
Unable to handle kernel paging request at virtual address a02e19e0
 printing eip:
c0115fad
*pde = ma 00000000 pa 55555000
 [<c0116b21>] __wake_up_common+0x41/0x60
 [<c0116b8c>] __wake_up+0x4c/0xb0
 [<c023d2d9>] sock_def_wakeup+0x49/0x50
 [<c026a9d9>] tcp_rcv_state_process+0x749/0x970
 [<c02723d6>] tcp_v4_do_rcv+0xa6/0x130
 [<c0272a18>] tcp_v4_rcv+0x5b8/0x850
 [<c02158b7>] add_timer_randomness+0x107/0x130
 [<c025740b>] ip_local_deliver+0xab/0x160
 [<c02577ea>] ip_rcv+0x32a/0x460
 [<c0210bf0>] memmove+0x50/0x60
 [<c0244553>] netif_receive_skb+0x133/0x1c0
 [<c0238601>] netif_poll+0x301/0x660
 [<c023de84>] kfree_skbmem+0x24/0x30
 [<c0244815>] net_rx_action+0xb5/0x1a0
 [<c011f545>] __do_softirq+0xc5/0xf0
 [<c011f5fa>] do_softirq+0x8a/0x90
 [<c0136355>] irq_exit+0x35/0x40
 [<c010e262>] do_IRQ+0x22/0x30
 [<c0106048>] evtchn_do_upcall+0xa8/0x110
 [<c0109dc7>] hypervisor_callback+0x37/0x40
Oops: 0000 [#1]
PREEMPT
Modules linked in:
CPU:    0
EIP:    0061:[<c0115fad>]    Not tainted VLI
EFLAGS: 00010202   (2.6.10-xenU)
EIP is at try_to_wake_up+0x1d/0xf0
eax: c033d860   ebx: a02e19e0   ecx: 00000001   edx: c2403d88
esi: c527dc98   edi: 00000000   ebp: c2403d98   esp: c2403d7c
ds: 007b   es: 007b   ss: 0069
Process httpd (pid: 7900, threadinfo=c2402000 task=c41c7a60)
Stack: a02e19e0 c2403d88 00000004 00000001 00000000 c527dc98 00000000 
c2403dbc
       c0116b21 a02e19e0 00000001 00000000 00000000 00000000 00000000 
c2402000
       c2403de8 c0116b8c c527dc98 00000001 00000000 00000000 00000000 
00000000
Call Trace:
 [<c0116b21>] __wake_up_common+0x41/0x60
 [<c0116b8c>] __wake_up+0x4c/0xb0
 [<c023d2d9>] sock_def_wakeup+0x49/0x50
 [<c026a9d9>] tcp_rcv_state_process+0x749/0x970
 [<c02723d6>] tcp_v4_do_rcv+0xa6/0x130
 [<c0272a18>] tcp_v4_rcv+0x5b8/0x850
 [<c02158b7>] add_timer_randomness+0x107/0x130
 [<c025740b>] ip_local_deliver+0xab/0x160
 [<c02577ea>] ip_rcv+0x32a/0x460
 [<c0210bf0>] memmove+0x50/0x60
 [<c0244553>] netif_receive_skb+0x133/0x1c0
 [<c0238601>] netif_poll+0x301/0x660
 [<c023de84>] kfree_skbmem+0x24/0x30
 [<c0244815>] net_rx_action+0xb5/0x1a0
 [<c011f545>] __do_softirq+0xc5/0xf0
 [<c011f5fa>] do_softirq+0x8a/0x90
 [<c0136355>] irq_exit+0x35/0x40
 [<c010e262>] do_IRQ+0x22/0x30
 [<c0106048>] evtchn_do_upcall+0xa8/0x110
 [<c0109dc7>] hypervisor_callback+0x37/0x40
Code: 28 00 00 00 00 8b 5d fc 89 ec 5d c3 89 f6 55 89 e5 57 8d 45 f0 31 
ff 56 53
 83 ec 1   0 8b 5d 08 89 44 24 04 89 1c 24 e8 33 fc ff ff <8b> 13 89 c6 
8b 45 0c
 85 d0 74 4d 8b 43    28 85 c0 75 40 83 fa 02
 <0>Kernel panic - not syncing: Fatal exception in interrupt




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