[Xen-devel] [PATCH] xen: netback: increase size of rx_meta array.

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

We can end up needing as many of these as we need grant copy operations so
increase the array size for the same reason.

Crash observed on XenServer:
kernel: ------------[ cut here ]------------
kernel: kernel BUG at drivers/xen/netback/netback.c:834!
kernel: invalid opcode: 0000 [#1] SMP
kernel: last sysfs file: /sys/devices/xen-backend/vbd-10-768/statistics/rd_usecs
kernel: Process netback (pid: 1413, ti=ec8a4000 task=ed0a6b70 task.ti=ec8a4000)
kernel: Stack: 00000000 00000612 00000001 00000000 00020000 00000000 ecfbe000 
00000000
kernel:        ec8a5f80 ec8a5f98 ec8a5fac 00000000 c0537220 c0539220 00000000 
c0534220
kernel:        cd7afaa0 cd7afaa0 0000000c 00000014 062de396 00000001 00000001 
00000014
kernel: Call Trace:
kernel:  [<c0285f10>] ? netbk_action_thread+0x0/0x1fe0
kernel:  [<c013daf2>] ? kthread+0x42/0x70
kernel:  [<c013dab0>] ? kthread+0x0/0x70
kernel:  [<c010569b>] ? kernel_thread_helper+0x7/0x10
kernel:  =======================
kernel: Code: 00 00 c7 42 08 20 82 53 c0 8b 85 e4 fe ff ff c7 42 10 00 00 00 00 
\
              c7 42 14 f0 7f 00 00 89 42 0c 8b 8d ec fe ff ff e9 3e e9 ff ff 
<0f> \
              0b eb fe 0f 0b eb fe 0f 0b eb fe 0f 0b eb fe 31 c0 e8 bf 31
kernel: EIP: [<c028790a>] netbk_action_thread+0x19fa/0x1fe0 SS:ESP 0069:ec8a5d98

Corresponding to
        BUG_ON(npo.meta_prod > ARRAY_SIZE(netbk->meta));

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 drivers/xen/netback/common.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/xen/netback/common.h b/drivers/xen/netback/common.h
index b40ad72..feacf5f 100644
--- a/drivers/xen/netback/common.h
+++ b/drivers/xen/netback/common.h
@@ -320,7 +320,7 @@ struct xen_netbk {
        struct gnttab_copy grant_copy_op[2*NET_RX_RING_SIZE];
        unsigned char rx_notify[NR_IRQS];
        u16 notify_list[NET_RX_RING_SIZE];
-       struct netbk_rx_meta meta[NET_RX_RING_SIZE];
+       struct netbk_rx_meta meta[2*NET_RX_RING_SIZE];
 };
 
 extern struct xen_netbk *xen_netbk;
-- 
1.5.6.5


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel