Here's a patch that fixes the problem. I have only tested it on my
target (arm926ejs), so tests on other architectures would be
worthwhile. Hope this helps, and let me know if I can do anything
else.
-- Tyler
diff --git a/agent/mibgroup/ip-mib/data_access/defaultrouter_linux.c
b/agent/mibgroup/ip-mib/data_access/defaultrouter_linux.c
index 702128b..4cb5dd9 100644
--- a/agent/mibgroup/ip-mib/data_access/defaultrouter_linux.c
+++ b/agent/mibgroup/ip-mib/data_access/defaultrouter_linux.c
@@ -11,7 +11,7 @@
#include "ip-mib/ipDefaultRouterTable/ipDefaultRouterTable.h"
-#include <asm/types.h>
+#include <stdint.h>
#ifdef HAVE_LINUX_RTNETLINK_H
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
@@ -93,9 +93,18 @@ _load(netsnmp_container *container)
netsnmp_defaultrouter_entry *entry;
int nlsk;
struct sockaddr_nl addr;
- unsigned char rcvbuf[RCVBUF_SIZE];
int rcvbuf_size = RCVBUF_SIZE;
- unsigned char sndbuf[SNDBUF_SIZE];
+
+ /* Buffers must be memory aligned. Message structure internal alignment is
+ * maintained by the netlink API. */
+ unsigned char rcvbufmem[RCVBUF_SIZE + sizeof(intmax_t)];
+ unsigned char *rcvbuf = rcvbufmem +
+ sizeof(intmax_t) - (((intptr_t)rcvbufmem) % sizeof(intmax_t));
+
+ unsigned char sndbufmem[SNDBUF_SIZE + sizeof(intmax_t)];
+ unsigned char *sndbuf = sndbufmem +
+ sizeof(intmax_t) - (((intptr_t)sndbufmem) % sizeof(intmax_t));
+
struct nlmsghdr *hdr;
struct rtmsg *rthdr;
int count;
On Mon, Jun 11, 2012 at 8:46 PM, Magnus Fromreide <ma...@lysator.liu.se> wrote:
> On Mon, 2012-06-11 at 16:32 -0700, Tyler Olmstead wrote:
>> Hi all,
>>
>> I have cross-compiled net-snmp 5.7.1 for a custom port of Linux 2.6.37
>> on an armv5tejl core (AM1808). I have encountered some alignment traps
>> in syslog after MIB-walking.
>>
>> According to objdump, most of the traps seem to be triggered by an
>> unaligned access to stack memory in defaultrouter_linux.c:static int
>> _load(netsnmp_container *container). Has anyone else encountered this?
>> Is this a known issue or should I submit a patch?
>
> I have not heard of this before so a patch or enough information to let
> us debug this would be highly appreciated.
>
> /MF
>
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