David and Michael, can you please build a kernel with attached patch and options KDB, and report what's the trace is.
Unfortunately my iwn(4) is running on amd64, so I can reproduce exactly your case. -- Totus tuus, Glebius.
Index: i386/i386/in_cksum.c =================================================================== --- i386/i386/in_cksum.c (revision 241328) +++ i386/i386/in_cksum.c (working copy) @@ -36,6 +36,7 @@ #include <sys/param.h> #include <sys/systm.h> #include <sys/mbuf.h> +#include <sys/kdb.h> #include <netinet/in.h> #include <netinet/in_systm.h> @@ -204,6 +205,7 @@ caddr_t addr; union q_util q_util; union l_util l_util; + static int once = 0; len -= skip; for (; skip && m; m = m->m_next) { @@ -477,8 +479,12 @@ su.c[0] = *(char *)w; } - if (len) + if (len) { printf("%s: out of data by %d\n", __func__, len); + if (once == 0) + kdb_backtrace(); + once = 1; + } if (mlen == -1) { /* The last mbuf has odd # of bytes. Follow the standard (the odd byte is shifted left by 8 bits) */
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