[Bug 264257] [panic] Fatal trap 12: page fault while in kernel mode (if_io_tqg_4)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264257

--- Comment #1 from iron.udjin@gmail.com ---
(kgdb) list *0xffffffff80cae31d
0xffffffff80cae31d is in m_copydata (/usr/src/sys/kern/uipc_mbuf.c:659).
654                     off -= m->m_len;
655                     m = m->m_next;
656             }
657             while (len > 0) {
658                     KASSERT(m != NULL, ("m_copydata, length > size of mbuf
chain"));
659                     count = min(m->m_len - off, len);
660                     if ((m->m_flags & M_EXTPG) != 0)
661                             m_copyfromunmapped(m, off, count, cp);
662                     else
663                             bcopy(mtod(m, caddr_t) + off, cp, count);

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