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...spect a small bug in /kernel/net/ipv4/netfilter/ip_tables.c __do_replace() function. xt_replace_table() may return NULL when allocation of memory was not successful by xt_replace_table->xt_jumpstack_alloc() (in my case I suspect there were no free memory when it's happened): ... oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); if (!oldinfo) goto put_module; The full bactrace is WARNING: at /kernel/mm/vmalloc.c:107 vmap_page_range_noflush+0x120/0x1b4() <4>[18835.587677] [<c00409dc>] (unwind_backtrace+0x0/0x164) from [<c0082a34>] (warn_...