Subject: Re: [PATCH v5] bpf: test_run: Fix the null pointer dereference issue in bpf_lwt_xmit_push_encap

From: kernel test robot <[email-masked]>
Date: Wed, 11 Feb 2026 03:08:56 +0800

Hi Feng,

kernel test robot noticed the following build errors:

[auto build test ERROR on bpf-next/net]
[also build test ERROR on bpf-next/master bpf/master net-next/main net/main linus/master v6.19 next-20260209]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Feng-Yang/bpf-test_run-Fix-the-null-pointer-dereference-issue-in-bpf_lwt_xmit_push_encap/20260210-171138
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git net
patch link:    https://lore.kernel.org/r/20260210090657.86977-1-yangfeng59949%40163.com
patch subject: [PATCH v5] bpf: test_run: Fix the null pointer dereference issue in bpf_lwt_xmit_push_encap
config: sparc-randconfig-002-20260210 (https://download.01.org/0day-ci/archive/20260211/[email-masked]/config)
compiler: sparc64-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260211/[email-masked]/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <[email-masked]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email-masked]/

All errors (new ones prefixed by >>):

   sparc64-linux-ld: net/bpf/test_run.o: in function `bpf_prog_test_run_skb':
>> test_run.c:(.text+0x46fc): undefined reference to `ip_route_output_flow'

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