linux-kernel - Re: [PATCH] kprobes: stacktrace: Recover the address changed by kretprobe

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Date:   Thu, 4 Mar 2021 23:22:19 +0800
From:   kernel test robot <lkp@...el.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Cc:     Daniel Xu <dxu@...uu.xyz>, linux-kernel@...r.kernel.org,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>, kuba@...nel.org
Subject: Re: [PATCH] kprobes: stacktrace: Recover the address changed by
 kretprobe

Hi Masami,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.12-rc1 next-20210304]
[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]

url:    https://github.com/0day-ci/linux/commits/Masami-Hiramatsu/kprobes-stacktrace-Recover-the-address-changed-by-kretprobe/20210304-212528
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git f69d02e37a85645aa90d18cacfff36dba370f797
config: x86_64-randconfig-m001-20210304 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/2204ff150821a6a3c13b4fa10784b5efb3e3adc8
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Masami-Hiramatsu/kprobes-stacktrace-Recover-the-address-changed-by-kretprobe/20210304-212528
        git checkout 2204ff150821a6a3c13b4fa10784b5efb3e3adc8
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   kernel/stacktrace.c: In function 'stack_trace_consume_entry':
>> kernel/stacktrace.c:97:9: error: implicit declaration of function 'kretprobe_real_stack_tsk' [-Werror=implicit-function-declaration]
      97 |  addr = kretprobe_real_stack_tsk(c->tsk, addr, &c->cur);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~
>> kernel/stacktrace.c:97:35: error: 'struct stacktrace_cookie' has no member named 'tsk'
      97 |  addr = kretprobe_real_stack_tsk(c->tsk, addr, &c->cur);
         |                                   ^~
>> kernel/stacktrace.c:97:50: error: 'struct stacktrace_cookie' has no member named 'cur'
      97 |  addr = kretprobe_real_stack_tsk(c->tsk, addr, &c->cur);
         |                                                  ^~
   cc1: some warnings being treated as errors


vim +/kretprobe_real_stack_tsk +97 kernel/stacktrace.c

    85	
    86	static bool stack_trace_consume_entry(void *cookie, unsigned long addr)
    87	{
    88		struct stacktrace_cookie *c = cookie;
    89	
    90		if (c->len >= c->size)
    91			return false;
    92	
    93		if (c->skip > 0) {
    94			c->skip--;
    95			return true;
    96		}
  > 97		addr = kretprobe_real_stack_tsk(c->tsk, addr, &c->cur);
    98		c->store[c->len++] = addr;
    99		return c->len < c->size;
   100	}
   101	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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