tree: https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git bpf/attach head: 309b598ba309017a35c6659304b00395d39c0ecb commit: 74674c0d67be89d274546c46f8715315099c2b9d [13/18] bpf: Add BPF_TRAMPOLINE_BATCH_ATTACH support config: x86_64-randconfig-p001-20201018 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/commit/?id... git remote add jolsa-perf https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git git fetch --no-tags jolsa-perf bpf/attach git checkout 74674c0d67be89d274546c46f8715315099c2b9d # 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(a)intel.com&gt; All error/warnings (new ones prefixed by >>): kernel/bpf/syscall.c: In function 'bpf_trampoline_batch': 2919 | batch = bpf_trampoline_batch_alloc(count); | ^~~~~~~~~~~~~~~~~~~~~~~~~~ | bpf_trampoline_batch 2919 | batch = bpf_trampoline_batch_alloc(count); | ^ 2946 | ret = register_ftrace_direct_ips(batch->ips, batch->addrs, batch->idx); | ^~~~~~~~~~~~~~~~~~~~~~~~~~ | register_ftrace_direct 2951 | bpf_trampoline_batch_free(batch); | ^~~~~~~~~~~~~~~~~~~~~~~~~ | bpf_trampoline_batch cc1: some warnings being treated as errors vim +2919 kernel/bpf/syscall.c 2884 2885 static int bpf_trampoline_batch(const union bpf_attr *attr, int cmd) 2886 { 2887 void __user *uout = u64_to_user_ptr(attr->trampoline_batch.out); 2888 void __user *uin = u64_to_user_ptr(attr->trampoline_batch.in); 2889 struct bpf_trampoline_batch *batch = NULL; 2890 struct bpf_prog *prog; 2891 int count, ret, i, fd; 2892 u32 *in, *out; 2893 2894 if (CHECK_ATTR(BPF_RAW_TRACEPOINT_OPEN_BATCH)) 2895 return -EINVAL; 2896 2897 if (!uin || !uout) 2898 return -EINVAL; 2899 2900 count = attr->trampoline_batch.count; 2901 2902 in = kcalloc(count, sizeof(u32), GFP_KERNEL); 2903 out = kcalloc(count, sizeof(u32), GFP_KERNEL); 2904 if (!in || !out) { 2905 kfree(in); 2906 kfree(out); 2907 return -ENOMEM; 2908 } 2909 2910 ret = copy_from_user(in, uin, count * sizeof(u32)); 2911 if (ret) 2912 goto out_clean; 2913 2914 /* test read out array */ 2915 ret = copy_to_user(uout, out, count * sizeof(u32)); 2916 if (ret) 2917 goto out_clean; 2918 2920 if (!batch) 2921 goto out_clean; 2922 2923 for (i = 0; i < count; i++) { 2924 if (cmd == BPF_TRAMPOLINE_BATCH_ATTACH) { 2925 prog = bpf_prog_get(in[i]); 2926 if (IS_ERR(prog)) { 2927 ret = PTR_ERR(prog); 2928 goto out_clean; 2929 } 2930 2931 ret = -EINVAL; 2932 if (prog->type != BPF_PROG_TYPE_TRACING) 2933 goto out_clean; 2934 if (prog->type == BPF_PROG_TYPE_TRACING && 2935 prog->expected_attach_type == BPF_TRACE_RAW_TP) 2936 goto out_clean; 2937 2938 fd = bpf_tracing_prog_attach(prog, 0, 0, batch); 2939 if (fd < 0) 2940 goto out_clean; 2941 2942 out[i] = fd; 2943 } 2944 } 2945 2947 if (!ret) 2948 WARN_ON_ONCE(copy_to_user(uout, out, count * sizeof(u32))); 2949 2950 out_clean: 2952 kfree(in); 2953 kfree(out); 2954 return ret; 2955 } 2956 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org