Hi All,
We found BPF sefltest fail to build with following error:
08-09 20:39:59 DBG: |output|: progs/test_global_func10.c:24:1: error: unknown type name '__failure' 08-09 20:39:59 DBG: |output|: __failure __msg("invalid indirect access to stack") 08-09 20:39:59 DBG: |output|: ^ 08-09 20:39:59 DBG: |output|: progs/test_global_func10.c:24:17: error: expected parameter declarator 08-09 20:39:59 DBG: |output|: __failure __msg("invalid indirect access to stack") 08-09 20:39:59 DBG: |output|: ^ 08-09 20:39:59 DBG: |output|: progs/test_global_func10.c:24:17: error: expected ')' 08-09 20:39:59 DBG: |output|: progs/test_global_func10.c:24:16: note: to match this '(' 08-09 20:39:59 DBG: |output|: __failure __msg("invalid indirect access to stack") 08-09 20:39:59 DBG: |output|: ^ 08-09 20:39:59 DBG: |output|: progs/test_global_func10.c:24:52: error: expected ';' after top level declarator 08-09 20:39:59 DBG: |output|: __failure __msg("invalid indirect access to stack") 08-09 20:39:59 DBG: |output|: ^ 08-09 20:39:59 DBG: |output|: ; 08-09 20:39:59 DBG: |output|: 4 errors generated. 08-09 20:39:59 DBG: |output|: make: *** [Makefile:470: /root/oltf/work/linux-bpf-qa/tools/testing/selftests/bpf/test_global_func10.o] Error 1 08-09 20:39:59 DBG: |output|: make: *** Waiting for unfinished jobs....
It happens from the commit e30bc19a9ee8("bpf: Allow reads from uninit stack"). We did a further look, '__failure' is defined in tools/testing/selftests/bpf/progs/bpf_misc.h, and was 1st introduced in commit 537c3f66eac1("selftests/bpf: add generic BPF program tester-loader") which is not backported to linux-5.15.y.
So we may need to revert the patch, or fix it.
Kind regards, Sherry