Re: 3 libstdc++ tests fail at random

[Jakub Jelinek <jakub at redhat dot com>]

On Sat, Dec 07, 2013 at 05:43:12PM +0100, Paolo Carlini wrote:
> On 12/07/2013 04:48 PM, H.J. Lu wrote:
> >I have been seeing 3 libstdc++ tests:
> >
> >FAIL: 17_intro/headers/c++200x/stdc+
> >+.cc (test for excess errors)
> >FAIL: 17_intro/headers/c++200x/stdc++_multiple_inclusion.cc (test for
> >excess errors)

These two failed for me just once so far, in i686-linux build,
the errors were the same for both, perhaps related to PR58627?
Just a random guess, but until that PR is fixed, if the compiler is using
ggc_freed memory, really anything can happen.

tree check: expected tree_list, have error_mark in dump_template_bindings, at cp/error.c:274                                                       
       _M_head(const _Head_base& __b) noexcept { return __b._M_head_impl; }                                                                        
       ^                                                                                                                                           
0x8bcc083 tree_check_failed(tree_node const*, char const*, int, char const*, ...)                                                                  
        ../../gcc/tree.c:9190                                                                                                                      
0x831d349 tree_check                                                                                                                               
        ../../gcc/tree.h:2702                                                                                                                      
0x831d349 dump_template_bindings                                                                                                                   
        ../../gcc/cp/error.c:274                                                                                                                   
0x831d349 dump_substitution                                                                                                                        
        ../../gcc/cp/error.c:1386                                                                                                                  
0x831e3fd dump_function_decl                                                                                                                       
        ../../gcc/cp/error.c:1515                                                                                                                  
0x8320c19 decl_to_string                                                                                                                           
        ../../gcc/cp/error.c:2829                                                                                                                  
0x8320c19 cp_printer                                                                                                                               
        ../../gcc/cp/error.c:3430                                                                                                                  
0x92c7c89 pp_format(pretty_printer*, text_info*)                                                                                                   
        ../../gcc/pretty-print.c:616                                                                                                               
0x92c840d pp_format_verbatim(pretty_printer*, text_info*)                                                                                          
        ../../gcc/pretty-print.c:675                                                                                                               
0x92c8471 pp_verbatim(pretty_printer*, char const*, ...)                                                                                           
        ../../gcc/pretty-print.c:871                                                                                                               
0x8311530 print_instantiation_full_context                                                                                                         
        ../../gcc/cp/error.c:3199                                                                                                                  
0x8311530 maybe_print_instantiation_context                                                                                                        
        ../../gcc/cp/error.c:3343                                                                                                                  
0x831f4eb cp_diagnostic_starter                                                                                                                    
        ../../gcc/cp/error.c:3027                                                                                                                  
0x92c5c0a diagnostic_report_diagnostic(diagnostic_context*, diagnostic_info*)                                                                      
        ../../gcc/diagnostic.c:791                                                                                                                 
0x92c63c9 internal_error(char const*, ...)                                                                                                         
        ../../gcc/diagnostic.c:1129                                                                                                                
0x8bcc083 tree_check_failed(tree_node const*, char const*, int, char const*, ...)                                                                  
        ../../gcc/tree.c:9190                                                                                                                      
0x840928a tree_check                                                                                                                               
        ../../gcc/tree.h:2702                                                                                                                      
0x840928a decl_is_template_id                                                                                                                      
        ../../gcc/cp/mangle.c:291                                                                                                                  
0x840dba6 write_nested_name                                                                                                                        
        ../../gcc/cp/mangle.c:949                                                                                                                  
0x840e320 write_name                                                                                                                               
        ../../gcc/cp/mangle.c:866                                                                                                                  

> >FAIL: 30_threads/async/async.cc execution test

async.exe: /usr/src/gcc/libstdc++-v3/testsuite/30_threads/async/async.cc:66: void test02(): Assertion `status == std::future_status::ready' failed.

This one fails pretty frequently for me, 6 times out of last 12 i686-linux
bootstraps/regtests, starting with ~ Nov 21th bootstrap (but before that
I did one only on Nov 15th, so there is a big window).  Neither of the above
ones were seen in x86_64 regtests (but, I'm not testing multilib, instead
doing two parallel full bootstraps and primary multilib regtests
(x86_64-linux and i686-linux)).

	Jakub