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From: "ysato at users dot sourceforge.jp" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/67349] New: ICE on optimization
Date: Tue, 25 Aug 2015 06:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67349

            Bug ID: 67349
           Summary: ICE on optimization
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ysato at users dot sourceforge.jp
  Target Milestone: ---

Created attachment 36252
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36252&action=edit
problem source

I got following error.

$ LANG=C h8300-unknown-linux-gcc -c -O2 -fconserve-stack sync.c
In file included from include/linux/rcupdate.h:429:0,
                 from include/linux/rcusync.h:5,
                 from kernel/rcu/sync.c:1:
include/linux/rcutiny.h: In function 'rcu_barrier_sched':
include/linux/rcutiny.h:55:91: internal compiler error: Segmentation fault
0xb11f6f crash_signal
        ../../gcc/toplev.c:352
0xc1fe56 tree_check
        ../../gcc/tree.h:2857
0xc1fe56 fold_builtin_alloca_with_align
        ../../gcc/tree-ssa-ccp.c:2110
0xc1fe56 ccp_fold_stmt
        ../../gcc/tree-ssa-ccp.c:2215
0xca6cba substitute_and_fold_dom_walker::before_dom_children(basic_block_def*)
        ../../gcc/tree-ssa-propagate.c:1226
0xe6a7f7 dom_walker::walk(basic_block_def*)
        ../../gcc/domwalk.c:177
0xca64a9 substitute_and_fold(tree_node* (*)(tree_node*), bool
(*)(gimple_stmt_iterator*), bool)
        ../../gcc/tree-ssa-propagate.c:1319
0xc17efc ccp_finalize
        ../../gcc/tree-ssa-ccp.c:951
0xc17efc do_ssa_ccp
        ../../gcc/tree-ssa-ccp.c:2410
0xc17efc execute
        ../../gcc/tree-ssa-ccp.c:2442
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.

without -fconserve-stack in no problem.