Created attachment 1076284 [details] C source code Description of problem: $ alpha-linux-gnu-gcc -c -O3 bug231.c In file included from include/linux/thread_info.h:54:0, from include/asm-generic/preempt.h:4, from arch/alpha/include/generated/asm/preempt.h:1, from include/linux/preempt.h:64, from include/linux/spinlock.h:50, from kernel/rcu/update.c:36: ./arch/alpha/include/asm/thread_info.h:45:30: warning: call-clobbered register used for global register variable kernel/rcu/update.c: In function ‘synchronize_rcu_tasks’: kernel/rcu/update.c:589:6: internal compiler error: Segmentation fault Please submit a full bug report, with preprocessed source if appropriate. See <http://bugzilla.redhat.com/bugzilla/> for instructions. Preprocessed source stored into /tmp/ccA4zHPI.out file, please attach this to your bugreport. [dcb@dhcppc0 foundBugs]$ alpha-linux-gnu-gcc -c -O2 bug231.c In file included from include/linux/thread_info.h:54:0, from include/asm-generic/preempt.h:4, from arch/alpha/include/generated/asm/preempt.h:1, from include/linux/preempt.h:64, from include/linux/spinlock.h:50, from kernel/rcu/update.c:36: ./arch/alpha/include/asm/thread_info.h:45:30: warning: call-clobbered register used for global register variable [dcb@dhcppc0 foundBugs]$ Version-Release number of selected component (if applicable): How reproducible: Steps to Reproduce: 1. 2. 3. Actual results: Expected results: Additional info:
gdb stack backtrace gives us (gdb) bt #0 0x0000000000965a6f in ?? () #1 0x00000000009cc699 in substitute_and_fold_dom_walker::before_dom_children(basic_block_def*) () #2 0x0000000000b4b4d2 in dom_walker::walk(basic_block_def*) () #3 0x00000000009cc0ba in substitute_and_fold(tree_node* (*)(tree_node*), bool (*)(gimple_stmt_iterator*), bool) () #4 0x000000000095cb99 in ?? () #5 0x000000000080a0fa in execute_one_pass(opt_pass*) () #6 0x000000000080a516 in ?? () #7 0x000000000080a528 in ?? () #8 0x000000000080a569 in execute_pass_list(function*, opt_pass*) () #9 0x00000000005cf7c8 in cgraph_node::expand() () #10 0x00000000005d0b14 in ?? () #11 0x00000000005d1fd0 in symbol_table::finalize_compilation_unit() () #12 0x00000000004e892b in c_write_global_declarations() () #13 0x00000000008a7606 in ?? () #14 0x00000000004d272b in toplev::main(int, char**) () #15 0x00000000004d341a in main ()
Created attachment 1097192 [details] Reduced test case Highly reduced test case. Compile with: alpha-linux-gnu-gcc -c -O3 /tmp/bz1265791-testcase.c Produces: /tmp/bz1265791-testcase.c: In function ‘synchronize_rcu_tasks’: /tmp/bz1265791-testcase.c:8:6: internal compiler error: Segmentation fault void synchronize_rcu_tasks(void) ^ Please submit a full bug report, with preprocessed source if appropriate. See <http://bugzilla.redhat.com/bugzilla/> for instructions. Preprocessed source stored into /tmp/ccBZfX0I.out file, please attach this to your bugreport.
cross-gcc-5.2.1-4.fc22 has been submitted as an update to Fedora 22. https://bodhi.fedoraproject.org/updates/FEDORA-2015-baa411f109
cross-gcc-5.2.1-4.fc23 has been submitted as an update to Fedora 23. https://bodhi.fedoraproject.org/updates/FEDORA-2015-800f81b3f6
cross-gcc-5.2.1-4.fc23 has been pushed to the Fedora 23 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with $ su -c 'dnf --enablerepo=updates-testing update cross-gcc' You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2015-800f81b3f6
cross-gcc-5.2.1-4.fc22 has been pushed to the Fedora 22 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with $ su -c 'dnf --enablerepo=updates-testing update cross-gcc' You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2015-baa411f109
cross-gcc-5.2.1-4.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
cross-gcc-5.2.1-4.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.