https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67659
Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |NEW
CC| |trippels at gcc dot gnu.org
Component|other |tree-optimization
Known to work| |4.9.3, 6.0
Summary|ICE: Linux |[5 regression] ICE:
|kernel/rcu/tree.c:3261:6 |segfault: Linux
| |kernel/rcu/tree.c:3261:6
Known to fail| |5.2.1
--- Comment #2 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
markus@x4 tmp % cat tree.i
struct list_head {
struct list_head *next, *prev;
} typedef call_rcu_func_t;
struct __wait_queue_head {
int lock;
struct list_head task_list;
};
struct completion {
int done;
struct __wait_queue_head wait;
};
int call_rcu_sched;
void fn1(unsigned long p1) {
__asm__("" : : : "memory");
if (~0UL / 2 >= p1) {
call_rcu_func_t __crcu_array[] = {call_rcu_sched};
int __n = sizeof({});
struct completion __rs_array[__n];
fn2(0, 1, __crcu_array, __rs_array);
}
}
void fn3(unsigned long p1) {
__asm__("" : : : "memory");
if (~0UL / 2 >= p1) {
call_rcu_func_t __crcu_array[] = {call_rcu_sched};
int __n = sizeof({});
struct completion __rs_array[__n];
fn2(0, 1, __crcu_array, __rs_array);
}
}
markus@x4 tmp % gdb --args gcc -O3 -c -w tree.i
Reading symbols from gcc...done.
(gdb) run
Starting program: /usr/bin/gcc -O3 -c -w tree.i
process 16753 is executing new program:
/usr/x86_64-pc-linux-gnu/gcc-bin/5.2.1/gcc
[New process 16757]
process 16757 is executing new program:
/usr/libexec/gcc/x86_64-pc-linux-gnu/5.2.1/cc1
Program received signal SIGSEGV, Segmentation fault.
[Switching to process 16757]
0x00000000007fce50 in ccp_fold_stmt(gimple_stmt_iterator*) [clone .cold.97] ()
(gdb) bt
#0 0x00000000007fce50 in ccp_fold_stmt(gimple_stmt_iterator*) [clone .cold.97]
()
#1 0x0000000000f509c1 in
substitute_and_fold_dom_walker::before_dom_children(basic_block_def*) ()
#2 0x000000000107f821 in dom_walker::walk(basic_block_def*) ()
#3 0x0000000000f505e1 in substitute_and_fold(tree_node* (*)(tree_node*), bool
(*)(gimple_stmt_iterator*), bool) ()
#4 0x0000000000ee9b2a in (anonymous namespace)::pass_ccp::execute(function*)
()
#5 0x0000000000721a13 in execute_one_pass(opt_pass*) ()
#6 0x0000000000722fb2 in execute_pass_list_1(opt_pass*) ()
#7 0x0000000000722fe3 in execute_pass_list_1(opt_pass*) ()
#8 0x0000000000e34619 in execute_pass_list(function*, opt_pass*) ()
#9 0x0000000001104e27 in symbol_table::compile() ()
#10 0x00000000011045fe in symbol_table::finalize_compilation_unit() ()
#11 0x0000000000c2b473 in c_write_global_declarations() ()
#12 0x0000000001148411 in compile_file() ()
#13 0x0000000000c20831 in toplev::main(int, char**) ()
#14 0x0000000000c20c8e in main ()
-fno-ipa-icf "fixes" the issue.
