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Do not execute MJIT copy job when ISeq is GC-ed

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I assumed that ISeq is never GC-ed by `in_jit` + `mjit_mark` on copy job
ISeq, but unfortunately I found SEGV on `mjit_copy_job_handler` in which
iseq->body was somehow Qnil. And it seems to be fixed by disabling the
job when `mjit_free_iseq` is called for the ISeq.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67551 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
k0kubun 2019-04-14 12:40:44 +00:00
parent 1222534719
commit e45c9a40a2
2 changed files with 13 additions and 3 deletions
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10
mjit.c
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@ -33,11 +33,16 @@ mjit_copy_job_handler(void *data)
// Make sure that this job is never executed when:
// 1. job is being modified
// 2. alloca memory inside job is expired
// Note that job->iseq is guarded from GC by `mjit_mark`.
// 3. ISeq is GC-ed
if (job->finish_p) {
CRITICAL_SECTION_FINISH(3, "in mjit_copy_job_handler");
return;
}
else if (job->iseq == NULL) { // ISeq GC notified in mjit_mark_iseq
job->finish_p = true;
CRITICAL_SECTION_FINISH(3, "in mjit_copy_job_handler");
return;
}
const struct rb_iseq_constant_body *body = job->iseq->body;
if (job->cc_entries) {
@ -113,6 +118,9 @@ mjit_free_iseq(const rb_iseq_t *iseq)
if (!mjit_enabled)
return;
CRITICAL_SECTION_START(4, "mjit_free_iseq");
if (mjit_copy_job.iseq == iseq) {
mjit_copy_job.iseq = NULL;
}
if (iseq->body->jit_unit) {
// jit_unit is not freed here because it may be referred by multiple
// lists of units. `get_from_list` and `mjit_finish` do the job.

6
mjit_worker.c
View file

@ -1195,15 +1195,17 @@ mjit_copy_cache_from_main_thread(const rb_iseq_t *iseq, struct rb_call_cache *cc
}
CRITICAL_SECTION_START(3, "in mjit_copy_cache_from_main_thread");
bool result = job->finish_p;
bool success_p = job->finish_p;
// Disable dispatching this job in mjit_copy_job_handler while memory allocated by alloca
// could be expired after finishing this function.
job->finish_p = true;
in_jit = true; // Prohibit GC during JIT compilation
if (job->iseq == NULL) // ISeq GC is notified in mjit_mark_iseq
success_p = false;
job->iseq = NULL; // Allow future GC of this ISeq from here
CRITICAL_SECTION_FINISH(3, "in mjit_copy_cache_from_main_thread");
return result;
return success_p;
}
// The function implementing a worker. It is executed in a separate