Tom Callaway
5 years ago
parent
8836a41b17
commit
09149e272b
@ -0,0 +1,134 @@
|
||||
From bd59ce32629ef684624821419c43967b73d2989e Mon Sep 17 00:00:00 2001
|
||||
From: Hiroki Nakagawa <nhiroki@chromium.org>
|
||||
Date: Fri, 8 May 2020 08:25:31 +0000
|
||||
Subject: [PATCH] ServiceWorker: Avoid double destruction of
|
||||
ServiceWorkerObjectHost on connection error
|
||||
|
||||
This CL avoids the case where ServiceWorkerObjectHost is destroyed twice
|
||||
on ServiceWorkerObjectHost::OnConnectionError() when Chromium is built
|
||||
with the GCC build toolchain.
|
||||
|
||||
> How does the issue happen?
|
||||
|
||||
ServiceWorkerObjectHost has a cyclic reference like this:
|
||||
|
||||
ServiceWorkerObjectHost
|
||||
--([1] scoped_refptr)--> ServiceWorkerVersion
|
||||
--([2] std::unique_ptr)--> ServiceWorkerProviderHost
|
||||
--([3] std::unique_ptr)--> ServiceWorkerContainerHost
|
||||
--([4] std::unique_ptr)--> ServiceWorkerObjectHost
|
||||
|
||||
Note that ServiceWorkerContainerHost manages ServiceWorkerObjectHost in
|
||||
map<int64_t version_id, std::unique_ptr<ServiceWorkerObjectHost>>.
|
||||
|
||||
When ServiceWorkerObjectHost::OnConnectionError() is called, the
|
||||
function removes the reference [4] from the map, and destroys
|
||||
ServiceWorkerObjectHost. If the object host has the last reference [1]
|
||||
to ServiceWorkerVersion, the destruction also cuts off the references
|
||||
[2] and [3], and destroys ServiceWorkerProviderHost and
|
||||
ServiceWorkerContainerHost.
|
||||
|
||||
This seems to work well on the Chromium's default toolchain, but not
|
||||
work on the GCC toolchain. According to the report, destruction of
|
||||
ServiceWorkerContainerHost happens while the map owned by the container
|
||||
host is erasing the ServiceWorkerObjectHost, and this results in crash
|
||||
due to double destruction of the object host.
|
||||
|
||||
I don't know the reason why this happens only on the GCC toolchain, but
|
||||
I suspect the order of object destruction on std::map::erase() could be
|
||||
different depending on the toolchains.
|
||||
|
||||
> How does this CL fix this?
|
||||
|
||||
The ideal fix is to redesign the ownership model of
|
||||
ServiceWorkerVersion, but it's not feasible in the short term.
|
||||
|
||||
Instead, this CL avoids destruction of ServiceWorkerObjectHost on
|
||||
std::map::erase(). The new code takes the ownership of the object host
|
||||
from the map first, and then erases the entry from the map. This
|
||||
separates timings to erase the map entry and to destroy the object host,
|
||||
so the crash should no longer happen.
|
||||
|
||||
Bug: 1056598
|
||||
Change-Id: Id30654cb575bc557c42044d6f0c6f1f9bfaed613
|
||||
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2094496
|
||||
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
|
||||
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
|
||||
Cr-Commit-Position: refs/heads/master@{#766770}
|
||||
---
|
||||
.../service_worker_container_host.cc | 10 +++++
|
||||
.../service_worker_object_host_unittest.cc | 38 +++++++++++++++++++
|
||||
2 files changed, 48 insertions(+)
|
||||
|
||||
--- a/content/browser/service_worker/service_worker_container_host.cc
|
||||
+++ b/content/browser/service_worker/service_worker_container_host.cc
|
||||
@@ -713,6 +713,16 @@ void ServiceWorkerContainerHost::RemoveS
|
||||
int64_t version_id) {
|
||||
DCHECK_CURRENTLY_ON(ServiceWorkerContext::GetCoreThreadId());
|
||||
DCHECK(base::Contains(service_worker_object_hosts_, version_id));
|
||||
+
|
||||
+ // ServiceWorkerObjectHost to be deleted may have the last reference to
|
||||
+ // ServiceWorkerVersion that indirectly owns this ServiceWorkerContainerHost.
|
||||
+ // If we erase the object host directly from the map, |this| could be deleted
|
||||
+ // during the map operation and may crash. To avoid the case, we take the
|
||||
+ // ownership of the object host from the map first, and then erase the entry
|
||||
+ // from the map. See https://crbug.com/1056598 for details.
|
||||
+ std::unique_ptr<ServiceWorkerObjectHost> to_be_deleted =
|
||||
+ std::move(service_worker_object_hosts_[version_id]);
|
||||
+ DCHECK(to_be_deleted);
|
||||
service_worker_object_hosts_.erase(version_id);
|
||||
}
|
||||
|
||||
--- a/content/browser/service_worker/service_worker_object_host_unittest.cc
|
||||
+++ b/content/browser/service_worker/service_worker_object_host_unittest.cc
|
||||
@@ -200,6 +200,19 @@ class ServiceWorkerObjectHostTest : publ
|
||||
return registration_info;
|
||||
}
|
||||
|
||||
+ void CallOnConnectionError(ServiceWorkerContainerHost* container_host,
|
||||
+ int64_t version_id) {
|
||||
+ // ServiceWorkerObjectHost has the last reference to the version.
|
||||
+ ServiceWorkerObjectHost* object_host =
|
||||
+ GetServiceWorkerObjectHost(container_host, version_id);
|
||||
+ EXPECT_TRUE(object_host->version_->HasOneRef());
|
||||
+
|
||||
+ // Make sure that OnConnectionError induces destruction of the version and
|
||||
+ // the object host.
|
||||
+ object_host->receivers_.Clear();
|
||||
+ object_host->OnConnectionError();
|
||||
+ }
|
||||
+
|
||||
BrowserTaskEnvironment task_environment_;
|
||||
std::unique_ptr<EmbeddedWorkerTestHelper> helper_;
|
||||
scoped_refptr<ServiceWorkerRegistration> registration_;
|
||||
@@ -409,5 +422,30 @@ TEST_F(ServiceWorkerObjectHostTest, Disp
|
||||
events[0]->source_info_for_client->client_type);
|
||||
}
|
||||
|
||||
+// This is a regression test for https://crbug.com/1056598.
|
||||
+TEST_F(ServiceWorkerObjectHostTest, OnConnectionError) {
|
||||
+ const GURL scope("https://www.example.com/");
|
||||
+ const GURL script_url("https://www.example.com/service_worker.js");
|
||||
+ Initialize(std::make_unique<EmbeddedWorkerTestHelper>(base::FilePath()));
|
||||
+ SetUpRegistration(scope, script_url);
|
||||
+
|
||||
+ // Create the provider host.
|
||||
+ ASSERT_EQ(blink::ServiceWorkerStatusCode::kOk,
|
||||
+ StartServiceWorker(version_.get()));
|
||||
+
|
||||
+ // Set up the case where the last reference to the version is owned by the
|
||||
+ // service worker object host.
|
||||
+ ServiceWorkerContainerHost* container_host =
|
||||
+ version_->provider_host()->container_host();
|
||||
+ ServiceWorkerVersion* version_rawptr = version_.get();
|
||||
+ version_ = nullptr;
|
||||
+ ASSERT_TRUE(version_rawptr->HasOneRef());
|
||||
+
|
||||
+ // Simulate the connection error that induces the object host destruction.
|
||||
+ // This shouldn't crash.
|
||||
+ CallOnConnectionError(container_host, version_rawptr->version_id());
|
||||
+ base::RunLoop().RunUntilIdle();
|
||||
+}
|
||||
+
|
||||
} // namespace service_worker_object_host_unittest
|
||||
} // namespace content
|
||||
Loading…
Reference in new issue