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qio: Inherit follow_coroutine_ctx across TLS

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Since qemu 8.2, the combination of NBD + TLS + iothread crashes on an
assertion failure:

qemu-kvm: ../io/channel.c:534: void qio_channel_restart_read(void *): Assertion `qemu_get_current_aio_context() == qemu_coroutine_get_aio_context(co)' failed.

It turns out that when we removed AioContext locking, we did so by
having NBD tell its qio channels that it wanted to opt in to
qio_channel_set_follow_coroutine_ctx(); but while we opted in on the
main channel, we did not opt in on the TLS wrapper channel.
qemu-iotests has coverage of NBD+iothread and NBD+TLS, but apparently
no coverage of NBD+TLS+iothread, or we would have noticed this
regression sooner.  (I'll add that in the next patch)

But while we could manually opt in to the TLS channel in nbd/server.c
(a one-line change), it is more generic if all qio channels that wrap
other channels inherit the follow status, in the same way that they
inherit feature bits.

CC: Stefan Hajnoczi <stefanha@redhat.com>
CC: Daniel P. Berrangé <berrange@redhat.com>
CC: qemu-stable@nongnu.org
Fixes: https://issues.redhat.com/browse/RHEL-34786
Fixes: 06e0f098 ("io: follow coroutine AioContext in qio_channel_yield()", v8.2.0)
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-ID: <20240518025246.791593-5-eblake@redhat.com>
This commit is contained in:
Eric Blake 2024-05-17 21:50:14 -05:00
parent 3b2fe44bb7
commit 199e84de1c
2 changed files with 16 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
io/channel-tls.c
View File

@ -69,37 +69,40 @@ qio_channel_tls_new_server(QIOChannel *master,
const char *aclname,
Error **errp)
{
QIOChannelTLS *ioc;
QIOChannelTLS *tioc;
QIOChannel *ioc;
ioc = QIO_CHANNEL_TLS(object_new(TYPE_QIO_CHANNEL_TLS));
tioc = QIO_CHANNEL_TLS(object_new(TYPE_QIO_CHANNEL_TLS));
ioc = QIO_CHANNEL(tioc);
ioc->master = master;
tioc->master = master;
ioc->follow_coroutine_ctx = master->follow_coroutine_ctx;
if (qio_channel_has_feature(master, QIO_CHANNEL_FEATURE_SHUTDOWN)) {
qio_channel_set_feature(QIO_CHANNEL(ioc), QIO_CHANNEL_FEATURE_SHUTDOWN);
qio_channel_set_feature(ioc, QIO_CHANNEL_FEATURE_SHUTDOWN);
}
object_ref(OBJECT(master));
ioc->session = qcrypto_tls_session_new(
tioc->session = qcrypto_tls_session_new(
creds,
NULL,
aclname,
QCRYPTO_TLS_CREDS_ENDPOINT_SERVER,
errp);
if (!ioc->session) {
if (!tioc->session) {
goto error;
}
qcrypto_tls_session_set_callbacks(
ioc->session,
tioc->session,
qio_channel_tls_write_handler,
qio_channel_tls_read_handler,
ioc);
tioc);
trace_qio_channel_tls_new_server(ioc, master, creds, aclname);
return ioc;
trace_qio_channel_tls_new_server(tioc, master, creds, aclname);
return tioc;
error:
object_unref(OBJECT(ioc));
object_unref(OBJECT(tioc));
return NULL;
}
@ -116,6 +119,7 @@ qio_channel_tls_new_client(QIOChannel *master,
ioc = QIO_CHANNEL(tioc);
tioc->master = master;
ioc->follow_coroutine_ctx = master->follow_coroutine_ctx;
if (qio_channel_has_feature(master, QIO_CHANNEL_FEATURE_SHUTDOWN)) {
qio_channel_set_feature(ioc, QIO_CHANNEL_FEATURE_SHUTDOWN);
}

1
io/channel-websock.c
View File

@ -883,6 +883,7 @@ qio_channel_websock_new_server(QIOChannel *master)
ioc = QIO_CHANNEL(wioc);
wioc->master = master;
ioc->follow_coroutine_ctx = master->follow_coroutine_ctx;
if (qio_channel_has_feature(master, QIO_CHANNEL_FEATURE_SHUTDOWN)) {
qio_channel_set_feature(ioc, QIO_CHANNEL_FEATURE_SHUTDOWN);
}