From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35155) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d5oi8-0001n5-Ul for qemu-devel@nongnu.org; Wed, 03 May 2017 03:28:33 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1d5oi3-0005q4-Eb for qemu-devel@nongnu.org; Wed, 03 May 2017 03:28:32 -0400 Received: from mx1.redhat.com ([209.132.183.28]:54664) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1d5oi3-0005q0-8C for qemu-devel@nongnu.org; Wed, 03 May 2017 03:28:27 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id DA23080C04 for ; Wed, 3 May 2017 07:28:25 +0000 (UTC) From: Fam Zheng Date: Wed, 3 May 2017 15:28:19 +0800 Message-Id: <20170503072819.14462-1-famz@redhat.com> Subject: [Qemu-devel] [PATCH] dump: Acquire BQL around vm_start() in dump thread List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: pbonzini@redhat.com, armbru@redhat.com, peterx@redhat.com This fixes an assertion failure in the following backtrace: __GI___assert_fail memory_region_transaction_commit memory_region_add_eventfd virtio_pci_ioeventfd_assign virtio_bus_set_host_notifier virtio_blk_data_plane_start virtio_bus_start_ioeventfd virtio_vmstate_change vm_state_notify vm_prepare_start vm_start dump_cleanup dump_process dump_thread start_thread clone vm_start need BQL, acquire it if doing cleaning up from main thread. Signed-off-by: Fam Zheng --- dump.c | 7 +++++++ include/sysemu/dump.h | 1 + 2 files changed, 8 insertions(+) diff --git a/dump.c b/dump.c index f7b80d8..d9090a2 100644 --- a/dump.c +++ b/dump.c @@ -77,7 +77,13 @@ static int dump_cleanup(DumpState *s) memory_mapping_list_free(&s->list); close(s->fd); if (s->resume) { + if (s->detached) { + qemu_mutex_lock_iothread(); + } vm_start(); + if (s->detached) { + qemu_mutex_unlock_iothread(); + } } return 0; @@ -1804,6 +1810,7 @@ void qmp_dump_guest_memory(bool paging, const char *file, if (detach_p) { /* detached dump */ + s->detached = true; qemu_thread_create(&s->dump_thread, "dump_thread", dump_thread, s, QEMU_THREAD_DETACHED); } else { diff --git a/include/sysemu/dump.h b/include/sysemu/dump.h index ef931be..2672a15 100644 --- a/include/sysemu/dump.h +++ b/include/sysemu/dump.h @@ -157,6 +157,7 @@ typedef struct DumpState { uint32_t sh_info; bool have_section; bool resume; + bool detached; ssize_t note_size; hwaddr memory_offset; int fd; -- 2.9.3