From patchwork Mon May 27 08:20:52 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Tokarev X-Patchwork-Id: 13674807 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C9978C25B74 for ; Mon, 27 May 2024 08:24:12 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sBVd5-0001HX-Gp; Mon, 27 May 2024 04:22:51 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sBVc1-0000v3-Px; Mon, 27 May 2024 04:21:52 -0400 Received: from isrv.corpit.ru ([86.62.121.231]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sBVbz-0000gt-LB; Mon, 27 May 2024 04:21:45 -0400 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id A95B46A55D; Mon, 27 May 2024 11:22:12 +0300 (MSK) Received: from tls.msk.ru (mjt.wg.tls.msk.ru [192.168.177.130]) by tsrv.corpit.ru (Postfix) with SMTP id D3535D84FB; Mon, 27 May 2024 11:21:38 +0300 (MSK) Received: (nullmailer pid 66354 invoked by uid 1000); Mon, 27 May 2024 08:21:38 -0000 From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, Li Zhijian , Fabiano Rosas , Zhang Chen , Peter Xu , Michael Tokarev Subject: [Stable-9.0.1 01/44] migration/colo: Fix bdrv_graph_rdlock_main_loop: Assertion `!qemu_in_coroutine()' failed. Date: Mon, 27 May 2024 11:20:52 +0300 Message-Id: <20240527082138.66217-1-mjt@tls.msk.ru> X-Mailer: git-send-email 2.39.2 In-Reply-To: References: MIME-Version: 1.0 Received-SPF: pass client-ip=86.62.121.231; envelope-from=mjt@tls.msk.ru; helo=isrv.corpit.ru X-Spam_score_int: -68 X-Spam_score: -6.9 X-Spam_bar: ------ X-Spam_report: (-6.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Li Zhijian bdrv_activate_all() should not be called from the coroutine context, move it to the QEMU thread colo_process_incoming_thread() with the bql_lock protected. The backtrace is as follows: #4 0x0000561af7948362 in bdrv_graph_rdlock_main_loop () at ../block/graph-lock.c:260 #5 0x0000561af7907a68 in graph_lockable_auto_lock_mainloop (x=0x7fd29810be7b) at /patch/to/qemu/include/block/graph-lock.h:259 #6 0x0000561af79167d1 in bdrv_activate_all (errp=0x7fd29810bed0) at ../block.c:6906 #7 0x0000561af762b4af in colo_incoming_co () at ../migration/colo.c:935 #8 0x0000561af7607e57 in process_incoming_migration_co (opaque=0x0) at ../migration/migration.c:793 #9 0x0000561af7adbeeb in coroutine_trampoline (i0=-106876144, i1=22042) at ../util/coroutine-ucontext.c:175 #10 0x00007fd2a5cf21c0 in () at /lib64/libc.so.6 Cc: qemu-stable@nongnu.org Cc: Fabiano Rosas Closes: https://gitlab.com/qemu-project/qemu/-/issues/2277 Fixes: 2b3912f135 ("block: Mark bdrv_first_blk() and bdrv_is_root_node() GRAPH_RDLOCK") Signed-off-by: Li Zhijian Reviewed-by: Zhang Chen Tested-by: Zhang Chen Reviewed-by: Fabiano Rosas Link: https://lore.kernel.org/r/20240417025634.1014582-1-lizhijian@fujitsu.com Signed-off-by: Peter Xu (cherry picked from commit 2cc637f1ea08d2a1b19fc5b1a30bc609f948de93) Signed-off-by: Michael Tokarev diff --git a/migration/colo.c b/migration/colo.c index 84632a603e..5600a43d78 100644 --- a/migration/colo.c +++ b/migration/colo.c @@ -835,6 +835,16 @@ static void *colo_process_incoming_thread(void *opaque) return NULL; } + /* Make sure all file formats throw away their mutable metadata */ + bql_lock(); + bdrv_activate_all(&local_err); + if (local_err) { + bql_unlock(); + error_report_err(local_err); + return NULL; + } + bql_unlock(); + failover_init_state(); mis->to_src_file = qemu_file_get_return_path(mis->from_src_file); @@ -922,7 +932,6 @@ out: int coroutine_fn colo_incoming_co(void) { MigrationIncomingState *mis = migration_incoming_get_current(); - Error *local_err = NULL; QemuThread th; assert(bql_locked()); @@ -931,13 +940,6 @@ int coroutine_fn colo_incoming_co(void) return 0; } - /* Make sure all file formats throw away their mutable metadata */ - bdrv_activate_all(&local_err); - if (local_err) { - error_report_err(local_err); - return -EINVAL; - } - qemu_thread_create(&th, "COLO incoming", colo_process_incoming_thread, mis, QEMU_THREAD_JOINABLE);