From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 84EC453816; Wed, 21 Feb 2024 13:22:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708521761; cv=none; b=OlLv4Da++fhkJkevCiVFMLcqLIEd4YA3wyyPwmuBzIRhZafTW9w6Bdd5EEX8U5cWyvuc3QXpBHAz0emu3KhxfaH9yj+dL9w5sRpr9B/rRmr806QgaMMPc4Jo4gFfBbrpywHR2ciQocp5LE/ixCGuiawHqv3O2T/GVuaXgwfc3JQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708521761; c=relaxed/simple; bh=2ioa0P2FmDNmnlXud1Rnf8Slwjd08PvMAqMJMgBPKAw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=FsivJx1X/eejsrT/u5C178ybI3eaz7NyWCBEgnCPyR4wfSQKY/Fbe2Vlu9Rd77Z3Y7bzN0w/Kdv0+4BNCpjuMjiKymDf4RofyIZO9iRccS97JAa6pmHaYX5EO7srzYSkKqOQ3UalUNauSjdxxMrPWcsDSFOgNjzBcgEnWuBaHkk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=qYFIypHu; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="qYFIypHu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A785AC433F1; Wed, 21 Feb 2024 13:22:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1708521761; bh=2ioa0P2FmDNmnlXud1Rnf8Slwjd08PvMAqMJMgBPKAw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qYFIypHuRTzH3YbgNlk2/y/o1td3ZhaQ/yf5y+2QoWSPnysChw00K6JfyfTfysjFh vbRY4p3FyDt793E8vRCzD1Fx+nxwKmmiz9KZ739m4+7IGv2G8kzcEArOM4dL4yYMzw L+AWHVzMpw7Y3qTnhbDFjmRbC1nGCAXpb4K6h6jw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Junxiao Bi , Yu Kuai , Song Liu , Sasha Levin Subject: [PATCH 4.19 197/202] Revert "md/raid5: Wait for MD_SB_CHANGE_PENDING in raid5d" Date: Wed, 21 Feb 2024 14:08:18 +0100 Message-ID: <20240221125938.154860462@linuxfoundation.org> X-Mailer: git-send-email 2.43.2 In-Reply-To: <20240221125931.742034354@linuxfoundation.org> References: <20240221125931.742034354@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Junxiao Bi [ Upstream commit bed9e27baf52a09b7ba2a3714f1e24e17ced386d ] This reverts commit 5e2cf333b7bd5d3e62595a44d598a254c697cd74. That commit introduced the following race and can cause system hung. md_write_start: raid5d: // mddev->in_sync == 1 set "MD_SB_CHANGE_PENDING" // running before md_write_start wakeup it waiting "MD_SB_CHANGE_PENDING" cleared >>>>>>>>> hung wakeup mddev->thread ... waiting "MD_SB_CHANGE_PENDING" cleared >>>> hung, raid5d should clear this flag but get hung by same flag. The issue reverted commit fixing is fixed by last patch in a new way. Fixes: 5e2cf333b7bd ("md/raid5: Wait for MD_SB_CHANGE_PENDING in raid5d") Cc: stable@vger.kernel.org # v5.19+ Signed-off-by: Junxiao Bi Reviewed-by: Yu Kuai Signed-off-by: Song Liu Link: https://lore.kernel.org/r/20231108182216.73611-2-junxiao.bi@oracle.com Signed-off-by: Sasha Levin --- drivers/md/raid5.c | 12 ------------ 1 file changed, 12 deletions(-) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index b98abe927d06..e2fcc09a18cd 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -44,7 +44,6 @@ */ #include -#include #include #include #include @@ -6330,18 +6329,7 @@ static void raid5d(struct md_thread *thread) spin_unlock_irq(&conf->device_lock); md_check_recovery(mddev); spin_lock_irq(&conf->device_lock); - - /* - * Waiting on MD_SB_CHANGE_PENDING below may deadlock - * seeing md_check_recovery() is needed to clear - * the flag when using mdmon. - */ - continue; } - - wait_event_lock_irq(mddev->sb_wait, - !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags), - conf->device_lock); } pr_debug("%d stripes handled\n", handled); -- 2.43.0