From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from nautica.notk.org (nautica.notk.org [91.121.71.147]) (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 AF1BA182AE; Sat, 3 Feb 2024 13:06:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.121.71.147 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706965566; cv=none; b=rQ24vsdDx7OU7/bB0VcmoE+pvvQQZwxkFEYeKuUUvIjwt1LnuQ6qD2At3Qzwzqca3bB/ju4H58GqKN2eDkUhz7s6q7C3sLU+xGbJYCVmoOBE3eR3SuFtNLcPpacqp5LMp01Np+RECdsDD0suGwKEpJSuxYFY0zKDfpwFRWNySz0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706965566; c=relaxed/simple; bh=qOQRRYdzSTfTJ/UMkN2de27peXui9N7BJG5gY0Al9Xg=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=iE1QFsDXXAeqV/22/IQTDOHX+V00UeMs971TRHDUkmsWDqPt7LtfAIGdTbk/pTH9DKpsmEv2gGcfEcxLBCTplDnMs+uRHG5N6Ukl3vIUC+ViHB+LftcBUxsahln5LuaVHDA/SwQzl6DqhesE6/y8tRtsXGizJ54H/1o1+afA83Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=codewreck.org; spf=pass smtp.mailfrom=codewreck.org; dkim=pass (2048-bit key) header.d=codewreck.org header.i=@codewreck.org header.b=GRqomXmW; dkim=pass (2048-bit key) header.d=codewreck.org header.i=@codewreck.org header.b=e5+fSlKh; arc=none smtp.client-ip=91.121.71.147 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=codewreck.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=codewreck.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=codewreck.org header.i=@codewreck.org header.b="GRqomXmW"; dkim=pass (2048-bit key) header.d=codewreck.org header.i=@codewreck.org header.b="e5+fSlKh" Received: by nautica.notk.org (Postfix, from userid 108) id 34D1FC01C; Sat, 3 Feb 2024 14:05:54 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=codewreck.org; s=2; t=1706965554; bh=MHAYm8L9KXXS9In1gHIi35HSTfn1ejSwBESi0dh8u8o=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=GRqomXmWXgreBnG8JZUxbMPhOW96Khhc2tp+1THFlCFRoDogJFAsKY5ciq6ckQffa Kay/4VmyebNFAXAWaLi65TYmt7dnLe/4eomFU5kkkhsI9nmxYmpNUj2QbZaMXvdLDH QczzoB8yvjOtcZ8r2ZuFse3ekXILnFIbGYBLhPbJWCubrG+J5AFFpXtISHQVsDAJjs TZpoFQysXI6eshU8WpUsTcOz74bV11fXOJJgDoMQ3TjlqEowbAt0Uhd1GslUEeumBd M/hDR84YhJeXK2hBOlIvszIjBrMiCIPiL7XZJYrk8aQ0qngohCOWZ3sGNoRvYWppMJ F2iAsn2N/S4YQ== X-Spam-Level: Received: from gaia.codewreck.org (localhost [127.0.0.1]) by nautica.notk.org (Postfix) with ESMTPS id BC269C009; Sat, 3 Feb 2024 14:05:49 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=codewreck.org; s=2; t=1706965553; bh=MHAYm8L9KXXS9In1gHIi35HSTfn1ejSwBESi0dh8u8o=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=e5+fSlKhk6McUCajMlHY++695qW+1FtvB9F8MSRal968n5hsVaEp0JnHmvojsmrER Kcpa47gysDKqVf+Rbrkm5O1OVMKI8asVLGzUcBWJ7IqoUvFS0uOHBY5eHg+XiH35Li ZvWNBxXJtAdBWgOQR2FWn3fsfIrXqBekSWBkLSo4IbAayoKtLUqTm9Xywx5qEWi4a/ zC8IbiqbIXu9ZkRmbW2EJHXgzWc3b0LebgbeOmzBiLp7wGx8aAHDe2z0fD/D25CRph kSPud6FD+BMVAzKbV8xBGJH4W4caOwXqWiLLsMusfSLo5yIAVJDenLArKyk/At+qu4 GIc3jo1ahrsTg== Received: from localhost (gaia.codewreck.org [local]) by gaia.codewreck.org (OpenSMTPD) with ESMTPA id f2d44841; Sat, 3 Feb 2024 13:05:43 +0000 (UTC) Date: Sat, 3 Feb 2024 22:05:28 +0900 From: Dominique Martinet To: Al Viro , Chandan Babu R Cc: "Darrick J. Wong" , linux-fsdevel , linux-xfs@vger.kernel.org, brauner@kernel.org, jack@suse.cz Subject: Re: [BUG REPORT] shrink_dcache_parent() loops indefinitely on a next-20240102 kernel Message-ID: References: <87le96lorq.fsf@debian-BULLSEYE-live-builder-AMD64> <20240104043420.GT361584@frogsfrogsfrogs> <87sf3d8c0u.fsf@debian-BULLSEYE-live-builder-AMD64> <874jfbjimn.fsf@debian-BULLSEYE-live-builder-AMD64> <20240118063930.GP1674809@ZenIV> <87ede8787u.fsf@debian-BULLSEYE-live-builder-AMD64> <20240123114043.GC2087318@ZenIV> <8734ulsykv.fsf@debian-BULLSEYE-live-builder-AMD64> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <8734ulsykv.fsf@debian-BULLSEYE-live-builder-AMD64> Hello -- I've also hit this on master as of a few days ago (on 021533194476 ("Kconfig: Disable -Wstringop-overflow for GCC globally")) just running some short lived docker container in a loop -- the last process of the mount namespace exiting cleans up the mess docker had set up and sometimes get caught there: #5 [ffff9f0fcd927c48] select_collect at ffffffffb2ffa6c2 #6 [ffff9f0fcd927c58] d_walk at ffffffffb2ffb0a8 #7 [ffff9f0fcd927cb0] shrink_dcache_parent at ffffffffb2ffd53e #8 [ffff9f0fcd927cf8] shrink_dcache_for_umount at ffffffffb2ffd8e7 #9 [ffff9f0fcd927d20] generic_shutdown_super at ffffffffb2fdc39a #10 [ffff9f0fcd927d38] kill_litter_super at ffffffffb2fdc673 #11 [ffff9f0fcd927d50] deactivate_locked_super at ffffffffb2fdd37f #12 [ffff9f0fcd927d68] cleanup_mnt at ffffffffb3008d1d #13 [ffff9f0fcd927d90] task_work_run at ffffffffb2cd97e9 #14 [ffff9f0fcd927db0] do_exit at ffffffffb2cb1c9c #15 [ffff9f0fcd927e10] do_group_exit at ffffffffb2cb264d #16 [ffff9f0fcd927e38] __x64_sys_exit_group at ffffffffb2cb26c4 #17 [ffff9f0fcd927e40] do_syscall_64 at ffffffffb376ea47 (I'm trying to reproduce another networking bug with that, it doesn't happen very often but I noticed docker hangs once in a while, more often after I reduced how much memory I gave to this VM) Reverting just 57851607326a ("get rid of DCACHE_GENOCIDE") seems to get rid of the issue at this point, I'm pretty confident it's no longer happening by now but I'll reply again tomorrow if I hit the problem again overnight. Thanks, -- Dominique Martinet | Asmadeus