From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vyacheslav Dubeyko Subject: Re: Kernel Bug: unable to handle kernel paging request Date: Sat, 27 Jul 2013 21:06:52 +0400 Message-ID: <680DC2BF-EEEC-445C-BA5B-DF966CABF1BA@dubeyko.com> References: <1374578141.2226.5.camel@slavad-ubuntu> Mime-Version: 1.0 (Apple Message framework v1085) Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=dubeyko.com; s=default; h=To:References:Message-Id:Content-Transfer-Encoding:Cc:Date:In-Reply-To:From:Content-Type:Mime-Version:Subject; bh=95EpaU3F9TWjAkT3/GGZJZ5SAwBQDwRS58y0oxTp0tM=; b=pZI6lDeT4Hk023mV6GNngF8pZX6M04cN9p8soTJ3nZtCu0foKBQDIH/w6FKn8t+Db0C7+ePg3M6XIdR4hYkfM/x3rKITW8ujZ8EmOT4YmgPr3AgBiQgaBrhZ1uQdBQiL; In-Reply-To: Sender: linux-nilfs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Content-Type: text/plain; charset="iso-8859-1" To: =?iso-8859-1?Q?J=E9r=F4me_Poulin?= Cc: linux-nilfs On Jul 26, 2013, at 10:13 PM, J=E9r=F4me Poulin wrote: > Good afternoon, >=20 > I have more informations to add to the bug. >=20 Thank you for additional info. [snip] > I was able to reproduce consistently the problem. > 1. Make a snapshot of a checkpoint and mount it. > 2. Read from the checkpoint (make a backup). > 3. Issue apt-get update. >=20 I tried to reproduce the issue but I haven't success in it. Could you describe the reproducing path in more details? Moreover, could you share lscp utility output for your NILFS2 partition= ? [snip] >=20 > Here are the log files. > 1. strace from the backup was still reading, it did not stop. > 2. apt-get-crash.log > 4362 13:32:04 read(6, " Debugging symbols\nHomepage: htt"..., 32052)= =3D 32052 > 4362 13:32:04 read(6, "tcp-wrappers/libwrap0-dev_7.6.q-"..., 32460) = =3D 32460 > 4362 13:32:04 read(6, "bdevel\nInstalled-Size: 542\nMaint"..., 32710= ) =3D 32710 > 4362 13:32:04 read(6, "ian.org>\nArchitecture: i386\nSour"..., 32558= ) =3D 32558 > 4362 13:32:04 read(6, "l-Maintainer: XCB Developers 4362 13:32:04 read(6, "ed: 9m\n\nPackage: libxcb-xvmc0-db"..., 31979= ) =3D 31979 > 4362 13:32:04 read(6, "ibz-dev\nFilename: pool/main/x/xf"..., 32335)= =3D 32335 > 4362 13:32:04 read(6, "n: Ubuntu\nSupported: 9m\nTask: my"..., 31903= ) =3D 31903 > 4362 13:32:04 read(6, "\nFilename: pool/main/libx/libxpm"..., 32467)= =3D 32467 > 4362 13:32:04 read(6, "buntu/+filebug\nOrigin: Ubuntu\nSu"..., 31982= ) =3D 31982 > 4362 13:32:04 read(6, "chpad.net/ubuntu/+filebug\nOrigin"..., 31976)= =3D 31976 > 4362 13:32:04 read(6, "buntu Developers 4362 13:32:04 read(6, "-utils\nDepends: debconf (>=3D 0.5)"..., 3246= 8) =3D 32468 > 4362 13:32:04 read(6, "top, mythbuntu-backend-slave, my"..., 31678) = =3D 31678 > 4362 13:32:04 read(6, "d5: 1b0992eebd45ca5ceadc775532a4"..., 32126) = =3D 32126 > 4362 13:32:04 read(6, " all\nSource: munin\nVersion: 2.0."..., 32535= ) =3D 32535 > 4362 13:32:04 read(6, "fice-core | openoffice.org-hunsp"..., 32373) = =3D 32373 > 4362 13:32:04 read(6, "ffice.org-dictionaries (1:3.3.0~"..., 32513) = =3D 32513 > 4362 13:32:04 read(6, "hbuntu-backend-master\n\nPackage: "..., 31756= ) =3D 31756 > 4362 13:32:04 read(6, "2614b9\nSHA256: bcc70d6577dd06565"..., 32118)= =3D 32118 > 4362 13:32:04 read(6, "17\nSHA256: d903f798a8c38fef2b992"..., 32339)= =3D 32339 > -- End of file -- >=20 Could you share the full strace output? Because in shared part of strace output I can't see any issue or failur= e. Moreover, the reported issue occurs in segstor thread. But, usually, se= gctor activity takes place after writing or flushing operation. So, it means for me th= at a reason of the issue is hidden in another part of the strace output or, maybe, in stra= ce output for backup operation. Could you share the strace output for backup operatio= n too? Thanks, Vyacheslav Dubeyko. -- To unsubscribe from this list: send the line "unsubscribe linux-nilfs" = in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html