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Sat, 6 Jul 2019 01:31:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1562376677; bh=xb4Fet0y9vfG5RQUzo0K8zZmsxlXBGkya2DNZIqQ99k=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=Twkd8sBzFmxz3XSDDQfZNFfnPY0O/7c2Fd+lH8BSXCb+knf7/UsAtYzPRIXgIhPw1 YNmdsBVie3nDEqOHEK3gVcqaG7TSRvbJ5MW9j1nfXpXL6gzzU8QCvxot6OVCt8w1eW L5U3IO6rflZMrFFxV9jwXpe6AAlEJYEiHjqJfQc0= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 8E7AF60590 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=stummala@codeaurora.org Date: Sat, 6 Jul 2019 07:01:12 +0530 From: Sahitya Tummala To: Chao Yu Message-ID: <20190706013112.GE8289@codeaurora.org> References: <1562302863-14418-1-git-send-email-stummala@codeaurora.org> <15bb7741-7c2f-8dc2-065f-ba1fcaf22050@huawei.com> <20190705110356.GC8289@codeaurora.org> <20190705134859.GD8289@codeaurora.org> <0143261e-5592-1ee2-e09d-437d2a7eac22@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <0143261e-5592-1ee2-e09d-437d2a7eac22@kernel.org> User-Agent: Mutt/1.5.21 (2010-09-15) X-Headers-End: 1hjZXw-007SXw-DC Subject: Re: [f2fs-dev] [PATCH] fsck: Fix data loss issue observed during SPO X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jaegeuk Kim , linux-f2fs-devel@lists.sourceforge.net Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net Hi Chao, On Sat, Jul 06, 2019 at 09:14:59AM +0800, Chao Yu wrote: > Hi Sahitya, > > On 2019-7-5 21:48, Sahitya Tummala wrote: > > Hi Chao, > > > > The journal doesn't look to be corrupted, but only block_addr > > in f2fs_nat_entry is 0 whereas nid and version seems to be valid. > > These could be just truncated nodes, right? > > Yes, but that should not fail the condition of journal check and result in > journal size truncation, right? > Yes, the patch fails for this condition as well and results into truncation of journal, due to this check addr < SM_I(sbi)->main_blkaddr in IS_VALID_BLK_ADDR(). Do you think we can correct it this way? diff --git a/fsck/f2fs.h b/fsck/f2fs.h index 417ca0b..00fb740 100644 --- a/fsck/f2fs.h +++ b/fsck/f2fs.h @@ -364,8 +364,8 @@ static inline bool IS_VALID_NID(struct f2fs_sb_info *sbi, u32 nid) static inline bool IS_VALID_BLK_ADDR(struct f2fs_sb_info *sbi, u32 addr) { - if (addr >= le64_to_cpu(F2FS_RAW_SUPER(sbi)->block_count) || - addr < SM_I(sbi)->main_blkaddr) { + if (addr && (addr >= le64_to_cpu(F2FS_RAW_SUPER(sbi)->block_count) || + addr < SM_I(sbi)->main_blkaddr)) { DBG(1, "block addr [0x%x]\n", addr); return 0; } Thanks, > Thanks, > > > > > Here is the full dump of nat journal entries after a SPO (this is not a > > issue case, but just a normal case with SPO) - > > > > [ 21.121325] fsck.f2fs: 0: addr 0 nid 5c5a ver 1\x0a > > [ 21.127509] fsck.f2fs: 1: addr 0 nid 4c1d ver 1\x0a > > [ 21.133760] fsck.f2fs: 2: addr 12075 nid 444f ver 0\x0a > > [ 21.140325] fsck.f2fs: 3: addr 0 nid 4307 ver 0\x0a > > [ 21.146510] fsck.f2fs: 4: addr 0 nid 4059 ver 1\x0a > > [ 21.152745] fsck.f2fs: 5: addr 0 nid 3e69 ver 1\x0a > > [ 21.158944] fsck.f2fs: 6: addr 0 nid 3cf9 ver 1\x0a > > [ 21.165128] fsck.f2fs: 7: addr 0 nid 3b7b ver 1\x0a > > [ 21.171362] fsck.f2fs: 8: addr 18f65 nid 34e2 ver 0\x0a > > [ 21.177903] fsck.f2fs: 9: addr 12126 nid 2c87 ver 0\x0a > > [ 21.184466] fsck.f2fs: 10: addr 0 nid 2a0a ver 1\x0a > > [ 21.190795] fsck.f2fs: 11: addr 0 nid 2565 ver 1\x0a > > [ 21.197070] fsck.f2fs: 12: addr 0 nid 1f48 ver 0\x0a > > [ 21.203369] fsck.f2fs: 13: addr 155bf nid 1d76 ver 0\x0a > > [ 21.210042] fsck.f2fs: 14: addr 19538 nid 18da ver 0\x0a > > [ 21.216675] fsck.f2fs: 15: addr 0 nid 157f ver 0\x0a > > [ 21.223037] fsck.f2fs: 16: addr d117 nid ac3 ver 0\x0a > > [ 21.229547] fsck.f2fs: 17: addr 11e48 nid 805 ver 0\x0a > > [ 21.236088] fsck.f2fs: 18: addr d112 nid 61c ver 0\x0a > > [ 21.242585] fsck.f2fs: 19: addr d00b nid 45b ver 0\x0a > > [ 21.249086] fsck.f2fs: 20: addr d111 nid 30d ver 0\x0a > > [ 21.255544] fsck.f2fs: 21: addr d110 nid 1b5 ver 0\x0a > > [ 21.262025] fsck.f2fs: 22: addr 0 nid 5e41 ver 1\x0a > > [ 21.268342] fsck.f2fs: 23: addr 0 nid 5e46 ver 0\x0a > > [ 21.274618] fsck.f2fs: 24: addr 0 nid 5a34 ver 1\x0a > > [ 21.280916] fsck.f2fs: 25: addr 0 nid 59fa ver 1\x0a > > [ 21.287192] fsck.f2fs: 26: addr 0 nid 57c3 ver 1\x0a > > [ 21.293526] fsck.f2fs: 27: addr 0 nid 5776 ver 1\x0a > > [ 21.299816] fsck.f2fs: 28: addr 0 nid 4f20 ver 1\x0a > > [ 21.306091] fsck.f2fs: 29: addr 0 nid 4ff7 ver 0\x0a > > [ 21.312416] fsck.f2fs: 30: addr 0 nid 47e1 ver 1\x0a > > [ 21.318715] fsck.f2fs: 31: addr 0 nid 4880 ver 1\x0a > > [ 21.324990] fsck.f2fs: 32: addr d118 nid ff4 ver 0\x0a > > [ 21.331498] fsck.f2fs: 33: addr d10c nid ff9 ver 0\x0a > > [ 21.337957] fsck.f2fs: 34: addr 0 nid 49ed ver 1\x0a > > [ 21.344290] fsck.f2fs: 35: addr 0 nid 497e ver 0\x0a > > [ 21.350612] fsck.f2fs: 36: addr fc5a nid 49d2 ver 0\x0a > > > > Thanks, > > > > On Fri, Jul 05, 2019 at 04:33:57PM +0530, Sahitya Tummala wrote: > >> Hi Chao, > >> > >> On Fri, Jul 05, 2019 at 06:11:47PM +0800, Chao Yu wrote: > >>> Hi Sahitya, > >>> > >>> On 2019/7/5 13:01, Sahitya Tummala wrote: > >>>> With the commit <979b25727800> ("fsck.f2fs: check validity of nat journal"), > >>>> there is a serious data loss issue observed during sudden power off tests. > >>> > >>> In that patch, since journal's data is untrusty, I just truncated n_nats to last > >>> valid one to fix original reported issue. > >> > >> The original issue will be fixed even without updating/truncating the n_nats > >> as we still have sanity checks on nid and blkaddr, right? > >> > >>> > >>> Actually, the problem here is we don't know which data is correct and which data > >>> is corrupted in nat or sit journal, so even we skip broken entry without > >>> modifying journal->n_{nats,sits}, latter entry may still contain broken data(but > >>> it may pass validation check), and those entries may cause potential data > >>> loss/corruption... > >>> > >> > >> This issue was reported by a customer in the following test scenario - > >> > >> Update the password in Android and then force crash. It is verified that > >> all the files related to password data has fsync() already. > >> > >> After some iterations (3-4) of this test, it is found password related files are > >> lost, failing the phone to bootup. > >> > >> Without this patch ("fsck.f2fs: check validity of nat journal"), they don't see > >> such issue. It means that the data present in journal seems to be valid atleast > >> in this case and truncating is causing to loose the valid data/files. > >> > >>> It looks no matter how we change the codes, we still may face data > >>> loos/corruption issues. > >>> > >> > >> Yes, maybe in some cases, the data loss is still expected, but there are > >> chances that data may be valid as well, which is confirmed by the test case above. > >> > >>> IMO, we need to find out the root cause of data corruption, So my question is > >>> that why sudden power off tests can make nat journal being corrupted? I doubt > >>> that in-place update method on checkpoint area of fsck may cause this... any > >>> other thoughts? > >>> > >> > >> In case of sudden power off, I have printed the all the journal entries in the > >> NAT and I several entries with valid blkaddr and nid as below - > >> > >> [ 21.007649] fsck.f2fs: withfix: 0: addr 1c373 nid 45b\x0a > >> [ 21.014399] fsck.f2fs: withfix: 1: addr 1c2c1 nid 1b5\x0a > >> [ 21.021151] fsck.f2fs: \x09Error: f2fs_init_nid_bitmap: addr(0) i/nats 2/37 is invalid!!!\x0a > >> [ 21.030860] fsck.f2fs: withfix: 3: addr 1c1f7 nid 19b2\x0a > >> [ 21.037674] fsck.f2fs: \x09Error: f2fs_init_nid_bitmap: addr(0) i/nats 4/37 is invalid!!!\x0a > >> [ 21.047353] fsck.f2fs: \x09Error: f2fs_init_nid_bitmap: addr(0) i/nats 5/37 is invalid!!!\x0a > >> [ 21.057062] fsck.f2fs: withfix: 6: addr 1c377 nid ac3\x0a > >> [ 21.063841] fsck.f2fs: withfix: 7: addr 1c378 nid ac9\x0a > >> [ 21.070634] fsck.f2fs: withfix: 8: addr 1b2fe nid 807\x0a > >> [ 21.077356] fsck.f2fs: withfix: 9: addr 17aeb nid 805\x0a > >> [ 21.084102] fsck.f2fs: \x09Error: f2fs_init_nid_bitmap: addr(0) i/nats 10/37 is invalid!!!\x0a > >> [ 21.093891] fsck.f2fs: \x09Error: f2fs_init_nid_bitmap: addr(0) i/nats 11/37 is invalid!!!\x0a > >> [ 21.103662] fsck.f2fs: \x09Error: f2fs_init_nid_bitmap: addr(0) i/nats 12/37 is invalid!!!\x0a > >> [ 21.113450] fsck.f2fs: \x09Error: f2fs_init_nid_bitmap: addr(0) i/nats 13/37 is invalid!!!\x0a > >> [ 21.123227] fsck.f2fs: \x09Error: f2fs_init_nid_bitmap: addr(0) i/nats 14/37 is invalid!!!\x0a > >> [ 21.133022] fsck.f2fs: \x09Error: f2fs_init_nid_bitmap: addr(0) i/nats 15/37 is invalid!!!\x0a > >> [ 21.142792] fsck.f2fs: \x09Error: f2fs_init_nid_bitmap: addr(0) i/nats 16/37 is invalid!!!\x0a > >> [ 21.152580] fsck.f2fs: withfix: 17: addr 1c37f nid ff4\x0a > >> [ 21.159415] fsck.f2fs: withfix: 18: addr 1c36c nid ff9\x0a > >> [ 21.166229] fsck.f2fs: \x09Error: f2fs_init_nid_bitmap: addr(0) i/nats 19/37 is invalid!!!\x0a > >> [ 21.176039] fsck.f2fs: \x09Error: f2fs_init_nid_bitmap: addr(0) i/nats 20/37 is invalid!!!\x0a > >> [ 21.185831] fsck.f2fs: \x09Error: f2fs_init_nid_bitmap: addr(0) i/nats 21/37 is invalid!!!\x0a > >> [ 21.195631] fsck.f2fs: \x09Error: f2fs_init_nid_bitmap: addr(0) i/nats 22/37 is invalid!!!\x0a > >> [ 21.205394] fsck.f2fs: withfix: 23: addr 1c2f3 nid 61c\x0a > >> [ 21.212257] fsck.f2fs: withfix: 24: addr 1c391 nid 641\x0a > >> [ 21.219093] fsck.f2fs: withfix: 25: addr 1c386 nid 33b\x0a > >> [ 21.225905] fsck.f2fs: withfix: 26: addr 1c356 nid 258\x0a > >> [ 21.232767] fsck.f2fs: withfix: 27: addr 1c2f2 nid 382\x0a > >> [ 21.239601] fsck.f2fs: \x09Error: f2fs_init_nid_bitmap: addr(0) i/nats 28/37 is invalid!!!\x0a > >> [ 21.249398] fsck.f2fs: \x09Error: f2fs_init_nid_bitmap: addr(0) i/nats 29/37 is invalid!!!\x0a > >> [ 21.259160] fsck.f2fs: \x09Error: f2fs_init_nid_bitmap: addr(0) i/nats 30/37 is invalid!!!\x0a > >> [ 21.268970] fsck.f2fs: withfix: 31: addr 1ac03 nid 1ccd\x0a > >> [ 21.275874] fsck.f2fs: withfix: 32: addr 1c395 nid a57\x0a > >> [ 21.282709] fsck.f2fs: withfix: 33: addr 1c392 nid 92e\x0a > >> [ 21.289564] fsck.f2fs: withfix: 34: addr 1c38b nid aa1\x0a > >> [ 21.296377] fsck.f2fs: withfix: 35: addr 1c393 nid 931\x0a > >> [ 21.303240] fsck.f2fs: withfix: 36: addr 1c394 nid a35\x0a > >> > >> Thanks, > >> > >>> Thanks, > >>> > >>>> > >>>> The reason is due to incorrect update of journal->n_nats in that patch. > >>>> When fsck encounters a nat journal entry with invalid blkaddr/nid, it > >>>> updates journal->n_nats with the index of such first entry and then continues > >>>> the for loop which scans all nats in journal in f2fs_init_nid_bitmap(). > >>>> But that loop doesn't continue and doesn't update nm_i->nid_bitmap as well, > >>>> as it fails the for loop condition i < nats_in_cursum(journal). > >>>> > >>>> There could be several other valid entries in the journal after this > >>>> invalid entry. Due to this invalid journal->n_nats, build_nat_area_bitmap() > >>>> could not be build properly for valid nat journal entries. It further results > >>>> into these fsck asserts/errors and causes data loss due to incorrect fsck fix. > >>>> > >>>> [ASSERT] (sanity_check_nid: 372) --> nid[0xfb01] ino is 0\x0a > >>>> [FIX] (__chk_dentries:1438) --> Unlink [0xfb01] - _JeNcl242yB3Apz2MW,VOh6WmjsVht1W len[0x1c], type[0x1]\x0a > >>>> [ASSERT] (sanity_check_nid: 372) --> nid[0xfa2d] ino is 0\x0a > >>>> [FIX] (__chk_dentries:1438) --> Unlink [0xfa2d] - _++vN7axccjjGNI,TQEVmcOemY1EAAAA len[0x14], type[0x1]\x0a > >>>> ... > >>>> NID[0xba5] is unreachable\x0a > >>>> NID[0xfa9] is unreachable\x0a > >>>> ... > >>>> [FIX] (nullify_nat_entry:2089) --> Remove nid [0xba5] in NAT\x0a > >>>> [FIX] (nullify_nat_entry:2089) --> Remove nid [0xfa9] in NAT\x0a > >>>> ... > >>>> > >>>> Fixes: 979b25727800 ("fsck.f2fs: check validity of nat journal") > >>>> Signed-off-by: Sahitya Tummala > >>>> --- > >>>> fsck/mount.c | 2 -- > >>>> 1 file changed, 2 deletions(-) > >>>> > >>>> diff --git a/fsck/mount.c b/fsck/mount.c > >>>> index 60e0e4a..1b93f49 100644 > >>>> --- a/fsck/mount.c > >>>> +++ b/fsck/mount.c > >>>> @@ -1160,7 +1160,6 @@ static int f2fs_init_nid_bitmap(struct f2fs_sb_info *sbi) > >>>> addr = le32_to_cpu(nat_in_journal(journal, i).block_addr); > >>>> if (!IS_VALID_BLK_ADDR(sbi, addr)) { > >>>> MSG(0, "\tError: f2fs_init_nid_bitmap: addr(%u) is invalid!!!\n", addr); > >>>> - journal->n_nats = cpu_to_le16(i); > >>>> c.fix_on = 1; > >>>> continue; > >>>> } > >>>> @@ -1168,7 +1167,6 @@ static int f2fs_init_nid_bitmap(struct f2fs_sb_info *sbi) > >>>> nid = le32_to_cpu(nid_in_journal(journal, i)); > >>>> if (!IS_VALID_NID(sbi, nid)) { > >>>> MSG(0, "\tError: f2fs_init_nid_bitmap: nid(%u) is invalid!!!\n", nid); > >>>> - journal->n_nats = cpu_to_le16(i); > >>>> c.fix_on = 1; > >>>> continue; > >>>> } > >>>> > >> > >> -- > >> -- > >> Sent by a consultant of the Qualcomm Innovation Center, Inc. > >> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum. > >> > >> > >> _______________________________________________ > >> Linux-f2fs-devel mailing list > >> Linux-f2fs-devel@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel > > -- -- Sent by a consultant of the Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum. _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel