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From:   Jose R R <jose.r.r@metztli.com>
Date:   Thu, 1 Mar 2018 01:15:24 -0800
Message-ID: <CAM12Q5TBGwtcMk1pgN70DeqsP7TWtdC4WXhx8jUJe0VekXZJBQ@mail.gmail.com>
Subject: Re: EXT4 Oops (Re: [PATCH V15 06/22] mmc: block: Add blk-mq support)
To:     Adrian Hunter <adrian.hunter@intel.com>
Cc:     "Theodore Ts'o" <tytso@mit.edu>,
        Andreas Dilger <adilger.kernel@dilger.ca>,
        Dmitry Osipenko <digetx@gmail.com>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        linux-mmc <linux-mmc@vger.kernel.org>,
        linux-block <linux-block@vger.kernel.org>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Bough Chen <haibo.chen@nxp.com>,
        Alex Lemberg <alex.lemberg@sandisk.com>,
        Mateusz Nowak <mateusz.nowak@intel.com>,
        Yuliy Izrailov <Yuliy.Izrailov@sandisk.com>,
        Jaehoon Chung <jh80.chung@samsung.com>,
        Dong Aisheng <dongas86@gmail.com>,
        Das Asutosh <asutoshd@codeaurora.org>,
        Zhangfei Gao <zhangfei.gao@gmail.com>,
        Sahitya Tummala <stummala@codeaurora.org>,
        Harjani Ritesh <riteshh@codeaurora.org>,
        Venu Byravarasu <vbyravarasu@nvidia.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Shawn Lin <shawn.lin@rock-chips.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
        Christoph Hellwig <hch@lst.de>,
        Thierry Reding <treding@nvidia.com>,
        Krishna Reddy <vdumpa@nvidia.com>, linux-ext4@vger.kernel.org
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On Thu, Mar 1, 2018 at 12:55 AM, Adrian Hunter <adrian.hunter@intel.com> wr=
ote:
> On 27/02/18 11:28, Adrian Hunter wrote:
>> On 26/02/18 23:48, Dmitry Osipenko wrote:
>>> But still something is wrong... I've been getting occasional EXT4 Ooops=
's, like
>>> the one below, and __wait_on_bit() is always figuring in the stacktrace=
. It
>>> never happened with blk-mq disabled, though it could be a coincidence a=
nd
>>> actually unrelated to blk-mq patches.
>>
>> I can't think how an IO driver could cause that.

Probably it is not wise to place all your eggs (data) in one basket
(ext4) and diversify to viable alternatives which won't be affected by
UNIX 2038 year date problem, likewise?
< https://metztli.it/blog/index.php/amatl/reiser-nahui/reiser4-filesystem-a=
nd-the-unix
>

>>
>> cc'ing ext4 mailing list for more advice.
>
> + Ted and Andreas
>
>>
>>>
>>>
>>> [ 6625.992337] Unable to handle kernel NULL pointer dereference at virt=
ual
>>> address 0000001c
>>> [ 6625.993004] pgd =3D 00b30c03
>>> [ 6625.993257] [0000001c] *pgd=3D00000000
>>> [ 6625.993594] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
>>> [ 6625.994022] Modules linked in:
>>> [ 6625.994326] CPU: 1 PID: 19355 Comm: dpkg Not tainted
>>> 4.16.0-rc2-next-20180220-00095-ge9c9f5689a84-dirty #2090
>>> [ 6625.995078] Hardware name: NVIDIA Tegra SoC (Flattened Device Tree)
>>> [ 6625.995595] PC is at dx_probe+0x68/0x684
>>> [ 6625.995947] LR is at __wait_on_bit+0xac/0xc8
>>> [ 6625.996307] pc : [<c033b960>]    lr : [<c0bfbfd4>]    psr: 800f0013
>>> [ 6625.996806] sp : d55e3df0  ip : c0170e88  fp : d55e3e44
>>> [ 6625.997227] r10: d55e3f4c  r9 : d55e3e70  r8 : 00000000
>>> [ 6625.997650] r7 : c4e13240  r6 : 00000000  r5 : d657db18  r4 : d55e3e=
8c
>>> [ 6625.998165] r3 : 0000007b  r2 : d5830800  r1 : d5831000  r0 : c4e132=
40
>>> [ 6625.998686] Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Seg=
ment none
>>> [ 6625.999246] Control: 10c5387d  Table: 0a63004a  DAC: 00000051
>>> [ 6625.999710] Process dpkg (pid: 19355, stack limit =3D 0x139a48b6)
>>> [ 6626.000184] Stack: (0xd55e3df0 to 0xd55e4000)
>>> [ 6626.000560] 3de0:                                     000002e9 d55e3=
e00
>>> c0c01964 c0278c70
>>> [ 6626.001209] 3e00: d55e3e24 014000c0 c04f3580 c0c01958 d55e3e90 801a0=
01a
>>> d55e3e3c 00000012
>>> [ 6626.001854] 3e20: d5830800 00000000 d657db18 c24b0000 d55e3e70 d55e3=
f4c
>>> d55e3edc d55e3e48
>>> [ 6626.002502] 3e40: c033d568 c033b904 00000000 600f0013 c029e640 d6cf3=
540
>>> ffffe000 00000000
>>> [ 6626.003150] 3e60: 00076e99 d55e3ef4 d55e3e8c d5830800 d409c440 d409c=
454
>>> 00000012 c029e640
>>> [ 6626.003795] 3e80: d55e3ec4 d55e3e90 c02797b4 c4e13240 00000000 00000=
000
>>> 00000000 00000000
>>> [ 6626.004442] 3ea0: 00000000 00000000 00000000 00000000 d409c428 d409c=
428
>>> d657db18 d409c428
>>> [ 6626.005088] 3ec0: 00000000 c24b0000 ffffff9c d55e3f4c d55e3f14 d55e3=
ee0
>>> c033d7b0 c033d1b8
>>> [ 6626.005732] 3ee0: c0c01964 c0180050 d55e3f14 d55e3ef8 c029e870 00000=
000
>>> d409c428 d6546558
>>> [ 6626.006382] 3f00: d55e3f58 00000000 d55e3f34 d55e3f18 c0291f04 c033d=
764
>>> 00000000 00000001
>>> [ 6626.007032] 3f20: 00000000 d55e3f58 d55e3f94 d55e3f38 c0293d70 c0291=
ea0
>>> d55e3f58 d55e3f4c
>>> [ 6626.007679] 3f40: 00000000 0090abb0 d5467800 00000000 d6dd0110 d6546=
558
>>> f3bc423c 00000012
>>> [ 6626.008326] 3f60: c24b0019 80808080 00000000 015ce1b0 0090abb0 00d8d=
670
>>> 00000028 c01011e4
>>> [ 6626.008971] 3f80: d55e2000 00000000 d55e3fa4 d55e3f98 c0294544 c0293=
c44
>>> 00000000 d55e3fa8
>>> [ 6626.009620] 3fa0: c0101000 c0294530 015ce1b0 0090abb0 0090abb0 00000=
2a8
>>> 7d5a8800 7d5a8800
>>> [ 6626.010264] 3fc0: 015ce1b0 0090abb0 00d8d670 00000028 0048eb80 00487=
344
>>> 015eb160 004a6c10
>>> [ 6626.010912] 3fe0: 004a6c8c bede3c0c 0048149d b6ecc6b8 600f0030 0090a=
bb0
>>> 00000000 00000000
>>> [ 6626.011577] [<c033b960>] (dx_probe) from [<c033d568>]
>>> (ext4_find_entry+0x3bc/0x5ac)
>>> [ 6626.012198] [<c033d568>] (ext4_find_entry) from [<c033d7b0>]
>>> (ext4_lookup+0x58/0x1f4)
>>> [ 6626.012844] [<c033d7b0>] (ext4_lookup) from [<c0291f04>]
>>> (__lookup_hash+0x70/0x9c)
>>> [ 6626.013468] [<c0291f04>] (__lookup_hash) from [<c0293d70>] (do_rmdir=
+0x138/0x1b8)
>>> [ 6626.014071] [<c0293d70>] (do_rmdir) from [<c0294544>] (SyS_rmdir+0x2=
0/0x24)
>>> [ 6626.014642] [<c0294544>] (SyS_rmdir) from [<c0101000>]
>>> (ret_fast_syscall+0x0/0x54)
>>> [ 6626.015231] Exception stack(0xd55e3fa8 to 0xd55e3ff0)
>>> [ 6626.015656] 3fa0:                   015ce1b0 0090abb0 0090abb0 00000=
2a8
>>> 7d5a8800 7d5a8800
>>> [ 6626.016302] 3fc0: 015ce1b0 0090abb0 00d8d670 00000028 0048eb80 00487=
344
>>> 015eb160 004a6c10
>>> [ 6626.035930] 3fe0: 004a6c8c bede3c0c 0048149d b6ecc6b8
>>> [ 6626.055341] Code: e1a07000 e5840000 8a000078 e590601c (e5d6301c)
>>> [ 6626.075632] ---[ end trace 034f3552437a92bc ]---
>>>
>>
>>
>

 Sorry if I intrude but just my 2=C2=A2.


Best Professional Regards.

--=20
Jose R R
http://metztli.it
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