[Ocfs2-devel] OCFS2 BUG with 2 different kernels
Daniel Sobe
daniel.sobe at nxp.com
Thu Jul 12 07:24:02 PDT 2018
Hi Larry,
sorry for not responding any earlier. It took me quite a while to reproduce the issue on a "playground" installation. Here's todays kernel BUG log:
Jul 12 15:29:08 drs1p001 kernel: [1300619.423826] ------------[ cut here ]------------
Jul 12 15:29:08 drs1p001 kernel: [1300619.423827] kernel BUG at /build/linux-6BBPzq/linux-4.16.5/fs/ocfs2/dlmglue.c:848!
Jul 12 15:29:08 drs1p001 kernel: [1300619.423835] invalid opcode: 0000 [#1] SMP PTI
Jul 12 15:29:08 drs1p001 kernel: [1300619.423836] Modules linked in: btrfs zstd_compress zstd_decompress xxhash xor raid6_pq ufs qnx4 hfsplus hfs minix ntfs vfat msdos fat jfs xfs tcp_diag inet_diag unix_diag appletalk ax25 ipx(C) p8023 p8022 psnap veth ocfs2 quota_tree ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm ocfs2_nodemanager ocfs2_stackglue configfs bridge stp llc iptable_filter fuse snd_hda_codec_hdmi rfkill intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel snd_hda_codec_realtek snd_hda_codec_generic kvm snd_hda_intel dell_wmi dell_smbios sparse_keymap irqbypass snd_hda_codec wmi_bmof dell_wmi_descriptor crct10dif_pclmul evdev crc32_pclmul i915 dcdbas snd_hda_core ghash_clmulni_intel intel_cstate snd_hwdep drm_kms_helper snd_pcm intel_uncore intel_rapl_perf snd_timer drm snd serio_raw pcspkr mei_me iTCO_wdt i2c_algo_bit
Jul 12 15:29:08 drs1p001 kernel: [1300619.423870] soundcore iTCO_vendor_support mei shpchp sg intel_pch_thermal wmi video acpi_pad button drbd lru_cache libcrc32c ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 crc32c_generic fscrypto ecb dm_mod sr_mod cdrom sd_mod crc32c_intel aesni_intel aes_x86_64 crypto_simd cryptd glue_helper psmouse ahci libahci xhci_pci libata e1000e xhci_hcd i2c_i801 e1000 scsi_mod usbcore usb_common fan thermal [last unloaded: configfs]
Jul 12 15:29:08 drs1p001 kernel: [1300619.423892] CPU: 2 PID: 13603 Comm: cc1 Tainted: G C 4.16.0-0.bpo.1-amd64 #1 Debian 4.16.5-1~bpo9+1
Jul 12 15:29:08 drs1p001 kernel: [1300619.423894] Hardware name: Dell Inc. OptiPlex 5040/0R790T, BIOS 1.2.7 01/15/2016
Jul 12 15:29:08 drs1p001 kernel: [1300619.423923] RIP: 0010:__ocfs2_cluster_unlock.isra.36+0x9d/0xb0 [ocfs2]
Jul 12 15:29:08 drs1p001 kernel: [1300619.423925] RSP: 0018:ffffb14b4a133b10 EFLAGS: 00010046
Jul 12 15:29:08 drs1p001 kernel: [1300619.423927] RAX: 0000000000000282 RBX: ffff9d269d990018 RCX: 0000000000000000
Jul 12 15:29:08 drs1p001 kernel: [1300619.423929] RDX: 0000000000000000 RSI: ffff9d269d990018 RDI: ffff9d269d990094
Jul 12 15:29:08 drs1p001 kernel: [1300619.423931] RBP: 0000000000000003 R08: 000062d940000000 R09: 000000000000036a
Jul 12 15:29:08 drs1p001 kernel: [1300619.423933] R10: ffffb14b4a133af8 R11: 0000000000000068 R12: ffff9d269d990094
Jul 12 15:29:08 drs1p001 kernel: [1300619.423934] R13: ffff9d2882baa000 R14: 0000000000000000 R15: ffffffffc0bf3940
Jul 12 15:29:08 drs1p001 kernel: [1300619.423936] FS: 0000000000000000(0000) GS:ffff9d2899d00000(0063) knlGS:00000000f7c99d00
Jul 12 15:29:08 drs1p001 kernel: [1300619.423938] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
Jul 12 15:29:08 drs1p001 kernel: [1300619.423940] CR2: 00007ff9c7f3e8dc CR3: 00000001725f0002 CR4: 00000000003606e0
Jul 12 15:29:08 drs1p001 kernel: [1300619.423942] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Jul 12 15:29:08 drs1p001 kernel: [1300619.423944] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Jul 12 15:29:08 drs1p001 kernel: [1300619.423945] Call Trace:
Jul 12 15:29:08 drs1p001 kernel: [1300619.423958] ? ocfs2_dentry_unlock+0x35/0x80 [ocfs2]
Jul 12 15:29:08 drs1p001 kernel: [1300619.423969] ocfs2_dentry_attach_lock+0x2cb/0x420 [ocfs2]
Jul 12 15:29:08 drs1p001 kernel: [1300619.423981] ocfs2_lookup+0x199/0x2e0 [ocfs2]
Jul 12 15:29:08 drs1p001 kernel: [1300619.423986] ? _cond_resched+0x16/0x40
Jul 12 15:29:08 drs1p001 kernel: [1300619.423989] lookup_slow+0xa9/0x170
Jul 12 15:29:08 drs1p001 kernel: [1300619.423991] walk_component+0x1c6/0x350
Jul 12 15:29:08 drs1p001 kernel: [1300619.423993] ? path_init+0x1bd/0x300
Jul 12 15:29:08 drs1p001 kernel: [1300619.423995] path_lookupat+0x73/0x220
Jul 12 15:29:08 drs1p001 kernel: [1300619.423998] ? ___bpf_prog_run+0xba7/0x1260
Jul 12 15:29:08 drs1p001 kernel: [1300619.424000] filename_lookup+0xb8/0x1a0
Jul 12 15:29:08 drs1p001 kernel: [1300619.424003] ? seccomp_run_filters+0x58/0xb0
Jul 12 15:29:08 drs1p001 kernel: [1300619.424005] ? __check_object_size+0x98/0x1a0
Jul 12 15:29:08 drs1p001 kernel: [1300619.424008] ? strncpy_from_user+0x48/0x160
Jul 12 15:29:08 drs1p001 kernel: [1300619.424010] ? vfs_statx+0x73/0xe0
Jul 12 15:29:08 drs1p001 kernel: [1300619.424012] vfs_statx+0x73/0xe0
Jul 12 15:29:08 drs1p001 kernel: [1300619.424015] C_SYSC_x86_stat64+0x39/0x70
Jul 12 15:29:08 drs1p001 kernel: [1300619.424018] ? syscall_trace_enter+0x117/0x2c0
Jul 12 15:29:08 drs1p001 kernel: [1300619.424020] do_fast_syscall_32+0xab/0x1f0
Jul 12 15:29:08 drs1p001 kernel: [1300619.424022] entry_SYSENTER_compat+0x7f/0x8e
Jul 12 15:29:08 drs1p001 kernel: [1300619.424025] Code: 89 c6 5b 5d 41 5c 41 5d e9 a1 77 78 db 0f 0b 8b 53 68 85 d2 74 15 83 ea 01 89 53 68 eb af 8b 53 6c 85 d2 74 c3 eb d1 0f 0b 0f 0b <0f> 0b 0f 0b 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f
Jul 12 15:29:08 drs1p001 kernel: [1300619.424055] RIP: __ocfs2_cluster_unlock.isra.36+0x9d/0xb0 [ocfs2] RSP: ffffb14b4a133b10
Jul 12 15:29:08 drs1p001 kernel: [1300619.424057] ---[ end trace aea789961795b75f ]---
Jul 12 15:29:08 drs1p001 kernel: [1300628.967649] ------------[ cut here ]------------
As this occurred while compiling C code with "-j" I think we were on the wrong track, it is not about mount sharing, but rather a multicore issue. That would be in line with the other report that I found (I referenced it when I was reporting my issue), who claimed the issue went away after he restricted to 1 active CPU core.
Unfortunately I could not do much with the machine afterwards. Probably the OCFS2 mechanism to reboot the node if the local heartbeat isn't updated anymore kicked in, so there was no way I could have SSHed in and run some debugging.
I have now updated to the kernel Debian package of 4.16.16 backported for Debian 9. I guess I will hit the bug again and let you know.
Regards,
Daniel
-----Original Message-----
From: Larry Chen [mailto:lchen at suse.com]
Sent: Freitag, 11. Mai 2018 09:01
To: Daniel Sobe <daniel.sobe at nxp.com>; ocfs2-devel at oss.oracle.com
Subject: Re: [Ocfs2-devel] OCFS2 BUG with 2 different kernels
Hi Daniel,
On 04/12/2018 08:20 PM, Daniel Sobe wrote:
> Hi Larry,
>
> this is, in a nutshell, what I do to create a LXC container as "ordinary user":
>
> * Install the LXC packages from the distribution
> * run the command "lxc-create -n test1 -t download"
> ** first run might prompt you to generate a ~/.config/lxc/default.conf
> to define UID mappings
> ** in a corporate environment it might be tricky to set the http_proxy
> (and maybe even https_proxy) environment variables correctly
> ** once the list of images is shown, select for instance "debian" "jessie" "amd64"
> * the container downloads to ~/.local/share/lxc/
> * adapt the "config" file in that directory to add the shared ocfs2
> mount like in my example below
> * if you're lucky, then "lxc-start -d -n test1" already works, which you can confirm by "lxc-ls --fancy", and attach to the container with "lxc-attach -n test1"
> ** if you want to finally enable networking, most distributions
> arrange a dedicated bridge (lxcbr0) which you can configure similar to
> my example below
> ** in my case I had to install cgroup related tools and reboot to have
> all cgroups available, and to allow use of lxcbr0 bridge in
> /etc/lxc/lxc-usernet
>
> Now if you access the mount-shared OCFS2 file system from with several containers, the bug will (hopefully) trigger on your side as well. I don't know the conditions under which this will occur, unfortunately.
>
> Regards,
>
> Daniel
>
>
> -----Original Message-----
> From: Larry Chen [mailto:lchen at suse.com]
> Sent: Donnerstag, 12. April 2018 11:20
> To: Daniel Sobe <daniel.sobe at nxp.com>
> Subject: Re: [Ocfs2-devel] OCFS2 BUG with 2 different kernels
>
> Hi Daniel,
>
> Quite an interesting issue.
>
> I'm not familiar with lxc tools, so it may take some time to reproduce it.
>
> Do you have a script to build up your lxc environment?
> Because I want to make sure that my environment is quite the same as yours.
>
> Thanks,
> Larry
>
>
> On 04/12/2018 03:45 PM, Daniel Sobe wrote:
>> Hi Larry,
>>
>> not sure if it helps, the issue wasn't there with Debian 8 and kernel
>> 3.16 - but that's a long history. Unfortunately, the only machine
>> where I could try to bisect, does not run any kernel < 4.16 without
>> other issues ☹
>>
>> Regards,
>>
>> Daniel
>>
>>
>> -----Original Message-----
>> From: Larry Chen [mailto:lchen at suse.com]
>> Sent: Donnerstag, 12. April 2018 05:17
>> To: Daniel Sobe <daniel.sobe at nxp.com>; ocfs2-devel at oss.oracle.com
>> Subject: Re: [Ocfs2-devel] OCFS2 BUG with 2 different kernels
>>
>> Hi Daniel,
>>
>> Thanks for your report.
>> I'll try to reproduce this bug as you did.
>>
>> I'm afraid there may be some bugs on the collaboration of cgroups and ocfs2.
>>
>> Thanks
>> Larry
>>
>>
>> On 04/11/2018 08:24 PM, Daniel Sobe wrote:
>>> Hi Larry,
>>>
>>> below is an example config file like I use it for LXC containers. I followed the instructions (https://urldefense.proofpoint.com/v2/url?u=https-3A__emea01.safelinks.protection.outlook.com_-3Furl-3Dhttps-253A-252F-252Fwiki.debian.org-252FLXC-26data-3D02-257C01-257Cdaniel.sobe-2540nxp.com-257C11fd4f062e694faa287a08d5a023f22b-257C686ea1d3bc2b4c6fa92cd99c5c301635-257C0-257C0-257C636590998614059943-26sdata-3DZSqSTx3Vjxy-252FbfKrXdIVGvUqieRFxVl4FFnr-252FPTGAhc-253D-26reserved-3D0&d=DwIGaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=C7gAd4uDxlAvTdc0vmU6X8CMk6L2iDY8-HD0qT6Fo7Y&m=d8YTOI365uammRcpTuXDoQhwuGDm0CyQ-QNJxQAZczs&s=crzdJkF_u3rBf8xZ1cHEce1LBwHIrVIDads0aP6CP74&e=) and downloaded a Debian 8 container as user (unprivileged) and adapted the config file. Several of those containers run on one host and share the OCFS2 directory as you can see at the "lxc.mount.entry" line.
>>>
>>> Meanwhile I'm trying whether the problem can be reproduced with shared mounts in one namespace, as you suggested. So far with no success, will report once anything happens.
>>>
>>> Regards,
>>>
>>> Daniel
>>>
>>> ----
>>>
>>> # Distribution configuration
>>> lxc.include = /usr/share/lxc/config/debian.common.conf
>>> lxc.include = /usr/share/lxc/config/debian.userns.conf
>>> lxc.arch = x86_64
>>>
>>> # Container specific configuration
>>> lxc.id_map = u 0 624288 65536
>>> lxc.id_map = g 0 624288 65536
>>>
>>> lxc.utsname = container1
>>> lxc.rootfs = /storage/uvirtuals/unpriv/container1/rootfs
>>>
>>> lxc.network.type = veth
>>> lxc.network.flags = up
>>> lxc.network.link = bridge1
>>> lxc.network.name = eth0
>>> lxc.network.veth.pair = aabbccddeeff
>>> lxc.network.ipv4 = XX.XX.XX.XX/YY
>>> lxc.network.ipv4.gateway = ZZ.ZZ.ZZ.ZZ
>>>
>>> lxc.cgroup.cpuset.cpus = 63-86
>>>
>>> lxc.mount.entry = /storage/ocfs2/sw sw none bind 0 0
>>>
>>> lxc.cgroup.memory.limit_in_bytes = 240G
>>> lxc.cgroup.memory.memsw.limit_in_bytes = 240G
>>>
>>> lxc.include = /usr/share/lxc/config/common.conf.d/00-lxcfs.conf
>>>
>>> ----
>>>
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: Larry Chen [mailto:lchen at suse.com]
>>> Sent: Mittwoch, 11. April 2018 13:31
>>> To: Daniel Sobe <daniel.sobe at nxp.com>; ocfs2-devel at oss.oracle.com
>>> Subject: Re: [Ocfs2-devel] OCFS2 BUG with 2 different kernels
>>>
>>>
>>>
>>> On 04/11/2018 07:17 PM, Daniel Sobe wrote:
>>>> Hi Larry,
>>>>
>>>> this is what I was doing. The 2nd node, while being "declared" in the cluster.conf, does not exist yet, and thus everything was happening on one node only.
>>>>
>>>> I do not know in detail how LXC does the mount sharing, but I assume it simply calls "mount --bind /original/mount/point /new/mount/point" in a separate namespace (or, somehow unshares the mount from the original namespace afterwards).
>>> I thought of there is a way to share a directory between host and docker container, like
>>> docker run -v /host/directory:/container/directory -other -options image_name command_to_run That's different from yours.
>>>
>>> How did you setup your lxc or container?
>>>
>>> If you could, show me the procedure, I'll try to reproduce it.
>>>
>>> And by the way, if you get rid of lxc, and just mount ocfs2 on several different mount point of local host, will the problem recur?
>>>
>>> Regards,
>>> Larry
>>>> Regards,
>>>>
>>>> Daniel
>>>>
Sorry for this delayed reply.
I tried with lxc + ocfs2 in your mount-shared way.
But I can not reproduce your bugs.
What I use is opensuse tumbleweed.
The procedure I try to reproduce your bugs:
0. set-up ha cluster stack and mount ocfs2 fs on host's /mnt with command
mount /dev/xxx /mnt
then it shows
207 65 254:16 / /mnt rw,relatime shared:94
I think this *shared* is what you want. And this mount point will be shared within multiple namespaces.
1. Start Virtual Machine Manager.
2. add a local LXC connection by clicking File › Add Connection.
Select LXC (Linux Containers) as the hypervisor and click Connect.
3. Select the localhost (LXC) connection and click File New Virtual Machine menu.
4. Activate Application container and click Forward.
Set the path to the application to be launched. As an example, the field is filled with /bin/sh, which is fine to create a first container.
Click Forward.
5. Choose the maximum amount of memory and CPUs to allocate to the container. Click Forward.
6. Type in a name for the container. This name will be used for all virsh commands on the container.
Click Advanced options. Select the network to connect the container to and click Finish. The container will be created and started. A console will be opened automatically.
If possible, could you please provide a shell script to show what you did with you mount point.
Thanks
Larry
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