[Ocfs2-devel] OCFS2 BUG with 2 different kernels
Daniel Sobe
daniel.sobe at nxp.com
Thu Jul 19 05:36:56 PDT 2018
Hi Larry,
I was not aware that I can pick between 2 alternatives 😲
I'm probably using o2cb because I start the cluster with "/etc/init.d/o2cb enable && /etc/init.d/o2cb start".
I'll need to learn how to use dlm to check whether the crash happens with that one as well.
Regards,
Daniel
-----Original Message-----
From: Larry Chen [mailto:lchen at suse.com]
Sent: Mittwoch, 18. Juli 2018 10:09
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,
Which stack do you use? dlm or o2cb??
I tried to reproduce the bug.
I have set up 2 virtual machines that share one block device(as a qcow2 file on host). And I was using dlm stack instead of o2cb. Kernel version is 4.12.14. I clone linux kernel tree from github and execute the following shell script.
#! /bin/bash
for i in $(git tag)
do
echo $i
git checkout $i
done
Bug could not be reproduced.
According to the back trace, I think the bug is caused by the logic of holding a lock.
If possible, I think the bug will recur, even without drdb, lvm or other components.
Regards,
Larry
On 07/17/2018 04:11 PM, Daniel Sobe wrote:
> Hi Larry,
>
> I think that with the most recent crash, I have a pretty simple environment already. All it takes is an OCFS2 formatted /home volume and a GIT repository on that volume, which generates a lot of disk IO upon "git checkout" to switch branches. VMs or containers are no longer involved.
>
> The only additional simplification that I can think of are the layers on top of the SSD. Currently I have:
>
> SSD partition --> LVM2 --> LVM volumes --> DRBD --> OCFS2
>
> I can easily remove the DRBD layer. Removing LVM will be more difficult, but possible. Do you think any of these make sense to try?
>
> Regards,
>
> Daniel
>
>
> -----Original Message-----
> From: Larry Chen [mailto:lchen at suse.com]
> Sent: Dienstag, 17. Juli 2018 04:54
> 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,
>
> Could you please simplify your environment?
> Can I use several virtual machines to reproduce the bug??
>
> Thanks
> Larry
>
> On 07/16/2018 07:49 PM, Daniel Sobe wrote:
>> Hi,
>>
>> the same issue happens with 4.17.6 kernel from Debian unstable.
>>
>> This time no namespaces were involved, so it is now confirmed that the issue is not related to namespaces, containers and such.
>>
>> All I did was to again run "git checkout" on a git repository that is placed on an OCFS2 volume.
>>
>> After the issue occurs, I have ~ 2 mins before the system becomes unusable. Anything I can do during that time to aid debugging? I don't know what else to try to help fix this issue.
>>
>> Regards,
>>
>> Daniel
>>
>>
>> Jul 16 13:40:24 drs1p002 kernel: ------------[ cut here ]------------
>> Jul 16 13:40:24 drs1p002 kernel: kernel BUG at /build/linux-fVnMBb/linux-4.17.6/fs/ocfs2/dlmglue.c:848!
>> Jul 16 13:40:24 drs1p002 kernel: invalid opcode: 0000 [#1] SMP PTI
>> Jul
>> 16 13:40:24 drs1p002 kernel: Modules linked in: tcp_diag inet_diag
>> unix_diag ocfs2 quota_tree ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm
>> ocfs2_nodemanager oc Jul 16 13:40:24 drs1p002 kernel: jbd2
>> crc32c_generic fscrypto ecb crypto_simd cryptd glue_helper aes_x86_64
>> dm_mod sr_mod cdrom sd_mod i2c_i801 ahci libahci Jul 16 13:40:24
>> drs1p002 kernel: CPU: 1 PID: 22459 Comm: git Not tainted
>> 4.17.0-1-amd64 #1 Debian 4.17.6-1 Jul 16 13:40:24 drs1p002 kernel:
>> Hardware name: Dell Inc. OptiPlex 7010/0WR7PY, BIOS A18 04/30/2014
>> Jul
>> 16 13:40:24 drs1p002 kernel: RIP:
>> 0010:__ocfs2_cluster_unlock.isra.39+0x9c/0xb0 [ocfs2] Jul 16 13:40:24
>> drs1p002 kernel: RSP: 0018:ffff9e57887dfaf8 EFLAGS: 00010046 Jul 16
>> 13:40:24 drs1p002 kernel: RAX: 0000000000000292 RBX: ffff92559ee9f018
>> RCX: 00000000000501e7 Jul 16 13:40:24 drs1p002 kernel: RDX:
>> 0000000000000000 RSI: ffff92559ee9f018 RDI: ffff92559ee9f094 Jul 16
>> 13:40:24 drs1p002 kernel: RBP: ffff92559ee9f094 R08: 0000000000000000 R09: 0000000000008763 Jul 16 13:40:24 drs1p002 kernel: R10: ffff9e57887dfae0 R11: 0000000000000010 R12: 0000000000000003 Jul 16 13:40:24 drs1p002 kernel: R13: ffff9256127d6000 R14: 0000000000000000 R15: ffffffffc0d35200 Jul 16 13:40:24 drs1p002 kernel: FS: 00007f0ce8ff9700(0000) GS:ffff92561e280000(0000) knlGS:0000000000000000 Jul 16 13:40:24 drs1p002 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Jul 16 13:40:24 drs1p002 kernel: CR2: 00007f0cac000010 CR3: 000000009ef52006 CR4: 00000000001606e0 Jul 16 13:40:24 drs1p002 kernel: Call Trace:
>> Jul 16 13:40:24 drs1p002 kernel: ? ocfs2_dentry_unlock+0x35/0x80
>> [ocfs2] Jul 16 13:40:24 drs1p002 kernel:
>> ocfs2_dentry_attach_lock+0x245/0x420 [ocfs2] Jul 16 13:40:24 drs1p002
>> kernel: ? d_splice_alias+0x2a5/0x410 Jul 16 13:40:24 drs1p002 kernel:
>> ocfs2_lookup+0x233/0x2c0 [ocfs2] Jul 16 13:40:24 drs1p002 kernel:
>> __lookup_slow+0x97/0x150 Jul 16 13:40:24 drs1p002 kernel:
>> lookup_slow+0x35/0x50 Jul 16 13:40:24 drs1p002 kernel:
>> walk_component+0x1c4/0x470 Jul 16 13:40:24 drs1p002 kernel: ?
>> link_path_walk+0x27c/0x510 Jul 16 13:40:24 drs1p002 kernel: ?
>> ktime_get+0x3e/0xa0 Jul 16 13:40:24 drs1p002 kernel:
>> path_lookupat+0x84/0x1f0 Jul 16 13:40:24 drs1p002 kernel:
>> filename_lookup+0xb6/0x190 Jul 16 13:40:24 drs1p002 kernel: ?
>> ocfs2_inode_unlock+0xe4/0xf0 [ocfs2] Jul 16 13:40:24 drs1p002 kernel:
>> ? __check_object_size+0xa7/0x1a0 Jul 16 13:40:24 drs1p002 kernel: ?
>> strncpy_from_user+0x48/0x160 Jul 16 13:40:24 drs1p002 kernel: ?
>> getname_flags+0x6a/0x1e0 Jul 16 13:40:24 drs1p002 kernel: ?
>> vfs_statx+0x73/0xe0 Jul 16 13:40:24 drs1p002 kernel:
>> vfs_statx+0x73/0xe0 Jul 16 13:40:24 drs1p002 kernel:
>> __do_sys_newlstat+0x39/0x70 Jul 16 13:40:24 drs1p002 kernel:
>> do_syscall_64+0x55/0x110 Jul 16 13:40:24 drs1p002 kernel:
>> entry_SYSCALL_64_after_hwframe+0x44/0xa9
>> Jul 16 13:40:24 drs1p002 kernel: RIP: 0033:0x7f0cf43ac995 Jul 16
>> 13:40:24 drs1p002 kernel: RSP: 002b:00007f0ce8ff8cb8 EFLAGS: 00000246
>> ORIG_RAX: 0000000000000006 Jul 16 13:40:24 drs1p002 kernel: RAX:
>> ffffffffffffffda RBX: 00007f0ce8ff8df0 RCX: 00007f0cf43ac995 Jul 16
>> 13:40:24 drs1p002 kernel: RDX: 00007f0ce8ff8ce0 RSI: 00007f0ce8ff8ce0
>> RDI: 00007f0cb0000b20 Jul 16 13:40:24 drs1p002 kernel: RBP:
>> 0000000000000017 R08: 0000000000000003 R09: 0000000000000000 Jul 16
>> 13:40:24 drs1p002 kernel: R10: 0000000000000000 R11: 0000000000000246
>> R12: 00007f0ce8ff8dc4 Jul 16 13:40:24 drs1p002 kernel: R13:
>> 0000000000000008 R14: 00005573fd0aa758 R15: 0000000000000005 Jul 16
>> 13:40:24 drs1p002 kernel: Code: 48 89 ef 48 89 c6 5b 5d 41 5c 41 5d
>> e9 2e 3c a6 dc 8b 53 68 85 d2 74 13 83 ea 01 89 53 68 eb b1 8b 53 6c
>> 85
>> d2 74 c5 e Jul 16 13:40:24 drs1p002 kernel: RIP:
>> __ocfs2_cluster_unlock.isra.39+0x9c/0xb0 [ocfs2] RSP:
>> ffff9e57887dfaf8 Jul 16 13:40:24 drs1p002 kernel: ---[ end trace
>> a5a84fa62e77df42 ]---
>>
>> -----Original Message-----
>> From: ocfs2-devel-bounces at oss.oracle.com
>> [mailto:ocfs2-devel-bounces at oss.oracle.com] On Behalf Of Daniel Sobe
>> Sent: Freitag, 13. Juli 2018 13:56
>> To: Larry Chen <lchen at suse.com>; ocfs2-devel at oss.oracle.com
>> Subject: Re: [Ocfs2-devel] OCFS2 BUG with 2 different kernels
>>
>> Hi Larry,
>>
>> I'm running a playground with 3 Dell PCs with Intel CPUs, standard consumer hardware. All 3 disks are SSD and partitioned with LVM. I have added 2 logical volumes on each system, and set up a 3-way replication using DRBD (on a separate local network). I'm still using DRBB 8 as it is shipped with Debian 9. 2 of those PCs are set up for the "stacked primary" volumes, on which I have created the OCFS2 volumes, as cluster of 2 nodes, using the same private network as DRDB does. Heartbeat is local (I guess since I did not change the default and did not do anything explicitly).
>>
>> Again I was using a LXC container for remote X via X2go. Inside the X session I opened a terminal and was compiling some code with "make -j" on my OCFS2 home directory. The next crash I reported was while doing "git checkout", triggering a lot of change in workspace files.
>>
>> Next I will be using kernel 4.17.6 now as it was recently packed for Debian unstable. Additionally I will work on the PC directly, to exclude that the issue is related to namespaces, control groups and what else that is only present in a container.
>>
>> Regards,
>>
>> Daniel
>>
>> -----Original Message-----
>> From: Larry Chen [mailto:lchen at suse.com]
>> Sent: Freitag, 13. Juli 2018 11:49
>> 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 effort to reproduce the bug.
>> I can confirm that there exist more than one bug.
>> I'll focus on this interesting issue.
>>
>>
>> On 07/12/2018 10:24 PM, Daniel Sobe wrote:
>>> 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]
>>
>> Here is caused by ocfs2_dentry_lock failed.
>> I'll fix it by prevent ocfs2 from calling ocfs2_dentry_unlock on the failure of ocfs2_dentry_lock.
>>
>> But why it failed still confuses me.
>>
>>
>>> 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://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefense.proofpoint.com%2Fv2%2Furl%3Fu%3Dhttps-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%26d%3DDwIGaQ%26c%3DRoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE%26r%3DC7gAd4uDxlAvTdc0vmU6X8CMk6L2iDY8-HD0qT6Fo7Y%26m%3DVTW6gNWhTVlF5KmjZv2fMhm45jgdtPllvAbYDQ0PNYA%26s%3DtGYkPHaAU3tSeeEGrlORRLY9rDQAl6YdYtD0RJ7HBHw%26e&data=02%7C01%7Cdaniel.sobe%40nxp.com%7C9befd428db39400d656308d5e8b7b97d%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C636670798149970770&sdata=DPJ%2BOixL7cb5fRv3whA2NOpvGtq%2BzQ9il4m2gk7MXgo%3D&reserved=0=) 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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