[Gluster-users] Gluster Periodic Brick Process Deaths
Xavi Hernandez
jahernan at redhat.com
Mon Jan 13 11:20:29 UTC 2020
Hi Ben,
we already identified the issue that caused crashes when gluster ports were
scanned. The fix is present on 6.7 and 7.1, so if this was the reason for
your problem, those versions should help.
Best regards,
Xavi
On Mon, Jan 13, 2020 at 11:57 AM Ben Tasker <btasker at swiftserve.com> wrote:
> Hi,
>
> Just an update on this - we made our ACLs much, much stricter around
> gluster ports and to my knowledge haven't seen a brick death since.
>
> Ben
>
> On Wed, Dec 11, 2019 at 12:43 PM Ben Tasker <btasker at swiftserve.com>
> wrote:
>
>> Hi Xavi,
>>
>> We don't that I'm explicitly aware of, *but* I can't rule it out as a
>> probability as it's possible some of our partners do (some/most certainly
>> have scans done as part of pentests fairly regularly).
>>
>> But, that does at least give me an avenue to pursue in the meantime,
>> thanks!
>>
>> Ben
>>
>> On Wed, Dec 11, 2019 at 12:16 PM Xavi Hernandez <jahernan at redhat.com>
>> wrote:
>>
>>> Hi Ben,
>>>
>>> I've recently seen some issues that seem similar to yours (based on the
>>> stack trace in the logs). Right now it seems that in these cases the
>>> problem is caused by some port scanning tool that triggers an unhandled
>>> condition. We are still investigating what is causing this to fix it as
>>> soon as possible.
>>>
>>> Do you have one of these tools on your network ?
>>>
>>> Regards,
>>>
>>> Xavi
>>>
>>> On Tue, Dec 10, 2019 at 7:53 PM Ben Tasker <btasker at swiftserve.com>
>>> wrote:
>>>
>>>> Hi,
>>>>
>>>> A little while ago we had an issue with Gluster 6. As it was urgent we
>>>> downgraded to Gluster 5.9 and it went away.
>>>>
>>>> Some boxes are now running 5.10 and the issue has come back.
>>>>
>>>> From the operators point of view, the first you know about this is
>>>> getting reports that the transport endpoint is not connected:
>>>>
>>>> OSError: [Errno 107] Transport endpoint is not connected: '/shared/lfd/benfusetestlfd'
>>>>
>>>>
>>>> If we check, we can see that the brick process has died
>>>>
>>>> # gluster volume status
>>>> Status of volume: shared
>>>> Gluster process TCP Port RDMA Port Online Pid
>>>> ------------------------------------------------------------------------------
>>>> Brick fa01.gl:/data1/gluster N/A N/A N N/A
>>>> Brick fa02.gl:/data1/gluster N/A N/A N N/A
>>>> Brick fa01.gl:/data2/gluster 49153 0 Y 14136
>>>> Brick fa02.gl:/data2/gluster 49153 0 Y 14154
>>>> NFS Server on localhost N/A N/A N N/A
>>>> Self-heal Daemon on localhost N/A N/A Y 186193
>>>> NFS Server on fa01.gl N/A N/A N N/A
>>>> Self-heal Daemon on fa01.gl N/A N/A Y 6723
>>>>
>>>>
>>>> Looking in the brick logs, we can see that the process crashed, and we
>>>> get a backtrace (of sorts)
>>>>
>>>> >gen=110, slot->fd=17
>>>> pending frames:
>>>> patchset: git://git.gluster.org/glusterfs.git
>>>> signal received: 11
>>>> time of crash:
>>>> 2019-07-04 09:42:43
>>>> configuration details:
>>>> argp 1
>>>> backtrace 1
>>>> dlfcn 1
>>>> libpthread 1
>>>> llistxattr 1
>>>> setfsid 1
>>>> spinlock 1
>>>> epoll.h 1
>>>> xattr.h 1
>>>> st_atim.tv_nsec 1
>>>> package-string: glusterfs 6.1
>>>> /lib64/libglusterfs.so.0(+0x26db0)[0x7f79984eadb0]
>>>> /lib64/libglusterfs.so.0(gf_print_trace+0x334)[0x7f79984f57b4]
>>>> /lib64/libc.so.6(+0x36280)[0x7f7996b2a280]
>>>> /usr/lib64/glusterfs/6.1/rpc-transport/socket.so(+0xa4cc)[0x7f798c8af4cc]
>>>> /lib64/libglusterfs.so.0(+0x8c286)[0x7f7998550286]
>>>> /lib64/libpthread.so.0(+0x7dd5)[0x7f799732add5]
>>>> /lib64/libc.so.6(clone+0x6d)[0x7f7996bf1ead]
>>>>
>>>>
>>>> Other than that, there's not a lot in the logs. In syslog we can see
>>>> the client (Gluster's FS is mounted on the boxes) complaining that the
>>>> brick's gone away.
>>>>
>>>> Software versions (for when this was happening with 6):
>>>>
>>>> # rpm -qa | grep glus
>>>> glusterfs-libs-6.1-1.el7.x86_64
>>>> glusterfs-cli-6.1-1.el7.x86_64
>>>> centos-release-gluster6-1.0-1.el7.centos.noarch
>>>> glusterfs-6.1-1.el7.x86_64
>>>> glusterfs-api-6.1-1.el7.x86_64
>>>> glusterfs-server-6.1-1.el7.x86_64
>>>> glusterfs-client-xlators-6.1-1.el7.x86_64
>>>> glusterfs-fuse-6.1-1.el7.x86_64
>>>>
>>>>
>>>> This was happening pretty regularly (uncomfortably so) on boxes running
>>>> Gluster 6. Grepping through the brick logs it's always a segfault or
>>>> sigabrt that leads to brick death
>>>>
>>>> # grep "signal received:" data*
>>>> data1-gluster.log:signal received: 11
>>>> data1-gluster.log:signal received: 6
>>>> data1-gluster.log:signal received: 6
>>>> data1-gluster.log:signal received: 11
>>>> data2-gluster.log:signal received: 6
>>>>
>>>> There's no apparent correlation on times or usage levels that we could
>>>> see. The issue was occurring on a wide array of hardware, spread across the
>>>> globe (but always talking to local - i.e. LAN - peers). All the same, disks
>>>> were checked, RAM checked etc.
>>>>
>>>> Digging through the logs we were able to find the lines just as the
>>>> crash occurs
>>>>
>>>> [2019-07-07 06:37:00.213490] I [MSGID: 108031] [afr-common.c:2547:afr_local_discovery_cbk] 0-shared-replicate-1: selecting local read_child shared-client-2
>>>> [2019-07-07 06:37:03.544248] E [MSGID: 108008] [afr-transaction.c:2877:afr_write_txn_refresh_done] 0-shared-replicate-1: Failing SETATTR on gfid a9565e4b-9148-4969-91e8-ba816aea8f6a: split-brain observed. [Input/output error]
>>>> [2019-07-07 06:37:03.544312] W [MSGID: 0] [dht-inode-write.c:1156:dht_non_mds_setattr_cbk] 0-shared-dht: subvolume shared-replicate-1 returned -1
>>>> [2019-07-07 06:37:03.545317] E [MSGID: 108008] [afr-transaction.c:2877:afr_write_txn_refresh_done] 0-shared-replicate-1: Failing SETATTR on gfid a8dd2910-ff64-4ced-81ef-01852b7094ae: split-brain observed. [Input/output error]
>>>> [2019-07-07 06:37:03.545382] W [fuse-bridge.c:1583:fuse_setattr_cbk] 0-glusterfs-fuse: 2241437: SETATTR() /lfd/benfusetestlfd/_logs => -1 (Input/output error)
>>>>
>>>> But, it's not the first time that had occurred, so may be completely
>>>> unrelated.
>>>>
>>>> When this happens, restarting gluster buys some time. It may just be
>>>> coincidental, but our searches through the logs showed *only* the
>>>> first brick process dying, processes for other bricks (some of the boxes
>>>> have 4) don't appear to be affected by this.
>>>>
>>>> As we had lots and lots of Gluster machines failing across the network,
>>>> at this point we stopped investigating and I came up with a downgrade
>>>> procedure so that we could get production back into a usable state.
>>>> Machines running Gluster 6 were downgraded to Gluster 5.9 and the issue
>>>> just went away. Unfortunately other demands came up, so no-one was able to
>>>> follow up on it.
>>>>
>>>> Tonight though, there's been a brick process fail on a 5.10 machine
>>>> with an all too familiar looking BT
>>>>
>>>> [2019-12-10 17:20:01.708601] I [MSGID: 115029] [server-handshake.c:537:server_setvolume] 0-shared-server: accepted client from CTX_ID:84c0d874-4c60-4a49-80f8-b344f3b376ba-GRAPH_ID:0-PID:33972-HOST:fa02.vn10.swiftserve.com-PC_NAME:shared-client-4-RECON_NO:-0 (version: 5.1
>>>> 0)
>>>> [2019-12-10 17:20:01.745940] I [MSGID: 115036] [server.c:469:server_rpc_notify] 0-shared-server: disconnecting connection from CTX_ID:84c0d874-4c60-4a49-80f8-b344f3b376ba-GRAPH_ID:0-PID:33972-HOST:fa02.vn10.swiftserve.com-PC_NAME:shared-client-4-RECON_NO:-0
>>>> [2019-12-10 17:20:01.746090] I [MSGID: 101055] [client_t.c:435:gf_client_unref] 0-shared-server: Shutting down connection CTX_ID:84c0d874-4c60-4a49-80f8-b344f3b376ba-GRAPH_ID:0-PID:33972-HOST:fa02.vn10.swiftserve.com-PC_NAME:shared-client-4-RECON_NO:-0
>>>> pending frames:
>>>> patchset: git://git.gluster.org/glusterfs.git
>>>> signal received: 11
>>>> time of crash:
>>>> 2019-12-10 17:21:36
>>>> configuration details:
>>>> argp 1
>>>> backtrace 1
>>>> dlfcn 1
>>>> libpthread 1
>>>> llistxattr 1
>>>> setfsid 1
>>>> spinlock 1
>>>> epoll.h 1
>>>> xattr.h 1
>>>> st_atim.tv_nsec 1
>>>> package-string: glusterfs 5.10
>>>> /lib64/libglusterfs.so.0(+0x26650)[0x7f6a1c6f3650]
>>>> /lib64/libglusterfs.so.0(gf_print_trace+0x334)[0x7f6a1c6fdc04]
>>>> /lib64/libc.so.6(+0x363b0)[0x7f6a1ad543b0]
>>>> /usr/lib64/glusterfs/5.10/rpc-transport/socket.so(+0x9e3b)[0x7f6a112dae3b]
>>>> /lib64/libglusterfs.so.0(+0x8aab9)[0x7f6a1c757ab9]
>>>> /lib64/libpthread.so.0(+0x7e65)[0x7f6a1b556e65]
>>>> /lib64/libc.so.6(clone+0x6d)[0x7f6a1ae1c88d]
>>>> ---------
>>>>
>>>>
>>>> Versions this time are
>>>>
>>>> # rpm -qa | grep glus
>>>> glusterfs-server-5.10-1.el7.x86_64
>>>> centos-release-gluster5-1.0-1.el7.centos.noarch
>>>> glusterfs-fuse-5.10-1.el7.x86_64
>>>> glusterfs-libs-5.10-1.el7.x86_64
>>>> glusterfs-client-xlators-5.10-1.el7.x86_64
>>>> glusterfs-api-5.10-1.el7.x86_64
>>>> glusterfs-5.10-1.el7.x86_64
>>>> glusterfs-cli-5.10-1.el7.x86_64
>>>>
>>>>
>>>> These boxes have been running 5.10 for less than 48 hours
>>>>
>>>> Has anyone else run into this? Assuming the root is the same (it's a
>>>> fairly limited BT, so hard to say for sure), was something from 6
>>>> backported into 5.10?
>>>>
>>>> Thanks
>>>>
>>>> Ben
>>>> ________
>>>>
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>>>>
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>>>>
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>>>>
>>>
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