[Gluster-users] Gluster Periodic Brick Process Deaths

Xavi Hernandez
Wed, 11 Dec 2019 12:16:08 -0000

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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