This covers a reboot after the one in my previous e-mail as well as another fail at the end. When I checked around 16:30 the mount point was inaccessible again with "stale file handle". Please note the "wrong peer at address" messages in the log, it seems that a number of issues come together here. These threads are actually all related to this file server and the observations we make now:
https://lists.ceph.io/hyperkitty/list/ceph-users@xxxxxxx/thread/MSB5TIG42XAFNG2CKILY5DZWIMX6C5CO/
https://lists.ceph.io/hyperkitty/list/ceph-users@xxxxxxx/thread/LYY7TBK63XPR6X6TD7372I2YEPJO2L6F/
You mentioned directory migration in the MDS, I guess you mean migrating a directory fragment between MDSes? This should not happen, all these directories are statically pinned to a rank. An MDS may split/merge directory fragments, but they stay at the same MDS all the time. This is confirmed by running a "dump inode" on directories under a pin. Only one MDS reports back that it has the dir inode in its cache, so I think the static pinning works as expected.
It would be great if you could also look at Greg's reply, maybe you have something I could look at to find the cause of the crash during the mds dump inode command.
Thanks a lot and best regards,
=================
Frank Schilder
AIT Risø Campus
Bygning 109, rum S14
________________________________________
From: Frank Schilder <frans@xxxxxx>
Sent: Thursday, May 11, 2023 12:26 PM
To: Xiubo Li; ceph-users@xxxxxxx
Subject: Re: mds dump inode crashes file system
Dear Xiubo,
thanks for your reply.
BTW, did you enabled the async dirop ? Currently this is disabled by
default in 4.18.0-486.el8.x86_64.
I have never heard about that option until now. How do I check that and how to I disable it if necessary?
I'm in meetings pretty much all day and will try to send some more info later.
Could you reproduce this by enabling the mds debug logs ?
Not right now. Our users are annoyed enough already. I first need to figure out how to move the troublesome inode somewhere else where I might be able to do something. The boot message shows up on this one file server every time. Is there any information about what dir/inode might be causing the issue? How could I reproduce this without affecting the users, say, by re-creating the same condition somewhere else? Any hints are appreciated.
Best regards,
=================
Frank Schilder
AIT Risø Campus
Bygning 109, rum S14
________________________________________
From: Xiubo Li <xiubli@xxxxxxxxxx>
Sent: Thursday, May 11, 2023 3:45 AM
To: Frank Schilder; ceph-users@xxxxxxx
Subject: Re: Re: mds dump inode crashes file system
Hey Frank,
On 5/10/23 21:44, Frank Schilder wrote:
The kernel message that shows up on boot on the file server in text format:
May 10 13:56:59 rit-pfile01 kernel: WARNING: CPU: 3 PID: 34 at fs/ceph/caps.c:689 ceph_add_cap+0x53e/0x550 [ceph]
May 10 13:56:59 rit-pfile01 kernel: Modules linked in: ceph libceph dns_resolver nls_utf8 isofs cirrus drm_shmem_helper intel_rapl_msr iTCO_wdt intel_rapl_common iTCO_vendor_support drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops pcspkr joydev virtio_net drm i2c_i801 net_failover virtio_balloon failover lpc_ich nfsd nfs_acl lockd auth_rpcgss grace sunrpc sr_mod cdrom sg xfs libcrc32c crct10dif_pclmul crc32_pclmul crc32c_intel ahci libahci ghash_clmulni_intel libata serio_raw virtio_blk virtio_console virtio_scsi dm_mirror dm_region_hash dm_log dm_mod fuse
May 10 13:56:59 rit-pfile01 kernel: CPU: 3 PID: 34 Comm: kworker/3:0 Not tainted 4.18.0-486.el8.x86_64 #1
May 10 13:56:59 rit-pfile01 kernel: Hardware name: Red Hat KVM/RHEL-AV, BIOS 1.16.0-3.module_el8.7.0+3346+68867adb 04/01/2014
May 10 13:56:59 rit-pfile01 kernel: Workqueue: ceph-msgr ceph_con_workfn [libceph]
May 10 13:56:59 rit-pfile01 kernel: RIP: 0010:ceph_add_cap+0x53e/0x550 [ceph]
May 10 13:56:59 rit-pfile01 kernel: Code: c0 48 c7 c7 c0 69 7f c0 e8 6c 4c 72 c3 0f 0b 44 89 7c 24 04 e9 7e fc ff ff 44 8b 7c 24 04 e9 68 fe ff ff 0f 0b e9 c9 fc ff ff <0f> 0b e9 0a fe ff ff 0f 0b e9 12 fe ff ff 0f 0b 66 90 0f 1f 44 00
May 10 13:56:59 rit-pfile01 kernel: RSP: 0018:ffffa4d000d87b48 EFLAGS: 00010217
May 10 13:56:59 rit-pfile01 kernel: RAX: 0000000000000000 RBX: 0000000000000005 RCX: dead000000000200
May 10 13:56:59 rit-pfile01 kernel: RDX: ffff92d7d7f6e7d0 RSI: ffff92d7d7f6e7d0 RDI: ffff92d7d7f6e7c8
May 10 13:56:59 rit-pfile01 kernel: RBP: ffff92d7c5588970 R08: ffff92d7d7f6e7d0 R09: 0000000000000001
May 10 13:56:59 rit-pfile01 kernel: R10: ffff92d80078cbb8 R11: 00000000ffff92c0 R12: 0000000000000155
May 10 13:56:59 rit-pfile01 kernel: R13: ffff92d80078cbb8 R14: ffff92d80078cbc0 R15: 0000000000000001
May 10 13:56:59 rit-pfile01 kernel: FS: 0000000000000000(0000) GS:ffff92d937d80000(0000) knlGS:0000000000000000
May 10 13:56:59 rit-pfile01 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
May 10 13:56:59 rit-pfile01 kernel: CR2: 00007f74435b9008 CR3: 00000001099fa000 CR4: 00000000003506e0
May 10 13:56:59 rit-pfile01 kernel: Call Trace:
May 10 13:56:59 rit-pfile01 kernel: ceph_handle_caps+0xdf2/0x1780 [ceph]
May 10 13:56:59 rit-pfile01 kernel: mds_dispatch+0x13a/0x670 [ceph]
May 10 13:56:59 rit-pfile01 kernel: ceph_con_process_message+0x79/0x140 [libceph]
May 10 13:56:59 rit-pfile01 kernel: ? calc_signature+0xdf/0x110 [libceph]
May 10 13:56:59 rit-pfile01 kernel: ceph_con_v1_try_read+0x5d7/0xf30 [libceph]
May 10 13:56:59 rit-pfile01 kernel: ceph_con_workfn+0x329/0x680 [libceph]
May 10 13:56:59 rit-pfile01 kernel: process_one_work+0x1a7/0x360
May 10 13:56:59 rit-pfile01 kernel: worker_thread+0x30/0x390
May 10 13:56:59 rit-pfile01 kernel: ? create_worker+0x1a0/0x1a0
May 10 13:56:59 rit-pfile01 kernel: kthread+0x134/0x150
May 10 13:56:59 rit-pfile01 kernel: ? set_kthread_struct+0x50/0x50
May 10 13:56:59 rit-pfile01 kernel: ret_from_fork+0x35/0x40
May 10 13:56:59 rit-pfile01 kernel: ---[ end trace 84e4b3694bbe9fde ]---
BTW, did you enabled the async dirop ? Currently this is disabled by
default in 4.18.0-486.el8.x86_64.
The async dirop is buggy and we have hit a very similar bug as above,
please see https://tracker.ceph.com/issues/55857. This is a racy between
the client requests and dir migrating in MDS and this has been fixed
long time ago.
If you didn't enable the async dirop then it should be a different issue
without the async dirop. But I guess this should also be a racy between
client requests and dir migrating in non-async dirop case.
And from the kernel call trace, I just guess the MDS was doing dir
spliting and migrating and the MDS daemon's crash possible caused by:
"dirfragtree.dump(f);"
Could you reproduce this by enabling the mds debug logs ?
Thanks
- Xiubo
I can't interpret it, some help is appreciated.
Best regards,
=================
Frank Schilder
AIT Risø Campus
Bygning 109, rum S14
________________________________________
From: Frank Schilder <frans@xxxxxx>
Sent: Wednesday, May 10, 2023 3:36 PM
To: ceph-users@xxxxxxx
Subject: Re: mds dump inode crashes file system
For the "mds dump inode" command I could find the crash in the log; see below. Most of the log contents is the past OPS dump from the 3 MDS restarts that happened. It contains the 10000 last OPS before the crash and I can upload the log if someone can use it. The crash stack trace somewhat truncated for readability:
2023-05-10T12:54:53.142+0200 7fe971ca6700 1 mds.ceph-23 Updating MDS map to version 892464 from mon.4
2023-05-10T13:39:50.962+0200 7fe96fca2700 0 log_channel(cluster) log [WRN] : client.205899841 isn't responding to mclientcaps(revoke), ino 0x20011d3e5cb pending pAsLsXsFscr issued pAsLsXsFscr, sent 61.705410 seconds ago
2023-05-10T13:39:52.550+0200 7fe971ca6700 1 mds.ceph-23 Updating MDS map to version 892465 from mon.4
2023-05-10T13:40:50.963+0200 7fe96fca2700 0 log_channel(cluster) log [WRN] : client.205899841 isn't responding to mclientcaps(revoke), ino 0x20011d3e5cb pending pAsLsXsFscr issued pAsLsXsFscr, sent 121.706193 seconds ago
2023-05-10T13:42:50.966+0200 7fe96fca2700 0 log_channel(cluster) log [WRN] : client.205899841 isn't responding to mclientcaps(revoke), ino 0x20011d3e5cb pending pAsLsXsFscr issued pAsLsXsFscr, sent 241.709072 seconds ago
2023-05-10T13:44:00.506+0200 7fe972ca8700 1 mds.ceph-23 asok_command: dump inode {number=2199322355147,prefix=dump inode} (starting...)
2023-05-10T13:44:00.520+0200 7fe972ca8700 -1 /home/jenkins-build/build/workspace/ceph-build/ARCH/x86_64/AVAILABLE_ARCH/x86_64/AVAILABLE_DIST/centos8/DIST/centos8/MACHINE_SIZE/gigantic/release/15.2.17/rpm/el8/BUILD/ceph-15.2.17/src/common/buffer.cc: In function 'const char* ceph::buffer::v15_2_0::ptr::c_str() const' thread 7fe972ca8700 time 2023-05-10T13:44:00.507652+0200
/home/jenkins-build/build/workspace/ceph-build/ARCH/x86_64/AVAILABLE_ARCH/x86_64/AVAILABLE_DIST/centos8/DIST/centos8/MACHINE_SIZE/gigantic/release/15.2.17/rpm/el8/BUILD/ceph-15.2.17/src/common/buffer.cc: 501: FAILED ceph_assert(_raw)
ceph version 15.2.17 (8a82819d84cf884bd39c17e3236e0632ac146dc4) octopus (stable)
1: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x158) [0x7fe979ae9b92]
2: (()+0x27ddac) [0x7fe979ae9dac]
3: (()+0x5ce831) [0x7fe979e3a831]
4: (InodeStoreBase::dump(ceph::Formatter*) const+0x153) [0x55c08c59b543]
5: (CInode::dump(ceph::Formatter*, int) const+0x144) [0x55c08c59b8d4]
6: (MDCache::dump_inode(ceph::Formatter*, unsigned long)+0x7c) [0x55c08c41e00c]
7: (MDSRank::command_dump_inode(ceph::Formatter*, ..., std::ostream&)+0xb5) [0x55c08c353e75]
8: (MDSRankDispatcher::handle_asok_command(std::basic_string_view<char, std::char_traits<char> >, ..., ceph::buffer::v15_2_0::list&)>)+0x2296) [0x55c08c36c5f6]
9: (MDSDaemon::asok_command(std::basic_string_view<char, ..., ceph::buffer::v15_2_0::list&)>)+0x75b) [0x55c08c340eab]
10: (MDSSocketHook::call_async(std::basic_string_view<char, std::char_traits<char> >, ..., ceph::buffer::v15_2_0::list&)>)+0x6a) [0x55c08c34f9ca]
11: (AdminSocket::execute_command(std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, ..., ceph::buffer::v15_2_0::list&)>)+0x6f9) [0x7fe979bece59]
12: (AdminSocket::do_tell_queue()+0x289) [0x7fe979bed809]
13: (AdminSocket::entry()+0x4d3) [0x7fe979beefd3]
14: (()+0xc2ba3) [0x7fe977afaba3]
15: (()+0x81ca) [0x7fe9786bf1ca]
16: (clone()+0x43) [0x7fe977111dd3]
2023-05-10T13:44:00.522+0200 7fe972ca8700 -1 *** Caught signal (Aborted) **
in thread 7fe972ca8700 thread_name:admin_socket
ceph version 15.2.17 (8a82819d84cf884bd39c17e3236e0632ac146dc4) octopus (stable)
1: (()+0x12ce0) [0x7fe9786c9ce0]
2: (gsignal()+0x10f) [0x7fe977126a9f]
3: (abort()+0x127) [0x7fe9770f9e05]
4: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x1a9) [0x7fe979ae9be3]
5: (()+0x27ddac) [0x7fe979ae9dac]
6: (()+0x5ce831) [0x7fe979e3a831]
7: (InodeStoreBase::dump(ceph::Formatter*) const+0x153) [0x55c08c59b543]
8: (CInode::dump(ceph::Formatter*, int) const+0x144) [0x55c08c59b8d4]
9: (MDCache::dump_inode(ceph::Formatter*, unsigned long)+0x7c) [0x55c08c41e00c]
10: (MDSRank::command_dump_inode(ceph::Formatter*, ..., std::ostream&)+0xb5) [0x55c08c353e75]
11: (MDSRankDispatcher::handle_asok_command(std::basic_string_view<char, std::char_traits<char> >, ..., ceph::buffer::v15_2_0::list&)>)+0x2296) [0x55c08c36c5f6]
12: (MDSDaemon::asok_command(std::basic_string_view<char, std::char_traits<char> >, ..., ceph::buffer::v15_2_0::list&)>)+0x75b) [0x55c08c340eab]
13: (MDSSocketHook::call_async(std::basic_string_view<char, std::char_traits<char> >, ..., ceph::buffer::v15_2_0::list&)>)+0x6a) [0x55c08c34f9ca]
14: (AdminSocket::execute_command(std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, ..., ceph::buffer::v15_2_0::list&)>)+0x6f9) [0x7fe979bece59]
15: (AdminSocket::do_tell_queue()+0x289) [0x7fe979bed809]
16: (AdminSocket::entry()+0x4d3) [0x7fe979beefd3]
17: (()+0xc2ba3) [0x7fe977afaba3]
18: (()+0x81ca) [0x7fe9786bf1ca]
19: (clone()+0x43) [0x7fe977111dd3]
NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.
Best regards,
=================
Frank Schilder
AIT Risø Campus
Bygning 109, rum S14
________________________________________
From: Frank Schilder <frans@xxxxxx>
Sent: Wednesday, May 10, 2023 2:33 PM
To: ceph-users@xxxxxxx
Subject: mds dump inode crashes file system
Hi all,
I have an annoying problem with a specific ceph fs client. We have a file server on which we re-export kernel mounts via samba (all mounts with noshare option). On one of these re-exports we have recurring problems. Today I caught it with
2023-05-10T13:39:50.963685+0200 mds.ceph-23 (mds.1) 1761 : cluster [WRN] client.205899841 isn't responding to mclientcaps(revoke), ino 0x20011d3e5cb pending pAsLsXsFscr issued pAsLsXsFscr, sent 61.705410 seconds ago
and I wanted to look up what path the inode 0x20011d3e5cb points to. Unfortunately, the command
ceph tell "mds.*" dump inode 0x20011d3e5cb
crashes an MDS in a way that it restarts itself, but doesn't seem to come back clean (it does not fail over to a stand-by). If I repeat the command above, it crashes the MDS again. Execution on other MDS daemons succeeds, for example:
# ceph tell "mds.ceph-24" dump inode 0x20011d3e5cb
2023-05-10T14:14:37.091+0200 7fa47ffff700 0 client.210149523 ms_handle_reset on v2:192.168.32.88:6800/3216233914
2023-05-10T14:14:37.124+0200 7fa4857fa700 0 client.210374440 ms_handle_reset on v2:192.168.32.88:6800/3216233914
dump inode failed, wrong inode number or the inode is not cached
The caps recall gets the client evicted at some point but it doesn't manage to come back clean. On a single ceph fs mount point I see this
# ls /shares/samba/rit-oil
ls: cannot access '/shares/samba/rit-oil': Stale file handle
All other mount points are fine, just this one acts up. A "mount -o remount /shares/samba/rit-oil" crashed the entire server and I had to do a cold reboot. On reboot I see this message: https://imgur.com/a/bOSLxBb , which only occurs on this one file server (we are running a few of those). Does this point to a more serious problem, like a file system corruption? Should I try an fs scrub on the corresponding path?
Some info about the system:
The file server's kernel version is quite recent, updated two weeks ago:
$ uname -r
4.18.0-486.el8.x86_64
# cat /etc/redhat-release
CentOS Stream release 8
Our ceph cluster is octopus latest and we use the packages from the octopus el8 repo on this server.
We have several such shares and they all work fine. It is only on one share where we have persistent problems with the mount point hanging or the server freezing and crashing.
After working hours I will try a proper fail of the "broken" MDS to see if I can execute the dump inode command without it crashing everything.
In the mean time, any hints would be appreciated. I see that we have an exceptionally large MDS log for the problematic one. Any hint what to look for would be appreciated, it contains a lot from the recovery operations:
# pdsh -w ceph-[08-17,23-24] ls -lh "/var/log/ceph/ceph-mds.ceph-??.log"
ceph-23: -rw-r--r--. 1 ceph ceph 15M May 10 14:28 /var/log/ceph/ceph-mds.ceph-23.log *** huge ***
ceph-24: -rw-r--r--. 1 ceph ceph 14K May 10 14:28 /var/log/ceph/ceph-mds.ceph-24.log
ceph-10: -rw-r--r--. 1 ceph ceph 394 May 10 14:02 /var/log/ceph/ceph-mds.ceph-10.log
ceph-13: -rw-r--r--. 1 ceph ceph 394 May 10 14:02 /var/log/ceph/ceph-mds.ceph-13.log
ceph-08: -rw-r--r--. 1 ceph ceph 394 May 10 14:02 /var/log/ceph/ceph-mds.ceph-08.log
ceph-15: -rw-r--r--. 1 ceph ceph 14K May 10 14:28 /var/log/ceph/ceph-mds.ceph-15.log
ceph-17: -rw-r--r--. 1 ceph ceph 14K May 10 14:28 /var/log/ceph/ceph-mds.ceph-17.log
ceph-14: -rw-r--r--. 1 ceph ceph 16K May 10 14:28 /var/log/ceph/ceph-mds.ceph-14.log
ceph-09: -rw-r--r--. 1 ceph ceph 16K May 10 14:28 /var/log/ceph/ceph-mds.ceph-09.log
ceph-16: -rw-r--r--. 1 ceph ceph 15K May 10 14:28 /var/log/ceph/ceph-mds.ceph-16.log
ceph-11: -rw-r--r--. 1 ceph ceph 14K May 10 14:28 /var/log/ceph/ceph-mds.ceph-11.log
ceph-12: -rw-r--r--. 1 ceph ceph 394 May 10 14:02 /var/log/ceph/ceph-mds.ceph-12.log
Thanks and best regards,
=================
Frank Schilder
AIT Risø Campus
Bygning 109, rum S14
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