Browser launch on desktop crashes UCS master

Hi@all,

the system always ran without problems. On the UCS master (5.0.2) the shares are provided. The client (LM 20.2 / Ubuntu 20.04) obtains its /home/$USER dynamically during login via NFSv4/Kerberos.

This also works as it has all along. I can work on the client with all files from the server. Even for hours.

However, as soon as I start a browser on the client, the UCS crashes (see below). It does not matter if it is Firefox or Chromium.

After I logged the user on the desktop there are the following mounts here:

sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
udev on /dev type devtmpfs (rw,nosuid,noexec,relatime,size=32816688k,nr_inodes=8204172,mode=755,inode64)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,nodev,noexec,relatime,size=6576012k,mode=755,inode64)
/dev/nvme0n1p2 on / type btrfs (rw,relatime,ssd,space_cache,subvolid=302,subvol=/@)
securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev,inode64)
tmpfs on /run/lock type tmpfs (rw,nosuid,nodev,noexec,relatime,size=5120k,inode64)
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755,inode64)
cgroup2 on /sys/fs/cgroup/unified type cgroup2 (rw,nosuid,nodev,noexec,relatime,nsdelegate)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,name=systemd)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
efivarfs on /sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
bpf on /sys/fs/bpf type bpf (rw,nosuid,nodev,noexec,relatime,mode=700)
cgroup on /sys/fs/cgroup/rdma type cgroup (rw,nosuid,nodev,noexec,relatime,rdma)
cgroup on /sys/fs/cgroup/misc type cgroup (rw,nosuid,nodev,noexec,relatime,misc)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpu,cpuacct)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls,net_prio)
cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,pids)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=28,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=37224)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,pagesize=2M)
mqueue on /dev/mqueue type mqueue (rw,nosuid,nodev,noexec,relatime)
debugfs on /sys/kernel/debug type debugfs (rw,nosuid,nodev,noexec,relatime)
tracefs on /sys/kernel/tracing type tracefs (rw,nosuid,nodev,noexec,relatime)
sunrpc on /run/rpc_pipefs type rpc_pipefs (rw,relatime)
fusectl on /sys/fs/fuse/connections type fusectl (rw,nosuid,nodev,noexec,relatime)
configfs on /sys/kernel/config type configfs (rw,nosuid,nodev,noexec,relatime)
/dev/nvme0n1p1 on /boot/efi type vfat (rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)
tmpfs on /run/user/0 type tmpfs (rw,nosuid,nodev,relatime,size=6576008k,mode=700,inode64)
srv01.lan.extern.de:/home/s.gehr on /home/s.gehr type nfs4 (rw,nosuid,relatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,soft,nocto,proto=tcp,timeo=600,retrans=2,sec=krb5i,clientaddr=192.168.83.140,fsc,local_lock=none,addr=192.168.83.5,_netdev)
//srv01.lan.extern.de/Bilder on /data01/Bilder type cifs (rw,relatime,vers=3.1.1,cache=strict,username=s.gehr,uid=1381401120,noforceuid,gid=1381400513,noforcegid,addr=192.168.83.5,file_mode=0755,dir_mode=0755,iocharset=utf8,soft,nounix,serverino,mapposix,fsc,rsize=4194304,wsize=4194304,bsize=1048576,echo_interval=60,actimeo=1)
//srv01.lan.extern.de/Buchhaltung on /data01/Buchhaltung type cifs (rw,relatime,vers=3.1.1,cache=strict,username=s.gehr,uid=1381401120,noforceuid,gid=1381400513,noforcegid,addr=192.168.83.5,file_mode=0755,dir_mode=0755,iocharset=utf8,soft,nounix,serverino,mapposix,fsc,rsize=4194304,wsize=4194304,bsize=1048576,echo_interval=60,actimeo=1)
//srv01.lan.extern.de/Downloads on /data01/Downloads type cifs (rw,relatime,vers=3.1.1,cache=strict,username=s.gehr,uid=1381401120,noforceuid,gid=1381400513,noforcegid,addr=192.168.83.5,file_mode=0755,dir_mode=0755,iocharset=utf8,soft,nounix,serverino,mapposix,fsc,rsize=4194304,wsize=4194304,bsize=1048576,echo_interval=60,actimeo=1)
//srv01.lan.extern.de/Fotos on /data01/Fotos type cifs (rw,relatime,vers=3.1.1,cache=strict,username=s.gehr,uid=1381401120,noforceuid,gid=1381400513,noforcegid,addr=192.168.83.5,file_mode=0755,dir_mode=0755,iocharset=utf8,soft,nounix,serverino,mapposix,fsc,rsize=4194304,wsize=4194304,bsize=1048576,echo_interval=60,actimeo=1)
//srv01.lan.extern.de/Fotos_JPG on /data01/Fotos_JPG type cifs (rw,relatime,vers=3.1.1,cache=strict,username=s.gehr,uid=1381401120,noforceuid,gid=1381400513,noforcegid,addr=192.168.83.5,file_mode=0755,dir_mode=0755,iocharset=utf8,soft,nounix,serverino,mapposix,fsc,rsize=4194304,wsize=4194304,bsize=1048576,echo_interval=60,actimeo=1)
//srv01.lan.extern.de/ISOs on /data01/ISOs type cifs (rw,relatime,vers=3.1.1,cache=strict,username=s.gehr,uid=1381401120,noforceuid,gid=1381400513,noforcegid,addr=192.168.83.5,file_mode=0755,dir_mode=0755,iocharset=utf8,soft,nounix,serverino,mapposix,fsc,rsize=4194304,wsize=4194304,bsize=1048576,echo_interval=60,actimeo=1)
//srv01.lan.extern.de/Musik on /data01/Musik type cifs (rw,relatime,vers=3.1.1,cache=strict,username=s.gehr,uid=1381401120,noforceuid,gid=1381400513,noforcegid,addr=192.168.83.5,file_mode=0755,dir_mode=0755,iocharset=utf8,soft,nounix,serverino,mapposix,fsc,rsize=4194304,wsize=4194304,bsize=1048576,echo_interval=60,actimeo=1)
//srv01.lan.extern.de/Musik-Download on /data01/Musik-Download type cifs (rw,relatime,vers=3.1.1,cache=strict,username=s.gehr,uid=1381401120,noforceuid,gid=1381400513,noforcegid,addr=192.168.83.5,file_mode=0755,dir_mode=0755,iocharset=utf8,soft,nounix,serverino,mapposix,fsc,rsize=4194304,wsize=4194304,bsize=1048576,echo_interval=60,actimeo=1)
//srv01.lan.extern.de/Projekte on /data01/Projekte type cifs (rw,relatime,vers=3.1.1,cache=strict,username=s.gehr,uid=1381401120,noforceuid,gid=1381400513,noforcegid,addr=192.168.83.5,file_mode=0755,dir_mode=0755,iocharset=utf8,soft,nounix,serverino,mapposix,fsc,rsize=4194304,wsize=4194304,bsize=1048576,echo_interval=60,actimeo=1)
//srv01.lan.extern.de/Sicherheit on /data01/Sicherheit type cifs (rw,relatime,vers=3.1.1,cache=strict,username=s.gehr,uid=1381401120,noforceuid,gid=1381400513,noforcegid,addr=192.168.83.5,file_mode=0755,dir_mode=0755,iocharset=utf8,soft,nounix,serverino,mapposix,fsc,rsize=4194304,wsize=4194304,bsize=1048576,echo_interval=60,actimeo=1)
//srv01.lan.extern.de/Sonstiges on /data01/Sonstiges type cifs (rw,relatime,vers=3.1.1,cache=strict,username=s.gehr,uid=1381401120,noforceuid,gid=1381400513,noforcegid,addr=192.168.83.5,file_mode=0755,dir_mode=0755,iocharset=utf8,soft,nounix,serverino,mapposix,fsc,rsize=4194304,wsize=4194304,bsize=1048576,echo_interval=60,actimeo=1)
//srv01.lan.extern.de/Texte on /data01/Texte type cifs (rw,relatime,vers=3.1.1,cache=strict,username=s.gehr,uid=1381401120,noforceuid,gid=1381400513,noforcegid,addr=192.168.83.5,file_mode=0755,dir_mode=0755,iocharset=utf8,soft,nounix,serverino,mapposix,fsc,rsize=4194304,wsize=4194304,bsize=1048576,echo_interval=60,actimeo=1)
//srv01.lan.extern.de/Videos on /data01/Videos type cifs (rw,relatime,vers=3.1.1,cache=strict,username=s.gehr,uid=1381401120,noforceuid,gid=1381400513,noforcegid,addr=192.168.83.5,file_mode=0755,dir_mode=0755,iocharset=utf8,soft,nounix,serverino,mapposix,fsc,rsize=4194304,wsize=4194304,bsize=1048576,echo_interval=60,actimeo=1)
//srv01.lan.extern.de/Scan on /data01/Scan type cifs (rw,relatime,vers=3.1.1,cache=strict,username=s.gehr,uid=1381401120,noforceuid,gid=1381400513,noforcegid,addr=192.168.83.5,file_mode=0755,dir_mode=0755,iocharset=utf8,soft,nounix,serverino,mapposix,fsc,rsize=4194304,wsize=4194304,bsize=1048576,echo_interval=60,actimeo=1)
//srv01.lan.extern.de/Filme on /data01/Filme type cifs (rw,relatime,vers=3.1.1,cache=strict,username=s.gehr,uid=1381401120,noforceuid,gid=1381400513,noforcegid,addr=192.168.83.5,file_mode=0755,dir_mode=0755,iocharset=utf8,soft,nounix,serverino,mapposix,fsc,rsize=4194304,wsize=4194304,bsize=1048576,echo_interval=60,actimeo=1)
tmpfs on /run/user/1381401120 type tmpfs (rw,nosuid,nodev,relatime,size=6576008k,mode=700,uid=1381401120,gid=1381400513,inode64)
gvfsd-fuse on /run/user/1381401120/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,relatime,user_id=1381401120,group_id=1381400513)
portal on /run/user/1381401120/doc type fuse.portal (rw,nosuid,nodev,relatime,user_id=1381401120,group_id=1381400513)

As mentioned. I can work with all files, whether under /home/me (NFSv4) or the other mounts (SMB), for hours without problems. As soon as I start a browser it takes 10-20 seconds and the UCS crashes with the following message:

Aug 01 22:19:41 srv01 named[891]: resolver priming query complete
Aug 01 22:19:48 srv01 slapd[786]: <= mdb_equality_candidates: (nextcloudEnabled) not indexed
Aug 01 22:20:01 srv01 CRON[8182]: pam_unix(cron:session): session opened for user root by (uid=0)
Aug 01 22:20:01 srv01 CRON[8181]: pam_unix(cron:session): session opened for user root by (uid=0)
Aug 01 22:20:01 srv01 CRON[8183]: pam_unix(cron:session): session opened for user root by (uid=0)
Aug 01 22:20:01 srv01 CRON[8184]: pam_unix(cron:session): session opened for user root by (uid=0)
Aug 01 22:20:01 srv01 CRON[8194]: (root) CMD (  if [ -x /usr/sbin/univention-umount-homedirs ]; then /usr/sbin/univention-umount-homedirs; fi)
Aug 01 22:20:01 srv01 CRON[8195]: (root) CMD (/usr/sbin/jitter 60 /usr/share/univention-samba4/scripts/sysvol-sync.sh >>/var/log/univention/sysvol-sync.log 2>&1)
Aug 01 22:20:01 srv01 CRON[8181]: pam_unix(cron:session): session closed for user root
Aug 01 22:20:01 srv01 CRON[8199]: (root) CMD (/usr/share/univention-ssl/ssl-sync >>/var/log/univention/ssl-sync.log 2>&1)
Aug 01 22:20:01 srv01 CRON[8202]: (root) CMD (run-parts /usr/share/univention-monitoring-client/scripts/)
Aug 01 22:20:01 srv01 CRON[8183]: pam_unix(cron:session): session closed for user root
Aug 01 22:20:02 srv01 slapd[786]: <= mdb_equality_candidates: (nextcloudEnabled) not indexed
Aug 01 22:20:11 srv01 ldapsearch[8223]: DIGEST-MD5 common mech free
Aug 01 22:20:11 srv01 ldapsearch[8224]: DIGEST-MD5 common mech free
Aug 01 22:20:11 srv01 ldapsearch[8225]: DIGEST-MD5 common mech free
Aug 01 22:20:18 srv01 kernel: general protection fault: 0000 [#1] SMP PTI
Aug 01 22:20:18 srv01 kernel: CPU: 7 PID: 8281 Comm: samba-dcerpcd Not tainted 4.19.0-21-amd64 #1 Debian 4.19.249-2
Aug 01 22:20:18 srv01 kernel: Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Aug 01 22:20:18 srv01 kernel: RIP: 0010:kmem_cache_alloc+0x82/0x1d0
Aug 01 22:20:18 srv01 kernel: Code: 08 65 4c 03 05 a7 7a 5e 56 49 83 78 10 00 49 8b 28 0f 84 1b 01 00 00 48 85 ed 0f 84 12 01 00 00 41 8b 46 20 49 8b 3e 48 01 e8 <48> 8b 18 48 89 c1 49 33 9e 38 01 00 00 48 89 e8 48 0f c9 48 31 cb
Aug 01 22:20:18 srv01 kernel: RSP: 0018:ffffa8f40e35bc80 EFLAGS: 00010286
Aug 01 22:20:18 srv01 kernel: RAX: 99128c3ff5cbeb12 RBX: 0000000000000000 RCX: 0000000000000000
Aug 01 22:20:18 srv01 kernel: RDX: 000000000000c7d7 RSI: 00000000006080c0 RDI: 00003150e421f690
Aug 01 22:20:18 srv01 kernel: RBP: 99128c3ff5cbeb12 R08: ffffc8f3ffddf690 R09: 0000000000000000
Aug 01 22:20:18 srv01 kernel: R10: fefefefefefefeff R11: 0000000000000fe0 R12: 00000000006080c0
Aug 01 22:20:18 srv01 kernel: R13: ffffffffa9a5771a R14: ffff97a3095d1080 R15: ffff97a31b567c80
Aug 01 22:20:18 srv01 kernel: FS:  0000000000000000(0000) GS:ffff97a31bbc0000(0000) knlGS:0000000000000000
Aug 01 22:20:18 srv01 kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Aug 01 22:20:18 srv01 kernel: CR2: 00007f02da131260 CR3: 00000008a461c000 CR4: 00000000000006e0
Aug 01 22:20:18 srv01 kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Aug 01 22:20:18 srv01 kernel: DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Aug 01 22:20:18 srv01 kernel: Call Trace:
Aug 01 22:20:18 srv01 kernel:  __alloc_file+0x2a/0xf0
Aug 01 22:20:18 srv01 kernel:  alloc_empty_file+0x43/0xc0
Aug 01 22:20:18 srv01 kernel:  path_openat+0x4c/0x1480
Aug 01 22:20:18 srv01 kernel:  ? alloc_set_pte+0xf7/0x550
Aug 01 22:20:18 srv01 kernel:  ? filemap_map_pages+0x360/0x3a0
Aug 01 22:20:18 srv01 kernel:  do_filp_open+0x93/0x100
Aug 01 22:20:18 srv01 kernel:  ? __check_object_size+0x162/0x180
Aug 01 22:20:18 srv01 kernel:  do_sys_open+0x186/0x210
Aug 01 22:20:18 srv01 kernel:  do_syscall_64+0x53/0x110
Aug 01 22:20:18 srv01 kernel:  entry_SYSCALL_64_after_hwframe+0x44/0xa9
Aug 01 22:20:18 srv01 kernel: RIP: 0033:0x7f02da5794fd
Aug 01 22:20:18 srv01 kernel: Code: 48 89 54 24 e0 41 83 e2 40 75 32 89 f0 25 00 00 41 00 3d 00 00 41 00 74 24 89 f2 b8 01 01 00 00 48 89 fe bf 9c ff ff ff 0f 05 <48> 3d 00 f0 ff ff 77 33 c3 66 2e 0f 1f 84 00 00 00 00 00 48 8d 44
Aug 01 22:20:18 srv01 kernel: RSP: 002b:00007fffba8bae38 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
Aug 01 22:20:18 srv01 kernel: RAX: ffffffffffffffda RBX: 00007fffba8baf30 RCX: 00007f02da5794fd
Aug 01 22:20:18 srv01 kernel: RDX: 0000000000080000 RSI: 00007f02da16c470 RDI: 00000000ffffff9c
Aug 01 22:20:18 srv01 kernel: RBP: 00007fffba8baea0 R08: 0000000000000000 R09: 00007fffba8baf1f
Aug 01 22:20:18 srv01 kernel: R10: 0000000000000000 R11: 0000000000000287 R12: 00007f02da588190
Aug 01 22:20:18 srv01 kernel: R13: 0000000000000000 R14: 0000000000000000 R15: 00007fffba8baf1f
Aug 01 22:20:18 srv01 kernel: Modules linked in: cbc cts rpcsec_gss_krb5 ipt_MASQUERADE nf_conntrack_netlink xfrm_user xfrm_algo xt_addrtype br_netfilter bridge stp llc ip6t_REJECT nf_reject_ipv6 ipt_REJECT nf_reject_ipv4 xt_tcpudp xt_state xt_conntrack nft_compat nft_counter nft_chain_route_ipv6 nft_chain_route_ipv4 nft_chain_nat_ipv4 nf_nat_ipv4 nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables nfnetlink overlay pcc_cpufreq xfs libcrc32c joydev sg pcspkr virtio_balloon serio_raw virtio_console evdev qemu_fw_cfg nfsd quota_v2 nfs_acl lockd quota_tree parport_pc auth_rpcgss grace ppdev sunrpc lp parport ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 crc32c_generic fscrypto ecb crypto_simd cryptd glue_helper aes_x86_64 dm_snapshot dm_bufio dm_mirror dm_region_hash dm_log dm_mod hid_generic usbhid hid
Aug 01 22:20:18 srv01 kernel:  sd_mod bochs_drm virtio_net sr_mod ttm cdrom net_failover failover virtio_scsi ata_generic drm_kms_helper ata_piix uhci_hcd libata drm ehci_hcd psmouse usbcore scsi_mod i2c_piix4 virtio_pci virtio_ring virtio usb_common floppy button
Aug 01 22:20:18 srv01 kernel: ---[ end trace b207eb3a9827f806 ]---
Aug 01 22:20:18 srv01 kernel: RIP: 0010:kmem_cache_alloc+0x82/0x1d0
Aug 01 22:20:18 srv01 kernel: Code: 08 65 4c 03 05 a7 7a 5e 56 49 83 78 10 00 49 8b 28 0f 84 1b 01 00 00 48 85 ed 0f 84 12 01 00 00 41 8b 46 20 49 8b 3e 48 01 e8 <48> 8b 18 48 89 c1 49 33 9e 38 01 00 00 48 89 e8 48 0f c9 48 31 cb
Aug 01 22:20:18 srv01 kernel: RSP: 0018:ffffa8f40e35bc80 EFLAGS: 00010286
Aug 01 22:20:18 srv01 kernel: RAX: 99128c3ff5cbeb12 RBX: 0000000000000000 RCX: 0000000000000000
Aug 01 22:20:18 srv01 kernel: RDX: 000000000000c7d7 RSI: 00000000006080c0 RDI: 00003150e421f690
Aug 01 22:20:18 srv01 kernel: RBP: 99128c3ff5cbeb12 R08: ffffc8f3ffddf690 R09: 0000000000000000
Aug 01 22:20:18 srv01 kernel: R10: fefefefefefefeff R11: 0000000000000fe0 R12: 00000000006080c0
Aug 01 22:20:18 srv01 kernel: R13: ffffffffa9a5771a R14: ffff97a3095d1080 R15: ffff97a31b567c80
Aug 01 22:20:18 srv01 kernel: FS:  0000000000000000(0000) GS:ffff97a31bbc0000(0000) knlGS:0000000000000000
Aug 01 22:20:18 srv01 kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Aug 01 22:20:18 srv01 kernel: CR2: 00007f02da131260 CR3: 00000008a461c000 CR4: 00000000000006e0
Aug 01 22:20:18 srv01 kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Aug 01 22:20:18 srv01 kernel: DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Aug 01 22:20:18 srv01 smbd[8280]: pam_unix(samba:session): session closed for user NT AUTHORITY+ANONYMOUS LOGON
Aug 01 22:20:18 srv01 postfix/smtpd[8284]: connect from localhost[127.0.0.1]
Aug 01 22:20:18 srv01 postfix/smtpd[8284]: disconnect from localhost[127.0.0.1] helo=1 quit=1 commands=2
Aug 01 22:20:18 srv01 CRON[8182]: pam_unix(cron:session): session closed for user root
Aug 01 22:20:34 srv01 named[891]: resolver priming query complete
Aug 01 22:20:46 srv01 smbd[5407]: pam_unix(samba:session): session closed for user LAN+s.gehr
Aug 01 22:21:00 srv01 CRON[8184]: pam_unix(cron:session): session closed for user root
Aug 01 22:21:08 srv01 kernel: general protection fault: 0000 [#2] SMP PTI
Aug 01 22:21:08 srv01 kernel: CPU: 7 PID: 8317 Comm: smbd Tainted: G      D           4.19.0-21-amd64 #1 Debian 4.19.249-2
Aug 01 22:21:08 srv01 kernel: Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Aug 01 22:21:08 srv01 kernel: RIP: 0010:kmem_cache_alloc+0x82/0x1d0
Aug 01 22:21:08 srv01 kernel: Code: 08 65 4c 03 05 a7 7a 5e 56 49 83 78 10 00 49 8b 28 0f 84 1b 01 00 00 48 85 ed 0f 84 12 01 00 00 41 8b 46 20 49 8b 3e 48 01 e8 <48> 8b 18 48 89 c1 49 33 9e 38 01 00 00 48 89 e8 48 0f c9 48 31 cb
Aug 01 22:21:08 srv01 kernel: RSP: 0018:ffffa8f40e2c3de0 EFLAGS: 00010286
Aug 01 22:21:08 srv01 kernel: RAX: 99128c3ff5cbeb12 RBX: 0000000000000000 RCX: ffff97a2a94c2938
Aug 01 22:21:08 srv01 kernel: RDX: 000000000000c7fd RSI: 00000000006080c0 RDI: 00003150e421f690
Aug 01 22:21:08 srv01 kernel: RBP: 99128c3ff5cbeb12 R08: ffffc8f3ffddf690 R09: 5d6c6c6f70746e65
Aug 01 22:21:08 srv01 kernel: R10: ffff97a2984b9e40 R11: 0000000000000000 R12: 00000000006080c0
Aug 01 22:21:08 srv01 kernel: R13: ffffffffa9a5771a R14: ffff97a3095d1080 R15: ffff97a31b567c80
Aug 01 22:21:08 srv01 kernel: FS:  00007fb169a8ae40(0000) GS:ffff97a31bbc0000(0000) knlGS:0000000000000000
Aug 01 22:21:08 srv01 kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Aug 01 22:21:08 srv01 kernel: CR2: 00007fb16957c210 CR3: 00000008986ea000 CR4: 00000000000006e0
Aug 01 22:21:08 srv01 kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Aug 01 22:21:08 srv01 kernel: DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Aug 01 22:21:08 srv01 kernel: Call Trace:
Aug 01 22:21:08 srv01 kernel:  __alloc_file+0x2a/0xf0
Aug 01 22:21:08 srv01 kernel:  ? kmem_cache_alloc+0x167/0x1d0
Aug 01 22:21:08 srv01 kernel:  alloc_empty_file+0x43/0xc0
Aug 01 22:21:08 srv01 kernel:  ? __d_instantiate+0xb4/0xd0
Aug 01 22:21:08 srv01 kernel:  alloc_file+0x2b/0xe0
Aug 01 22:21:08 srv01 kernel:  alloc_file_pseudo+0xa7/0x100
Aug 01 22:21:08 srv01 kernel:  anon_inode_getfile+0x7f/0xe0
Aug 01 22:21:08 srv01 kernel:  do_epoll_create+0xf6/0x150
Aug 01 22:21:08 srv01 kernel:  __x64_sys_epoll_create+0x13/0x20
Aug 01 22:21:08 srv01 kernel:  do_syscall_64+0x53/0x110
Aug 01 22:21:08 srv01 kernel:  entry_SYSCALL_64_after_hwframe+0x44/0xa9
Aug 01 22:21:08 srv01 kernel: RIP: 0033:0x7fb16d8e5837
Aug 01 22:21:08 srv01 kernel: Code: 73 01 c3 48 8b 0d 59 06 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 d5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 29 06 0c 00 f7 d8 64 89 01 48
Aug 01 22:21:08 srv01 kernel: RSP: 002b:00007ffcb6e7c538 EFLAGS: 00000202 ORIG_RAX: 00000000000000d5
Aug 01 22:21:08 srv01 kernel: RAX: ffffffffffffffda RBX: 0000555b28c1ef80 RCX: 00007fb16d8e5837
Aug 01 22:21:08 srv01 kernel: RDX: 0000000000000028 RSI: 0000000000000000 RDI: 0000000000000040
Aug 01 22:21:08 srv01 kernel: RBP: 0000555b27ce18d0 R08: 000000000000ffff R09: 0000000000000000
Aug 01 22:21:08 srv01 kernel: R10: 00007fb16d87c250 R11: 0000000000000202 R12: 0000555b27ce18d0
Aug 01 22:21:08 srv01 kernel: R13: 00007fb16c960610 R14: 0000000000000000 R15: 0000555b28fdca80
Aug 01 22:21:08 srv01 kernel: Modules linked in: cbc cts rpcsec_gss_krb5 ipt_MASQUERADE nf_conntrack_netlink xfrm_user xfrm_algo xt_addrtype br_netfilter bridge stp llc ip6t_REJECT nf_reject_ipv6 ipt_REJECT nf_reject_ipv4 xt_tcpudp xt_state xt_conntrack nft_compat nft_counter nft_chain_route_ipv6 nft_chain_route_ipv4 nft_chain_nat_ipv4 nf_nat_ipv4 nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables nfnetlink overlay pcc_cpufreq xfs libcrc32c joydev sg pcspkr virtio_balloon serio_raw virtio_console evdev qemu_fw_cfg nfsd quota_v2 nfs_acl lockd quota_tree parport_pc auth_rpcgss grace ppdev sunrpc lp parport ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 crc32c_generic fscrypto ecb crypto_simd cryptd glue_helper aes_x86_64 dm_snapshot dm_bufio dm_mirror dm_region_hash dm_log dm_mod hid_generic usbhid hid
Aug 01 22:21:08 srv01 kernel:  sd_mod bochs_drm virtio_net sr_mod ttm cdrom net_failover failover virtio_scsi ata_generic drm_kms_helper ata_piix uhci_hcd libata drm ehci_hcd psmouse usbcore scsi_mod i2c_piix4 virtio_pci virtio_ring virtio usb_common floppy button
Aug 01 22:21:08 srv01 kernel: ---[ end trace b207eb3a9827f807 ]---
Aug 01 22:21:08 srv01 kernel: RIP: 0010:kmem_cache_alloc+0x82/0x1d0
Aug 01 22:21:08 srv01 kernel: Code: 08 65 4c 03 05 a7 7a 5e 56 49 83 78 10 00 49 8b 28 0f 84 1b 01 00 00 48 85 ed 0f 84 12 01 00 00 41 8b 46 20 49 8b 3e 48 01 e8 <48> 8b 18 48 89 c1 49 33 9e 38 01 00 00 48 89 e8 48 0f c9 48 31 cb
Aug 01 22:21:08 srv01 kernel: RSP: 0018:ffffa8f40e35bc80 EFLAGS: 00010286
Aug 01 22:21:08 srv01 kernel: RAX: 99128c3ff5cbeb12 RBX: 0000000000000000 RCX: 0000000000000000
Aug 01 22:21:08 srv01 kernel: RDX: 000000000000c7d7 RSI: 00000000006080c0 RDI: 00003150e421f690
Aug 01 22:21:08 srv01 kernel: RBP: 99128c3ff5cbeb12 R08: ffffc8f3ffddf690 R09: 0000000000000000
Aug 01 22:21:08 srv01 kernel: R10: fefefefefefefeff R11: 0000000000000fe0 R12: 00000000006080c0
Aug 01 22:21:08 srv01 kernel: R13: ffffffffa9a5771a R14: ffff97a3095d1080 R15: ffff97a31b567c80
Aug 01 22:21:08 srv01 kernel: FS:  00007fb169a8ae40(0000) GS:ffff97a31bbc0000(0000) knlGS:0000000000000000
Aug 01 22:21:08 srv01 kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Aug 01 22:21:08 srv01 kernel: CR2: 00007fb16957c210 CR3: 00000008986ea000 CR4: 00000000000006e0
Aug 01 22:21:08 srv01 kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Aug 01 22:21:08 srv01 kernel: DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Aug 01 22:21:46 srv01 named[891]: resolver priming query complete

Does anyone have an idea for me where I can start to isolate the problem?

with best
sven

So, I spent all day yesterday trying to isolate the problem. I was able to solve the problem, it is due to the kernel update of UCS (see below).

About the environment:

That it is only the browser was / is not quite right. As soon as many file operations take place on the server it crashes. The UCS runs under Proxmox (6.4) and has sufficient resources (12 core / 64GB RAM). The physical server is a Supermicro with 2 x Xennon Gold, 40 Core and 128GB RAM.

No changes have been made to either Proxmox or the client. On the UCS the kernel updates came recently:

* 4.19.0-21-amd64
* 4.19.0-20-amd64

These are the problem! If I start the UCS with the oldest kernel:

* 4.19.0-18-amd64

everything runs stable and as before. The kernel in between:

* 4.19.0-19-amd64

I have not tried.

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