New (?) MDNS spam - How to stop?

English Install/Boot/Login
#1

Hy!

An older install of TW KDE with a taskbar widget shows spikes of outgoing traffic (320 b) every second or so, which I didn’t see (recognize?) in the past.

The command

ss

and alike with option -t or -u or | less doesn’t give ANY output at all (blank, can’t be stopped with CTRL+C), very strange.

So I started Wireshark and there I see lots of

8839    19.428418329    10.10.110.139    224.0.0.251    MDNS    76    Standard query 0x0000 PTR _rtsp._tcp.local, "QM" question

Avahi is disabled in Yast -> Services, so what could I do more to stop this?

#2

…apparantly Pidgin is the source of this spam, even if connected to no account, but open in the background.

Sorry for that!

Then the only question is: Why is

ss

(run in root console) not giving any output?

#3

btw ss command doesn’t work on this machine in a normal user console either, while on on other TW/Leap installs it gives the expected output. How come?

#4

With htop I found a lot of ss processes in status D, so after a reboot I did again ss and got “Killed”

user@dell6:~> ss
Killed
user@dell6:~> ss

…and only after the second ss the console doesn’t responded. What’s that?!?

#5

Being a bit curious (I did not use ss, but used netstat for such things), I called ss a few times from konsole with a KDE session. No problems seen. It gives a rather long list and the stops. This can be repeated. This observation does not really help you, except that it tells you it is not a general problem.

#6

In dmesg I get upon starting ss


   63.215947] BUG: unable to handle page fault for address: ffffffffffffffc8
   63.215957] #PF: supervisor read access in kernel mode
   63.215960] #PF: error_code(0x0000) - not-present page
   63.215963] PGD 165615067 P4D 165615067 PUD 165617067 PMD 0 
   63.215970] Oops: 0000 #1] PREEMPT SMP PTI
   63.215974] CPU: 0 PID: 2540 Comm: ss Tainted: G           O      5.19.8-1-default #1 openSUSE Tumbleweed cfee37eadc5a540a2720ec5a9e55d8deb9565ab8
   63.215981] Hardware name: Dell Inc. Precision WorkStation T7500  /06FW8P, BIOS A18 10/15/2018
   63.215985] RIP: 0010:raw_diag_dump+0x104/0x200 [raw_diag]
   63.215991] Code: 89 c5 49 8b 5e 08 89 dd 83 e5 01 0f 85 ff 00 00 00 4c 89 74 24 08 45 89 e6 89 14 24 eb 0c 48 8b 1b f6 c3 01 0f 85 80 00 00 00 <4c> 3b 7b c8 75 ee 44 39 f5 7c 6a 41 0f b6 45 00 66 39 43 a8 75 5f
   63.215997] RSP: 0018:ffffb4f38368b9a0 EFLAGS: 00010246
   63.216001] RAX: ffff8fcb60245810 RBX: 0000000000000000 RCX: ffff8fccb0fc9348
   63.216004] RDX: 0000000000000000 RSI: ffffffffb0278ec0 RDI: ffffffffb0278ec0
   63.216008] RBP: 0000000000000000 R08: ffffffffaf667cc0 R09: 0000000000000006
   63.216011] R10: ffffdcfcc648f800 R11: 0000000000000090 R12: 0000000000000000
   63.216014] R13: ffff8fcb60245810 R14: 0000000000000000 R15: ffffffffb026fdc0
   63.216018] FS:  00007f522d85c800(0000) GS:ffff8fd03ee00000(0000) knlGS:0000000000000000
   63.216022] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
   63.216026] CR2: ffffffffffffffc8 CR3: 000000023096e002 CR4: 00000000000206f0
   63.216030] Call Trace:
   63.216033]  <TASK>
   63.216038]  __inet_diag_dump+0x3c/0xb0 [inet_diag 6e5a23768fff3f0f8fbb1d3bede71750b73bbc75]
   63.216045]  netlink_dump+0x123/0x310
   63.216052]  __netlink_dump_start+0x1b6/0x2f0
   63.216057]  inet_diag_handler_cmd+0xb7/0xe0 [inet_diag 6e5a23768fff3f0f8fbb1d3bede71750b73bbc75]
   63.216063]  ? inet_diag_dump_start_compat+0x10/0x10 [inet_diag 6e5a23768fff3f0f8fbb1d3bede71750b73bbc75]
   63.216069]  ? inet_diag_dump_compat+0xc0/0xc0 [inet_diag 6e5a23768fff3f0f8fbb1d3bede71750b73bbc75]
   63.216075]  ? inet_diag_unregister+0x40/0x40 [inet_diag 6e5a23768fff3f0f8fbb1d3bede71750b73bbc75]
   63.216082]  sock_diag_rcv_msg+0x114/0x140
   63.216089]  ? sock_diag_bind+0x50/0x50
   63.216093]  netlink_rcv_skb+0x51/0x100
   63.216098]  sock_diag_rcv+0x24/0x40
   63.216102]  netlink_unicast+0x239/0x380
   63.216106]  netlink_sendmsg+0x250/0x4c0
   63.216110]  sock_sendmsg+0x5f/0x70
   63.216117]  ____sys_sendmsg+0x22e/0x270
   63.216121]  ? import_iovec+0x17/0x20
   63.216126]  ? sendmsg_copy_msghdr+0x7b/0xa0
   63.216131]  ___sys_sendmsg+0x80/0xc0
   63.216136]  ? __rseq_handle_notify_resume+0x362/0x480
   63.216143]  ? __sys_recvmsg+0x54/0xa0
   63.216147]  __sys_sendmsg+0x57/0xa0
   63.216152]  do_syscall_64+0x5b/0x80
   63.216158]  ? do_syscall_64+0x67/0x80
   63.216162]  ? syscall_exit_to_user_mode+0x17/0x40
   63.216167]  ? do_syscall_64+0x67/0x80
   63.216171]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
   63.216177] RIP: 0033:0x7f522da29524
   63.216181] Code: ff eb b7 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 90 90 80 3d 7d c4 0d 00 00 74 13 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 48 83 ec 28 89 54 24 1c 48 89
   63.216187] RSP: 002b:00007fffec05efc8 EFLAGS: 00000202 ORIG_RAX: 000000000000002e
   63.216191] RAX: ffffffffffffffda RBX: 000000000000000a RCX: 00007f522da29524
   63.216195] RDX: 0000000000000000 RSI: 00007fffec05f0b0 RDI: 0000000000000003
   63.216198] RBP: 00000000000000ff R08: 0000000000000004 R09: 0000000000000001
   63.216201] R10: 00007fffec05ef9c R11: 0000000000000202 R12: 0000000000000003
   63.216205] R13: 00007fffec05f030 R14: 0000000003010014 R15: 00007fffec05f170
   63.216210]  </TASK>
   63.216221] Modules linked in: raw_diag inet_diag unix_diag wireguard curve25519_x86_64 libchacha20poly1305 chacha_x86_64 poly1305_x86_64 libcurve25519_generic libchacha ip6_udp_tunnel udp_tunnel af_packet nft_objref nf_conntrack_netbios_ns nf_conntrack_broadcast nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_tables ebtable_nat ebtable_broute iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c iptable_mangle iptable_raw iptable_security rfkill ip_set nfnetlink ebtable_filter ebtables ip6_tables iptable_filter bpfilter vboxnetadp(O) vboxnetflt(O) qrtr vboxdrv(O) snd_seq_dummy snd_seq_oss snd_emu10k1_synth snd_emux_synth snd_seq_midi_emul snd_seq_virmidi snd_seq_midi snd_seq_midi_event snd_seq dmi_sysfs iTCO_wdt intel_pmc_bxt gpio_ich iTCO_vendor_support ppdev stv6110x intel_powerclamp coretemp lnbp21 dell_smm_hwmon kvm_intel kvm dell_wmi ledtrig_audio dell_smbios dcdbas
   63.216267]  irqbypass pcspkr sparse_keymap dell_wmi_descriptor wmi_bmof stv090x ddbridge dvb_core joydev mc i2c_i801 i2c_smbus snd_hda_codec_hdmi tg3 snd_hda_intel lpc_ich snd_intel_dspcfg snd_intel_sdw_acpi libphy snd_emu10k1 snd_hda_codec snd_util_mem snd_ac97_codec snd_hda_core ac97_bus snd_rawmidi snd_hwdep snd_seq_device i7core_edac snd_pcm snd_timer snd soundcore parport_pc parport tiny_power_button raid1 md_mod acpi_cpufreq mptctl fuse configfs ip_tables x_tables ext4 mbcache jbd2 hid_cherry hid_generic usbhid crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel nouveau aesni_intel crypto_simd cryptd serio_raw mptsas xhci_pci video xhci_pci_renesas sr_mod cdrom scsi_transport_sas drm_ttm_helper xhci_hcd uhci_hcd ehci_pci ttm ehci_hcd mxm_wmi mptscsih mptbase drm_display_helper usbcore firewire_ohci cec firewire_core rc_core crc_itu_t wmi button sg dm_multipath dm_mod scsi_dh_rdac scsi_dh_emc scsi_dh_alua msr
   63.216358] Unloaded tainted modules: pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1 pcc_cpufreq():1
   63.216438] CR2: ffffffffffffffc8
   63.216447] --- end trace 0000000000000000 ]---
   63.216455] RIP: 0010:raw_diag_dump+0x104/0x200 [raw_diag]
   63.216465] Code: 89 c5 49 8b 5e 08 89 dd 83 e5 01 0f 85 ff 00 00 00 4c 89 74 24 08 45 89 e6 89 14 24 eb 0c 48 8b 1b f6 c3 01 0f 85 80 00 00 00 <4c> 3b 7b c8 75 ee 44 39 f5 7c 6a 41 0f b6 45 00 66 39 43 a8 75 5f
   63.216476] RSP: 0018:ffffb4f38368b9a0 EFLAGS: 00010246
   63.216485] RAX: ffff8fcb60245810 RBX: 0000000000000000 RCX: ffff8fccb0fc9348
   63.216494] RDX: 0000000000000000 RSI: ffffffffb0278ec0 RDI: ffffffffb0278ec0
   63.216502] RBP: 0000000000000000 R08: ffffffffaf667cc0 R09: 0000000000000006
   63.216511] R10: ffffdcfcc648f800 R11: 0000000000000090 R12: 0000000000000000
   63.216519] R13: ffff8fcb60245810 R14: 0000000000000000 R15: ffffffffb026fdc0
   63.216527] FS:  00007f522d85c800(0000) GS:ffff8fd03ee00000(0000) knlGS:0000000000000000
   63.216537] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
   63.216545] CR2: ffffffffffffffc8 CR3: 000000023096e002 CR4: 00000000000206f0
   63.216554] note: ss[2540] exited with preempt_count 1



radeon.agpmode=-1

doesn’t help, as suggested here

https://bugzilla.kernel.org/show_bug.cgi?id=206697

#7

Do you think this has anything to do with your subject?

#8

…the thread switched a little. I don’t know if these things are related…

#9

People will not see that (except me, but I am an exception). Better start a new thread with a good title about what is now the subject. You can always post a link to this thread if you think that is needed.