dns backend restart with adblock blocklist failed

[lemonadelemon]

Hello Guys!
For a few days now, the Adblock package has not been working and an error is displayed in the panel. The log shows the message in the title. The error with the same message also occurs when all lists are disabled and the whitelist and blacklist are cleared. Updating the package with dependencies and reinstalling them did not help. What could be the cause?

Here are the log entries:
Wed Feb 19 19:04:33 2025 user.info adblock-4.2.5-r1[2135]: adblock instance started ::: action: start, priority: 0, pid: 2135 Thu Feb 20 08:05:50 2025 user.err adblock-4.2.5-r1[2135]: dns backend restart with adblock blocklist failed Thu Feb 20 08:17:09 2025 user.info adblock-4.2.5-r1[7020]: adblock instance started ::: action: reload, priority: 0, pid: 7020 Thu Feb 20 08:18:09 2025 user.err adblock-4.2.5-r1[7020]: dns backend restart with adblock blocklist failed Thu Feb 20 10:18:09 2025 user.info adblock-4.2.5-r1[16130]: adblock instance started ::: action: reload, priority: 0, pid: 16130 Thu Feb 20 10:19:08 2025 user.err adblock-4.2.5-r1[16130]: dns backend restart with adblock blocklist failed

And this is my machine:
`OpenWrt 24.10-SNAPSHOT, r28432-7609571dcd

Build time: 2025-02-07 06:44 UTC
Cezary Jackiewicz, https://eko.one.pl

---

Machine: Netgear R6220
Uptime: 0d, 02:21:39
Load: 0.16 0.20 0.10
Flash: total: 12.7MB, free: 11.8MB, used: 2%
Memory: total: 116.6MB, free: 61.9MB, used: 46%
Leases: 8
lan: static, 192.168.1.1`

[dibdot]

Provide at least your adblock config and an adblock run with enabled debug output.

[lemonadelemon]

config adblock 'global'
option adb_enabled '1'
option adb_debug '0'
option adb_forcedns '0'
option adb_safesearch '0'
option adb_dnsfilereset '0'
option adb_mail '0'
option adb_report '0'
option adb_backup '1'
option adb_dns 'dnsmasq'
option adb_fetchutil 'uclient-fetch'
list adb_sources 'adaway'

Thu Feb 20 15:38:31 2025 user.info adblock-4.2.5-r1[29379]: adblock instance started ::: action: reload, priority: 0, pid: 29379
Thu Feb 20 15:38:33 2025 daemon.info dnsmasq[1]: exiting on receipt of SIGTERM
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: started, version 2.90 cachesize 1000
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: DNS service limited to local subnets
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: compile time options: IPv6 GNU-getopt no-DBus UBus no-i18n no-IDN DHCP no-DHCPv6 no-Lua TFTP no-conntrack no-ipset no-nftset no-auth no-cryptohash no-DNSSEC no-ID loop-detect inotify dumpfile
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: UBus support enabled: connected to system bus
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq-dhcp[1]: DHCP, IP range 192.168.1.100 -- 192.168.1.249, lease time 12h
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: using only locally-known addresses for test
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: using only locally-known addresses for onion
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: using only locally-known addresses for localhost
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: using only locally-known addresses for local
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: using only locally-known addresses for invalid
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: using only locally-known addresses for bind
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: using only locally-known addresses for lan
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: reading /tmp/resolv.conf.d/resolv.conf.auto
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: using nameserver 188.127.0.41#53
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: using nameserver 188.127.2.69#53
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: using only locally-known addresses for test
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: using only locally-known addresses for onion
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: using only locally-known addresses for localhost
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: using only locally-known addresses for local
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: using only locally-known addresses for invalid
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: using only locally-known addresses for bind
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: using only locally-known addresses for lan
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: read /etc/hosts - 12 names
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: read /tmp/hosts/dhcp.cfg01411c - 4 names
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq[1]: read /tmp/hosts/odhcpd - 2 names
Thu Feb 20 15:38:37 2025 daemon.info dnsmasq-dhcp[1]: read /etc/ethers - 0 addresses
Thu Feb 20 15:39:03 2025 daemon.info dnsmasq[1]: exiting on receipt of SIGTERM

[dibdot]

Still no adblock debug output, just dnsmasq stuff.
Edit: a typical debug output looks like that ...

root@One:~# logread -e "adblock"
Thu Feb 20 17:21:21 2025 user.debug adblock-4.2.5-r1[6013]: f_dns    ::: dns: dnsmasq, dns_dir: /tmp/dnsmasq.d, dns_file: adb_list.overall, dns_user: dnsmasq, dns_instance: 0, backup_dir: /mnt/data/adblock/backup, jail_dir: /tmp
Thu Feb 20 17:21:21 2025 user.debug adblock-4.2.5-r1[6013]: f_fetch  ::: fetch_util: /usr/bin/curl, fetch_parm:  --connect-timeout 20 --fail --silent --show-error --location -o
Thu Feb 20 17:21:21 2025 user.info adblock-4.2.5-r1[6013]: adblock instance started ::: action: start, priority: 10, pid: 6013
Thu Feb 20 17:21:22 2025 user.debug adblock-4.2.5-r1[6013]: f_list   ::: name: blacklist, mode: blacklist, cnt: 3, in_rc: 0, out_rc: 0
Thu Feb 20 17:21:22 2025 user.debug adblock-4.2.5-r1[6013]: f_list   ::: name: whitelist, mode: whitelist, cnt: 3, in_rc: 0, out_rc: 0
Thu Feb 20 17:21:22 2025 user.debug adblock-4.2.5-r1[6013]: f_list   ::: name: iplist, mode: iplist, cnt: 0, in_rc: 0, out_rc: 0
Thu Feb 20 17:21:22 2025 user.debug adblock-4.2.5-r1[6013]: f_list   ::: name: certpl, mode: restore, cnt: 41193, in_rc: 4, out_rc: 0
Thu Feb 20 17:21:22 2025 user.debug adblock-4.2.5-r1[6013]: f_list   ::: name: stevenblack, mode: restore, cnt: 133970, in_rc: 4, out_rc: 0
Thu Feb 20 17:21:23 2025 user.debug adblock-4.2.5-r1[6013]: f_list   ::: name: winspy, mode: restore, cnt: 347, in_rc: 4, out_rc: 0
Thu Feb 20 17:21:23 2025 user.debug adblock-4.2.5-r1[6013]: f_list   ::: name: -, mode: merge, cnt: 138111, in_rc: 4, out_rc: 0
Thu Feb 20 17:21:24 2025 user.debug adblock-4.2.5-r1[6013]: f_tld    ::: name: -, cnt: 138111, cnt_tld: 74949, cnt_rem: 74949
Thu Feb 20 17:21:24 2025 user.debug adblock-4.2.5-r1[6013]: f_list   ::: name: -, mode: final, cnt: 74949, in_rc: 4, out_rc: 0
Thu Feb 20 17:21:30 2025 user.debug adblock-4.2.5-r1[6013]: f_dnsup  ::: dns: dnsmasq, cache_cmd: -, lookup_cmd: /usr/bin/nslookup, lookup_domain: example.com, restart_rc: 0, dns_flush: 0, dns_timeout: 20, dns_pid: 6506, dns_cnt: 1, in_rc: 0, out_rc: 0
Thu Feb 20 17:21:30 2025 user.info adblock-4.2.5-r1[6013]: blocklist with overall 74.949 blocked domains loaded successfully (OpenWrt One, mediatek/filogic, OpenWrt 24.10-SNAPSHOT r28470-315facfce6 )

[lemonadelemon]

Sorry for my mistake. I hope this is what you meant:

Thu Feb 20 18:55:31 2025 user.debug adblock-4.2.5-r1[13216]: f_dns    ::: dns: dnsmasq, dns_dir: /tmp/dnsmasq.d, dns_file: adb_list.overall, dns_user: dnsmasq, dns_instance: 0, backup_dir: /tmp/adblock-Backup, jail_dir: /tmp
Thu Feb 20 18:55:31 2025 user.debug adblock-4.2.5-r1[13216]: f_fetch  ::: fetch_util: /bin/uclient-fetch, fetch_parm:  --timeout=20 -O
Thu Feb 20 18:55:35 2025 user.debug adblock-4.2.5-r1[13216]: f_dnsup  ::: dns: dnsmasq, cache_cmd: -, lookup_cmd: /usr/bin/nslookup, lookup_domain: example.com, restart_rc: 0, dns_flush: 0, dns_timeout: 20, dns_pid: , dns_cnt: 0, in_rc: 4, out_rc: 4
Thu Feb 20 18:55:35 2025 user.debug adblock-4.2.5-r1[13527]: f_dns    ::: dns: dnsmasq, dns_dir: /tmp/dnsmasq.d, dns_file: adb_list.overall, dns_user: dnsmasq, dns_instance: 0, backup_dir: /tmp/adblock-Backup, jail_dir: /tmp
Thu Feb 20 18:55:35 2025 user.debug adblock-4.2.5-r1[13527]: f_fetch  ::: fetch_util: /bin/uclient-fetch, fetch_parm:  --timeout=20 -O
Thu Feb 20 18:55:35 2025 user.info adblock-4.2.5-r1[13527]: adblock instance started ::: action: restart, priority: 0, pid: 13527
Thu Feb 20 18:56:04 2025 user.debug adblock-4.2.5-r1[13527]: f_dnsup  ::: dns: dnsmasq, cache_cmd: -, lookup_cmd: /usr/bin/nslookup, lookup_domain: example.com, restart_rc: 0, dns_flush: 0, dns_timeout: 20, dns_pid: 13846, dns_cnt: 21, in_rc: 0, out_rc: 4
Thu Feb 20 18:56:04 2025 user.debug adblock-4.2.5-r1[13527]: f_list   ::: name: blacklist, mode: blacklist, cnt: 0, in_rc: 0, out_rc: 0
Thu Feb 20 18:56:04 2025 user.debug adblock-4.2.5-r1[13527]: f_list   ::: name: whitelist, mode: whitelist, cnt: 1, in_rc: 0, out_rc: 0
Thu Feb 20 18:56:04 2025 user.debug adblock-4.2.5-r1[13527]: f_list   ::: name: iplist, mode: iplist, cnt: 0, in_rc: 0, out_rc: 0
Thu Feb 20 18:56:04 2025 user.debug adblock-4.2.5-r1[13527]: f_list   ::: name: adaway, mode: restore, cnt: 6540, in_rc: 4, out_rc: 0
Thu Feb 20 18:56:05 2025 user.debug adblock-4.2.5-r1[13527]: f_list   ::: name: -, mode: merge, cnt: 6540, in_rc: 4, out_rc: 0
Thu Feb 20 18:56:05 2025 user.debug adblock-4.2.5-r1[13527]: f_tld    ::: name: -, cnt: 6540, cnt_tld: 4289, cnt_rem: 4289
Thu Feb 20 18:56:05 2025 user.debug adblock-4.2.5-r1[13527]: f_list   ::: name: -, mode: final, cnt: 4289, in_rc: 4, out_rc: 0
Thu Feb 20 18:56:32 2025 user.debug adblock-4.2.5-r1[13527]: f_dnsup  ::: dns: dnsmasq, cache_cmd: -, lookup_cmd: /usr/bin/nslookup, lookup_domain: example.com, restart_rc: 0, dns_flush: 0, dns_timeout: 20, dns_pid: 14409, dns_cnt: 21, in_rc: 0, out_rc: 4
Thu Feb 20 18:56:32 2025 user.err adblock-4.2.5-r1[13527]: dns backend restart with adblock blocklist failed
Thu Feb 20 18:56:37 2025 user.debug adblock-4.2.5-r1[13527]: f_dnsup  ::: dns: dnsmasq, cache_cmd: -, lookup_cmd: /usr/bin/nslookup, lookup_domain: example.com, restart_rc: 0, dns_flush: 0, dns_timeout: 20, dns_pid: 14409, dns_cnt: 0, in_rc: 4, out_rc: 4

[dibdot]

OK, thanks. Please post the output of nslookup example.com (that's the default lookup/check domain). Most probably this lookup domain is blocked in your environment. Either you use a different domain or you set this check to “false” (adb_lookupdomain, see readme).

[lemonadelemon]

root@OpenWrt:~# nslookup example.com
Server:         127.0.0.1
Address:        127.0.0.1:53

** server can't find example.com: SERVFAIL

** server can't find example.com: SERVFAIL

[lemonadelemon]

Ok, changed it to "google.com", and now in log you can see:

Thu Feb 20 19:52:47 2025 user.debug adblock-4.2.5-r1[18968]: f_dns    ::: dns: dnsmasq, dns_dir: /tmp/dnsmasq.d, dns_file: adb_list.overall, dns_user: dnsmasq, dns_instance: 0, backup_dir: /tmp/adblock-Backup, jail_dir: /tmp
Thu Feb 20 19:52:47 2025 user.debug adblock-4.2.5-r1[18968]: f_fetch  ::: fetch_util: /bin/uclient-fetch, fetch_parm:  --timeout=20 -O
Thu Feb 20 19:52:51 2025 user.debug adblock-4.2.5-r1[18968]: f_dnsup  ::: dns: dnsmasq, cache_cmd: -, lookup_cmd: /usr/bin/nslookup, lookup_domain: google.com, restart_rc: 0, dns_flush: 0, dns_timeout: 20, dns_pid: , dns_cnt: 0, in_rc: 4, out_rc: 4
Thu Feb 20 19:52:51 2025 user.debug adblock-4.2.5-r1[19279]: f_dns    ::: dns: dnsmasq, dns_dir: /tmp/dnsmasq.d, dns_file: adb_list.overall, dns_user: dnsmasq, dns_instance: 0, backup_dir: /tmp/adblock-Backup, jail_dir: /tmp
Thu Feb 20 19:52:51 2025 user.debug adblock-4.2.5-r1[19279]: f_fetch  ::: fetch_util: /bin/uclient-fetch, fetch_parm:  --timeout=20 -O
Thu Feb 20 19:52:51 2025 user.info adblock-4.2.5-r1[19279]: adblock instance started ::: action: restart, priority: 0, pid: 19279
Thu Feb 20 19:52:57 2025 user.debug adblock-4.2.5-r1[19279]: f_dnsup  ::: dns: dnsmasq, cache_cmd: -, lookup_cmd: /usr/bin/nslookup, lookup_domain: google.com, restart_rc: 0, dns_flush: 0, dns_timeout: 20, dns_pid: 19598, dns_cnt: 0, in_rc: 0, out_rc: 0
Thu Feb 20 19:52:57 2025 user.debug adblock-4.2.5-r1[19279]: f_list   ::: name: blacklist, mode: blacklist, cnt: 0, in_rc: 0, out_rc: 0
Thu Feb 20 19:52:58 2025 user.debug adblock-4.2.5-r1[19279]: f_list   ::: name: whitelist, mode: whitelist, cnt: 1, in_rc: 0, out_rc: 0
Thu Feb 20 19:52:58 2025 user.debug adblock-4.2.5-r1[19279]: f_list   ::: name: iplist, mode: iplist, cnt: 0, in_rc: 0, out_rc: 0
Thu Feb 20 19:52:58 2025 user.debug adblock-4.2.5-r1[19279]: f_list   ::: name: adaway, mode: restore, cnt: 6540, in_rc: 4, out_rc: 0
Thu Feb 20 19:52:58 2025 user.debug adblock-4.2.5-r1[19279]: f_list   ::: name: -, mode: merge, cnt: 6540, in_rc: 4, out_rc: 0
Thu Feb 20 19:52:58 2025 user.debug adblock-4.2.5-r1[19279]: f_tld    ::: name: -, cnt: 6540, cnt_tld: 4289, cnt_rem: 4289
Thu Feb 20 19:52:58 2025 user.debug adblock-4.2.5-r1[19279]: f_list   ::: name: -, mode: final, cnt: 4289, in_rc: 4, out_rc: 0
Thu Feb 20 19:53:03 2025 user.debug adblock-4.2.5-r1[19279]: f_dnsup  ::: dns: dnsmasq, cache_cmd: -, lookup_cmd: /usr/bin/nslookup, lookup_domain: google.com, restart_rc: 0, dns_flush: 0, dns_timeout: 20, dns_pid: 19848, dns_cnt: 0, in_rc: 0, out_rc: 0
Thu Feb 20 19:53:04 2025 user.info adblock-4.2.5-r1[19279]: blocklist with overall 4.289 blocked domains loaded successfully (Netgear R6220, ramips/mt7621, OpenWrt 24.10-SNAPSHOT r28432-7609571dcd )

Thank you very much for your interest and help