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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Alejandro Olivan Alvarez Cc: 1130336@bugs.debian.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, regressions@lists.linux.dev, stable@vger.kernel.org References: <177349610461.3071718.4083978280323144323@eldamar.lan> Content-Language: en-US From: Fernando Fernandez Mancera In-Reply-To: <177349610461.3071718.4083978280323144323@eldamar.lan> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[99.99%]; SUSPICIOUS_RECIPS(1.50)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FUZZY_RATELIMITED(0.00)[rspamd.com]; ARC_NA(0.00)[]; RCPT_COUNT_TWELVE(0.00)[17]; FREEMAIL_TO(0.00)[debian.org,netfilter.org,strlen.de,nwl.cc,davemloft.net,google.com,kernel.org,redhat.com,gmail.com]; MIME_TRACE(0.00)[0:+]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; RCVD_TLS_ALL(0.00)[]; DKIM_TRACE(0.00)[suse.de:+]; RCVD_COUNT_TWO(0.00)[2]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; DNSWL_BLOCKED(0.00)[2a07:de40:b281:104:10:150:64:97:from,2a07:de40:b281:106:10:150:64:167:received]; TAGGED_RCPT(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; ASN(0.00)[asn:32098, ipnet:2800::/6, country:US]; RCVD_VIA_SMTP_AUTH(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns] X-Rspamd-Action: no action X-Spam-Flag: NO X-Spam-Score: -3.01 X-Spam-Level: X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Rspamd-Queue-Id: 9552C4D205 Hi, On 3/14/26 3:03 PM, Salvatore Bonaccorso wrote: > Control: forwarded -1 https://lore.kernel.org/regressions/177349610461.3071718.4083978280323144323@eldamar.lan > Control: tags -1 + upstream > > Hi > > In Debian, in https://bugs.debian.org/1130336, Alejandro reported that > after updates including 69894e5b4c5e ("netfilter: nft_connlimit: > update the count if add was skipped"), when the following rule is set > > iptables -A INPUT -p tcp -m connlimit --connlimit-above 111 -j REJECT --reject-with tcp-reset > > connections get stuck accordingly, it can be easily reproduced by: > > # iptables -A INPUT -p tcp -m connlimit --connlimit-above 111 -j REJECT --reject-with tcp-reset > # nft list ruleset > # Warning: table ip filter is managed by iptables-nft, do not touch! > table ip filter { > chain INPUT { > type filter hook input priority filter; policy accept; > ip protocol tcp xt match "connlimit" counter packets 0 bytes 0 reject with tcp reset > } > } > # wget -O /dev/null https://git.kernel.org/torvalds/t/linux-7.0-rc3.tar.gz > --2026-03-14 14:53:51-- https://git.kernel.org/torvalds/t/linux-7.0-rc3.tar.gz > Resolving git.kernel.org (git.kernel.org)... 172.105.64.184, 2a01:7e01:e001:937:0:1991:8:25 > Connecting to git.kernel.org (git.kernel.org)|172.105.64.184|:443... connected. > HTTP request sent, awaiting response... 301 Moved Permanently > Location: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/snapshot/linux-7.0-rc3.tar.gz [following] > --2026-03-14 14:53:51-- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/snapshot/linux-7.0-rc3.tar.gz > Reusing existing connection to git.kernel.org:443. > HTTP request sent, awaiting response... 200 OK > Length: unspecified [application/x-gzip] > Saving to: ‘/dev/null’ > > /dev/null [ <=> ] 248.03M 51.9MB/s in 5.0s > > 2026-03-14 14:53:56 (49.3 MB/s) - ‘/dev/null’ saved [260080129] > > # wget -O /dev/null https://git.kernel.org/torvalds/t/linux-7.0-rc3.tar.gz > --2026-03-14 14:53:58-- https://git.kernel.org/torvalds/t/linux-7.0-rc3.tar.gz > Resolving git.kernel.org (git.kernel.org)... 172.105.64.184, 2a01:7e01:e001:937:0:1991:8:25 > Connecting to git.kernel.org (git.kernel.org)|172.105.64.184|:443... failed: Connection timed out. > Connecting to git.kernel.org (git.kernel.org)|2a01:7e01:e001:937:0:1991:8:25|:443... failed: Network is unreachable. > > Before the 69894e5b4c5e ("netfilter: nft_connlimit: update the count > if add was skipped") commit this worked. > Thanks for the report. I have reproduced this on upstream kernel. I am working on it. Thanks, Fernando. > #regzbot introduced: 69894e5b4c5e28cda5f32af33d4a92b7a4b93b0e > #regzbot link: https://bugs.debian.org/1130336 > > Regards, > Salvatore >