XPost: linux.debian.bugs.dist   
   From: bastien.durel@geekwu.org   
      
   Source: linux   
   Version: 6.12.48+deb13-amd64   
   Severity: important   
   Tags: ipv6   
   X-Debbugs-Cc: debian-amd64@lists.debian.org   
   User: debian-amd64@lists.debian.org   
   Usertags: amd64   
      
   Dear Maintainer,   
      
   When I boot on the 6.12.48+deb13-amd64 version of the kernel, my GRE6 tunnels   
   stop to work, it seems that decapsulation fail   
      
   Rolling back to 6.12.63+deb13-amd64 make them work again, so I _think_ this is   
   not a configuration issue.   
      
   I have two GRE6 tunnels on which I run BGP sessions.   
      
   Here's a capture of the external interface, filtered on ip6[40] = 47   
      
   21:56:44.411270 IP6 (flowlabel 0x7759c, hlim 64, next-header unknown (60)   
   payload length: 92) 2001:41d0:302:2000::2144 > 2a0c:b641:6::: DSTOPT (opt_type   
   0x04: len=1)(padn) GREv0, Flags [none], length 84   
   	IP6 (class 0xc0, flowlabel 0x7759c, hlim 255, next-header TCP (6) payload   
   length: 40) 2a0c:b640:fffe::21:2834:2.47098 > 2a0c:b640:fffe::21:2834:1.179:   
   Flags [S], cksum 0xc046 (correct), seq 2822657693, win 65236, options [mss   
   1388,sackOK,TS val    
   903776896 ecr 0,nop,wscale 7], length 0   
   21:56:44.421735 IP6 (flowlabel 0xc3931, hlim 242, next-header unknown (60)   
   payload length: 92) 2a0c:b641:6:: > 2001:41d0:302:2000::2144: DSTOPT (opt_type   
   0x04: len=1)(padn) GREv0, Flags [none], length 84   
   	IP6 (class 0xc0, flowlabel 0xc3931, hlim 255, next-header TCP (6) payload   
   length: 40) 2a0c:b640:fffe::21:2834:1.179 > 2a0c:b640:fffe::21:2834:2.47098:   
   Flags [S.], cksum 0x03b1 (correct), seq 1998626730, ack 2822657694, win 64672,   
   options [mss 1388,   
   sackOK,TS val 911965588 ecr 903773822,nop,wscale 7], length 0   
      
   We can see the SYN sent by bird, and the SYN/ACK returned by the peer.   
   Meanwile, when capturing on the gre interfact itself, only the SYNs sent by my   
   side shows up   
      
   21:56:43.387145 IP6 (class 0xc0, flowlabel 0xd8556, hlim 255, next-header TCP   
   (6) payload length: 40) 2a0c:b640:fffe::21:2834:2.47098 > 2a0c:b   
   40:fffe::21:2834:1.179: Flags [S], cksum 0x1173 (incorrect -> 0xc446), seq   
   2822657693, win 65236, options [mss    
   1388,sackOK,TS val 903775872 ecr 0,nop,wscale 7], length 0   
   21:56:44.411239 IP6 (class 0xc0, flowlabel 0x7759c, hlim 255, next-header TCP   
   (6) payload length: 40) 2a0c:b640:fffe::21:2834:2.47098 > 2a0c:b   
   40:fffe::21:2834:1.179: Flags [S], cksum 0x1173 (incorrect -> 0xc046), seq   
   2822657693, win 65236, options [mss    
   1388,sackOK,TS val 903776896 ecr 0,nop,wscale 7], length 0   
   21:56:45.435116 IP6 (class 0xc0, flowlabel 0x9203f, hlim 255, next-header TCP   
   (6) payload length: 40) 2a0c:b640:fffe::21:2834:2.47098 > 2a0c:b   
   40:fffe::21:2834:1.179: Flags [S], cksum 0x1173 (incorrect -> 0xbc46), seq   
   2822657693, win 65236, options [mss    
   1388,sackOK,TS val 903777920 ecr 0,nop,wscale 7], length 0   
      
   ICMP inside the tunnels behave the same (seen from the outer interface, not on   
   the GRE one)   
      
   Regards   
      
   -- System Information:   
   Debian Release: 13.3   
     APT prefers stable-security   
     APT policy: (500, 'stable-security'), (500, 'stable')   
   Architecture: amd64 (x86_64)   
      
   Kernel: Linux 6.12.63+deb13-amd64 (SMP w/1 CPU thread; PREEMPT)   
   Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not   
   set   
   Shell: /bin/sh linked to /usr/bin/dash   
   Init: systemd (via /run/systemd/system)   
   LSM: AppArmor: enabled   
      
   Versions of packages linux-image-6.12.69+deb13-amd64 depends on:   
   ii  initramfs-tools [linux-initramfs-tool]  0.148.3   
   ii  kmod                                    34.2-2   
   ii  linux-base                              4.12   
      
   -- Package-specific info:   
   ** Model information   
   sys_vendor: OpenStack Foundation   
   product_name: OpenStack Nova   
   product_version: 19.3.2   
   chassis_vendor: QEMU   
   chassis_version: pc-i440fx-9.2   
   bios_vendor: SeaBIOS   
   bios_version: 1.16.3-debian-1.16.3-2~bpo12+1   
      
   ** Configuration for modprobe:   
   blacklist pcspkr   
   blacklist arkfb   
   blacklist aty128fb   
   blacklist atyfb   
   blacklist radeonfb   
   blacklist cirrusfb   
   blacklist cyber2000fb   
   blacklist kyrofb   
   blacklist matroxfb_base   
   blacklist mb862xxfb   
   blacklist neofb   
   blacklist pm2fb   
   blacklist pm3fb   
   blacklist s3fb   
   blacklist savagefb   
   blacklist sisfb   
   blacklist tdfxfb   
   blacklist tridentfb   
   blacklist vt8623fb   
   options snd_pcsp index=-2   
   options cx88_alsa index=-2   
   options snd_atiixp_modem index=-2   
   options snd_intel8x0m index=-2   
   options snd_via82xx_modem index=-2   
   options bonding max_bonds=0   
   options dummy numdummies=0   
   options ifb numifbs=0   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)