XPost: linux.debian.bugs.dist   
   From: carnil@debian.org   
      
   Control: reassign -1 src:chrony   
   Control: forcemerge 1127659 -1   
      
   Hi,   
      
   On Fri, Feb 20, 2026 at 02:20:00PM -0600, maney wrote:   
   > Package: linux-image-6.12.73+deb13-amd64   
   > Version: linux-image-6.12.73+deb13-amd64   
   > Severity: normal   
   >   
   > Observed on amd64 machines with both Bookworm (6.1.162) and Trixie (6.12.73)   
   > current security linux-image releases. Different CPU familys (Jaguar and   
   > Ryzen). Different chrony versions (4.3-2+deb12u1, 4.6.1-3).   
   >   
   > To observe problem, with security kernels installed, setup a PHC clock   
   > source for the existing I210 interface, eg.   
   >   
   > refclock PHC /dev/ptp0:extpps   
   >   
   > Observe error when starting chrony:   
   >   
   > chronyd[837]: Fatal error : Could not enable external PHC timestamping   
   >   
   > (wording may be different between the two systems, this was Trixie)   
   >   
   > Both work fine under previous kernels 6.1.159 and 6.12.73 (I do not   
   > guarantee there weren't any other versions released between these and the   
   > recent security, neither machine is exposed to the internet and so don't   
   > always get updated immediately.)   
   >   
   > In both cases chrony's use of the PHC for timestamping appears unimpaired by   
   > the kernels that fail the PHC refclock. The bookworm platform has linuxptp   
   > installed. phc_ctl and ts2phc work fine with either kernel.   
   >   
   > I left the severity at normal, but it's much more serious to a machine   
   > that's syncing to a PPS source like this.   
   >   
   > Workaround: roll back those security kernels, of course. And test any future   
   > releases for this issue, of course.   
      
   This is #1127659. Background the issue will not be fixed in src:linux   
   as the commit introducing this is considered a security fix, but the   
   maintainer of src:chrony will is preparing updates.   
      
   Regards,   
   Salvatore   
      
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