Bug #2287

Updated by Anonymous over 4 years ago



 After having experienced a few panics, the root filesystem is 
 no longer able to be mounted, even in read-only mode: 


 (booted from a USB stick) 
 # mount -thammer -o ro /dev/da0s1d /mnt 
 HAMMER(ROOT) recovery check seqno=3364b54c 
 HAMMER(ROOT) Illegal UNDO TAIL signature at 300000001967c000 
 HAMMER(ROOT) recovery failure during seqno fwdscan 
 HAMMER(ROOT) recovery complete 
 Failed to recover HAMMER filesystem on mount 
 hammer: mount    on /mnt: Input/output error 


 I haven't tried `hammer recover' yet, as I have no idea what it does. 
 Is there anything I can do to recover from this situation?    This is 
 a machine dedicated to testing DragonFly stability, so I can install 
 from scratch in the worst case. 
 The error message looks similar to the one described in issue1984, 
 but in this case even R/O mount fails. 


 The current kernel is built from 4f459, and it occasionally panics 
 even under almost no CPU or disk load.    It could be a hardware failure, 
 but I couldn't find any indication of it as far as I watched the console 
 while it booted with the USB stick. 
 The previous kernel was built from 190f1b64, and it survived 10 days 
 without panic under pbulk load. 


 Best Regards, 
 YONETANI Tomokazu.