Issue #2971 has been updated by liweitianux.

Status changed from Feedback to Resolved

peeter, thank you for providing more information on this issue.

By the way, I've been running DragonFly BSD with HAMMER1 on an old machine for 
the last ~2 years, and never see such an issue or similar ones.

Also, DragonFly BSD has undergone various major changes since then, so this 
issue is somewhat irrelevant.  Let's close it now.


Bug #2971: kernel 4.7: buildworld causes panic: Bad link elm 0xffffffe1c766d500 
prev->next != elm

* Author: peeter
* Status: Resolved
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
The panic happened while doing buildworld. I am not entirely sure that the 
panic is not caused by a hardware error since prior to the panic two CRC errors 
showed up in /var/log/messages. On the other hand, it seems they might not be 
caused by a hardware error since prior to the panic I had seen CRC errors a 
couple of times and reinstalling the system got rid of them. In more detail, 
the machine has gone the following cycle of couple of times: 

1 - system has a panic (related to the kernel module I'm developing)
2 - hammer checkmap starts reporting errors occasionally
3 - then CRC errors show up /var/log/messages
4 - re-install the system and all errors vanish
5 - go back to 1

However, the last time after step 3 "make buildworld" led to this panic. 

hammer-crc-error-crash.txt (9.48 KB)

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