Re: panic: "pb->pb_pathcopyuses == 0" failed (sys_rename)

[Frank Kardel <kardel%netbsd.org@localhost>]

I changed the asserts - whjle testing I was experiencing many other 
crashes - so I restarted with a fresh tree - so far it seems to be stable.
I'll keep an eye on it though.

Frank

On 12/28/12 09:11, David Holland wrote:
> On Thu, Dec 27, 2012 at 02:42:17PM +0100, Frank Kardel wrote:
>   >  When booting a 20121225 kernel running a 6.99.5 userland
>   >  I get
>   >
>   >  panic: kernel diagnostic assertion "pb->pb_pathcopyuses == 0"
>   >  failed: file "/usr/src/sys/kern/vfs_lookup.c", line 279
>   >  cpu0: Begin traceback...
>   >  kern_assert() at netbsd:kern_assert+0x48
>   >  pathbuf_destroy() at netbsd:pathbuf_destroy+0x6c
>   >  do_sys_renameat() at netbsd:do_sys_renameat+0x82
>   >  sys_rename() at netbsd:sys_rename+0x25
>   >  syscall() at netbsd:syscall+0x94
>   >  --- syscall (number 128) ---
>   >  7f7ff36396da:
>   >  cpu0: End traceback...
>   >
>   >  when logging in kde.
>   >
>   >  Any clues?
>
> My first guess would be that the openat changes introduced a refcount
> leak, but it could also just be a broken error path that hasn't been
> seen before.
>
> Are you in a position to get a ktrace covering the offending syscall?
> (You can change the assertion to a printf so it doesn't crash; the
> worst it's likely to do is leak memory.)