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

[David Holland <dholland-current%netbsd.org@localhost>]

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.)

-- 
David A. Holland
dholland%netbsd.org@localhost