On Sun May 30 12:00:25 EDT 2010, x...@bouyapop.org wrote: > You also have to recompile vx library. > > Phil > > Brian L. Stuart wrote: > >> OK, somebody sent a hint that it > >> might make sense to take the -O3 out > >> of the make flags. Done. > >> > >> Result: I can now get through this command: > >> hget -v > >> http://plan9.bell-labs.com/plan9/download/plan9.iso.bz2>/tmp/iso.bz2 > >> |[2]aux/statusbar plan9.iso > >> > >> without an explosion. > >> > > > > This is weird. I just built 9vx on FreeBSD without > > the -O3. But instead of being more stable, that > > one crashed on startup, like Charles reported. > > Namely: > > > > 9vx panic: user fault: signo=11 addr=3850cb67 [useraddr=cb67] read=1 > > eip=80b973c esp=493ffac0 > > aborting, to dump core. > > > > With the -O3, the crashes are rare, and seem to be > > associated with heavy I/O.
you may be right, but it seems too easy to blame gcc. a better fit for the facts so far would seem to me that 9vx' locking is broken. the optimization may just put more pressure on broken locking. putting a couple of prints in the startup will also change timing. if you can eliminate or cause a crash by adding or removing prints, then you can be sure that there is a locking/timing problem in 9vx. although that doesn't prove that gcc is blameless, it would be a reasonable assumption. - erik
