On Wed, Aug 30, 2023 at 11:03:59AM +0000, Joel Fernandes (Google) wrote: > It is unsafe to dump vmalloc area information when trying to do so from > some contexts. Add a safer trylock version of the same function to do a > best-effort VMA finding and use it from vmalloc_dump_obj(). > > Reported-by: Zhen Lei <thunder.leizhen@xxxxxxxxxxxxxxx> > Cc: Paul E. McKenney <paulmck@xxxxxxxxxx> > Cc: rcu@xxxxxxxxxxxxxxx > Cc: Zqiang <qiang.zhang1211@xxxxxxxxx> > Signed-off-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx> Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> I once started writing something similar, but got distracted and the immediate problem got solved a different way. It does make me wonder if we couldn't make this tree RCU-safe, but that's obviously a much larger job.
