Thanks Al. > -----Original Message----- > From: Al Viro [mailto:viro@xxxxxxxxxxxxxxxx] On Behalf Of Al Viro > Sent: Tuesday, August 27, 2013 8:43 AM > To: Liu, Chuansheng > Cc: Eric Dumazet; linux-fsdevel@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx > Subject: Re: [PATCH] Fix the race between the fget() and close() > > On Mon, Aug 26, 2013 at 11:56:43PM +0000, Liu, Chuansheng wrote: > > > Hell, might be buggered refcounting on descriptor table - binder is playing I also suspected binder do some strange thing there, but in the panic log, there is another process causes this case during vfs_read(), maybe it is not related with binder totally. <1>[ 392.669816] BUG: unable to handle kernel NULL pointer dereference at 00000020 <1>[ 392.678055] IP: [<c131c8a7>] vfs_read+0x97/0x160 > interesting games there. Try to reproduce that with > CONFIG_DEBUG_KMEMLEAK > and slab debugging turned on, see if you hit anything from those; if it's > more or less readily reproducible, I would start with that - too many > scenarios involve broken refcounting of one sort or another. It is not easy to hit, will try with CONFIG_DEBUG_KMEMLEAK and SLAB DEBUGGING on. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
