Re: linux-next: Tree for Jan 20 -- Kernel panic - Unable to mount root fs

On Wed, Jan 21, 2015 at 11:16:23AM -0500, Paul Moore wrote: > On Wednesday, January 21, 2015 04:54:07 PM Sabrina Dubroca wrote: >> 2015-01-21, 16:39:12 +0100, Thierry Reding wrote: >>> That doesn't seem to help, at least in my case. >> >> Same here. > > Okay, thanks for trying. Sorry that didn't resolve things. > >> Well, it's probably not an audit issue. I tried audit=0 on the >> commandline, and I just rebuilt a kernel with CONFIG_AUDIT=n, and it's >> still panicing. This should have fixed any audit-related issue, >> right? > > Most likely. Back to the code I go ... FWIW, I really wonder if populate_rootfs() (run ultimately from kernel_init(), by way of kernel_init_freeable(), do_basic_setup() and do_initcalls()) ends up with some side effects as far as struct filename are concerned... Note that if we _ever_ hit reuse logics there, we are going to get bogus matches asoddingplenty - *all* those sys_mkdir(), etc. are going to be with filenames in the same reused buffer. So if anything in there leaks from one call to another, we are going to have a mess on hands. Another place where that can be a problem is devtmpfs - there's a kernel thread doing actual mkdir, mknod, etc. in that abomination and if _that_ ends up accumulating aushit entries, we'll end up with interesting problems. Folks, could you print the value of audit_dummy_context() in populate_rootfs() and in drivers/base/devtmpfs.c:devtmpfsd()?