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

2015-01-21, 04:36:38 +0000, Al Viro wrote: > On Tue, Jan 20, 2015 at 08:01:26PM -0800, Guenter Roeck wrote: >> With this patch: >> >> sys_mkdir .:40775 returned -17 >> sys_mkdir usr:40775 returned 0 >> sys_mkdir usr/lib:40775 returned 0 >> sys_mkdir usr/share:40755 returned 0 >> sys_mkdir usr/share/udhcpc:40755 returned 0 >> sys_mkdir usr/bin:40775 returned 0 >> sys_mkdir usr/sbin:40775 returned 0 >> sys_mkdir mnt:40775 returned 0 >> sys_mkdir proc:40775 returned 0 >> sys_mkdir root:40775 returned 0 >> sys_mkdir lib:40775 returned 0 >> sys_mkdir lib/modules:40775 returned 0 >> ... >> >> and the problem is fixed. This patch also works for me. > ... except that it simply confirms that something's fishy with getname_kernel() > of ->name of struct filename returned by getname(). IOW, I still do not > understand the mechanism of breakage there. I'm not so sure about that. I tried to copy name to a new string in do_path_lookup and that didn't help. Now, I've removed the putname(filename); line from do_path_lookup and I don't get the panic. And BTW, I added Guenter's debugging to init/initramfs.c and got: sys_mkdir dev:40755 returned 0 sys_mkdir root:40700 returned 0 even if it ends up panic'ing.