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Date: Tue, 20 Jan 2015 20:01:26 -0800 From: Guenter Roeck <linux@...ck-us.net> To: Al Viro <viro@...IV.linux.org.uk> CC: Paul Moore <pmoore@...hat.com>, Sabrina Dubroca <sd@...asysnail.net>, Stephen Rothwell <sfr@...b.auug.org.au>, linux-next@...r.kernel.org, linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-audit@...hat.com, Richard Guy Briggs <rgb@...hat.com> Subject: Re: linux-next: Tree for Jan 20 -- Kernel panic - Unable to mount root fs On 01/20/2015 07:36 PM, Al Viro wrote: > On Tue, Jan 20, 2015 at 06:44:34PM -0800, Guenter Roeck wrote: >>> The shit hits the fan earlier - when we end up missing /dev. There are >>> two places where it could've been created (depending on CONFIG_BLK_DEV_INITRD); >>> sys_mkdir(collected, mode); >>> in init/initramfs.c (line 353 in linux-next) and >>> err = sys_mkdir((const char __user __force *) "/dev", 0755); >>> in init/noinitramfs.c (line 32). The latter would've screamed on failure; >>> could you printk of collected (%s), mode (%o) and return value (%d) in the >>> former and see what happens? >>> >> >> sys_mkdir .:40775 returned -17 >> sys_mkdir usr:40775 returned 0 >> sys_mkdir usr/lib:40775 returned -2 >> sys_mkdir usr/share:40755 returned -2 >> sys_mkdir usr/share/udhcpc:40755 returned -2 >> sys_mkdir usr/bin:40775 returned -2 >> sys_mkdir usr/sbin:40775 returned -2 >> 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 -2 >> sys_mkdir lib/modules/3.9.2:40775 returned -2 >> sys_mkdir lib/modules/3.9.2/kernel:40775 returned -2 >> >> with >> int err = sys_mkdir(collected, mode); >> pr_info("sys_mkdir %s:%o returned %d\n", collected, mode, err); >> added in init/initramfs.c. > > Just what is lib/modules/3.9.2 doing there? In any case, I think I have at Artifact from when I created the root file system (which apparently was with 3.9.2). It is irrelevant for my testing, at least so far, so I never bothered fixing it. > least a plausible direction for digging. Look: > > diff --git a/fs/namei.c b/fs/namei.c > index 323957f..c7d107c 100644 > --- a/fs/namei.c > +++ b/fs/namei.c 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. Guenter -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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