On Thu, Nov 24, 2011 at 11:44:06AM -0500, George Spelvin wrote: > It turned out the machine was quite recoverable and I've been running it without rebooting since then. > This includes several suspends to RAM and one to disk. > > So far, it seems pretty reproducible, but I suppose it could be a kernel bit flip. > (F***ing Intel not even *allowing* ECC in "consumer" chipsets...) > > I should probably add a debugging patch and reboot. Is there a debugging helper > for printing a dentry and vfsmount? d_path(); takes struct path *, pointer to buffer and buffer length, puts the pathname into the end of buffer and returns a pointer to the beginning of resulting string. I'd add (hell, maybe start with) printing this: file->f_path.dentry->d_inode inode file->f_mapping inode->i_mapping inode->i_mapping->host just to see whether it's open() callback resetting ->f_mapping to NULL or weird inode->i_mapping->host. All in case file->f_mapping->host == NULL just before the spot where it oopses. Getting pathname would be something like static char name[4096]; struct path path = {.mnt = mnt, .dentry = dentry}; char *p = d_path(&path, name, 4096); if (IS_ERR(p)) printk("[%d]", PTR_ERR(p)); else printk("'%s'", p); conditional on the same test. Said that, I'm not buying the theory of open assigning to ->f_mapping and screwing it up; all such assignments end up with ->i_mapping of *some* inode, as far as I can see from cursory grep over the tree. Just in case: do you have CONFIG_FS_POSIX_ACL set? -- 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