Messages in this thread | | | Date | Wed, 28 Apr 2010 18:33:59 -0500 | Subject | Re: 2.6.33.3-rt16 Oops caused by umount | From | Xianghua Xiao <> |
| |
On Wed, Apr 28, 2010 at 4:46 PM, Thomas Gleixner <tglx@linutronix.de> wrote: > On Wed, 28 Apr 2010, Xianghua Xiao wrote: >> On Wed, Apr 28, 2010 at 3:22 PM, Thomas Gleixner <tglx@linutronix.de> wrote: >> > >> > Can you please decode the code lines with >> > >> > # addr2line -e vmlinux 0xc009ca1c 0xc009c9cc >> > >> > You need to enable CONFIG_DEBUG_INFO to get real line numbers. >> >> # reboot >> # Oops: Kernel access of bad area, sig: 11 [#1] >> PREEMPT 834x SYS >> Modules linked in: >> NIP: c009ded8 LR: c009de88 CTR: 00000000 > > Again. Can you please decode the code lines with > > # addr2line -e vmlinux 0xc009ded8 0xc009de88 > > Please run the above shell command in the directory where your kernel > compile output resides. If you compiled with O=BUILD_DIR then cd to > $BUILD_DIR otherwise you will find vmlinux in the root of your kernel > source tree. Please provide the output. > > Thanks, > > tglx >
here it is, just in case I also attached the source file related: addr2line -e vmlinux c009ded8 c009de88 /home/xxiao/xxiao/linux-2.6.33.3/fs/file_table.c:436 /home/xxiao/xxiao/linux-2.6.33.3/fs/file_table.c:440
thanks, /* * linux/fs/file_table.c * * Copyright (C) 1991, 1992 Linus Torvalds * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) */
#include <linux/string.h> #include <linux/slab.h> #include <linux/file.h> #include <linux/fdtable.h> #include <linux/init.h> #include <linux/module.h> #include <linux/fs.h> #include <linux/security.h> #include <linux/eventpoll.h> #include <linux/rcupdate.h> #include <linux/mount.h> #include <linux/capability.h> #include <linux/cdev.h> #include <linux/fsnotify.h> #include <linux/sysctl.h> #include <linux/percpu_counter.h> #include <linux/ima.h> #include <linux/percpu.h>
#include <asm/atomic.h>
#include "internal.h"
/* sysctl tunables... */ struct files_stat_struct files_stat = { .max_files = NR_FILE };
static DEFINE_PER_CPU(spinlock_t, files_cpulock);
/* SLAB cache for file structures */ static struct kmem_cache *filp_cachep __read_mostly;
static struct percpu_counter nr_files __cacheline_aligned_in_smp;
static inline void file_free_rcu(struct rcu_head *head) { struct file *f = container_of(head, struct file, f_u.fu_rcuhead);
put_cred(f->f_cred); kmem_cache_free(filp_cachep, f); }
static inline void file_free(struct file *f) { percpu_counter_dec(&nr_files); file_check_state(f); call_rcu(&f->f_u.fu_rcuhead, file_free_rcu); }
/* * Return the total number of open files in the system */ static int get_nr_files(void) { return percpu_counter_read_positive(&nr_files); }
/* * Return the maximum number of open files in the system */ int get_max_files(void) { return files_stat.max_files; } EXPORT_SYMBOL_GPL(get_max_files);
/* * Handle nr_files sysctl */ #if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS) int proc_nr_files(ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { files_stat.nr_files = get_nr_files(); return proc_dointvec(table, write, buffer, lenp, ppos); } #else int proc_nr_files(ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { return -ENOSYS; } #endif
/* Find an unused file structure and return a pointer to it. * Returns NULL, if there are no more free file structures or * we run out of memory. * * Be very careful using this. You are responsible for * getting write access to any mount that you might assign * to this filp, if it is opened for write. If this is not * done, you will imbalance int the mount's writer count * and a warning at __fput() time. */ struct file *get_empty_filp(void) { const struct cred *cred = current_cred(); static int old_max; struct file * f;
/* * Privileged users can go above max_files */ if (get_nr_files() >= files_stat.max_files && !capable(CAP_SYS_ADMIN)) { /* * percpu_counters are inaccurate. Do an expensive check before * we go and fail. */ if (percpu_counter_sum_positive(&nr_files) >= files_stat.max_files) goto over; }
f = kmem_cache_zalloc(filp_cachep, GFP_KERNEL); if (f == NULL) goto fail;
percpu_counter_inc(&nr_files); if (security_file_alloc(f)) goto fail_sec;
INIT_LIST_HEAD(&f->f_u.fu_list); atomic_long_set(&f->f_count, 1); rwlock_init(&f->f_owner.lock); f->f_cred = get_cred(cred); spin_lock_init(&f->f_lock); eventpoll_init_file(f); /* f->f_version: 0 */ return f;
over: /* Ran out of filps - report that */ if (get_nr_files() > old_max) { printk(KERN_INFO "VFS: file-max limit %d reached\n", get_max_files()); old_max = get_nr_files(); } goto fail;
fail_sec: file_free(f); fail: return NULL; }
/** * alloc_file - allocate and initialize a 'struct file' * @mnt: the vfsmount on which the file will reside * @dentry: the dentry representing the new file * @mode: the mode with which the new file will be opened * @fop: the 'struct file_operations' for the new file * * Use this instead of get_empty_filp() to get a new * 'struct file'. Do so because of the same initialization * pitfalls reasons listed for init_file(). This is a * preferred interface to using init_file(). * * If all the callers of init_file() are eliminated, its * code should be moved into this function. */ struct file *alloc_file(struct path *path, fmode_t mode, const struct file_operations *fop) { struct file *file;
file = get_empty_filp(); if (!file) return NULL;
file->f_path = *path; file->f_mapping = path->dentry->d_inode->i_mapping; file->f_mode = mode; file->f_op = fop;
/* * These mounts don't really matter in practice * for r/o bind mounts. They aren't userspace- * visible. We do this for consistency, and so * that we can do debugging checks at __fput() */ if ((mode & FMODE_WRITE) && !special_file(path->dentry->d_inode->i_mode)) { file_take_write(file); WARN_ON(mnt_clone_write(path->mnt)); } ima_counts_get(file); return file; } EXPORT_SYMBOL(alloc_file);
void fput(struct file *file) { if (atomic_long_dec_and_test(&file->f_count)) __fput(file); }
EXPORT_SYMBOL(fput);
/** * drop_file_write_access - give up ability to write to a file * @file: the file to which we will stop writing * * This is a central place which will give up the ability * to write to @file, along with access to write through * its vfsmount. */ void drop_file_write_access(struct file *file) { struct vfsmount *mnt = file->f_path.mnt; struct dentry *dentry = file->f_path.dentry; struct inode *inode = dentry->d_inode;
put_write_access(inode);
if (special_file(inode->i_mode)) return; if (file_check_writeable(file) != 0) return; mnt_drop_write(mnt); file_release_write(file); } EXPORT_SYMBOL_GPL(drop_file_write_access);
/* __fput is called from task context when aio completion releases the last * last use of a struct file *. Do not use otherwise. */ void __fput(struct file *file) { struct dentry *dentry = file->f_path.dentry; struct vfsmount *mnt = file->f_path.mnt; struct inode *inode = dentry->d_inode;
might_sleep();
fsnotify_close(file); /* * The function eventpoll_release() should be the first called * in the file cleanup chain. */ eventpoll_release(file); locks_remove_flock(file);
if (unlikely(file->f_flags & FASYNC)) { if (file->f_op && file->f_op->fasync) file->f_op->fasync(-1, file, 0); } if (file->f_op && file->f_op->release) file->f_op->release(inode, file); security_file_free(file); ima_file_free(file); if (unlikely(S_ISCHR(inode->i_mode) && inode->i_cdev != NULL)) cdev_put(inode->i_cdev); fops_put(file->f_op); put_pid(file->f_owner.pid); file_sb_list_del(file); if (file->f_mode & FMODE_WRITE) drop_file_write_access(file); file->f_path.dentry = NULL; file->f_path.mnt = NULL; file_free(file); dput(dentry); mntput(mnt); }
struct file *fget(unsigned int fd) { struct file *file; struct files_struct *files = current->files;
rcu_read_lock(); file = fcheck_files(files, fd); if (file) { if (!atomic_long_inc_not_zero(&file->f_count)) { /* File object ref couldn't be taken */ rcu_read_unlock(); return NULL; } } rcu_read_unlock();
return file; }
EXPORT_SYMBOL(fget);
/* * Lightweight file lookup - no refcnt increment if fd table isn't shared. * You can use this only if it is guranteed that the current task already * holds a refcnt to that file. That check has to be done at fget() only * and a flag is returned to be passed to the corresponding fput_light(). * There must not be a cloning between an fget_light/fput_light pair. */ struct file *fget_light(unsigned int fd, int *fput_needed) { struct file *file; struct files_struct *files = current->files;
*fput_needed = 0; if (likely((atomic_read(&files->count) == 1))) { file = fcheck_files(files, fd); } else { rcu_read_lock(); file = fcheck_files(files, fd); if (file) { if (atomic_long_inc_not_zero(&file->f_count)) *fput_needed = 1; else /* Didn't get the reference, someone's freed */ file = NULL; } rcu_read_unlock(); }
return file; }
void put_filp(struct file *file) { if (atomic_long_dec_and_test(&file->f_count)) { security_file_free(file); file_sb_list_del(file); file_free(file); } }
void file_sb_list_add(struct file *file, struct super_block *sb) { spinlock_t *lock; struct list_head *list; #ifdef CONFIG_SMP int cpu; #endif
lock = &get_cpu_var(files_cpulock); #ifdef CONFIG_SMP cpu = smp_processor_id(); list = per_cpu_ptr(sb->s_files, cpu); file->f_sb_list_cpu = cpu; #else list = &sb->s_files; #endif put_cpu_var(files_cpulock); spin_lock(lock); BUG_ON(!list_empty(&file->f_u.fu_list)); list_add(&file->f_u.fu_list, list); spin_unlock(lock); }
void file_sb_list_del(struct file *file) { if (!list_empty(&file->f_u.fu_list)) { spinlock_t *lock;
#ifdef CONFIG_SMP lock = &per_cpu(files_cpulock, file->f_sb_list_cpu); #else lock = &__get_cpu_var(files_cpulock); #endif spin_lock(lock); list_del_init(&file->f_u.fu_list); spin_unlock(lock); } }
static void file_list_lock_all(void) { int i; int nr = 0;
for_each_possible_cpu(i) { spinlock_t *lock;
lock = &per_cpu(files_cpulock, i); spin_lock_nested(lock, nr); nr++; } }
static void file_list_unlock_all(void) { int i;
for_each_possible_cpu(i) { spinlock_t *lock;
lock = &per_cpu(files_cpulock, i); spin_unlock(lock); } }
int fs_may_remount_ro(struct super_block *sb) { int i;
/* Check that no files are currently opened for writing. */ file_list_lock_all(); for_each_possible_cpu(i) { struct file *file; struct list_head *list;
#ifdef CONFIG_SMP list = per_cpu_ptr(sb->s_files, i); #else list = &sb->s_files; #endif list_for_each_entry(file, list, f_u.fu_list) { struct inode *inode;
if (!(&(file->f_path))) { printk(KERN_ERR "file %p fpath == NULL\n", file); continue; }
if (!file->f_path.dentry) { printk(KERN_ERR "file %p dentry == NULL\n", file); continue; }
if (!file->f_path.dentry->d_inode) { printk(KERN_ERR "file %p d_inode == NULL\n", file); continue; }
inode = file->f_path.dentry->d_inode;
/* File with pending delete? */ if (inode->i_nlink == 0) goto too_bad;
/* Writeable file? */ if (S_ISREG(inode->i_mode) && (file->f_mode & FMODE_WRITE)) goto too_bad; } } file_list_unlock_all(); return 1; /* Tis' cool bro. */ too_bad: file_list_unlock_all(); return 0; }
/** * mark_files_ro - mark all files read-only * @sb: superblock in question * * All files are marked read-only. We don't care about pending * delete files so this should be used in 'force' mode only. */ void mark_files_ro(struct super_block *sb) { int i;
retry: file_list_lock_all(); for_each_possible_cpu(i) { struct file *f; struct list_head *list;
#ifdef CONFIG_SMP list = per_cpu_ptr(sb->s_files, i); #else list = &sb->s_files; #endif list_for_each_entry(f, list, f_u.fu_list) { struct vfsmount *mnt; if (!S_ISREG(f->f_path.dentry->d_inode->i_mode)) continue; if (!file_count(f)) continue; if (!(f->f_mode & FMODE_WRITE)) continue; spin_lock(&f->f_lock); f->f_mode &= ~FMODE_WRITE; spin_unlock(&f->f_lock); if (file_check_writeable(f) != 0) continue; file_release_write(f); mnt = mntget(f->f_path.mnt); /* This can sleep, so we can't hold the spinlock. */ file_list_unlock_all(); mnt_drop_write(mnt); mntput(mnt); goto retry; } } file_list_unlock_all(); }
void __init files_init(unsigned long mempages) { int n; int i;
filp_cachep = kmem_cache_create("filp", sizeof(struct file), 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);
/* * One file with associated inode and dcache is very roughly 1K. * Per default don't use more than 10% of our memory for files. */
n = (mempages * (PAGE_SIZE / 1024)) / 10; files_stat.max_files = n; if (files_stat.max_files < NR_FILE) files_stat.max_files = NR_FILE; files_defer_init(); for_each_possible_cpu(i) spin_lock_init(&per_cpu(files_cpulock, i)); percpu_counter_init(&nr_files, 0); }
| |