Messages in this thread Patch in this message | | | Date | Mon, 13 Mar 2006 01:55:50 +0300 | From | Alexey Dobriyan <> | Subject | Re: 2.6.16-rc6-mm1: BUG at fs/sysfs/inode.c:180 |
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On Sun, Mar 12, 2006 at 07:45:05PM +0100, Laurent Riffard wrote: > This kernel hangs on boot while trying to activate logical > volumes from initrd: > > ------------[ cut here ]------------ > kernel BUG at fs/sysfs/inode.c:180! > invalid opcode: 0000 [#1] > last sysfs file: /block/ram0/dev > Modules linked in: dm_mirror dm_mod > CPU: 0 > EIP: 0060:[<c0172e71>] Not tainted VLI > EFLAGS: 00010246 (2.6.16-rc6-mm1 #123) > EIP is at sysfs_get_name+0xd/0x46 > eax: c15a49c8 ebx: dfe2b988 ecx: dff254d8 edx: c15a49cc > esi: dfe87b05 edi: dfe2b988 ebp: dfe67d28 esp: dfe67d28 > ds: 007b es: 007b ss: 0068 > Process vgchange (pid: 242, threadinfo=dfe67000 task=dfe175d0) > Stack: <0>dfe67d44 c01738c3 dffdc4b4 c15a49c8 dfe2b988 ffffffef dfe2b98d dfe67d60 > c0173dcd dff2a804 dfe2b984 dfe2b984 00000001 fffffffe dfe67d74 c0173f3b > dfe67d6c c15a84d4 dfe2b984 dfe67d90 c01a33fd c03242d0 00000004 dfe2b8f8 > Call Trace: > [<c0103a31>] show_stack_log_lvl+0x8b/0x95 > [<c0103b69>] show_registers+0x12e/0x194 > [<c0103e62>] die+0x14e/0x1db > [<c01040ba>] do_trap+0x7c/0x96 > [<c0104319>] do_invalid_op+0x89/0x93 > [<c01034db>] error_code+0x4f/0x54 > [<c01738c3>] sysfs_dirent_exist+0x1c/0x65 > [<c0173dcd>] create_dir+0x55/0x17d > [<c0173f3b>] sysfs_create_dir+0x46/0x61 > [<c01a33fd>] kobject_add+0xa4/0x14c > [<c017267e>] register_disk+0x4b/0xe9 > [<c019c28c>] add_disk+0x2e/0x3d > [<e08198a5>] create_aux+0x27e/0x2d7 [dm_mod] > [<e081991d>] dm_create+0xe/0x10 [dm_mod] > [<e081c317>] dev_create+0x4a/0x239 [dm_mod] > [<e081c18c>] ctl_ioctl+0x203/0x238 [dm_mod] > [<c0156648>] do_ioctl+0x3c/0x4f > [<c0156851>] vfs_ioctl+0x1f6/0x20d > [<c0156892>] sys_ioctl+0x2a/0x44 > [<c01029bb>] sysenter_past_esp+0x54/0x75 > Code: 0b 30 01 72 85 28 c0 ff 06 31 db eb 07 89 f8 e8 d1 8d fe ff 83 c4 10 89 d8 5b 5e 5f c9 c3 55 85 c0 89 e5 74 06 83 78 14 00 75 08 <0f> 0b b4 00 73 d3 28 c0 8b 50 18 83 fa 08 74 22 7f 0a 83 fa 02 > BUG: vgchange/242, lock held at task exit time! > [dff25548] {inode_init_once} > .. held by: vgchange: 242 [dfe175d0, 102] > ... acquired at: create_dir+0x1d/0x17d > > > There was no such problems with 2.6.16-rc5-mm3, I didn't change my > kernel config.
Does reverting this patch make it work?
BTW, sysfs_dirent_exist() should return 0 or 1. ---------------------------------------------------------------- The following patch checks for existing sysfs_dirent before preparing new one while creating sysfs directories and files.
Signed-off-by: Maneesh Soni <maneesh@in.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- fs/sysfs/dir.c | 30 +++++++++++++++++++++++++++++- fs/sysfs/file.c | 6 ++++-- fs/sysfs/symlink.c | 5 +++-- fs/sysfs/sysfs.h | 1 + 4 files changed, 37 insertions(+), 5 deletions(-)
--- gregkh-2.6.orig/fs/sysfs/dir.c +++ gregkh-2.6/fs/sysfs/dir.c @@ -51,6 +51,30 @@ static struct sysfs_dirent * sysfs_new_d return sd; } +/** + * + * Return -EEXIST if there is already a sysfs element with the same name for + * the same parent. + * + * called with parent inode's i_mutex held + */ +int sysfs_dirent_exist(struct sysfs_dirent *parent_sd, + const unsigned char *new) +{ + struct sysfs_dirent * sd; + + list_for_each_entry(sd, &parent_sd->s_children, s_sibling) { + const unsigned char * existing = sysfs_get_name(sd); + if (strcmp(existing, new)) + continue; + else + return -EEXIST; + } + + return 0; +} + + int sysfs_make_dirent(struct sysfs_dirent * parent_sd, struct dentry * dentry, void * element, umode_t mode, int type) { @@ -117,7 +141,11 @@ static int create_dir(struct kobject * k mutex_lock(&p->d_inode->i_mutex); *d = lookup_one_len(n, p, strlen(n)); if (!IS_ERR(*d)) { - error = sysfs_make_dirent(p->d_fsdata, *d, k, mode, SYSFS_DIR); + if (sysfs_dirent_exist(p->d_fsdata, n)) + error = -EEXIST; + else + error = sysfs_make_dirent(p->d_fsdata, *d, k, mode, + SYSFS_DIR); if (!error) { error = sysfs_create(*d, mode, init_dir); if (!error) { --- gregkh-2.6.orig/fs/sysfs/file.c +++ gregkh-2.6/fs/sysfs/file.c @@ -436,10 +436,12 @@ int sysfs_add_file(struct dentry * dir, { struct sysfs_dirent * parent_sd = dir->d_fsdata; umode_t mode = (attr->mode & S_IALLUGO) | S_IFREG; - int error = 0; + int error = -EEXIST; mutex_lock(&dir->d_inode->i_mutex); - error = sysfs_make_dirent(parent_sd, NULL, (void *) attr, mode, type); + if (!sysfs_dirent_exist(parent_sd, attr->name)) + error = sysfs_make_dirent(parent_sd, NULL, (void *)attr, + mode, type); mutex_unlock(&dir->d_inode->i_mutex); return error; --- gregkh-2.6.orig/fs/sysfs/symlink.c +++ gregkh-2.6/fs/sysfs/symlink.c @@ -82,12 +82,13 @@ exit1: int sysfs_create_link(struct kobject * kobj, struct kobject * target, const char * name) { struct dentry * dentry = kobj->dentry; - int error = 0; + int error = -EEXIST; BUG_ON(!kobj || !kobj->dentry || !name); mutex_lock(&dentry->d_inode->i_mutex); - error = sysfs_add_link(dentry, name, target); + if (!sysfs_dirent_exist(dentry->d_fsdata, name)) + error = sysfs_add_link(dentry, name, target); mutex_unlock(&dentry->d_inode->i_mutex); return error; } --- gregkh-2.6.orig/fs/sysfs/sysfs.h +++ gregkh-2.6/fs/sysfs/sysfs.h @@ -5,6 +5,7 @@ extern kmem_cache_t *sysfs_dir_cachep; extern struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent *); extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *)); +extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *); extern int sysfs_make_dirent(struct sysfs_dirent *, struct dentry *, void *, umode_t, int); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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