kernel BUG at slab.c:1292

Hi all,

I asked on #kernelnewbies what I should do with this and was told to check the mailing list archive at http://marc.theaimsgroup.com/ - which I've done.

The following was produced during boot. I _looks_ like it was during a modprobe, but I'm not entirely sure what - it could be that binfmt_misc but I couldn't find any docs in the tree for BUG() tracebacks (and I probably wouldn't have understood the source).

I'm not subscribed to the list: if anyone wants more info, drop me private mail and I'll see what I can do.

Hope this helps,

Thanks,

-- Peter

Oct  2 16:59:40 advent kernel: ------------[ cut here ]------------
Oct  2 16:59:40 advent kernel: kernel BUG at slab.c:1292!
Oct  2 16:59:40 advent kernel: invalid operand: 0000
Oct  2 16:59:40 advent kernel: vfat fat binfmt_misc
Oct  2 16:59:40 advent kernel: CPU:    0
Oct  2 16:59:40 advent kernel: EIP:    0060:[kmem_cache_alloc+346/464]    Not 
tainted
Oct  2 16:59:40 advent kernel: EFLAGS: 00010012
Oct  2 16:59:40 advent kernel: EIP is at kmem_cache_alloc+0x15a/0x1d0
Oct  2 16:59:40 advent kernel: eax: ca342fff   ebx: ca342000   ecx: 00000001   
edx: 00000001
Oct  2 16:59:40 advent kernel: esi: c11af390   edi: 00000000   ebp: 00012800   
esp: ca139f18
Oct  2 16:59:40 advent kernel: ds: 0068   es: 0068   ss: 0068
Oct  2 16:59:40 advent kernel: Process mount (pid: 72, threadinfo=ca138000 
task=ca695900)
Oct  2 16:59:40 advent kernel: Stack: c024dc00 fffffff4 ca7ff39c ca139f5c 
00001000 00000000 00000246 c013dfcc
Oct  2 16:59:40 advent kernel:        c11af390 000001d0 ca138000 ffffffff 
ca7ff39c c0105a6e c024dc00 ca138000
Oct  2 16:59:40 advent kernel:        ffffffff ca695900 c0106dc3 c024dc00 
ca139fd8 c024dd00 ffffffff ca7ff39c
Oct  2 16:59:40 advent kernel: Call Trace:
Oct  2 16:59:40 advent kernel:  [getname+28/156]getname+0x1c/0x9c
Oct  2 16:59:40 advent kernel:  [sys_execve+14/96]sys_execve+0xe/0x60
Oct  2 16:59:40 advent kernel:  [syscall_call+7/11]syscall_call+0x7/0xb
Oct  2 16:59:40 advent kernel:  
[exec_usermodehelper+859/904]exec_usermodehelper+0x35b/0x388
Oct  2 16:59:40 advent kernel:  [exec_modprobe+0/164]exec_modprobe+0x0/0xa4
Oct  2 16:59:40 advent kernel:  [exec_modprobe+92/164]exec_modprobe+0x5c/0xa4
Oct  2 16:59:40 advent kernel:  [exec_modprobe+0/164]exec_modprobe+0x0/0xa4
Oct  2 16:59:40 advent kernel:  
[kernel_thread_helper+5/12]kernel_thread_helper+0x5/0xc
Oct  2 16:59:40 advent kernel:
Oct  2 16:59:40 advent kernel: Code: 0f 0b 0c 05 b3 9a 20 c0 f7 c5 00 04 00 00 

74 36 b8 a5 c2 0f

Try this. I just sent it to Linus.
Petr Vandrovec

diff -urdN linux/fs/fat/inode.c linux/fs/fat/inode.c
@@ -228,8 +228,6 @@
 	save = 0;
 	savep = NULL;
 	while ((this_char = strsep(&options,",")) != NULL) {
-		if (!*this_char)
-			continue;
 		if ((value = strchr(this_char,'=')) != NULL) {
 			save = *value;
 			savep = value;

@@ -351,7 +349,7 @@
 			strncpy(cvf_options,value,100);
 		}
 
-		if (this_char != options) *(this_char-1) = ',';
+		if (options) *(options-1) = ',';
 		if (value) *savep = save;
 		if (ret == 0)
 			break;

diff -urdN linux/fs/vfat/namei.c linux/fs/vfat/namei.c
@@ -117,8 +117,6 @@
 	savep = NULL;
 	ret = 1;
 	while ((this_char = strsep(&options,",")) != NULL) {
-		if (!*this_char)
-			continue;
 		if ((value = strchr(this_char,'=')) != NULL) {
 			save = *value;
 			savep = value;

@@ -154,8 +152,8 @@
 			else
 				ret = 0;
 		}
-		if (this_char != options)
-			*(this_char-1) = ',';
+		if (options)
+			*(options-1) = ',';
 		if (value) {
 			*savep = save;
 		}

Petr,

This appears to have done the trick.

-- Peter