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Subjectoops in 2.4.4-ac9 (mm/slab.c)
Hello people,

I triggered an "invalid operand" oops in linux-2.4.4-ac9 today, and could
trace it back to the line mm/slab.c:1244. I did nothing really special
when this happened, and I was not able to log in onto any console or
terminal afterwards (probably because tty_open failed very miserably
on the way?)

The final BUG() is found inside:

static inline void * kmem_cache_alloc_one_tail (kmem_cache_t *cachep,
slab_t *slabp)
{
[...]

#if DEBUG
if (cachep->flags & SLAB_POISON)
if (kmem_check_poison_obj(cachep, objp))
BUG();
^^^^^^ This one is triggered
if (cachep->flags & SLAB_RED_ZONE) {
/* Set alloc red-zone, and check old one. */
[...]
#endif
[...]
}

So CONFIG_DEBUG_SLAB (which I have enabled, out of curiosity and to help you all)
might have found a bug here.

ksymoops output is found below.

Greetings and happy hacking,
Andreas

---snip---

ksymoops 2.4.0 on i686 2.4.4-ac9. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.4-ac9/ (default)
-m /boot/System.map-2.4.4-ac9 (default)

Warning: You did not tell me where to find symbol information. I will
assume that the log matches the kernel and modules that are running
right now and I'll use the default options above for symbol resolution.
If the current kernel and/or modules do not match the log, you can get
more accurate output by telling me the kernel version and where to find
map, modules, ksyms etc. ksymoops -h explains the options.

Warning (compare_maps): ksyms_base symbol __VERSIONED_SYMBOL(bm_cast_buffer) not found in System.map. Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol __VERSIONED_SYMBOL(bm_copy_to_buffer) not found in System.map. Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol __VERSIONED_SYMBOL(bm_evaluate_object) not found in System.map. Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol __VERSIONED_SYMBOL(bm_evaluate_reference_list) not found in System.map. Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol __VERSIONED_SYMBOL(bm_evaluate_simple_integer) not found in System.map. Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol __VERSIONED_SYMBOL(bm_extract_package_data) not found in System.map. Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol __VERSIONED_SYMBOL(bm_get_device_context) not found in System.map. Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol __VERSIONED_SYMBOL(bm_get_device_info) not found in System.map. Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol __VERSIONED_SYMBOL(bm_get_device_power_state) not found in System.map. Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol __VERSIONED_SYMBOL(bm_get_device_status) not found in System.map. Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol __VERSIONED_SYMBOL(bm_get_node) not found in System.map. Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol __VERSIONED_SYMBOL(bm_osl_generate_event) not found in System.map. Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol __VERSIONED_SYMBOL(bm_proc_root) not found in System.map. Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol __VERSIONED_SYMBOL(bm_register_driver) not found in System.map. Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol __VERSIONED_SYMBOL(bm_request) not found in System.map. Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol __VERSIONED_SYMBOL(bm_search) not found in System.map. Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol __VERSIONED_SYMBOL(bm_set_device_power_state) not found in System.map. Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol __VERSIONED_SYMBOL(bm_unregister_driver) not found in System.map. Ignoring ksyms_base entry
Warning (compare_maps): ksyms_base symbol acpi_fadt_R__ver_acpi_fadt not found in System.map. Ignoring ksyms_base entry
Warning (compare_maps): mismatch on symbol partition_name , ksyms_base says c01f2b40, System.map says c01485d0. Ignoring ksyms_base entry
invalid operand: 0000
CPU: 0
EIP: 0010:[<c012621e>]
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010012
eax: dea55fff ebx: c40fc768 ecx: 00000001 edx: 00000001
esi: dea55000 edi: dea559aa ebp: 00012800 esp: cc0d1e68
ds: 0018 es: 0018 ss: 0018
Process blogd (pid: 4143, stackpage=cc0d1000)
Stack: 00000000 00008000 c03219c0 c03219c0 00001000 dea559aa 00000246 c017ad0d
00000c3c 00000007 c03219c0 c017b92c 00000000 c03219c0 c03219c0 00000000
cc0d0000 00000000 00000000 00000000 df8ee658 00000000 cc0d0000 00000000
Call Trace: [<c017ad0d>] [<c017b92c>] [<c017c34b>] [<c012e70f>] [<c0137717>]
[<c012e892>] [<c012da95>] [<c012d9ce>] [<c012dcb6>] [<c0106b5f>]
Code: 0f 0b f7 c5 00 04 00 00 74 2a b8 a5 c2 0f 17 87 06 3d 71 f0

>>EIP; c012621e <kmalloc+10a/184> <=====
Trace; c017ad0d <alloc_tty_struct+d/28>
Trace; c017b92c <init_dev+8c/420>
Trace; c017c34b <tty_open+f7/360>
Trace; c012e70f <get_chrfops+67/c8>
Trace; c0137717 <permission+2b/30>
Trace; c012e892 <chrdev_open+3e/4c>
Trace; c012da95 <dentry_open+bd/140>
Trace; c012d9ce <filp_open+52/5c>
Trace; c012dcb6 <sys_open+36/98>
Trace; c0106b5f <system_call+33/38>
Code; c012621e <kmalloc+10a/184>
00000000 <_EIP>:
Code; c012621e <kmalloc+10a/184> <=====
0: 0f 0b ud2a <=====
Code; c0126220 <kmalloc+10c/184>
2: f7 c5 00 04 00 00 test $0x400,%ebp
Code; c0126226 <kmalloc+112/184>
8: 74 2a je 34 <_EIP+0x34> c0126252 <kmalloc+13e/184>
Code; c0126228 <kmalloc+114/184>
a: b8 a5 c2 0f 17 mov $0x170fc2a5,%eax
Code; c012622d <kmalloc+119/184>
f: 87 06 xchg %eax,(%esi)
Code; c012622f <kmalloc+11b/184>
11: 3d 71 f0 00 00 cmp $0xf071,%eax


21 warnings issued. Results may not be reliable.

---snip---


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