On Thu, 2020-12-03 at 13:51 +0100, Mike Galbraith wrote:
>
> BUG()
> 0xffffffff812f6e90 is in zs_map_object (mm/zsmalloc.c:1401).
> 1396
> 1397 get_zspage_mapping(zspage, &class_idx, &fg);
> 1398 class = pool->size_class[class_idx];
> 1399 off = (class->size * obj_idx) & ~PAGE_MASK;
> 1400
> 1401 local_lock(&zs_map_area.lock);
> 1402 area = this_cpu_ptr(&zs_map_area);
> 1403 area->vm_mm = mm;
> 1404 if (off + class->size <= PAGE_SIZE) {
> 1405 /* this object is contained entirely within a page */
crash> rt_mutex ffff8a33ded29d20
struct rt_mutex {
wait_lock = {
raw_lock = {
{
val = {
counter = 1
},
{
locked = 1 '\001',
pending = 0 '\000'
},
{
locked_pending = 1,
tail = 0
}
}
},
magic = 3735899821,
owner_cpu = 4,
owner = 0xffff8a337a651b40,
dep_map = {
key = 0x0,
class_cache = {0x0, 0x0},
name = 0xffffffffba10c8da "(lock).lock.lock.wait_lock",
wait_type_outer = 0,
wait_type_inner = 2
}
},
waiters = {
rb_root = {
rb_node = 0xffffa2524328b5e0
},
rb_leftmost = 0xffffa2524328b5e0
},
owner = 0xffff8a3359ff3681,
save_state = 1,
dep_map = {
key = 0x0,
class_cache = {0x0, 0x0},
name = 0x0,
wait_type_outer = 0,
wait_type_inner = 0
}
}
crash>
Oh dear, lock.owner is indeed the guy who made BUG() happen.
