From: Tejun Heo
cfq_get_queue()'s control flow looks like the following.
async_cfqq = NULL;
cfqq = NULL;
if (!is_sync) {
...
async_cfqq = ...;
cfqq = *async_cfqq;
}
if (!cfqq)
cfqq = ...;
From: Tejun Heo
Async cfqq's (cfq_queue's) are shared across cfq_data. When
cfq_get_queue() obtains a new queue from cfq_find_alloc_queue(), it
stashes the pointer in cfq_data and reuses it from then on; however,
the function doesn't consider that cfq_find_alloc_queue() may return
the oom_cfqq u
From: Tejun Heo
If the cfq_queue cached in cfq_io_cq is the oom one, cfq_set_request()
replaces it by invoking cfq_get_queue() again without putting the oom
queue leaking the reference it was holding. While oom queues are not
released through reference counting, they're still reference counted
a
ML: 3c53e514212455db9923c203694a72007558b48f
From: Jan Kara
A check in inotify_fdinfo() checking whether mark is valid was always
true due to a bug. Luckily we can never get to invalidated marks since
we hold mark_mutex and invalidated marks get removed from the group list
when they are invalid
So, the ptrace() hangs if we try to attach to stopped task
from freezing cgroup:
Tracee: Tracer:
static bool do_signal_stop(int signr)
__set_current_state(TASK_STOPPED);
freezable_schedule();
freezer_do_not_count();
On 30/10/15 18:54, Pádraig Brady wrote:
> On 30/10/15 16:57, Pádraig Brady wrote:
>> On 30/10/15 09:02, Dmitry Monakhov wrote:
>>> fallocate can allocate extens beyond EOF via FALLOC_FL_KEEP_SIZE.
>>> Currenly sparse engine tries to copy such extents which is wrong and
>>> result in silent data cor
