On 19.01.22 16:15, David Hildenbrand wrote:
> On 19.01.22 16:08, Boqun Feng wrote:
>> Hi,
>>
>> On Wed, Jan 19, 2022 at 12:37:02PM +0100, David Hildenbrand wrote:
>>> Lockdep complains that we do during mmap of the vmcore:
>>> down_write(mmap_lock);
>>> down_read(vmcore_cb_rwsem);
>>> And
On 19.01.22 16:08, Boqun Feng wrote:
> Hi,
>
> On Wed, Jan 19, 2022 at 12:37:02PM +0100, David Hildenbrand wrote:
>> Lockdep complains that we do during mmap of the vmcore:
>> down_write(mmap_lock);
>> down_read(vmcore_cb_rwsem);
>> And during read of the vmcore:
>>
Hi,
On Wed, Jan 19, 2022 at 12:37:02PM +0100, David Hildenbrand wrote:
> Lockdep complains that we do during mmap of the vmcore:
> down_write(mmap_lock);
> down_read(vmcore_cb_rwsem);
> And during read of the vmcore:
> down_read(vmcore_cb_rwsem);
> down_read(mmap_lock);
>
Lockdep complains that we do during mmap of the vmcore:
down_write(mmap_lock);
down_read(vmcore_cb_rwsem);
And during read of the vmcore:
down_read(vmcore_cb_rwsem);
down_read(mmap_lock);
We cannot possibly deadlock when only taking vmcore_cb_rwsem in read
mode,
