In the Linux kernel, the following vulnerability has been resolved:

aoe: avoid potential deadlock at set_capacity

Move set_capacity() outside of the section procected by (&d->lock).
To avoid possible interrupt unsafe locking scenario:

        CPU0                    CPU1
        ----                    ----
[1] lock(&bdev->bd_size_lock);
                                local_irq_disable();
                            [2] lock(&d->lock);
                            [3] lock(&bdev->bd_size_lock);
   <Interrupt>
[4]  lock(&d->lock);

  *** DEADLOCK ***

Where [1](&bdev->bd_size_lock) hold by zram_add()->set_capacity().
[2]lock(&d->lock) hold by aoeblk_gdalloc(). And aoeblk_gdalloc()
is trying to acquire [3](&bdev->bd_size_lock) at set_capacity() call.
In this situation an attempt to acquire [4]lock(&d->lock) from
aoecmd_cfg_rsp() will lead to deadlock.

So the simplest solution is breaking lock dependency
[2](&d->lock) -> [3](&bdev->bd_size_lock) by moving set_capacity()
outside.

kernel.org https://git.kernel.org/stable/c/19a77b27163820f793b4d022979ffdca8f659b77 [No types assigned]

kernel.org https://git.kernel.org/stable/c/2d623c94fbba3554f4446ba6f3c764994e8b0d26 [No types assigned]

kernel.org https://git.kernel.org/stable/c/673629018ba04906899dcb631beec34d871f709c [No types assigned]

kernel.org https://git.kernel.org/stable/c/e169bd4fb2b36c4b2bee63c35c740c85daeb2e86 [No types assigned]