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

NTB: epf: Avoid calling pci_irq_vector() from hardirq context

ntb_epf_vec_isr() calls pci_irq_vector() in hardirq context to derive
the vector number. pci_irq_vector() calls msi_get_virq() that takes a
mutex and can therefore trigger "scheduling while atomic" splats:

  BUG: scheduling while atomic: kworker/u33:0/55/0x00010001
  ...
  Call trace:
   ...
   schedule+0x38/0x110
   schedule_preempt_disabled+0x28/0x50
   __mutex_lock.constprop.0+0x848/0x908
   __mutex_lock_slowpath+0x18/0x30
   mutex_lock+0x4c/0x60
   msi_domain_get_virq+0xe8/0x138
   pci_irq_vector+0x2c/0x60
   ntb_epf_vec_isr+0x28/0x120 [ntb_hw_epf]
   __handle_irq_event_percpu+0x70/0x3a8
   handle_irq_event+0x48/0x100
   handle_edge_irq+0x100/0x1c8
   ...

Cache the Linux IRQ number for vector 0 when vectors are allocated and
use it as a base in the ISR. Running the ISR in a threaded IRQ handler
would also avoid the problem, but that would be unnecessary here.

https://git.kernel.org/stable/c/174a97f21bf9c54fa37ec0f321692e862ea130a3

https://git.kernel.org/stable/c/1dba8444ac0100133d72374634f6d7451fff1ccc

https://git.kernel.org/stable/c/33bba331a4a5fee8b6026fe72eca13cceeec1b7b

https://git.kernel.org/stable/c/4dcddc1c794d1c65eda68f1f8dd04a0fecc0870f

https://git.kernel.org/stable/c/6350df503897d57c5634f71b0767d48c3b837583

https://git.kernel.org/stable/c/aff271b12a1eb8c8b3da19223ae1a6abe1e8168b

https://git.kernel.org/stable/c/f71e8d9875069fa73e335f63f02ec6e52e3aaa51

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