Re: [syzbot] possible deadlock in del_gendisk

[Steven Rostedt]

On Tue, 13 Apr 2021 14:40:09 -0400
Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:

> ------------[ cut here ]------------
> raw_local_irq_restore() called with IRQs enabled
> WARNING: CPU: 0 PID: 8777 at kernel/locking/irqflag-debug.c:9 warn_bogus_irq_restore kernel/locking/irqflag-debug.c:9 [inline]
> WARNING: CPU: 0 PID: 8777 at kernel/locking/irqflag-debug.c:9 warn_bogus_irq_restore+0x1d/0x20 kernel/locking/irqflag-debug.c:7

In fact, when you have the above, which is a WARN() with text:

 "raw_local_irq_restore() called with IRQs enabled"

It is pretty much guaranteed that all triggers of this bug will have the
above warning with the same text.

-- Steve