Re: BUG: unable to handle kernel paging request in scsi_device_unbusy

[Bart Van Assche]

On 9/15/22 08:56, Rondreis wrote:
> CPU: 0 PID: 12256 Comm: usb-storage Not tainted 6.0.0-rc4+ #20
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS

Does the above indicate an x86 CPU?

> Call Trace:
>   <TASK>
>   instrument_atomic_write include/linux/instrumented.h:86 [inline]
>   set_bit include/asm-generic/bitops/instrumented-atomic.h:28 [inline]
>   sbitmap_deferred_clear_bit include/linux/sbitmap.h:327 [inline]
>   sbitmap_put include/linux/sbitmap.h:336 [inline]
>   scsi_device_unbusy+0x1aa/0x380 drivers/scsi/scsi_lib.c:301

There is some tricky code in the sbitmap implementation. How about 
checking the implementation of that code to see whether any memory 
barriers are missing?

Thanks,

Bart.