linux-kernel - [BUG] drivers/tty/hvc: a possible sleep-in-atomic bug in xen_pv_console

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Message-ID: <1e23a5cc-8dad-e7d5-ea2d-3acbc1f34c3e@163.com>
Date:   Tue, 12 Dec 2017 09:35:52 +0800
From:   Jia-Ju Bai <baijiaju1990@....com>
To:     gregkh@...uxfoundation.org, jslaby@...e.com,
        benh@...nel.crashing.org
Cc:     linuxppc-dev@...ts.ozlabs.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [BUG] drivers/tty/hvc: a possible sleep-in-atomic bug in
 xen_pv_console_init

According to drivers/tty/hvc/hvc_xen.c, the kernel module may sleep 
under a spinlock.
The function call path is:
xen_pv_console_init (acquire the spinlock)
   xencons_info_pv_init
     gfn_to_virt (gfn_to_pfn) --> may sleep

I do not find a good way to fix it, so I only report.
This possible bug is found by my static analysis tool (DSAC) and my code 
review.


Thanks,
Jia-Ju Bai