On Sat, Feb 02, 2019 at 03:07:35PM -0500, Kimberly Brown wrote:
On Fri, Feb 01, 2019 at 06:24:24PM +0000, Dexuan Cui wrote:
> From: Kimberly Brown <kimbrownkd@xxxxxxxxx>
> Sent: Thursday, January 31, 2019 9:47 AM
> ...
> 2) Prevent a deadlock that can occur between the proposed mutex_lock()
> call in the vmbus_chan_attr_show() function and the sysfs/kernfs functions.
Hi Kim,
Can you please share more details about the deadlock?
It's unclear to me how the deadlock happens.
Hi Dexuan,
I encountered the deadlock by:
1) Adding a call to msleep() before acquiring the mutex in
vmbus_chan_attr_show()
2) Opening a hv_netvsc subchannel's sysfs file
3) Removing hv_netvsc while the sysfs file is opening
Dexuan, any objections to pulling this fix in?
--
Thanks,
Sasha
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