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Re: [PATCH 2/2] xen/xenbus: check otherend_id only after it has been initialized
- To: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Mon, 3 Aug 2026 16:16:51 +0200
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>, Jakub Kicinski <kuba@xxxxxxxxxx>, Bjorn Helgaas <bhelgaas@xxxxxxxxxx>, Jason Andryuk <jason.andryuk@xxxxxxx>, "moderated list:XEN HYPERVISOR INTERFACE" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 03 Aug 2026 14:16:55 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 03.08.26 05:08, Marek Marczykowski-Górecki wrote:
When device just got initialized (for example on module load), the
otherend_id field is initialized only after
xenbus_read_otherend_details() gets called. If xenstore watch triggers
xenbus_dev_changed() before that, it might consider still zeroed
otherend_id field (not matching actual xenstore content) as a sign of
device state reset. It can happen because xenstore watch are handled in
another thread (xenwatch), which can run in parallel to the initial
device probe running at module load. In that case, it would call
device_unregister(), which would deadlock against device probe from
module init.
Fix this by considering dev->otherend_id change only after dev->otherend
is set (which happen after otherend_id is initialized).
Fixes: e2dcf9065536 "xen/xenbus: better handle backend crash"
Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Juergen
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