netdev - Re: [RFC net] net: make page pool stall netdev unregistration to avoid IOMMU crashes

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Message-ID: <20240809205717.0c966bad@kernel.org>
Date: Fri, 9 Aug 2024 20:57:17 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Yonglong Liu <liuyonglong@...wei.com>
Cc: Yunsheng Lin <linyunsheng@...wei.com>, <netdev@...r.kernel.org>,
 <davem@...emloft.net>, <edumazet@...gle.com>, <pabeni@...hat.com>,
 <ilias.apalodimas@...aro.org>, Jesper Dangaard Brouer <hawk@...nel.org>,
 Alexander Duyck <alexander.duyck@...il.com>
Subject: Re: [RFC net] net: make page pool stall netdev unregistration to
 avoid IOMMU crashes

On Fri, 9 Aug 2024 14:06:02 +0800 Yonglong Liu wrote:
> [ 7724.272853] hns3 0000:7d:01.0: page_pool_release_retry(): eno1v0 
> stalled pool shutdown: id 553, 82 inflight 6706 sec (hold netdev: 1855491)

Alright :( You gotta look around for those 82 pages somehow with drgn.
bpftrace+kfunc the work that does the periodic print to get the address
of the page pool struct and then look around for pages from that pp.. :(