netdev - Re: [PATCH net v2] net: usbnet: Avoid potential RCU stall on LINK

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Message-ID: <0752dee6-43d6-4e1f-81d2-4248142cccd2@gnuweeb.org>
Date: Sat, 2 Aug 2025 01:09:56 +0700
From: Ammar Faizi <ammarfaizi2@...weeb.org>
To: patchwork-bot+netdevbpf@...nel.org, John Ernberg <john.ernberg@...ia.se>
Cc: Armando Budianto <sprite@...weeb.org>, Oliver Neukum <oneukum@...e.com>,
 Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Linux Netdev Mailing List <netdev@...r.kernel.org>,
 Linux USB Mailing List <linux-usb@...r.kernel.org>,
 Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
 stable@...r.kernel.org, GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>
Subject: Re: [PATCH net v2] net: usbnet: Avoid potential RCU stall on
 LINK_CHANGE event

On 7/26/25 1:10 AM, patchwork-bot+netdevbpf@...nel.org wrote:
> Here is the summary with links:
>    - [net,v2] net: usbnet: Avoid potential RCU stall on LINK_CHANGE event
>      https://git.kernel.org/netdev/net/c/0d9cfc9b8cb1

I just got bitten by this commit after syncing with Linus' tree.

It breaks my laptop. RJ45 LAN cable cannot connect. After git bisect,
it ends up with that commit.

ammarfaizi2@...egral2:~/p/linux-block$ git bisect log
git bisect start
# bad: [ff82265b006e468df734a2d71f9110b73bd740f2] Merge branch 'master' into af/home (sync with mainline)
git bisect bad ff82265b006e468df734a2d71f9110b73bd740f2
# good: [b0896d43221f7858491d59383f56dfe38e7fff34] Merge tag 'kvm-x86-vmx-6.17' of https://github.com/kvm-x86/linux into af/home
git bisect good b0896d43221f7858491d59383f56dfe38e7fff34
# good: [5f5c9952b33cb4e8d25c70ef29f7a45cd26b6a9b] Merge tag 'powerpc-6.17-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
git bisect good 5f5c9952b33cb4e8d25c70ef29f7a45cd26b6a9b
# bad: [8be4d31cb8aaeea27bde4b7ddb26e28a89062ebf] Merge tag 'net-next-6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
git bisect bad 8be4d31cb8aaeea27bde4b7ddb26e28a89062ebf
# good: [c2b93d6beca8526fb38ccc834def1c987afe24fc] eth: fbnic: Create ring buffer for firmware logs
git bisect good c2b93d6beca8526fb38ccc834def1c987afe24fc
# good: [077f7153fd2582874b0dec8c8fcd687677d0f4cc] gve: merge xdp and xsk registration
git bisect good 077f7153fd2582874b0dec8c8fcd687677d0f4cc
# good: [126d85fb040559ba6654f51c0b587d280b041abb] Merge tag 'wireless-next-2025-07-24' of https://git.kernel.org/pub/scm/linux/kernel/git/wireless/wireless-next
git bisect good 126d85fb040559ba6654f51c0b587d280b041abb
# good: [ecc383e5fe060f1aaad0e4e4ae36ad1c899e948d] Merge tag 'linux-can-next-for-6.17-20250725' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next
git bisect good ecc383e5fe060f1aaad0e4e4ae36ad1c899e948d
# bad: [c58c18be8850d58fd61b0480d2355df89ce7ee59] Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
git bisect bad c58c18be8850d58fd61b0480d2355df89ce7ee59
# good: [620e2392db235ba3b9e9619912aadb8cadee15e7] net: dsa: microchip: Disable PTP function of KSZ8463
git bisect good 620e2392db235ba3b9e9619912aadb8cadee15e7
# bad: [2764ab51d5f0e8c7d3b7043af426b1883e3bde1d] stmmac: xsk: fix negative overflow of budget in zerocopy mode
git bisect bad 2764ab51d5f0e8c7d3b7043af426b1883e3bde1d
# good: [4fc7885c3a98ec4450103aef874fb1d35920c7af] Merge branch 'mlx5e-misc-fixes-2025-07-23'
git bisect good 4fc7885c3a98ec4450103aef874fb1d35920c7af
# bad: [1bbb76a899486827394530916f01214d049931b3] neighbour: Fix null-ptr-deref in neigh_flush_dev().
git bisect bad 1bbb76a899486827394530916f01214d049931b3
# bad: [165a7f5db919ab68a45ae755cceb751e067273ef] net: dsa: microchip: Fix wrong rx drop MIB counter for KSZ8863
git bisect bad 165a7f5db919ab68a45ae755cceb751e067273ef
# bad: [0d9cfc9b8cb17dbc29a98792d36ec39a1cf1395f] net: usbnet: Avoid potential RCU stall on LINK_CHANGE event
git bisect bad 0d9cfc9b8cb17dbc29a98792d36ec39a1cf1395f
# first bad commit: [0d9cfc9b8cb17dbc29a98792d36ec39a1cf1395f] net: usbnet: Avoid potential RCU stall on LINK_CHANGE event

-- 
Ammar Faizi