netdev - Re: [Intel-wired-lan] [PATCH net] igc: Fix LED-related deadlock on driver unbind

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Message-ID: <ebb704a3-eb09-4433-8858-990e17a87721@linux.intel.com>
Date: Thu, 18 Apr 2024 12:13:17 +0300
From: "naamax.meir" <naamax.meir@...ux.intel.com>
To: Lukas Wunner <lukas@...ner.de>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>,
 Jesse Brandeburg <jesse.brandeburg@...el.com>,
 Tony Nguyen <anthony.l.nguyen@...el.com>
Cc: Andrew Lunn <andrew@...n.ch>, Sasha Neftin <sasha.neftin@...el.com>,
 netdev@...r.kernel.org, Kurt Kanzenbach <kurt@...utronix.de>,
 intel-wired-lan@...ts.osuosl.org, Roman Lozko <lozko.roma@...il.com>,
 Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [Intel-wired-lan] [PATCH net] igc: Fix LED-related deadlock on
 driver unbind

On 4/15/2024 16:48, Lukas Wunner wrote:
> Roman reports a deadlock on unplug of a Thunderbolt docking station
> containing an Intel I225 Ethernet adapter.
> 
> The root cause is that led_classdev's for LEDs on the adapter are
> registered such that they're device-managed by the netdev.  That
> results in recursive acquisition of the rtnl_lock() mutex on unplug:
> 
> When the driver calls unregister_netdev(), it acquires rtnl_lock(),
> then frees the device-managed resources.  Upon unregistering the LEDs,
> netdev_trig_deactivate() invokes unregister_netdevice_notifier(),
> which tries to acquire rtnl_lock() again.
> 
> Avoid by using non-device-managed LED registration.
> 
> Stack trace for posterity:
> 
>    schedule+0x6e/0xf0
>    schedule_preempt_disabled+0x15/0x20
>    __mutex_lock+0x2a0/0x750
>    unregister_netdevice_notifier+0x40/0x150
>    netdev_trig_deactivate+0x1f/0x60 [ledtrig_netdev]
>    led_trigger_set+0x102/0x330
>    led_classdev_unregister+0x4b/0x110
>    release_nodes+0x3d/0xb0
>    devres_release_all+0x8b/0xc0
>    device_del+0x34f/0x3c0
>    unregister_netdevice_many_notify+0x80b/0xaf0
>    unregister_netdev+0x7c/0xd0
>    igc_remove+0xd8/0x1e0 [igc]
>    pci_device_remove+0x3f/0xb0
> 
> Fixes: ea578703b03d ("igc: Add support for LEDs on i225/i226")
> Reported-by: Roman Lozko <lozko.roma@...il.com>
> Closes: https://lore.kernel.org/r/CAEhC_B=ksywxCG_+aQqXUrGEgKq+4mqnSV8EBHOKbC3-Obj9+Q@mail.gmail.com/
> Signed-off-by: Kurt Kanzenbach <kurt@...utronix.de>
> Signed-off-by: Lukas Wunner <lukas@...ner.de>
> Cc: Heiner Kallweit <hkallweit1@...il.com>
> ---
>   drivers/net/ethernet/intel/igc/igc.h      |  2 ++
>   drivers/net/ethernet/intel/igc/igc_leds.c | 38 ++++++++++++++++++++++++-------
>   drivers/net/ethernet/intel/igc/igc_main.c |  3 +++
>   3 files changed, 35 insertions(+), 8 deletions(-)

Tested-by: Naama Meir <naamax.meir@...ux.intel.com>