linux-kernel - Re: WARNING: CPU: 1 PID: 1 at net/core/netpoll.c:370 netpoll_send_skb+0x1fc/0x20c at boot when netconsole is enabled (kernel v6.9-rc5, v6.8.7, sungem, PowerMac G4 DP)

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Date: Sat, 4 May 2024 16:59:40 +0200
From: Erhard Furtner <erhard_f@...lbox.org>
To: Jakub Kicinski <kuba@...nel.org>
Cc: netdev@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
 linux-kernel@...r.kernel.org
Subject: Re: WARNING: CPU: 1 PID: 1 at net/core/netpoll.c:370
 netpoll_send_skb+0x1fc/0x20c at boot when netconsole is enabled (kernel
 v6.9-rc5, v6.8.7, sungem, PowerMac G4 DP)

On Mon, 29 Apr 2024 18:36:30 -0700
Jakub Kicinski <kuba@...nel.org> wrote:

> On Sun, 28 Apr 2024 12:53:06 +0200 Erhard Furtner wrote:
> > With netconsole enabled I get this "WARNING: CPU: 1 PID: 1 at
> > net/core/netpoll.c:370 netpoll_send_skb+0x1fc/0x20c" and "WARNING:
> > CPU: 1 PID: 1 at kernel/locking/irqflag-debug.c:10
> > warn_bogus_irq_restore+0x30/0x44" at boot on my PowerMac G4 DP.
> > Happens more often than not (6-7 out of 10 times booting):  
> 
> Could you try with LOCKDEP enabled?
> I wonder if irqs_disabled() behaves differently than we expect.

Enabled LOCK_ALLOC and LOCKDEP and re-tried with v6.9-rc6. I can reproduce the WARNING but got no additional dmesg.

I'll check whether PROVE_LOCKING makes a difference or any of the locking tests show something interesting.

Full dmesg attached.

Regards,
Erhard

Download attachment "dmesg_69-rc6_g4_00" of type "application/octet-stream" (48021 bytes)