netdev - Re: x86_64: 5.6.0: locking/lockdep.c:1155 lockdep_register

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Message-ID: <CAM_iQpXQdgwFwUONX+za5vJbcXP9krwz_--pG+z_Etf_v8K2mw@mail.gmail.com>
Date:   Fri, 10 Apr 2020 13:50:44 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     open list <linux-kernel@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>, Borislav Petkov <bp@...e.de>,
        Netdev <netdev@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Brian Gerst <brgerst@...il.com>, lkft-triage@...ts.linaro.org,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andriin@...com>
Subject: Re: x86_64: 5.6.0: locking/lockdep.c:1155 lockdep_register_key

On Tue, Apr 7, 2020 at 2:58 AM Naresh Kamboju <naresh.kamboju@...aro.org> wrote:
>
> On Linux mainline kernel 5.6.0 running kselftest on i386 kernel running on
> x86_64 devices we have noticed this kernel warning.
>
> [ 0.000000] Linux version 5.6.0 (oe-user@...host) (gcc version 7.3.0
> (GCC)) #1 SMP Mon Apr 6 17:31:22 UTC 2020
> <>
> [  143.321511] ------------[ cut here ]------------
> [  143.326180] WARNING: CPU: 1 PID: 1515 at
> /usr/src/kernel/kernel/locking/lockdep.c:1155
> lockdep_register_key+0x150/0x180
> [  143.336958] Modules linked in: sch_ingress veth algif_hash
> x86_pkg_temp_thermal fuse
> [  143.344698] CPU: 1 PID: 1515 Comm: ip Tainted: G        W         5.6.0 #1
> [  143.351562] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
> 2.0b 07/27/2017
> [  143.359034] EIP: lockdep_register_key+0x150/0x180
> [  143.363739] Code: ff ff a1 88 4c 2a dc 85 c0 0f 85 ef fe ff ff 68
> 27 02 f9 db 68 a5 7a f7 db e8 0c 5b fa ff 0f 0b 59 58 e9 d7 fe ff ff
> 8d 76 00 <0f> 0b 8d 65 f8 5b 5e 5d c3 8d b4 26 00 00 00 00 89 c2 b8 68
> 68 99
> [  143.382485] EAX: 00000001 EBX: dc329ea8 ECX: 00000001 EDX: dc3299a8
> [  143.388751] ESI: 00000001 EDI: c7316000 EBP: c610fe10 ESP: c610fe08
> [  143.395014] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00010202
> [  143.401792] CR0: 80050033 CR2: b7dd70c0 CR3: 20672000 CR4: 003406d0
> [  143.408051] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
> [  143.414315] DR6: fffe0ff0 DR7: 00000400
> [  143.418144] Call Trace:
> [  143.420592]  alloc_netdev_mqs+0xc6/0x3c0

This is odd, the warning complains a lockdep key is static, but
all of the 3 lockdep keys in netdev_register_lockdep_key() are
dynamic. I don't see how this warning could happen.

Thanks.