netdev - Re: [PATCH next] loopback: fix lockdep splat

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Date:   Wed, 03 Jul 2019 11:24:59 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     maheshb@...gle.com
Cc:     netdev@...r.kernel.org, edumazet@...gle.com, mahesh@...dewar.net,
        geert@...ux-m68k.org
Subject: Re: [PATCH next] loopback: fix lockdep splat

From: Mahesh Bandewar <maheshb@...gle.com>
Date: Tue,  2 Jul 2019 23:16:31 -0700

> dev_init_scheduler() and dev_activate() expect the caller to
> hold RTNL. Since we don't want blackhole device to be initialized
> per ns, we are initializing at init.
> 
> [    3.855027] Call Trace:
> [    3.855034]  dump_stack+0x67/0x95
> [    3.855037]  lockdep_rcu_suspicious+0xd5/0x110
> [    3.855044]  dev_init_scheduler+0xe3/0x120
> [    3.855048]  ? net_olddevs_init+0x60/0x60
> [    3.855050]  blackhole_netdev_init+0x45/0x6e
> [    3.855052]  do_one_initcall+0x6c/0x2fa
> [    3.855058]  ? rcu_read_lock_sched_held+0x8c/0xa0
> [    3.855066]  kernel_init_freeable+0x1e5/0x288
> [    3.855071]  ? rest_init+0x260/0x260
> [    3.855074]  kernel_init+0xf/0x180
> [    3.855076]  ? rest_init+0x260/0x260
> [    3.855078]  ret_from_fork+0x24/0x30
> 
> Fixes: 4de83b88c66 ("loopback: create blackhole net device similar to loopack.")
> Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Mahesh Bandewar <maheshb@...gle.com>

Applied.