linux-kernel - Re: linux-next: Tree for Nov 5

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Date:   Tue, 10 Nov 2020 08:50:33 +0100
From:   Anders Roxell <anders.roxell@...aro.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>, glider@...gle.com,
        Marco Elver <elver@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>, jannh@...gle.com
Cc:     Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: Tree for Nov 5

On Thu, 5 Nov 2020 at 07:06, Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> Hi all,
>
> Changes since 20201104:

When building an arm64 allmodconfig and booting up that in qemu I see

[10011.092394][   T28] task:kworker/0:2     state:D stack:26896 pid:
1840 ppid:     2 flags:0x00000428
[10022.368093][   T28] Workqueue: events toggle_allocation_gate
[10024.827549][   T28] Call trace:
[10027.152494][   T28]  __switch_to+0x1cc/0x1e0
[10031.378073][   T28]  __schedule+0x730/0x800
[10032.164468][   T28]  schedule+0xd8/0x160
[10033.886807][   T28]  toggle_allocation_gate+0x16c/0x220
[10038.477987][   T28]  process_one_work+0x5c0/0x980
[10039.900075][   T28]  worker_thread+0x428/0x720
[10042.782911][   T28]  kthread+0x23c/0x260
[10043.171725][   T28]  ret_from_fork+0x10/0x18
[10046.227741][   T28] INFO: lockdep is turned off.
[10047.732220][   T28] Kernel panic - not syncing: hung_task: blocked tasks
[10047.741785][   T28] CPU: 0 PID: 28 Comm: khungtaskd Tainted: G
  W         5.10.0-rc2-next-20201105-00006-g7af110e4d8ed #1
[10047.755348][   T28] Hardware name: linux,dummy-virt (DT)
[10047.763476][   T28] Call trace:
[10047.769802][   T28]  dump_backtrace+0x0/0x420
[10047.777104][   T28]  show_stack+0x38/0xa0
[10047.784177][   T28]  dump_stack+0x1d4/0x278
[10047.791362][   T28]  panic+0x304/0x5d8
[10047.798202][   T28]  check_hung_uninterruptible_tasks+0x5e4/0x640
[10047.807056][   T28]  watchdog+0x138/0x160
[10047.814140][   T28]  kthread+0x23c/0x260
[10047.821130][   T28]  ret_from_fork+0x10/0x18
[10047.829181][   T28] Kernel Offset: disabled
[10047.836274][   T28] CPU features: 0x0240002,20002004
[10047.844070][   T28] Memory Limit: none
[10047.853599][   T28] ---[ end Kernel panic - not syncing: hung_task:
blocked tasks ]---

if I build with KFENCE=n it boots up eventually, here's my .config file [2].

Any idea what may happen?

it happens on next-20201109 also, but it takes longer until we get the
"Call trace:".

Cheers,
Anders
[1] http://ix.io/2Ddv
[2] https://people.linaro.org/~anders.roxell/allmodconfig-next-20201105.config