linux-ext4 - Re: Lockdep warnings on kexec (virtio

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Message-ID: <adf6981fcfd3b23d0a293404879598e8fcf072f6.camel@infradead.org>
Date: Fri, 13 Dec 2024 09:43:07 +0000
From: David Woodhouse <dwmw2@...radead.org>
To: Thomas Gleixner <tglx@...utronix.de>, Stefan Hajnoczi
 <stefanha@...hat.com>,  Jason Wang <jasowang@...hat.com>
Cc: "x86@...nel.org" <x86@...nel.org>, hpa <hpa@...or.com>, dyoung
 <dyoung@...hat.com>, kexec <kexec@...ts.infradead.org>, linux-ext4
 <linux-ext4@...r.kernel.org>, "Michael S. Tsirkin" <mst@...hat.com>,
 Stefano Garzarella <sgarzare@...hat.com>, eperezma <eperezma@...hat.com>,
 Paolo Bonzini <bonzini@...hat.com>,  ming.lei@...hat.com, Petr Mladek
 <pmladek@...e.com>, John Ogness <jogness@...utronix.de>, Peter Zijlstra
 <peterz@...radead.org>
Subject: Re: Lockdep warnings on kexec (virtio_blk, hrtimers)

On Fri, 2024-12-13 at 09:31 +0000, David Woodhouse wrote:
> 
> (gdb) p sysrq_handle_showstate('t')
> 
> That didn't work. Maybe if I'd actually had no_console_suspend on this
> boot. Will try again.

With your fix I get the same thing (both CPUs in idle thread). And with
no_console_suspend on the command line, 'p sysrq_handle_showstate('t')'
does work...

[  113.462898] task:loadret         state:D stack:0     pid:707   tgid:707   ppid:531    flags:0x00004002
[  113.463615] Call Trace:
[  113.463841]  <TASK>
[  113.464029]  __schedule+0x502/0x1a10
[  113.464331]  ? find_held_lock+0x2b/0x80
[  113.464661]  ? schedule+0xea/0x140
[  113.464961]  schedule+0x3a/0x140
[  113.465234]  schedule_timeout+0xcc/0x110
[  113.465580]  __wait_for_common+0x91/0x1c0
[  113.465923]  ? __pfx_schedule_timeout+0x10/0x10
[  113.466304]  cpuhp_kick_ap_work+0x13e/0x390
[  113.466657]  _cpu_down+0xd4/0x370
[  113.466936]  freeze_secondary_cpus.cold+0x3f/0xd4
[  113.467326]  kernel_kexec+0xa2/0x1a0
[  113.467634]  __do_sys_reboot+0x206/0x250
[  113.467974]  do_syscall_64+0x95/0x180
[  113.468266]  ? kfree+0xdb/0x3a0
[  113.468542]  ? __x64_sys_kexec_load+0xa9/0xe0
[  113.468906]  ? kfree+0xdb/0x3a0
[  113.469177]  ? do_kexec_load+0x120/0x340
[  113.469525]  ? lockdep_hardirqs_on_prepare+0xdb/0x190
[  113.469940]  ? syscall_exit_to_user_mode+0x97/0x290
[  113.470338]  ? do_syscall_64+0xa1/0x180
[  113.470667]  ? trace_hardirqs_off+0x4b/0xc0
[  113.471021]  ? lockdep_hardirqs_on_prepare+0xdb/0x190
[  113.471414]  entry_SYSCALL_64_after_hwframe+0x76/0x7e

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