From: "Luck, Tony" <tony.luck@intel.com>
To: "Guilherme G. Piccoli" <gpiccoli@igalia.com>,
Petr Mladek <pmladek@suse.com>, Dinh Nguyen <dinguyen@kernel.org>
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Subject: RE: [PATCH 21/30] panic: Introduce the panic pre-reboot notifier list
Date: Mon, 16 May 2022 16:18:04 +0000 [thread overview]
Message-ID: <bed66b9467254a5a8bafc1983dad643a@intel.com> (raw)
In-Reply-To: <63a74b56-89ef-8d1f-d487-cdb986aab798@igalia.com>
> So, my reasoning here is: this notifier should fit the info list,
> definitely! But...it's very high risk for kdump. It deep dives into the
> regmap API (there are locks in such code) plus there is an (MM)IO write
> to the device and an ARM firmware call. So, despite the nature of this
> notifier _fits the informational list_, the _code is risky_ so we should
> avoid running it before a kdump.
>
> Now, we indeed have a chicken/egg problem: want to avoid it before
> kdump, BUT in case kdump is not set, kmsg_dump() (and console flushing,
> after your suggestion Petr) will run before it and not save collected
> information from EDAC PoV.
Would it be possible to have some global "kdump is configured + enabled" flag?
Then notifiers could make an informed choice on whether to deep dive to
get all the possible details (when there is no kdump) or just skim the high
level stuff (to maximize chance of getting a successful kdump).
-Tony
next prev parent reply other threads:[~2022-05-16 16:18 UTC|newest]
Thread overview: 183+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-27 22:48 [PATCH 00/30] The panic notifiers refactor Guilherme G. Piccoli
2022-04-27 22:48 ` [PATCH 01/30] x86/crash,reboot: Avoid re-disabling VMX in all CPUs on crash/restart Guilherme G. Piccoli
2022-05-09 12:32 ` Guilherme G. Piccoli
2022-05-09 15:52 ` Sean Christopherson
2022-05-10 20:11 ` Guilherme G. Piccoli
2022-04-27 22:48 ` [PATCH 02/30] ARM: kexec: Disable IRQs/FIQs also on crash CPUs shutdown path Guilherme G. Piccoli
2022-04-29 16:26 ` Michael Kelley (LINUX)
2022-04-29 18:20 ` Marc Zyngier
2022-04-29 21:38 ` Guilherme G. Piccoli
2022-04-29 21:45 ` Russell King (Oracle)
2022-04-29 21:56 ` Guilherme G. Piccoli
2022-04-29 22:00 ` Marc Zyngier
2022-04-27 22:48 ` [PATCH 03/30] notifier: Add panic notifiers info and purge trailing whitespaces Guilherme G. Piccoli
2022-04-27 22:48 ` [PATCH 04/30] firmware: google: Convert regular spinlock into trylock on panic path Guilherme G. Piccoli
2022-05-03 18:03 ` Evan Green
2022-05-03 19:12 ` Guilherme G. Piccoli
2022-05-03 21:56 ` Evan Green
2022-05-04 12:45 ` Guilherme G. Piccoli
2022-05-10 11:38 ` Petr Mladek
2022-05-10 13:04 ` Guilherme G. Piccoli
2022-05-10 17:20 ` Steven Rostedt
2022-05-10 19:40 ` John Ogness
2022-05-11 11:13 ` Petr Mladek
2022-04-27 22:48 ` [PATCH 05/30] misc/pvpanic: " Guilherme G. Piccoli
2022-05-10 12:14 ` Petr Mladek
2022-05-10 13:00 ` Guilherme G. Piccoli
2022-05-17 10:58 ` Petr Mladek
2022-05-17 13:03 ` Guilherme G. Piccoli
2022-04-27 22:49 ` [PATCH 06/30] soc: bcm: brcmstb: Document panic notifier action and remove useless header Guilherme G. Piccoli
2022-05-02 15:38 ` Florian Fainelli
2022-05-02 15:47 ` Guilherme G. Piccoli
2022-04-27 22:49 ` [PATCH 07/30] mips: ip22: Reword PANICED to PANICKED " Guilherme G. Piccoli
2022-05-04 20:32 ` Thomas Bogendoerfer
2022-05-04 21:26 ` Guilherme G. Piccoli
2022-04-27 22:49 ` [PATCH 08/30] powerpc/setup: Refactor/untangle panic notifiers Guilherme G. Piccoli
2022-05-05 18:55 ` Hari Bathini
2022-05-05 19:28 ` Guilherme G. Piccoli
2022-05-09 12:50 ` Guilherme G. Piccoli
2022-05-10 13:53 ` Michael Ellerman
2022-05-10 14:10 ` Guilherme G. Piccoli
2022-04-27 22:49 ` [PATCH 09/30] coresight: cpu-debug: Replace mutex with mutex_trylock on panic notifier Guilherme G. Piccoli
2022-04-28 8:11 ` Suzuki K Poulose
2022-04-29 14:01 ` Guilherme G. Piccoli
2022-05-09 13:09 ` Guilherme G. Piccoli
2022-05-09 16:14 ` Suzuki K Poulose
2022-05-09 16:26 ` Guilherme G. Piccoli
2022-04-27 22:49 ` [PATCH 10/30] alpha: Clean-up the panic notifier code Guilherme G. Piccoli
2022-05-09 14:13 ` Guilherme G. Piccoli
2022-05-10 14:16 ` Petr Mladek
2022-05-11 20:10 ` Guilherme G. Piccoli
2022-04-27 22:49 ` [PATCH 11/30] um: Improve panic notifiers consistency and ordering Guilherme G. Piccoli
2022-04-28 8:30 ` Johannes Berg
2022-04-29 15:46 ` Guilherme G. Piccoli
2022-05-10 14:28 ` Petr Mladek
2022-05-11 20:22 ` Guilherme G. Piccoli
2022-05-13 14:44 ` Johannes Berg
2022-05-15 22:12 ` Guilherme G. Piccoli
2022-04-27 22:49 ` [PATCH 12/30] parisc: Replace regular spinlock with spin_trylock on panic path Guilherme G. Piccoli
2022-04-28 16:55 ` Helge Deller
2022-04-29 14:34 ` Guilherme G. Piccoli
2022-05-23 20:40 ` Guilherme G. Piccoli
2022-05-23 21:31 ` Helge Deller
2022-05-23 21:55 ` Guilherme G. Piccoli
2022-04-27 22:49 ` [PATCH 13/30] s390/consoles: Improve panic notifiers reliability Guilherme G. Piccoli
2022-04-29 18:46 ` Heiko Carstens
2022-04-29 19:31 ` Guilherme G. Piccoli
2022-04-27 22:49 ` [PATCH 14/30] panic: Properly identify the panic event to the notifiers' callbacks Guilherme G. Piccoli
2022-05-10 15:16 ` Petr Mladek
2022-05-10 16:16 ` Guilherme G. Piccoli
2022-05-17 13:11 ` Petr Mladek
2022-05-17 15:19 ` Guilherme G. Piccoli
2022-04-27 22:49 ` [PATCH 15/30] bus: brcmstb_gisb: Clean-up panic/die notifiers Guilherme G. Piccoli
2022-05-02 15:38 ` Florian Fainelli
2022-05-02 15:50 ` Guilherme G. Piccoli
2022-05-10 15:28 ` Petr Mladek
2022-05-17 15:32 ` Guilherme G. Piccoli
2022-04-27 22:49 ` [PATCH 16/30] drivers/hv/vmbus, video/hyperv_fb: Untangle and refactor Hyper-V panic notifiers Guilherme G. Piccoli
2022-04-29 17:16 ` Michael Kelley (LINUX)
2022-04-29 22:35 ` Guilherme G. Piccoli
2022-05-03 18:13 ` Michael Kelley (LINUX)
2022-05-03 18:57 ` Guilherme G. Piccoli
2022-04-27 22:49 ` [PATCH 17/30] tracing: Improve panic/die notifiers Guilherme G. Piccoli
2022-04-29 9:22 ` Sergei Shtylyov
2022-04-29 13:23 ` Steven Rostedt
2022-04-29 13:46 ` Guilherme G. Piccoli
2022-04-29 13:56 ` Steven Rostedt
2022-04-29 14:44 ` Guilherme G. Piccoli
2022-05-11 11:45 ` Petr Mladek
2022-05-17 15:33 ` Guilherme G. Piccoli
2022-04-27 22:49 ` [PATCH 18/30] notifier: Show function names on notifier routines if DEBUG_NOTIFIERS is set Guilherme G. Piccoli
2022-04-28 1:01 ` Xiaoming Ni
2022-04-29 19:38 ` Guilherme G. Piccoli
2022-05-10 17:29 ` Steven Rostedt
2022-05-16 16:14 ` Guilherme G. Piccoli
2022-04-29 16:27 ` Michael Kelley (LINUX)
2022-04-27 22:49 ` [PATCH 19/30] panic: Add the panic hypervisor notifier list Guilherme G. Piccoli
2022-04-29 17:30 ` Michael Kelley (LINUX)
2022-04-29 18:04 ` Guilherme G. Piccoli
2022-05-03 17:44 ` Michael Kelley (LINUX)
2022-05-03 17:56 ` Guilherme G. Piccoli
2022-05-16 14:01 ` Petr Mladek
2022-05-16 15:06 ` Guilherme G. Piccoli
2022-05-16 16:02 ` Evan Green
2022-05-17 13:28 ` Petr Mladek
2022-05-17 16:37 ` Guilherme G. Piccoli
2022-05-18 7:33 ` Petr Mladek
2022-05-18 13:24 ` Guilherme G. Piccoli
2022-05-17 13:57 ` Petr Mladek
2022-05-17 16:42 ` Guilherme G. Piccoli
2022-05-18 7:38 ` Petr Mladek
2022-05-18 13:09 ` Guilherme G. Piccoli
2022-05-18 22:17 ` Scott Branden
2022-05-19 12:19 ` Guilherme G. Piccoli
2022-05-19 19:20 ` Scott Branden
2022-05-23 14:56 ` Guilherme G. Piccoli
2022-05-24 8:04 ` Petr Mladek
2022-05-18 7:58 ` Petr Mladek
2022-05-18 13:16 ` Guilherme G. Piccoli
2022-05-19 7:03 ` Petr Mladek
2022-05-19 12:07 ` Guilherme G. Piccoli
2022-04-27 22:49 ` [PATCH 20/30] panic: Add the panic informational " Guilherme G. Piccoli
2022-04-27 23:49 ` Paul E. McKenney
2022-04-28 8:14 ` Suzuki K Poulose
2022-04-29 14:50 ` Guilherme G. Piccoli
2022-05-16 14:11 ` Petr Mladek
2022-05-16 14:28 ` Guilherme G. Piccoli
2022-04-27 22:49 ` [PATCH 21/30] panic: Introduce the panic pre-reboot " Guilherme G. Piccoli
2022-04-28 14:13 ` Alex Elder
2022-04-28 16:26 ` Corey Minyard
2022-04-29 15:18 ` Guilherme G. Piccoli
2022-04-29 16:04 ` Max Filippov
2022-04-29 19:34 ` Guilherme G. Piccoli
2022-05-16 14:33 ` Petr Mladek
2022-05-16 16:05 ` Guilherme G. Piccoli
2022-05-16 16:18 ` Luck, Tony [this message]
2022-05-16 16:33 ` Guilherme G. Piccoli
2022-05-17 14:11 ` Petr Mladek
2022-05-17 16:45 ` Guilherme G. Piccoli
2022-05-17 17:02 ` Luck, Tony
2022-05-17 18:12 ` Guilherme G. Piccoli
2022-05-17 19:07 ` Luck, Tony
2022-04-27 22:49 ` [PATCH 22/30] panic: Introduce the panic post-reboot " Guilherme G. Piccoli
2022-05-09 14:16 ` Guilherme G. Piccoli
2022-05-11 16:45 ` Heiko Carstens
2022-05-11 19:58 ` Guilherme G. Piccoli
2022-05-16 14:45 ` Petr Mladek
2022-05-16 16:08 ` Guilherme G. Piccoli
2022-04-27 22:49 ` [PATCH 23/30] printk: kmsg_dump: Introduce helper to inform number of dumpers Guilherme G. Piccoli
2022-05-10 17:40 ` Steven Rostedt
2022-05-11 20:03 ` Guilherme G. Piccoli
2022-05-16 14:50 ` Petr Mladek
2022-05-16 16:09 ` Guilherme G. Piccoli
2022-04-27 22:49 ` [PATCH 24/30] panic: Refactor the panic path Guilherme G. Piccoli
2022-04-28 0:28 ` Randy Dunlap
2022-04-29 16:04 ` Guilherme G. Piccoli
2022-05-09 14:25 ` Guilherme G. Piccoli
2022-04-29 17:53 ` Michael Kelley (LINUX)
2022-04-29 20:38 ` Guilherme G. Piccoli
2022-05-03 17:31 ` Michael Kelley (LINUX)
2022-05-03 18:06 ` Guilherme G. Piccoli
2022-05-09 15:16 ` d.hatayama
2022-05-09 16:39 ` Guilherme G. Piccoli
2022-05-12 14:03 ` Petr Mladek
2022-05-15 22:47 ` Guilherme G. Piccoli
2022-05-16 10:21 ` Petr Mladek
2022-05-16 16:32 ` Guilherme G. Piccoli
2022-05-19 23:45 ` Baoquan He
2022-05-20 11:23 ` Guilherme G. Piccoli
2022-05-24 8:01 ` Petr Mladek
2022-05-24 10:18 ` Baoquan He
2022-05-24 8:32 ` Baoquan He
2022-05-24 14:44 ` Eric W. Biederman
2022-05-26 16:25 ` Guilherme G. Piccoli
2022-06-14 14:36 ` Petr Mladek
2022-06-15 9:36 ` Guilherme G. Piccoli
2022-04-27 22:49 ` [PATCH 25/30] panic, printk: Add console flush parameter and convert panic_print to a notifier Guilherme G. Piccoli
2022-05-16 14:56 ` Petr Mladek
2022-05-16 16:11 ` Guilherme G. Piccoli
2022-04-27 22:49 ` [PATCH 26/30] Drivers: hv: Do not force all panic notifiers to execute before kdump Guilherme G. Piccoli
2022-04-27 22:49 ` [PATCH 27/30] powerpc: " Guilherme G. Piccoli
2022-04-27 22:49 ` [PATCH 28/30] panic: Unexport crash_kexec_post_notifiers Guilherme G. Piccoli
2022-04-27 22:49 ` [PATCH 29/30] powerpc: ps3, pseries: Avoid duplicate call to kmsg_dump() on panic Guilherme G. Piccoli
2022-04-27 22:49 ` [PATCH 30/30] um: Avoid duplicate call to kmsg_dump() Guilherme G. Piccoli
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