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Message-ID: <20180522000614.GA21542@agluck-desk>
Date: Mon, 21 May 2018 17:06:14 -0700
From: "Luck, Tony" <tony.luck@...el.com>
To: Jeffrin Thalakkottoor <jeffrin@...agiritech.edu.in>
Cc: Borislav Petkov <bp@...en8.de>,
Thomas Gleixner <tglx@...utronix.de>, mingo@...hat.com,
hpa@...or.com, x86@...nel.org, linux-edac@...r.kernel.org,
lkml <linux-kernel@...r.kernel.org>
Subject: Re: PROBLEM: mce: [Hardware Error] from dmesg -l emerg
On Tue, May 22, 2018 at 02:43:37AM +0530, Jeffrin Thalakkottoor wrote:
> mce: [Hardware Error]: CPU 0: Machine Check: 0 Bank 5: ee0000000040110b
> mce: [Hardware Error]: TSC 0 ADDR 160000080 MISC 5040008086
> mce: [Hardware Error]: PROCESSOR 0:306d4 TIME 1526932210 SOCKET 0 APIC
> 0 microcode 2a
The problem is that "mcelog --ascii" is expecting the first line to
look like:
CPU 0: Machine Check Exception: 0 Bank 5: ee0000000040110b
This seems to have been broken by commit:
cd9c57cad3fe ("x86/MCE: Dump MCE to dmesg if no consumers")
relevent part is this ... where we now conditionally include the
word "Exception".
-static void print_mce(struct mce *m)
+static void __print_mce(struct mce *m)
{
- int ret = 0;
-
- pr_emerg(HW_ERR "CPU %d: Machine Check Exception: %Lx Bank %d: %016Lx\n",
- m->extcpu, m->mcgstatus, m->bank, m->status);
+ pr_emerg(HW_ERR "CPU %d: Machine Check%s: %Lx Bank %d: %016Lx\n",
+ m->extcpu,
+ (m->mcgstatus & MCG_STATUS_MCIP ? " Exception" : ""),
+ m->mcgstatus, m->bank, m->status);
While this is a bit easier to read, no new information is included as we
do print the value of m->mcgstatus.
Sadly, the change was made back in v4.10 ... so reverting it won't
help all the people running kernels built in the last fifteen months :-(
I'll see if I can get Andi to take a patch for mcelog to accept the
line with or without the " Exception".
Oh ... one more thing. Did your e-mail client line wrap that last line?
> mce: [Hardware Error]: PROCESSOR 0:306d4 TIME 1526932210 SOCKET 0 APIC
> 0 microcode 2a
That should all be on one line.
-Tony
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