Date: Fri, 27 Jun 2025 16:52:53 -0400 From: Alexander Motin <mav@freebsd.org> To: Steve Kargl <sgk@troutmask.apl.washington.edu> Cc: FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: Panic with "Unrecoverable machine check exception" Message-ID: <CAO4K=PVzT6f-n=XyT=CDWaO0YUi1Czw%2B5pWAvgTskJL%2BO6iFSQ@mail.gmail.com> In-Reply-To: <aF7-HDLrosQqa0m0@troutmask.apl.washington.edu>
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[-- Attachment #1 --]
Hi.
It is likely a hardware failure, unless a false positive. Check last
console logs or better BMC logs for detail.
On Fri, Jun 27, 2025, 16:26 Steve Kargl <sgk@troutmask.apl.washington.edu>
wrote:
> Never seen this type of panic. I can upload
> core.txt.4 and info.4 to freefall if someone
> wants more details.
>
>
> __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:57
> 57 __asm("movq %%gs:%c1,%0" : "=r" (td)
> (kgdb) #0 __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:57
> td = <optimized out>
> #1 doadump (textdump=textdump@entry=1)
> at /usr/src/sys/kern/kern_shutdown.c:399
> error = 0
> coredump = <optimized out>
> #2 0xffffffff80676e30 in kern_reboot (howto=260)
> at /usr/src/sys/kern/kern_shutdown.c:519
> once = 0
> __pc = 0x0
> #3 0xffffffff80677367 in vpanic (
> fmt=0xffffffff80abdb94 "Unrecoverable machine check exception",
> ap=ap@entry=0xfffffe001c024ed0) at
> /usr/src/sys/kern/kern_shutdown.c:974
> buf = "Unrecoverable machine check exception", '\000' <repeats 218
> times>
> __pc = 0x0
> __pc = 0x0
> __pc = 0x0
> other_cpus = {__bits = {251, 0 <repeats 15 times>}}
> td = 0xfffff80004601000
> bootopt = <unavailable>
> newpanic = <optimized out>
> #4 0xffffffff80677193 in panic (fmt=<unavailable>)
> at /usr/src/sys/kern/kern_shutdown.c:887
> ap = {{gp_offset = 8, fp_offset = 48,
> overflow_arg_area = 0xfffffe001c024f00,
> reg_save_area = 0xfffffe001c024ea0}}
> #5 0xffffffff809d391b in mca_intr () at /usr/src/sys/x86/x86/mca.c:1540
> recoverable = false
> mcg_status = <optimized out>
> count = <optimized out>
> lmcs = <optimized out>
> #6 <signal handler called>
> No locals.
> #7 mi_switch (flags=flags@entry=262) at
> /usr/src/sys/kern/kern_synch.c:537
> __pc = 0x0
> __pc = 0x0
> __pc = 0x0
> __pc = 0x0
> __pc = 0x0
> td = 0xfffff80004601000
> new_switchtime = <optimized out>
> runtime = <optimized out>
> #8 0xffffffff806aaca4 in sched_idletd (dummy=dummy@entry=0x0)
> at /usr/src/sys/kern/sched_4bsd.c:1688
> __pc = 0x0
> stat = <optimized out>
> #9 0xffffffff806324b2 in fork_exit (
> callout=0xffffffff806aac50 <sched_idletd>, arg=0x0,
> frame=0xfffffe00d5407f40) at /usr/src/sys/kern/kern_fork.c:1153
> __pc = 0x0
> __pc = 0x0
> td = 0xfffff80004601000
> p = 0xfffffe00c3002040
> dtd = <optimized out>
> #10 <signal handler called>
>
>
>
>
>
>
> --
> Steve
>
> --
Alexander Motin
[-- Attachment #2 --]
<div dir="auto"><div dir="auto"><div>Hi.</div><div dir="auto"><br></div><div dir="auto">It is likely a hardware failure, unless a false positive. Check last console logs or better BMC logs for detail.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jun 27, 2025, 16:26 Steve Kargl <<a href="mailto:sgk@troutmask.apl.washington.edu" target="_blank" rel="noreferrer">sgk@troutmask.apl.washington.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Never seen this type of panic. I can upload <br>
core.txt.4 and info.4 to freefall if someone<br>
wants more details.<br>
<br>
<br>
__curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:57<br>
57 __asm("movq %%gs:%c1,%0" : "=r" (td)<br>
(kgdb) #0 __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:57<br>
td = <optimized out><br>
#1 doadump (textdump=textdump@entry=1)<br>
at /usr/src/sys/kern/kern_shutdown.c:399<br>
error = 0<br>
coredump = <optimized out><br>
#2 0xffffffff80676e30 in kern_reboot (howto=260)<br>
at /usr/src/sys/kern/kern_shutdown.c:519<br>
once = 0<br>
__pc = 0x0<br>
#3 0xffffffff80677367 in vpanic (<br>
fmt=0xffffffff80abdb94 "Unrecoverable machine check exception", <br>
ap=ap@entry=0xfffffe001c024ed0) at /usr/src/sys/kern/kern_shutdown.c:974<br>
buf = "Unrecoverable machine check exception", '\000' <repeats 218 times><br>
__pc = 0x0<br>
__pc = 0x0<br>
__pc = 0x0<br>
other_cpus = {__bits = {251, 0 <repeats 15 times>}}<br>
td = 0xfffff80004601000<br>
bootopt = <unavailable><br>
newpanic = <optimized out><br>
#4 0xffffffff80677193 in panic (fmt=<unavailable>)<br>
at /usr/src/sys/kern/kern_shutdown.c:887<br>
ap = {{gp_offset = 8, fp_offset = 48, <br>
overflow_arg_area = 0xfffffe001c024f00, <br>
reg_save_area = 0xfffffe001c024ea0}}<br>
#5 0xffffffff809d391b in mca_intr () at /usr/src/sys/x86/x86/mca.c:1540<br>
recoverable = false<br>
mcg_status = <optimized out><br>
count = <optimized out><br>
lmcs = <optimized out><br>
#6 <signal handler called><br>
No locals.<br>
#7 mi_switch (flags=flags@entry=262) at /usr/src/sys/kern/kern_synch.c:537<br>
__pc = 0x0<br>
__pc = 0x0<br>
__pc = 0x0<br>
__pc = 0x0<br>
__pc = 0x0<br>
td = 0xfffff80004601000<br>
new_switchtime = <optimized out><br>
runtime = <optimized out><br>
#8 0xffffffff806aaca4 in sched_idletd (dummy=dummy@entry=0x0)<br>
at /usr/src/sys/kern/sched_4bsd.c:1688<br>
__pc = 0x0<br>
stat = <optimized out><br>
#9 0xffffffff806324b2 in fork_exit (<br>
callout=0xffffffff806aac50 <sched_idletd>, arg=0x0, <br>
frame=0xfffffe00d5407f40) at /usr/src/sys/kern/kern_fork.c:1153<br>
__pc = 0x0<br>
__pc = 0x0<br>
td = 0xfffff80004601000<br>
p = 0xfffffe00c3002040<br>
dtd = <optimized out><br>
#10 <signal handler called><br>
<br>
<br>
<br>
<br>
<br>
<br>
-- <br>
Steve<br>
<br>
</blockquote></div><div data-smartmail="gmail_signature">-- <br>Alexander Motin</div></div>
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