Date: Fri, 27 Jun 2025 13:25:14 -0700 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: freebsd-current@freebsd.org Subject: Panic with "Unrecoverable machine check exception" Message-ID: <aF7-HDLrosQqa0m0@troutmask.apl.washington.edu>
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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
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