Re: What to do about "WARNING: negative runtime; monotonic clock has gone backwards"

[Brad Spencer <brad%anduin.eldar.org@localhost>]

Taylor R Campbell <riastradh%NetBSD.org@localhost> writes:

>> Date: Fri, 28 Jul 2023 07:42:04 -0400
>> From: Brad Spencer <brad%anduin.eldar.org@localhost>
>> 
>> dtrace: invalid probe specifier sdt:xen:hardclock:jump { @ = quantize(arg1 - arg0) } tick-10s { printa(@) }: probe description :::tick-10s does not match any probes
>
> modload dtrace_profile

Thanks, that allowed the dtrace to execute, but I never have time to
execute the second probe, as this kernel panic occures within a few
seconds of the first probe being run (probably on the order of 4 - 5
seconds):

[ 213.9904671] fatal page fault in supervisor mode
[ 213.9904671] trap type 6 code 0 rip 0xffffffff824d29ad cs 0xe030 rflags 0x10283 cr2 0xd8 ilevel 0x7 rsp 0xffff92032de8db58
[ 213.9904671] curlwp 0xffff92001784e9c0 pid 0.16 lowest kstack 0xffff92032de892c0
kernel: page fault trap, code=0
Stopped in pid 0.16 (system) at cyclic:cyclic_clock+0x86:       movq    d8(%rbx)
,%rax
cyclic_clock() at cyclic:cyclic_clock+0x86
hardclock() at netbsd:hardclock+0x8f
xen_timer_handler() at netbsd:xen_timer_handler+0x95
evtchn_do_event() at netbsd:evtchn_do_event+0x11c
do_hypervisor_callback() at netbsd:do_hypervisor_callback+0x17e
Xhandle_hypervisor_callback() at netbsd:Xhandle_hypervisor_callback+0x1a
--- interrupt ---
hypercall_page() at netbsd:hypercall_page+0x3aa
idle_loop() at netbsd:idle_loop+0x147
cpu_hatch() at netbsd:cpu_hatch+0x19c
ds          58f5
es          f72a
fs          196
gs          246
rdi         ffff92032de8db78
rsi         0
rbp         ffff92032de8dbb8
rbx         0
rdx         d5
rcx         658f5
rax         1
r8          ffff920017834000
r9          399fcd6a
r10         a9d32cec93
r11         963bca08
r12         1
r13         31d2d365f4
r14         ffffffff823f9460    solaris_cpu+0x40
r15         321e02ef47
rip         ffffffff824d29ad    cyclic_clock+0x86
cs          e030
rflags      10283
rsp         ffff92032de8db58
ss          e02b
cyclic:cyclic_clock+0x86:       movq    d8(%rbx),%rax
db{1}> bt
cyclic_clock() at cyclic:cyclic_clock+0x86
hardclock() at netbsd:hardclock+0x8f
xen_timer_handler() at netbsd:xen_timer_handler+0x95
evtchn_do_event() at netbsd:evtchn_do_event+0x11c
do_hypervisor_callback() at netbsd:do_hypervisor_callback+0x17e
Xhandle_hypervisor_callback() at netbsd:Xhandle_hypervisor_callback+0x1a
--- interrupt ---
hypercall_page() at netbsd:hypercall_page+0x3aa
idle_loop() at netbsd:idle_loop+0x147
cpu_hatch() at netbsd:cpu_hatch+0x19c




-- 
Brad Spencer - brad%anduin.eldar.org@localhost - KC8VKS - http://anduin.eldar.org