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Date:      Wed, 2 Mar 2022 19:26:18 +0200
From:      Ze Dupsys <zedupsys@gmail.com>
To:        =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= <roger.pau@citrix.com>
Cc:        freebsd-xen@freebsd.org, buhrow@nfbcal.org
Subject:   Re: ZFS + FreeBSD XEN dom0 panic
Message-ID:  <CAOEWpzfsajhbvXfAw5-F1p83jjmSggobANBEyeYFAfiumAWRCA@mail.gmail.com>
In-Reply-To: <Yh93uLIBqk5NC2xf@Air-de-Roger>
References:  <CAOEWpzc2WVViMJHrrtuU-G_7yck4eehm6b=JQPSZU1MH-bzmiw@mail.gmail.com> <202203011540.221FeR4f028103@nfbcal.org> <CAOEWpzdC41ithfd7R_qa66%2Bsh_UXeku7OcVC_b%2BXUaLr_9SSTA@mail.gmail.com> <Yh93uLIBqk5NC2xf@Air-de-Roger>

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Today managed to crash lab Dom0 with:
xen_cmdline=3D"dom0_mem=3D6144M dom0_max_vcpus=3D2 dom0=3Dpvh,verbose=3D1
console=3Dvga,com1 com1=3D9600,8n1 guest_loglvl=3Dall loglvl=3Dall sync_con=
sole=3D1
reboot=3Dno"

I wrote ' vmstat -m | sort -k 2 -r' each 120 seconds, the latest one was as
in attachment, panic was with the same fingerprint as the one with
"rman_is_region_manager" line already reported.

The scripts i ran in parallel generally were the same as attached in bug
report, just a bit modified.
1) ./libexec.sh zfs_volstress_fast_4g (this just creates new ZVOLs and
instead of 2GB, it writes 4BG in each ZVOL created dd if=3D/dev/zero)
2)  ./test_vm1_zvol_3gb.sh (this loops commands: start first DomU, write
3GB in it's /tmp, restart DomU, removes /tmp, repeat)
3) ./test_vm2_zvol_5_on_off.sh (this loops: start second DomU, which has 5
disks attached, turn off DomU, repeat)
4) monitoring, sleep 120 seconds, print vmstat | sort in serial output.

Around dom id 108, system started to behave suspiciously, xl list showed
DomUs created, but they did not really start up, script timeout-ed for ssh
connection, no vnc. When i did xl destroy manually, and xl create, system
panic happened.

I have log files for all serial output, if there is anything useful, i can
provide. On disk log files seems to loose latest messages due to crash.


On Wed, Mar 2, 2022 at 3:57 PM Roger Pau Monn=C3=A9 <roger.pau@citrix.com> =
wrote:

> On Wed, Mar 02, 2022 at 10:57:37AM +0200, Ze Dupsys wrote:
> > Hello,
> >
> > I started using XEN on one pre-production machine (with aim to use late=
r
> in
> > production) with 12.2, but since it experienced random crashes i update=
d
> to
> > 13.0 in hope that errors might disappear.
> >
> > I do not know how detailed should i write, so that this email is not to=
o
> > long, but gives enough info.
> >
> > FreeBSD Dom0 is installed on ZFS, somewhat basic install, IPFW and rule=
s
> > for NATting are used. Zpool is composed of 2 mirrored disks. There is a
> > ZVOL volmode=3Ddev for each VM and VM's jail that are attached as raw
> devices
> > to DomU. At the moment DomUs contain FreeBSD, some 12.0 to 13.0, UFS,
> with
> > VNET jails, epairs all bridged to DomU's xn0 interface. On Dom0 i have
> > bridge interfaces, where DomU's are connected depending on their
> > "zone/network", those that have allowed outgoing connections are NATted
> by
> > IPFW on specific physical NIC and IP.
>
> So from the traces on the ticket:
>
> panic: pmap_growkernel: no memory to grow kernel
> cpuid =3D 0
> time =3D 1646123072
> KDB: stack backtrace:
> #0 0xffffffff80c57525 at kdb_backtrace+0x65
> #1 0xffffffff80c09f01 at vpanic+0x181
> #2 0xffffffff80c09d73 at panic+0x43
> #3 0xffffffff81073eed at pmap_growkernel+0x27d
> #4 0xffffffff80f2dae8 at vm_map_insert+0x248
> #5 0xffffffff80f30249 at vm_map_find+0x549
> #6 0xffffffff80f2bf76 at kmem_init+0x226
> #7 0xffffffff80c73341 at vmem_xalloc+0xcb1
> #8 0xffffffff80c72c3b at vmem_xalloc+0x5ab
> #9 0xffffffff80f2bfce at kmem_init+0x27e
> #10 0xffffffff80c73341 at vmem_xalloc+0xcb1
> #11 0xffffffff80c72c3b at vmem_xalloc+0x5ab
> #12 0xffffffff80c72646 at vmem_alloc+0x46
> #13 0xffffffff80f2b616 at kmem_malloc_domainset+0x96
> #14 0xffffffff80f21a2a at uma_prealloc+0x23a
> #15 0xffffffff80f235de at sysctl_handle_uma_zone_cur+0xe2e
> #16 0xffffffff80f1f6af at uma_set_align+0x8f
> #17 0xffffffff82463362 at abd_borrow_buf_copy+0x22
> Uptime: 4m9s
>
>
> Fatal trap 12: page fault while in kernel mode
> cpuid =3D 0; apic id =3D 00
> fault virtual address   =3D 0x22710028
> fault code              =3D supervisor read data, page not present
> instruction pointer     =3D 0x20:0xffffffff80c45892
> stack pointer           =3D 0x28:0xfffffe0096600930
> frame pointer           =3D 0x28:0xfffffe0096600930
> code segment            =3D base rx0, limit 0xfffff, type 0x1b
>                         =3D DPL 0, pres 1, long 1, def32 0, gran 1
> processor eflags        =3D interrupt enabled, resume, IOPL =3D 0
> current process         =3D 1496 (devmatch)
> trap number             =3D 12
> panic: page fault
> cpuid =3D 0
> time =3D 1646123791
> KDB: stack backtrace:
> #0 0xffffffff80c57525 at kdb_backtrace+0x65
> #1 0xffffffff80c09f01 at vpanic+0x181
> #2 0xffffffff80c09d73 at panic+0x43
> #3 0xffffffff8108b1a7 at trap+0xbc7
> #4 0xffffffff8108b1ff at trap+0xc1f
> #5 0xffffffff8108a85d at trap+0x27d
> #6 0xffffffff81061b18 at calltrap+0x8
> #7 0xffffffff80c62011 at rman_is_region_manager+0x241
> #8 0xffffffff80c1a051 at sbuf_new_for_sysctl+0x101
> #9 0xffffffff80c1949c at kernel_sysctl+0x43c
> #10 0xffffffff80c19b13 at userland_sysctl+0x173
> #11 0xffffffff80c1995f at sys___sysctl+0x5f
> #12 0xffffffff8108baac at amd64_syscall+0x10c
> #13 0xffffffff8106243e at Xfast_syscall+0xfe
>
>
> Fatal trap 12: page fault while in kernel mode
> cpuid =3D 1; apic id =3D 02
> fault virtual address   =3D 0x68
> fault code              =3D supervisor read data, page not present
> instruction pointer     =3D 0x20:0xffffffff824a599d
> stack pointer           =3D 0x28:0xfffffe00b1e27910
> frame pointer           =3D 0x28:0xfffffe00b1e279b0
> code segment            =3D base rx0, limit 0xfffff, type 0x1b
>                         =3D DPL 0, pres 1, long 1, def32 0, gran 1
> processor eflags        =3D interrupt enabled, resume, IOPL =3D 0
> current process         =3D 0 (xbbd7 taskq)
> trap number             =3D 12
> panic: page fault
> cpuid =3D 1
> time =3D 1646122723
> KDB: stack backtrace:
> #0 0xffffffff80c57525 at kdb_backtrace+0x65
> #1 0xffffffff80c09f01 at vpanic+0x181
> #2 0xffffffff80c09d73 at panic+0x43
> #3 0xffffffff8108b1a7 at trap+0xbc7
> #4 0xffffffff8108b1ff at trap+0xc1f
> #5 0xffffffff8108a85d at trap+0x27d
> #6 0xffffffff81061b18 at calltrap+0x8
> #7 0xffffffff8248935a at dmu_read+0x2a
> #8 0xffffffff82456a3a at zvol_geom_bio_strategy+0x2aa
> #9 0xffffffff80a7f214 at xbd_instance_create+0xa394
> #10 0xffffffff80a7b1ea at xbd_instance_create+0x636a
> #11 0xffffffff80c6b1c1 at taskqueue_run+0x2a1
> #12 0xffffffff80c6c4dc at taskqueue_thread_loop+0xac
> #13 0xffffffff80bc7e3e at fork_exit+0x7e
> #14 0xffffffff81062b9e at fork_trampoline+0xe
> Uptime: 1h44m10s
>
> This all look to me like Out of Memory conditions, can you check with
> `top` whats going on with your memory?
>
> Might also be helpful to record periodic calls to `vmstat -m | sort -k
> 2 -r` to try to figure out what's using so much memory.
>
> Regards, Roger.
>

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<div dir=3D"ltr"><div>Today managed to crash lab Dom0 with:</div><div>xen_c=
mdline=3D&quot;dom0_mem=3D6144M dom0_max_vcpus=3D2 dom0=3Dpvh,verbose=3D1 c=
onsole=3Dvga,com1 com1=3D9600,8n1 guest_loglvl=3Dall loglvl=3Dall sync_cons=
ole=3D1 reboot=3Dno&quot;</div><div><br></div><div>I wrote &#39;
vmstat -m | sort -k 2 -r&#39; each 120 seconds, the latest one was as in at=
tachment, panic was with the same fingerprint as the one with &quot;rman_is=
_region_manager&quot; line already reported.<br></div><div><br></div><div>T=
he scripts i ran in parallel generally were the same as attached in bug rep=
ort, just a bit modified.</div><div>1) ./libexec.sh zfs_volstress_fast_4g (=
this just creates new ZVOLs and instead of 2GB, it writes 4BG in each ZVOL =
created dd if=3D/dev/zero) <br></div><div>2)=C2=A0 ./test_vm1_zvol_3gb.sh (=
this loops commands: start first DomU, write 3GB in it&#39;s /tmp, restart =
DomU, removes /tmp, repeat)</div><div>3) ./test_vm2_zvol_5_on_off.sh (this =
loops: start second DomU, which has 5 disks attached, turn off DomU, repeat=
)<br></div><div>4) monitoring, sleep 120 seconds, print vmstat | sort in se=
rial output.<br></div><div><br></div><div>Around dom id 108, system started=
 to behave suspiciously, xl list showed DomUs created, but they did not rea=
lly start up, script timeout-ed for ssh connection, no vnc. When i did xl d=
estroy manually, and xl create, system panic happened.</div><div><br></div>=
<div>I have log files for all serial output, if there is anything useful, i=
 can provide. On disk log files seems to loose latest messages due to crash=
.<br></div><br></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Wed, Mar 2, 2022 at 3:57 PM Roger Pau Monn=C3=A9 &lt;<a =
href=3D"mailto:roger.pau@citrix.com">roger.pau@citrix.com</a>&gt; wrote:<br=
></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;=
border-left:1px solid rgb(204,204,204);padding-left:1ex">On Wed, Mar 02, 20=
22 at 10:57:37AM +0200, Ze Dupsys wrote:<br>
&gt; Hello,<br>
&gt; <br>
&gt; I started using XEN on one pre-production machine (with aim to use lat=
er in<br>
&gt; production) with 12.2, but since it experienced random crashes i updat=
ed to<br>
&gt; 13.0 in hope that errors might disappear.<br>
&gt; <br>
&gt; I do not know how detailed should i write, so that this email is not t=
oo<br>
&gt; long, but gives enough info.<br>
&gt; <br>
&gt; FreeBSD Dom0 is installed on ZFS, somewhat basic install, IPFW and rul=
es<br>
&gt; for NATting are used. Zpool is composed of 2 mirrored disks. There is =
a<br>
&gt; ZVOL volmode=3Ddev for each VM and VM&#39;s jail that are attached as =
raw devices<br>
&gt; to DomU. At the moment DomUs contain FreeBSD, some 12.0 to 13.0, UFS, =
with<br>
&gt; VNET jails, epairs all bridged to DomU&#39;s xn0 interface. On Dom0 i =
have<br>
&gt; bridge interfaces, where DomU&#39;s are connected depending on their<b=
r>
&gt; &quot;zone/network&quot;, those that have allowed outgoing connections=
 are NATted by<br>
&gt; IPFW on specific physical NIC and IP.<br>
<br>
So from the traces on the ticket:<br>
<br>
panic: pmap_growkernel: no memory to grow kernel<br>
cpuid =3D 0<br>
time =3D 1646123072<br>
KDB: stack backtrace:<br>
#0 0xffffffff80c57525 at kdb_backtrace+0x65<br>
#1 0xffffffff80c09f01 at vpanic+0x181<br>
#2 0xffffffff80c09d73 at panic+0x43<br>
#3 0xffffffff81073eed at pmap_growkernel+0x27d<br>
#4 0xffffffff80f2dae8 at vm_map_insert+0x248<br>
#5 0xffffffff80f30249 at vm_map_find+0x549<br>
#6 0xffffffff80f2bf76 at kmem_init+0x226<br>
#7 0xffffffff80c73341 at vmem_xalloc+0xcb1<br>
#8 0xffffffff80c72c3b at vmem_xalloc+0x5ab<br>
#9 0xffffffff80f2bfce at kmem_init+0x27e<br>
#10 0xffffffff80c73341 at vmem_xalloc+0xcb1<br>
#11 0xffffffff80c72c3b at vmem_xalloc+0x5ab<br>
#12 0xffffffff80c72646 at vmem_alloc+0x46<br>
#13 0xffffffff80f2b616 at kmem_malloc_domainset+0x96<br>
#14 0xffffffff80f21a2a at uma_prealloc+0x23a<br>
#15 0xffffffff80f235de at sysctl_handle_uma_zone_cur+0xe2e<br>
#16 0xffffffff80f1f6af at uma_set_align+0x8f<br>
#17 0xffffffff82463362 at abd_borrow_buf_copy+0x22<br>
Uptime: 4m9s<br>
<br>
<br>
Fatal trap 12: page fault while in kernel mode<br>
cpuid =3D 0; apic id =3D 00<br>
fault virtual address=C2=A0 =C2=A0=3D 0x22710028<br>
fault code=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =3D supervisor r=
ead data, page not present<br>
instruction pointer=C2=A0 =C2=A0 =C2=A0=3D 0x20:0xffffffff80c45892<br>
stack pointer=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=3D 0x28:0xfffffe0096=
600930<br>
frame pointer=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=3D 0x28:0xfffffe0096=
600930<br>
code segment=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =3D base rx0, limit 0=
xfffff, type 0x1b<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =3D DPL 0, pres 1, long 1, def32 0, gran 1<br>
processor eflags=C2=A0 =C2=A0 =C2=A0 =C2=A0 =3D interrupt enabled, resume, =
IOPL =3D 0<br>
current process=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=3D 1496 (devmatch)<br>
trap number=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=3D 12<br>
panic: page fault<br>
cpuid =3D 0<br>
time =3D 1646123791<br>
KDB: stack backtrace:<br>
#0 0xffffffff80c57525 at kdb_backtrace+0x65<br>
#1 0xffffffff80c09f01 at vpanic+0x181<br>
#2 0xffffffff80c09d73 at panic+0x43<br>
#3 0xffffffff8108b1a7 at trap+0xbc7<br>
#4 0xffffffff8108b1ff at trap+0xc1f<br>
#5 0xffffffff8108a85d at trap+0x27d<br>
#6 0xffffffff81061b18 at calltrap+0x8<br>
#7 0xffffffff80c62011 at rman_is_region_manager+0x241<br>
#8 0xffffffff80c1a051 at sbuf_new_for_sysctl+0x101<br>
#9 0xffffffff80c1949c at kernel_sysctl+0x43c<br>
#10 0xffffffff80c19b13 at userland_sysctl+0x173<br>
#11 0xffffffff80c1995f at sys___sysctl+0x5f<br>
#12 0xffffffff8108baac at amd64_syscall+0x10c<br>
#13 0xffffffff8106243e at Xfast_syscall+0xfe<br>
<br>
<br>
Fatal trap 12: page fault while in kernel mode<br>
cpuid =3D 1; apic id =3D 02<br>
fault virtual address=C2=A0 =C2=A0=3D 0x68<br>
fault code=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =3D supervisor r=
ead data, page not present<br>
instruction pointer=C2=A0 =C2=A0 =C2=A0=3D 0x20:0xffffffff824a599d<br>
stack pointer=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=3D 0x28:0xfffffe00b1=
e27910<br>
frame pointer=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=3D 0x28:0xfffffe00b1=
e279b0<br>
code segment=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =3D base rx0, limit 0=
xfffff, type 0x1b<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =3D DPL 0, pres 1, long 1, def32 0, gran 1<br>
processor eflags=C2=A0 =C2=A0 =C2=A0 =C2=A0 =3D interrupt enabled, resume, =
IOPL =3D 0<br>
current process=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=3D 0 (xbbd7 taskq)<br>
trap number=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=3D 12<br>
panic: page fault<br>
cpuid =3D 1<br>
time =3D 1646122723<br>
KDB: stack backtrace:<br>
#0 0xffffffff80c57525 at kdb_backtrace+0x65<br>
#1 0xffffffff80c09f01 at vpanic+0x181<br>
#2 0xffffffff80c09d73 at panic+0x43<br>
#3 0xffffffff8108b1a7 at trap+0xbc7<br>
#4 0xffffffff8108b1ff at trap+0xc1f<br>
#5 0xffffffff8108a85d at trap+0x27d<br>
#6 0xffffffff81061b18 at calltrap+0x8<br>
#7 0xffffffff8248935a at dmu_read+0x2a<br>
#8 0xffffffff82456a3a at zvol_geom_bio_strategy+0x2aa<br>
#9 0xffffffff80a7f214 at xbd_instance_create+0xa394<br>
#10 0xffffffff80a7b1ea at xbd_instance_create+0x636a<br>
#11 0xffffffff80c6b1c1 at taskqueue_run+0x2a1<br>
#12 0xffffffff80c6c4dc at taskqueue_thread_loop+0xac<br>
#13 0xffffffff80bc7e3e at fork_exit+0x7e<br>
#14 0xffffffff81062b9e at fork_trampoline+0xe<br>
Uptime: 1h44m10s<br>
<br>
This all look to me like Out of Memory conditions, can you check with<br>
`top` whats going on with your memory?<br>
<br>
Might also be helpful to record periodic calls to `vmstat -m | sort -k<br>
2 -r` to try to figure out what&#39;s using so much memory.<br>
<br>
Regards, Roger.<br>
</blockquote></div>

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