[arch-releng] regression with race condition on pxe boot with nbd

Christian Hesse

24 May 2016 24 May '16

3:35 p.m.

Hello everybody, with my latest builds I see a regression on pxe boot with nbd. About 50% of boots fail. The nbd module is loaded, nbd-client attaches the device, but mount fails: mount: you must specify the filesystem type ERROR; Failed to mount '/dev/nbd0' Falling back to interactive prompt You can try to fix the problem manually, log out when you are finished A simple mount allows to continue boot: mount /dev/nbd0 /run/archiso/bootmnt/ <Ctrl>-d My guess is that linux 4.6 introduced a race condition. Any idea how to fix or handle this? -- main(a){char*c=/* Schoene Gruesse */"B?IJj;MEH" "CX:;",b;for(a/* Best regards my address: */=0;b=c[a++];) putchar(b-1/(/* Chris cc -ox -xc - && ./x */b/42*2-3)*42);}

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Christian Hesse

24 May 24 May

3:54 p.m.

Christian Hesse on Tue, 2016/05/24 14:35:

...

Hello everybody,

with my latest builds I see a regression on pxe boot with nbd. About 50% of boots fail. The nbd module is loaded, nbd-client attaches the device, but mount fails:

mount: you must specify the filesystem type ERROR; Failed to mount '/dev/nbd0' Falling back to interactive prompt You can try to fix the problem manually, log out when you are finished

A simple mount allows to continue boot:

mount /dev/nbd0 /run/archiso/bootmnt/ <Ctrl>-d

My guess is that linux 4.6 introduced a race condition. Any idea how to fix or handle this?

Looks like adding a boot parameter nbd.nbds_max=2 fixes this (or makes it a lot less likely to happen). However this is still more of a workaround... -- main(a){char*c=/* Schoene Gruesse */"B?IJj;MEH" "CX:;",b;for(a/* Best regards my address: */=0;b=c[a++];) putchar(b-1/(/* Chris cc -ox -xc - && ./x */b/42*2-3)*42);}

Gerardo Exequiel Pozzi

25 May 25 May

3:27 a.m.

On 05/24/16 09:54, Christian Hesse wrote:

...

Christian Hesse on Tue, 2016/05/24 14:35:

...
Hello everybody,

with my latest builds I see a regression on pxe boot with nbd. About 50% of boots fail. The nbd module is loaded, nbd-client attaches the device, but mount fails:

mount: you must specify the filesystem type ERROR; Failed to mount '/dev/nbd0' Falling back to interactive prompt You can try to fix the problem manually, log out when you are finished

A simple mount allows to continue boot:

mount /dev/nbd0 /run/archiso/bootmnt/ <Ctrl>-d

My guess is that linux 4.6 introduced a race condition. Any idea how to fix or handle this?

Looks like adding a boot parameter

nbd.nbds_max=2

fixes this (or makes it a lot less likely to happen). However this is still more of a workaround...

Hi Christian Did you try booting with earlymodules=nbd if goes better? Thanks for doing a good job here.

Christian Hesse

11:35 a.m.

Gerardo Exequiel Pozzi on Tue, 2016/05/24 21:27:

...

On 05/24/16 09:54, Christian Hesse wrote:

...
Christian Hesse on Tue, 2016/05/24 14:35:

...
Hello everybody,

with my latest builds I see a regression on pxe boot with nbd. About 50% of boots fail. The nbd module is loaded, nbd-client attaches the device, but mount fails:

mount: you must specify the filesystem type ERROR; Failed to mount '/dev/nbd0' Falling back to interactive prompt You can try to fix the problem manually, log out when you are finished

A simple mount allows to continue boot:

mount /dev/nbd0 /run/archiso/bootmnt/ <Ctrl>-d

My guess is that linux 4.6 introduced a race condition. Any idea how to fix or handle this?

Looks like adding a boot parameter

nbd.nbds_max=2

fixes this (or makes it a lot less likely to happen). However this is still more of a workaround...

Hi Christian

Did you try booting with earlymodules=nbd if goes better?

Thanks for doing a good job here.

Yes, looks like earlymodules=nbd works as well. What's the best way to get this into the scripts? Or should we just move modprobe to run_earlyhook()? -- main(a){char*c=/* Schoene Gruesse */"B?IJj;MEH" "CX:;",b;for(a/* Best regards my address: */=0;b=c[a++];) putchar(b-1/(/* Chris cc -ox -xc - && ./x */b/42*2-3)*42);}

Christian Hesse

11:37 a.m.

New subject: [arch-releng] [PATCH 1/1] move modprobe to run_earlyhook()

From: Christian Hesse Signed-off-by: Christian Hesse --- archiso/initcpio/hooks/archiso_pxe_nbd | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/archiso/initcpio/hooks/archiso_pxe_nbd b/archiso/initcpio/hooks/archiso_pxe_nbd index fdb2c2b..b61cb1b 100644 --- a/archiso/initcpio/hooks/archiso_pxe_nbd +++ b/archiso/initcpio/hooks/archiso_pxe_nbd @@ -1,5 +1,10 @@ # vim: set ft=sh: +run_earlyhook() { + # Module autoloading like with loop devices does not work, doing manually... + modprobe nbd 2> /dev/null +} + run_hook() { if [[ -n "${ip}" && -n "${archiso_nbd_srv}" ]]; then @@ -13,9 +18,6 @@ run_hook() { archiso_pxe_nbd_mount_handler () { newroot="${1}" - # Module autoloading like with loop devices does not work, doing manually... - modprobe nbd 2> /dev/null - msg ":: Waiting for boot device..." while ! poll_device /dev/nbd0 30; do echo "ERROR: boot device didn't show up after 30 seconds..." -- 2.8.3

Christian Hesse

10:35 p.m.

New subject: [arch-releng] [PATCH v2 1/1] move modprobe to run_earlyhook()

From: Christian Hesse Signed-off-by: Christian Hesse --- archiso/initcpio/hooks/archiso_pxe_nbd | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/archiso/initcpio/hooks/archiso_pxe_nbd b/archiso/initcpio/hooks/archiso_pxe_nbd index fdb2c2b..532a7e1 100644 --- a/archiso/initcpio/hooks/archiso_pxe_nbd +++ b/archiso/initcpio/hooks/archiso_pxe_nbd @@ -1,5 +1,12 @@ # vim: set ft=sh: +run_earlyhook() { + if [[ -n "${ip}" && -n "${archiso_nbd_srv}" ]]; then + # Module autoloading like with loop devices does not work, doing manually... + modprobe nbd 2> /dev/null + fi +} + run_hook() { if [[ -n "${ip}" && -n "${archiso_nbd_srv}" ]]; then @@ -13,9 +20,6 @@ run_hook() { archiso_pxe_nbd_mount_handler () { newroot="${1}" - # Module autoloading like with loop devices does not work, doing manually... - modprobe nbd 2> /dev/null - msg ":: Waiting for boot device..." while ! poll_device /dev/nbd0 30; do echo "ERROR: boot device didn't show up after 30 seconds..." -- 2.8.3

Gerardo Exequiel Pozzi

26 May 26 May

2:30 p.m.

New subject: [arch-releng] [PATCH v2 1/1] move modprobe to run_earlyhook()

On 05/25/16 16:35, Christian Hesse wrote:

...

From: Christian Hesse

Signed-off-by: Christian Hesse --- archiso/initcpio/hooks/archiso_pxe_nbd | 10 +++++++---

Hola! I am thinking in release another archiso version with these changes before next ISO, do you have more patches pending? Thanks.

Christian Hesse

27 May 27 May

12:53 a.m.

New subject: [arch-releng] [PATCH 1/4] use ip syntax according to ip-address(8)

From: Christian Hesse According to ip-address(8) flushing an interface requires the keyword 'dev'. Also add proper quoting. Signed-off-by: Christian Hesse --- archiso/initcpio/hooks/archiso_pxe_common | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/archiso/initcpio/hooks/archiso_pxe_common b/archiso/initcpio/hooks/archiso_pxe_common index e97324f..66eecfa 100644 --- a/archiso/initcpio/hooks/archiso_pxe_common +++ b/archiso/initcpio/hooks/archiso_pxe_common @@ -51,8 +51,8 @@ run_latehook () { [[ -z "${copy_resolvconf}" ]] && copy_resolvconf="y" if [[ "${copytoram}" == "y" ]]; then - ip addr flush ${bootif_dev} - ip link set ${bootif_dev} down + ip addr flush dev "${bootif_dev}" + ip link set "${bootif_dev}" down elif [[ "${copy_resolvconf}" != "n" && -f /etc/resolv.conf ]]; then cp /etc/resolv.conf /new_root/etc/resolv.conf fi -- 2.8.3

Christian Hesse

12:53 a.m.

New subject: [arch-releng] [PATCH 2/4] be more flexible about finding the pxe boot interface

From: Christian Hesse Booting from iPXE we can set bootif_mac without having BOOTIF around. Signed-off-by: Christian Hesse --- archiso/initcpio/hooks/archiso_pxe_common | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/archiso/initcpio/hooks/archiso_pxe_common b/archiso/initcpio/hooks/archiso_pxe_common index 66eecfa..cedf585 100644 --- a/archiso/initcpio/hooks/archiso_pxe_common +++ b/archiso/initcpio/hooks/archiso_pxe_common @@ -10,9 +10,12 @@ run_hook () { # /tmp/net-*.conf if [[ -n "${ip}" ]]; then - if [[ -n "${BOOTIF}" ]]; then + if [[ -z "${bootif_mac}" && -n "${BOOTIF}" ]]; then bootif_mac=${BOOTIF#01-} bootif_mac=${bootif_mac//-/:} + fi + + if [[ -n "${bootif_mac}" ]]; then for i in /sys/class/net/*/address; do read net_mac < ${i} if [[ "${bootif_mac}" == "${net_mac}" ]]; then -- 2.8.3

Gerardo Exequiel Pozzi

3:09 a.m.

New subject: [arch-releng] [PATCH 2/4] be more flexible about finding the pxe boot interface

On 05/26/16 18:53, Christian Hesse wrote:

...

From: Christian Hesse

Booting from iPXE we can set bootif_mac without having BOOTIF around.

Signed-off-by: Christian Hesse --- archiso/initcpio/hooks/archiso_pxe_common | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/archiso/initcpio/hooks/archiso_pxe_common b/archiso/initcpio/hooks/archiso_pxe_common index 66eecfa..cedf585 100644 --- a/archiso/initcpio/hooks/archiso_pxe_common +++ b/archiso/initcpio/hooks/archiso_pxe_common @@ -10,9 +10,12 @@ run_hook () { # /tmp/net-*.conf

if [[ -n "${ip}" ]]; then - if [[ -n "${BOOTIF}" ]]; then + if [[ -z "${bootif_mac}" && -n "${BOOTIF}" ]]; then bootif_mac=${BOOTIF#01-} bootif_mac=${bootif_mac//-/:} + fi + + if [[ -n "${bootif_mac}" ]]; then for i in /sys/class/net/*/address; do read net_mac < ${i} if [[ "${bootif_mac}" == "${net_mac}" ]]; then

If bootit_mac becomes a new cmdline paramteter, please add to docs ;) Is not a bit redundant? User can set BOOTIF= at syslinux prompt. what is the advantage here?

Christian Hesse

9:44 a.m.

New subject: [arch-releng] [PATCH 2/4] be more flexible about finding the pxe boot interface

Gerardo Exequiel Pozzi on Thu, 2016/05/26 21:09:

...

On 05/26/16 18:53, Christian Hesse wrote:

...
From: Christian Hesse

Booting from iPXE we can set bootif_mac without having BOOTIF around.

Signed-off-by: Christian Hesse --- archiso/initcpio/hooks/archiso_pxe_common | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/archiso/initcpio/hooks/archiso_pxe_common b/archiso/initcpio/hooks/archiso_pxe_common index 66eecfa..cedf585 100644 --- a/archiso/initcpio/hooks/archiso_pxe_common +++ b/archiso/initcpio/hooks/archiso_pxe_common @@ -10,9 +10,12 @@ run_hook () { # /tmp/net-*.conf

if [[ -n "${ip}" ]]; then - if [[ -n "${BOOTIF}" ]]; then + if [[ -z "${bootif_mac}" && -n "${BOOTIF}" ]]; then bootif_mac=${BOOTIF#01-} bootif_mac=${bootif_mac//-/:} + fi + + if [[ -n "${bootif_mac}" ]]; then for i in /sys/class/net/*/address; do read net_mac < ${i} if [[ "${bootif_mac}" == "${net_mac}" ]]; then

If bootit_mac becomes a new cmdline paramteter, please add to docs ;)

Is not a bit redundant? User can set BOOTIF= at syslinux prompt. what is the advantage here?

Thinking about this... Just drop the patch. It does not matter what format I give to BOOTIF. So I can use the pxelinux version with hardware type prefix and mac address including dashes: BOOTIF=01-88-99-aa-bb-cc-dd Or give the mac address directly: BOOTIF=88:99:aa:bb:cc:dd Right? So I will adjust my boot parameters to always use BOOTIF=. -- main(a){char*c=/* Schoene Gruesse */"B?IJj;MEH" "CX:;",b;for(a/* Best regards my address: */=0;b=c[a++];) putchar(b-1/(/* Chris cc -ox -xc - && ./x */b/42*2-3)*42);}

Gerardo Exequiel Pozzi

7:46 p.m.

New subject: [arch-releng] [PATCH 2/4] be more flexible about finding the pxe boot interface

On 05/27/16 03:44, Christian Hesse wrote:

...

Gerardo Exequiel Pozzi on Thu, 2016/05/26 21:09:

...
On 05/26/16 18:53, Christian Hesse wrote:

...
From: Christian Hesse

Booting from iPXE we can set bootif_mac without having BOOTIF around.

Signed-off-by: Christian Hesse --- archiso/initcpio/hooks/archiso_pxe_common | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/archiso/initcpio/hooks/archiso_pxe_common b/archiso/initcpio/hooks/archiso_pxe_common index 66eecfa..cedf585 100644 --- a/archiso/initcpio/hooks/archiso_pxe_common +++ b/archiso/initcpio/hooks/archiso_pxe_common @@ -10,9 +10,12 @@ run_hook () { # /tmp/net-*.conf

if [[ -n "${ip}" ]]; then - if [[ -n "${BOOTIF}" ]]; then + if [[ -z "${bootif_mac}" && -n "${BOOTIF}" ]]; then bootif_mac=${BOOTIF#01-} bootif_mac=${bootif_mac//-/:} + fi + + if [[ -n "${bootif_mac}" ]]; then for i in /sys/class/net/*/address; do read net_mac < ${i} if [[ "${bootif_mac}" == "${net_mac}" ]]; then

If bootit_mac becomes a new cmdline paramteter, please add to docs ;)

Is not a bit redundant? User can set BOOTIF= at syslinux prompt. what is the advantage here?

Thinking about this... Just drop the patch. It does not matter what format I give to BOOTIF. So I can use the pxelinux version with hardware type prefix and mac address including dashes:

BOOTIF=01-88-99-aa-bb-cc-dd

Or give the mac address directly:

BOOTIF=88:99:aa:bb:cc:dd

Right? So I will adjust my boot parameters to always use BOOTIF=.

Yes, both forms are valid :) The only warning here is when using dash-form, always append 01- first if your MAC start with 01, otherwise will be considered as hardware type [HTYPE] (01 for Ethernet) This is also valid, but not recommended. BOOTIF=88-99-aa-bb-cc-dd

Christian Hesse

12:53 a.m.

New subject: [arch-releng] [PATCH 3/4] fall back to ipconfig output for boot interface

From: Christian Hesse Signed-off-by: Christian Hesse --- archiso/initcpio/hooks/archiso_pxe_common | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/archiso/initcpio/hooks/archiso_pxe_common b/archiso/initcpio/hooks/archiso_pxe_common index cedf585..adadefc 100644 --- a/archiso/initcpio/hooks/archiso_pxe_common +++ b/archiso/initcpio/hooks/archiso_pxe_common @@ -39,6 +39,12 @@ run_hook () { pxeserver=${ROOTSERVER} + # If neither BOOTIF nor bootif_mac have been set from bootloader we do + # not know the boot interface, yet. Get it from ipconfig output now. + if [[ -z "${bootif_dev}" ]]; then + bootif_dev="${DEVICE}" + fi + # setup DNS resolver if [[ "${IPV4DNS0}" != "0.0.0.0" ]]; then echo "nameserver ${IPV4DNS0}" > /etc/resolv.conf -- 2.8.3

Gerardo Exequiel Pozzi

7:53 p.m.

New subject: [arch-releng] [PATCH 3/4] fall back to ipconfig output for boot interface

On 05/26/16 18:53, Christian Hesse wrote:

...

From: Christian Hesse

Signed-off-by: Christian Hesse --- archiso/initcpio/hooks/archiso_pxe_common | 6 ++++++ 1 file changed, 6 insertions(+)

diff --git a/archiso/initcpio/hooks/archiso_pxe_common b/archiso/initcpio/hooks/archiso_pxe_common index cedf585..adadefc 100644 --- a/archiso/initcpio/hooks/archiso_pxe_common +++ b/archiso/initcpio/hooks/archiso_pxe_common @@ -39,6 +39,12 @@ run_hook () {

pxeserver=${ROOTSERVER}

+ # If neither BOOTIF nor bootif_mac have been set from bootloader we do + # not know the boot interface, yet. Get it from ipconfig output now. + if [[ -z "${bootif_dev}" ]]; then + bootif_dev="${DEVICE}" + fi + # setup DNS resolver if [[ "${IPV4DNS0}" != "0.0.0.0" ]]; then echo "nameserver ${IPV4DNS0}" > /etc/resolv.conf

I guess this is not needed (not that you know about BOOTIF=), right?

Christian Hesse

8:57 p.m.

New subject: [arch-releng] [PATCH 3/4] fall back to ipconfig output for boot interface

Gerardo Exequiel Pozzi on Fri, 2016/05/27 13:53:

...

On 05/26/16 18:53, Christian Hesse wrote:

...
From: Christian Hesse

Signed-off-by: Christian Hesse --- archiso/initcpio/hooks/archiso_pxe_common | 6 ++++++ 1 file changed, 6 insertions(+)

diff --git a/archiso/initcpio/hooks/archiso_pxe_common b/archiso/initcpio/hooks/archiso_pxe_common index cedf585..adadefc 100644 --- a/archiso/initcpio/hooks/archiso_pxe_common +++ b/archiso/initcpio/hooks/archiso_pxe_common @@ -39,6 +39,12 @@ run_hook () {

pxeserver=${ROOTSERVER}

+ # If neither BOOTIF nor bootif_mac have been set from bootloader we do + # not know the boot interface, yet. Get it from ipconfig output now. + if [[ -z "${bootif_dev}" ]]; then + bootif_dev="${DEVICE}" + fi + # setup DNS resolver if [[ "${IPV4DNS0}" != "0.0.0.0" ]]; then echo "nameserver ${IPV4DNS0}" > /etc/resolv.conf

I guess this is not needed (not that you know about BOOTIF=), right?

My setup works without now and users of pxelinux and iPXE are fine. Are there any other pxe boot loaders that do not support giving mac address via boot parameter? -- main(a){char*c=/* Schoene Gruesse */"B?IJj;MEH" "CX:;",b;for(a/* Best regards my address: */=0;b=c[a++];) putchar(b-1/(/* Chris cc -ox -xc - && ./x */b/42*2-3)*42);}

Christian Hesse

12:53 a.m.

New subject: [arch-releng] [PATCH 4/4] do not declare bootif_dev local

From: Christian Hesse Signed-off-by: Christian Hesse --- archiso/initcpio/hooks/archiso_pxe_common | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/archiso/initcpio/hooks/archiso_pxe_common b/archiso/initcpio/hooks/archiso_pxe_common index adadefc..1a9fe9d 100644 --- a/archiso/initcpio/hooks/archiso_pxe_common +++ b/archiso/initcpio/hooks/archiso_pxe_common @@ -1,7 +1,8 @@ # vim: set ft=sh: run_hook () { - local i net_mac bootif_mac bootif_dev + # Do *not* declare 'bootif_dev' local! We need it in run_latehook(). + local i net_mac bootif_mac # These variables will be parsed from /tmp/net-*.conf generated by ipconfig local DEVICE local IPV4ADDR IPV4BROADCAST IPV4NETMASK IPV4GATEWAY IPV4DNS0 IPV4DNS1 -- 2.8.3

Christian Hesse

9:01 p.m.

New subject: [arch-releng] [PATCH 4/4] do not declare bootif_dev local

Christian Hesse on Thu, 2016/05/26 23:53:

...

From: Christian Hesse

Signed-off-by: Christian Hesse --- archiso/initcpio/hooks/archiso_pxe_common | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/archiso/initcpio/hooks/archiso_pxe_common b/archiso/initcpio/hooks/archiso_pxe_common index adadefc..1a9fe9d 100644 --- a/archiso/initcpio/hooks/archiso_pxe_common +++ b/archiso/initcpio/hooks/archiso_pxe_common @@ -1,7 +1,8 @@ # vim: set ft=sh:

run_hook () { - local i net_mac bootif_mac bootif_dev + # Do *not* declare 'bootif_dev' local! We need it in run_latehook(). + local i net_mac bootif_mac # These variables will be parsed from /tmp/net-*.conf generated by ipconfig local DEVICE local IPV4ADDR IPV4BROADCAST IPV4NETMASK IPV4GATEWAY IPV4DNS0 IPV4DNS1

This one is most important. :D Did you miss it? -- main(a){char*c=/* Schoene Gruesse */"B?IJj;MEH" "CX:;",b;for(a/* Best regards my address: */=0;b=c[a++];) putchar(b-1/(/* Chris cc -ox -xc - && ./x */b/42*2-3)*42);}

Gerardo Exequiel Pozzi

28 May 28 May

12:57 a.m.

New subject: [arch-releng] [PATCH 4/4] do not declare bootif_dev local

On 05/27/16 15:01, Christian Hesse wrote:

...

Christian Hesse on Thu, 2016/05/26 23:53:

...
From: Christian Hesse

Signed-off-by: Christian Hesse --- archiso/initcpio/hooks/archiso_pxe_common | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/archiso/initcpio/hooks/archiso_pxe_common b/archiso/initcpio/hooks/archiso_pxe_common index adadefc..1a9fe9d 100644 --- a/archiso/initcpio/hooks/archiso_pxe_common +++ b/archiso/initcpio/hooks/archiso_pxe_common @@ -1,7 +1,8 @@ # vim: set ft=sh:

run_hook () { - local i net_mac bootif_mac bootif_dev + # Do *not* declare 'bootif_dev' local! We need it in run_latehook(). + local i net_mac bootif_mac # These variables will be parsed from /tmp/net-*.conf generated by ipconfig local DEVICE local IPV4ADDR IPV4BROADCAST IPV4NETMASK IPV4GATEWAY IPV4DNS0 IPV4DNS1

This one is most important. :D Did you miss it?

woops, confused with bootif_mac! pushing... ¡Gracias!

Christian Hesse

27 May 27 May

1:02 a.m.

New subject: [arch-releng] [PATCH v2 1/1] move modprobe to run_earlyhook()

Gerardo Exequiel Pozzi on Thu, 2016/05/26 08:30:

...

On 05/25/16 16:35, Christian Hesse wrote:

...
From: Christian Hesse

Signed-off-by: Christian Hesse --- archiso/initcpio/hooks/archiso_pxe_nbd | 10 +++++++---

Hola!

I am thinking in release another archiso version with these changes before next ISO, do you have more patches pending?

Bringing down a network interface in copy-to-ram mode has been broken since... ever. (And flushing broke with e018653a.) I investigated and prepared four more patches. That's it for now I think. -- main(a){char*c=/* Schoene Gruesse */"B?IJj;MEH" "CX:;",b;for(a/* Best regards my address: */=0;b=c[a++];) putchar(b-1/(/* Chris cc -ox -xc - && ./x */b/42*2-3)*42);}

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Christian Hesse
Gerardo Exequiel Pozzi

[arch-releng] regression with race condition on pxe boot with nbd

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