Public bug reported:

Tests are blocking and failing eventually with a timeout.
Hits all architectures and is reproducible.

Locally reproducible in autopkgtest:

sudo ~/work/autopkgtest/autopkgtest/runner/autopkgtest --no-built-
binaries --apt-upgrade --apt-pocket=proposed=src:libpcap2 --shell-fail
chrony_3.5-5ubuntu1.dsc -- qemu --qemu-options='-cpu host' --ram-
size=2048 --cpus 2 ~/work/autopkgtest-focal-amd64.img


Seems to be a block on network on __skb_wait_for_more_packets

$cat /proc/3833/wchan
__skb_wait_for_more_packets

>From strace POV that is a wait in accept that does not unblock:

$ sudo strace -rT -p 3833
strace: Process 3833 attached
     0.000000 accept(6, NULL, NULL
<hangs>

The logs are no help:
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stderr => empty
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stdout => matches the 
console

$ cat /tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stdout
make: Entering directory '/tmp/autopkgtest.epy1pq/autopkgtest_tmp'
cc -O2 -Wall -g -fPIC   -c -o client.o client.c
cc -O2 -Wall -g -fPIC -shared -o clknetsim.so client.o  -ldl -lm
g++ -O2 -Wall -g -fPIC   -c -o clock.o clock.cc
g++ -O2 -Wall -g -fPIC   -c -o node.o node.cc
g++ -O2 -Wall -g -fPIC   -c -o generator.o generator.cc
g++ -O2 -Wall -g -fPIC   -c -o network.o network.cc
g++ -O2 -Wall -g -fPIC   -c -o server.o server.cc
g++ -O2 -Wall -g -fPIC   -c -o stats.o stats.cc
g++ -O2 -Wall -g -fPIC -o clknetsim clock.o node.o generator.o network.o 
server.o stats.o
make: Leaving directory '/tmp/autopkgtest.epy1pq/autopkgtest_tmp'
001-defaults
<hang>

Noisy PS output:

4     0     506       1  20   0   2600  1920 -      Ss   ttyS1      0:00 /bin/sh
1     0    3690     506  20   0   2600   128 -      S+   ttyS1      0:00  \_ 
/bin/sh
4     0    3691    3690  20   0   8172  3660 -      S+   ttyS1      0:00      
\_ su -s /bin/bash ubuntu -c set -e; export USER=`id -nu`; . /etc/profile 
>/dev/null 2>&1 || true;  . ~/.profile
 >/dev/null 2>&1 || true; buildtree="/tmp/autopkgtest.epy1pq/build.KhE/src"; 
mkdir -p -m 1777 -- 
"/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-artifacts"; export 
AUTOPKGTEST_ARTIFA
CTS="/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-artifacts"; export 
ADT_ARTIFACTS="$AUTOPKGTEST_ARTIFACTS"; mkdir -p -m 755 
"/tmp/autopkgtest.epy1pq/autopkgtest_tmp"; export AUTOP
KGTEST_TMP="/tmp/autopkgtest.epy1pq/autopkgtest_tmp"; export 
ADTTMP="$AUTOPKGTEST_TMP"; export DEBIAN_FRONTEND=noninteractive; export 
LANG=C.UTF-8; export DEB_BUILD_OPTIONS=parallel=2; unset
 LANGUAGE LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE   LC_MONETARY LC_MESSAGES 
LC_PAPER LC_NAME LC_ADDRESS   LC_TELEPHONE LC_MEASUREMENT LC_IDENTIFICATION 
LC_ALL;rm -f /tmp/autopkgtest_script_pi
d; set -C; echo $$ > /tmp/autopkgtest_script_pid; set +C; trap "rm -f 
/tmp/autopkgtest_script_pid" EXIT INT QUIT PIPE; cd "$buildtree"; chmod +x 
/tmp/autopkgtest.epy1pq/build.KhE/src/debian/
tests/upstream-simulation-test-suite; touch 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stdout 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stderr; 
/tmp/autopkgtest.epy1
pq/build.KhE/src/debian/tests/upstream-simulation-test-suite 2> >(tee -a 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stderr >&2) > >(tee -a 
/tmp/autopkgtest.epy1pq/upstream-simula
tion-test-suite-stdout);
4  1000    3720    3691  20   0   8608  3852 do_wai Ss   ?          0:00        
  \_ bash -c set -e; export USER=`id -nu`; . /etc/profile >/dev/null 2>&1 || 
true;  . ~/.profile >/dev/null 2>
&1 || true; buildtree="/tmp/autopkgtest.epy1pq/build.KhE/src"; mkdir -p -m 1777 
-- "/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-artifacts"; export 
AUTOPKGTEST_ARTIFACTS="/tmp/auto
pkgtest.epy1pq/upstream-simulation-test-suite-artifacts"; export 
ADT_ARTIFACTS="$AUTOPKGTEST_ARTIFACTS"; mkdir -p -m 755 
"/tmp/autopkgtest.epy1pq/autopkgtest_tmp"; export AUTOPKGTEST_TMP="/t
mp/autopkgtest.epy1pq/autopkgtest_tmp"; export ADTTMP="$AUTOPKGTEST_TMP"; 
export DEBIAN_FRONTEND=noninteractive; export LANG=C.UTF-8; export 
DEB_BUILD_OPTIONS=parallel=2; unset LANGUAGE LC_C
TYPE LC_NUMERIC LC_TIME LC_COLLATE   LC_MONETARY LC_MESSAGES LC_PAPER LC_NAME 
LC_ADDRESS   LC_TELEPHONE LC_MEASUREMENT LC_IDENTIFICATION LC_ALL;rm -f 
/tmp/autopkgtest_script_pid; set -C; ech
o $$ > /tmp/autopkgtest_script_pid; set +C; trap "rm -f 
/tmp/autopkgtest_script_pid" EXIT INT QUIT PIPE; cd "$buildtree"; chmod +x 
/tmp/autopkgtest.epy1pq/build.KhE/src/debian/tests/upstream
-simulation-test-suite; touch 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stdout 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stderr; 
/tmp/autopkgtest.epy1pq/build.KhE/s
rc/debian/tests/upstream-simulation-test-suite 2> >(tee -a 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stderr >&2) > >(tee -a 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suit
e-stdout);
0  1000    3728    3720  20   0   2600   732 do_wai S    ?          0:00        
      \_ /bin/sh 
/tmp/autopkgtest.epy1pq/build.KhE/src/debian/tests/upstream-simulation-test-suite
1  1000    3729    3728  20   0   8608  1896 do_wai S    ?          0:00        
          \_ bash -c set -e; export USER=`id -nu`; . /etc/profile >/dev/null 
2>&1 || true;  . ~/.profile >/dev
/null 2>&1 || true; buildtree="/tmp/autopkgtest.epy1pq/build.KhE/src"; mkdir -p 
-m 1777 -- "/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-artifacts"; 
export AUTOPKGTEST_ARTIFACTS="/
tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-artifacts"; export 
ADT_ARTIFACTS="$AUTOPKGTEST_ARTIFACTS"; mkdir -p -m 755 
"/tmp/autopkgtest.epy1pq/autopkgtest_tmp"; export AUTOPKGTEST
_TMP="/tmp/autopkgtest.epy1pq/autopkgtest_tmp"; export 
ADTTMP="$AUTOPKGTEST_TMP"; export DEBIAN_FRONTEND=noninteractive; export 
LANG=C.UTF-8; export DEB_BUILD_OPTIONS=parallel=2; unset LANGU
AGE LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE   LC_MONETARY LC_MESSAGES LC_PAPER 
LC_NAME LC_ADDRESS   LC_TELEPHONE LC_MEASUREMENT LC_IDENTIFICATION LC_ALL;rm -f 
/tmp/autopkgtest_script_pid; set
 -C; echo $$ > /tmp/autopkgtest_script_pid; set +C; trap "rm -f 
/tmp/autopkgtest_script_pid" EXIT INT QUIT PIPE; cd "$buildtree"; chmod +x 
/tmp/autopkgtest.epy1pq/build.KhE/src/debian/tests/
upstream-simulation-test-suite; touch 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stdout 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stderr; 
/tmp/autopkgtest.epy1pq/bui
ld.KhE/src/debian/tests/upstream-simulation-test-suite 2> >(tee -a 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stderr >&2) > >(tee -a 
/tmp/autopkgtest.epy1pq/upstream-simulation-t
est-suite-stdout);
0  1000    3730    3729  20   0   7228   848 pipe_w S    ?          0:00        
          |   \_ tee -a 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stderr
1  1000    3731    3728  20   0   8608  1756 do_wai S    ?          0:00        
          \_ bash -c set -e; export USER=`id -nu`; . /etc/profile >/dev/null 
2>&1 || true;  . ~/.profile >/dev
/null 2>&1 || true; buildtree="/tmp/autopkgtest.epy1pq/build.KhE/src"; mkdir -p 
-m 1777 -- "/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-artifacts"; 
export AUTOPKGTEST_ARTIFACTS="/
tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-artifacts"; export 
ADT_ARTIFACTS="$AUTOPKGTEST_ARTIFACTS"; mkdir -p -m 755 
"/tmp/autopkgtest.epy1pq/autopkgtest_tmp"; export AUTOPKGTEST
_TMP="/tmp/autopkgtest.epy1pq/autopkgtest_tmp"; export 
ADTTMP="$AUTOPKGTEST_TMP"; export DEBIAN_FRONTEND=noninteractive; export 
LANG=C.UTF-8; export DEB_BUILD_OPTIONS=parallel=2; unset LANGU
AGE LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE   LC_MONETARY LC_MESSAGES LC_PAPER 
LC_NAME LC_ADDRESS   LC_TELEPHONE LC_MEASUREMENT LC_IDENTIFICATION LC_ALL;rm -f 
/tmp/autopkgtest_script_pid; set
 -C; echo $$ > /tmp/autopkgtest_script_pid; set +C; trap "rm -f 
/tmp/autopkgtest_script_pid" EXIT INT QUIT PIPE; cd "$buildtree"; chmod +x 
/tmp/autopkgtest.epy1pq/build.KhE/src/debian/tests/
upstream-simulation-test-suite; touch 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stdout 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stderr; 
/tmp/autopkgtest.epy1pq/bui
ld.KhE/src/debian/tests/upstream-simulation-test-suite 2> >(tee -a 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stderr >&2) > >(tee -a 
/tmp/autopkgtest.epy1pq/upstream-simulation-t
est-suite-stdout);
0  1000    3732    3731  20   0   7228   780 pipe_w S    ?          0:00        
          |   \_ tee -a 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stdout
0  1000    3794    3728  20   0   8608  3300 do_wai S    ?          0:00        
          \_ /bin/bash ./run -i 20 -m 2
0  1000    3798    3794  20   0   9136  3992 do_wai S    ?          0:00        
              \_ /bin/bash ./001-defaults
0  1000    3833    3798  20   0   5928  1864 skb_wa S    ?          0:00        
                  \_ /tmp/autopkgtest.epy1pq/autopkgtest_tmp/clknetsim -o 
tmp/log.offset -f tmp/log.freq -p tmp/log.packets -R 1 -r 210 -l 10000 -s 
tmp/sock tmp/conf 2

** Affects: chrony (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: update-excuse

** Tags added: update-excuse

** Description changed:

+ Tests are blocking and failing eventually with a timeout.
+ Hits all architectures and is reproducible.
+ 
+ Locally reproducible in autopkgtest:
+ 
+ sudo ~/work/autopkgtest/autopkgtest/runner/autopkgtest --no-built-
+ binaries --apt-upgrade --apt-pocket=proposed=src:libpcap2 --shell-fail
+ chrony_3.5-5ubuntu1.dsc -- qemu --qemu-options='-cpu host' --ram-
+ size=2048 --cpus 2 ~/work/autopkgtest-focal-amd64.img
+ 
+ 
  Seems to be a block on network on __skb_wait_for_more_packets
  
- $cat /proc/3833/wchan 
+ $cat /proc/3833/wchan
  __skb_wait_for_more_packets
  
  From strace POV that is a wait in accept that does not unblock:
  
  $ sudo strace -rT -p 3833
  strace: Process 3833 attached
-      0.000000 accept(6, NULL, NULL
+      0.000000 accept(6, NULL, NULL
  <hangs>
- 
  
  The logs are no help:
  /tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stderr => empty
  /tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stdout => matches the 
console
  
- $ cat /tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stdout 
+ $ cat /tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stdout
  make: Entering directory '/tmp/autopkgtest.epy1pq/autopkgtest_tmp'
  cc -O2 -Wall -g -fPIC   -c -o client.o client.c
  cc -O2 -Wall -g -fPIC -shared -o clknetsim.so client.o  -ldl -lm
  g++ -O2 -Wall -g -fPIC   -c -o clock.o clock.cc
  g++ -O2 -Wall -g -fPIC   -c -o node.o node.cc
  g++ -O2 -Wall -g -fPIC   -c -o generator.o generator.cc
  g++ -O2 -Wall -g -fPIC   -c -o network.o network.cc
  g++ -O2 -Wall -g -fPIC   -c -o server.o server.cc
  g++ -O2 -Wall -g -fPIC   -c -o stats.o stats.cc
- g++ -O2 -Wall -g -fPIC -o clknetsim clock.o node.o generator.o network.o 
server.o stats.o 
+ g++ -O2 -Wall -g -fPIC -o clknetsim clock.o node.o generator.o network.o 
server.o stats.o
  make: Leaving directory '/tmp/autopkgtest.epy1pq/autopkgtest_tmp'
  001-defaults
  <hang>
- 
  
  Noisy PS output:
  
  4     0     506       1  20   0   2600  1920 -      Ss   ttyS1      0:00 
/bin/sh
  1     0    3690     506  20   0   2600   128 -      S+   ttyS1      0:00  \_ 
/bin/sh
  4     0    3691    3690  20   0   8172  3660 -      S+   ttyS1      0:00      
\_ su -s /bin/bash ubuntu -c set -e; export USER=`id -nu`; . /etc/profile 
>/dev/null 2>&1 || true;  . ~/.profile
-  >/dev/null 2>&1 || true; buildtree="/tmp/autopkgtest.epy1pq/build.KhE/src"; 
mkdir -p -m 1777 -- 
"/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-artifacts"; export 
AUTOPKGTEST_ARTIFA
+  >/dev/null 2>&1 || true; buildtree="/tmp/autopkgtest.epy1pq/build.KhE/src"; 
mkdir -p -m 1777 -- 
"/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-artifacts"; export 
AUTOPKGTEST_ARTIFA
  CTS="/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-artifacts"; 
export ADT_ARTIFACTS="$AUTOPKGTEST_ARTIFACTS"; mkdir -p -m 755 
"/tmp/autopkgtest.epy1pq/autopkgtest_tmp"; export AUTOP
  KGTEST_TMP="/tmp/autopkgtest.epy1pq/autopkgtest_tmp"; export 
ADTTMP="$AUTOPKGTEST_TMP"; export DEBIAN_FRONTEND=noninteractive; export 
LANG=C.UTF-8; export DEB_BUILD_OPTIONS=parallel=2; unset
-  LANGUAGE LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE   LC_MONETARY LC_MESSAGES 
LC_PAPER LC_NAME LC_ADDRESS   LC_TELEPHONE LC_MEASUREMENT LC_IDENTIFICATION 
LC_ALL;rm -f /tmp/autopkgtest_script_pi
+  LANGUAGE LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE   LC_MONETARY LC_MESSAGES 
LC_PAPER LC_NAME LC_ADDRESS   LC_TELEPHONE LC_MEASUREMENT LC_IDENTIFICATION 
LC_ALL;rm -f /tmp/autopkgtest_script_pi
  d; set -C; echo $$ > /tmp/autopkgtest_script_pid; set +C; trap "rm -f 
/tmp/autopkgtest_script_pid" EXIT INT QUIT PIPE; cd "$buildtree"; chmod +x 
/tmp/autopkgtest.epy1pq/build.KhE/src/debian/
  tests/upstream-simulation-test-suite; touch 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stdout 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stderr; 
/tmp/autopkgtest.epy1
  pq/build.KhE/src/debian/tests/upstream-simulation-test-suite 2> >(tee -a 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stderr >&2) > >(tee -a 
/tmp/autopkgtest.epy1pq/upstream-simula
  tion-test-suite-stdout);
  4  1000    3720    3691  20   0   8608  3852 do_wai Ss   ?          0:00      
    \_ bash -c set -e; export USER=`id -nu`; . /etc/profile >/dev/null 2>&1 || 
true;  . ~/.profile >/dev/null 2>
  &1 || true; buildtree="/tmp/autopkgtest.epy1pq/build.KhE/src"; mkdir -p -m 
1777 -- "/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-artifacts"; 
export AUTOPKGTEST_ARTIFACTS="/tmp/auto
  pkgtest.epy1pq/upstream-simulation-test-suite-artifacts"; export 
ADT_ARTIFACTS="$AUTOPKGTEST_ARTIFACTS"; mkdir -p -m 755 
"/tmp/autopkgtest.epy1pq/autopkgtest_tmp"; export AUTOPKGTEST_TMP="/t
  mp/autopkgtest.epy1pq/autopkgtest_tmp"; export ADTTMP="$AUTOPKGTEST_TMP"; 
export DEBIAN_FRONTEND=noninteractive; export LANG=C.UTF-8; export 
DEB_BUILD_OPTIONS=parallel=2; unset LANGUAGE LC_C
  TYPE LC_NUMERIC LC_TIME LC_COLLATE   LC_MONETARY LC_MESSAGES LC_PAPER LC_NAME 
LC_ADDRESS   LC_TELEPHONE LC_MEASUREMENT LC_IDENTIFICATION LC_ALL;rm -f 
/tmp/autopkgtest_script_pid; set -C; ech
  o $$ > /tmp/autopkgtest_script_pid; set +C; trap "rm -f 
/tmp/autopkgtest_script_pid" EXIT INT QUIT PIPE; cd "$buildtree"; chmod +x 
/tmp/autopkgtest.epy1pq/build.KhE/src/debian/tests/upstream
  -simulation-test-suite; touch 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stdout 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stderr; 
/tmp/autopkgtest.epy1pq/build.KhE/s
  rc/debian/tests/upstream-simulation-test-suite 2> >(tee -a 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stderr >&2) > >(tee -a 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suit
  e-stdout);
  0  1000    3728    3720  20   0   2600   732 do_wai S    ?          0:00      
        \_ /bin/sh 
/tmp/autopkgtest.epy1pq/build.KhE/src/debian/tests/upstream-simulation-test-suite
  1  1000    3729    3728  20   0   8608  1896 do_wai S    ?          0:00      
            \_ bash -c set -e; export USER=`id -nu`; . /etc/profile >/dev/null 
2>&1 || true;  . ~/.profile >/dev
  /null 2>&1 || true; buildtree="/tmp/autopkgtest.epy1pq/build.KhE/src"; mkdir 
-p -m 1777 -- 
"/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-artifacts"; export 
AUTOPKGTEST_ARTIFACTS="/
  tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-artifacts"; export 
ADT_ARTIFACTS="$AUTOPKGTEST_ARTIFACTS"; mkdir -p -m 755 
"/tmp/autopkgtest.epy1pq/autopkgtest_tmp"; export AUTOPKGTEST
  _TMP="/tmp/autopkgtest.epy1pq/autopkgtest_tmp"; export 
ADTTMP="$AUTOPKGTEST_TMP"; export DEBIAN_FRONTEND=noninteractive; export 
LANG=C.UTF-8; export DEB_BUILD_OPTIONS=parallel=2; unset LANGU
  AGE LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE   LC_MONETARY LC_MESSAGES LC_PAPER 
LC_NAME LC_ADDRESS   LC_TELEPHONE LC_MEASUREMENT LC_IDENTIFICATION LC_ALL;rm -f 
/tmp/autopkgtest_script_pid; set
-  -C; echo $$ > /tmp/autopkgtest_script_pid; set +C; trap "rm -f 
/tmp/autopkgtest_script_pid" EXIT INT QUIT PIPE; cd "$buildtree"; chmod +x 
/tmp/autopkgtest.epy1pq/build.KhE/src/debian/tests/
+  -C; echo $$ > /tmp/autopkgtest_script_pid; set +C; trap "rm -f 
/tmp/autopkgtest_script_pid" EXIT INT QUIT PIPE; cd "$buildtree"; chmod +x 
/tmp/autopkgtest.epy1pq/build.KhE/src/debian/tests/
  upstream-simulation-test-suite; touch 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stdout 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stderr; 
/tmp/autopkgtest.epy1pq/bui
  ld.KhE/src/debian/tests/upstream-simulation-test-suite 2> >(tee -a 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stderr >&2) > >(tee -a 
/tmp/autopkgtest.epy1pq/upstream-simulation-t
  est-suite-stdout);
  0  1000    3730    3729  20   0   7228   848 pipe_w S    ?          0:00      
            |   \_ tee -a 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stderr
  1  1000    3731    3728  20   0   8608  1756 do_wai S    ?          0:00      
            \_ bash -c set -e; export USER=`id -nu`; . /etc/profile >/dev/null 
2>&1 || true;  . ~/.profile >/dev
  /null 2>&1 || true; buildtree="/tmp/autopkgtest.epy1pq/build.KhE/src"; mkdir 
-p -m 1777 -- 
"/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-artifacts"; export 
AUTOPKGTEST_ARTIFACTS="/
  tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-artifacts"; export 
ADT_ARTIFACTS="$AUTOPKGTEST_ARTIFACTS"; mkdir -p -m 755 
"/tmp/autopkgtest.epy1pq/autopkgtest_tmp"; export AUTOPKGTEST
  _TMP="/tmp/autopkgtest.epy1pq/autopkgtest_tmp"; export 
ADTTMP="$AUTOPKGTEST_TMP"; export DEBIAN_FRONTEND=noninteractive; export 
LANG=C.UTF-8; export DEB_BUILD_OPTIONS=parallel=2; unset LANGU
  AGE LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE   LC_MONETARY LC_MESSAGES LC_PAPER 
LC_NAME LC_ADDRESS   LC_TELEPHONE LC_MEASUREMENT LC_IDENTIFICATION LC_ALL;rm -f 
/tmp/autopkgtest_script_pid; set
-  -C; echo $$ > /tmp/autopkgtest_script_pid; set +C; trap "rm -f 
/tmp/autopkgtest_script_pid" EXIT INT QUIT PIPE; cd "$buildtree"; chmod +x 
/tmp/autopkgtest.epy1pq/build.KhE/src/debian/tests/
+  -C; echo $$ > /tmp/autopkgtest_script_pid; set +C; trap "rm -f 
/tmp/autopkgtest_script_pid" EXIT INT QUIT PIPE; cd "$buildtree"; chmod +x 
/tmp/autopkgtest.epy1pq/build.KhE/src/debian/tests/
  upstream-simulation-test-suite; touch 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stdout 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stderr; 
/tmp/autopkgtest.epy1pq/bui
  ld.KhE/src/debian/tests/upstream-simulation-test-suite 2> >(tee -a 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stderr >&2) > >(tee -a 
/tmp/autopkgtest.epy1pq/upstream-simulation-t
  est-suite-stdout);
  0  1000    3732    3731  20   0   7228   780 pipe_w S    ?          0:00      
            |   \_ tee -a 
/tmp/autopkgtest.epy1pq/upstream-simulation-test-suite-stdout
  0  1000    3794    3728  20   0   8608  3300 do_wai S    ?          0:00      
            \_ /bin/bash ./run -i 20 -m 2
  0  1000    3798    3794  20   0   9136  3992 do_wai S    ?          0:00      
                \_ /bin/bash ./001-defaults
  0  1000    3833    3798  20   0   5928  1864 skb_wa S    ?          0:00      
                    \_ /tmp/autopkgtest.epy1pq/autopkgtest_tmp/clknetsim -o 
tmp/log.offset -f tmp/log.freq -p tmp/log.packets -R 1 -r 210 -l 10000 -s 
tmp/sock tmp/conf 2

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https://bugs.launchpad.net/bugs/1863590

Title:
  Chrony test hangs with libpcap2 1:2.31-1

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