Comment 0 for bug 2000667

Issue found with 5.19.0-1010.11, 5.19.0-1011.12

This issue does not exist in 5.19.0-1009.10 because the net test can't be built by that time.

Test output:
 Running 'make run_tests -C net TEST_PROGS=cmsg_so_mark.sh TEST_GEN_PROGS='' TEST_CUSTOM_PROGS='''
  make: Entering directory '/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/net'
  make --no-builtin-rules ARCH=riscv -C ../../../.. headers_install
  make[1]: Entering directory '/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux'
    INSTALL ./usr/include
  make[1]: Leaving directory '/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux'
  TAP version 13
  1..1
  # selftests: net: cmsg_so_mark.sh
 Timer expired (5400 sec.), nuking pid 82951

A manual test shows it will stuck with:
$ sudo ./cmsg_so_mark.sh
+ NS=ns
+ IP4=172.16.0.1/24
+ TGT4=172.16.0.2
+ IP6=2001:db8:1::1/64
+ TGT6=2001:db8:1::2
+ MARK=1000
+ trap cleanup EXIT
+ ip netns add ns
+ ip netns exec ns sysctl -w 'net.ipv4.ping_group_range=0 2147483647'
+ ip -netns ns link add type dummy
+ ip -netns ns link set dev dummy0 up
+ ip -netns ns addr add 172.16.0.1/24 dev dummy0
+ ip -netns ns addr add 2001:db8:1::1/64 dev dummy0
+ ip -netns ns rule add fwmark 1000 lookup 300
+ ip -6 -netns ns rule add fwmark 1000 lookup 300
+ ip -netns ns route add prohibit any table 300
+ ip -6 -netns ns route add prohibit any table 300
+ BAD=0
+ TOTAL=0
+ for ovr in setsock cmsg both
+ for i in 4 6
+ '[' 4 == 4 ']'
+ TGT=172.16.0.2
+ for p in u i r
+ '[' u == u ']'
+ prot=UDP
+ '[' u == i ']'
+ '[' u == r ']'
+ '[' setsock == setsock ']'
+ m=-M
+ '[' setsock == cmsg ']'
+ '[' setsock == both ']'
+ ip netns exec ns ./cmsg_sender -4 -p u -M 1001 172.16.0.2 1234
(test stuck here)