execve("/usr/bin/ip", ["ip", "netns", "exec", "mynamespace", "fish"], 0x7ffff0408230 /* 31 vars */) = 0
brk(NULL)                               = 0x55b76ee3c000
arch_prctl(0x3001 /* ARCH_??? */, 0x7ffdbe08ccf0) = -1 EINVAL (Invalid argument)
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=191591, ...}, AT_EMPTY_PATH) = 0
mmap(NULL, 191591, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f87d670c000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/libbpf.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
newfstatat(3, "", {st_mode=S_IFREG|0755, st_size=375216, ...}, AT_EMPTY_PATH) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f87d670a000
mmap(NULL, 377488, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f87d66ad000
mmap(0x7f87d66b8000, 229376, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xb000) = 0x7f87d66b8000
mmap(0x7f87d66f0000, 90112, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x43000) = 0x7f87d66f0000
mmap(0x7f87d6706000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x58000) = 0x7f87d6706000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/libelf.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
newfstatat(3, "", {st_mode=S_IFREG|0755, st_size=112656, ...}, AT_EMPTY_PATH) = 0
mmap(NULL, 110616, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f87d6691000
mmap(0x7f87d6695000, 73728, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x4000) = 0x7f87d6695000
mmap(0x7f87d66a7000, 16384, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x16000) = 0x7f87d66a7000
mmap(0x7f87d66ab000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1a000) = 0x7f87d66ab000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/libmnl.so.0", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
newfstatat(3, "", {st_mode=S_IFREG|0755, st_size=26456, ...}, AT_EMPTY_PATH) = 0
mmap(NULL, 28688, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f87d6689000
mprotect(0x7f87d668b000, 16384, PROT_NONE) = 0
mmap(0x7f87d668b000, 8192, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f87d668b000
mmap(0x7f87d668d000, 4096, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x4000) = 0x7f87d668d000
mmap(0x7f87d668f000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x5000) = 0x7f87d668f000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/libcap.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0 s\0\0\0\0\0\0"..., 832) = 832
newfstatat(3, "", {st_mode=S_IFREG|0755, st_size=42992, ...}, AT_EMPTY_PATH) = 0
mmap(NULL, 45128, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f87d667d000
mmap(0x7f87d6680000, 20480, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f87d6680000
mmap(0x7f87d6685000, 8192, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x8000) = 0x7f87d6685000
mmap(0x7f87d6687000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x9000) = 0x7f87d6687000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\220~\2\0\0\0\0\0"..., 832) = 832
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784
newfstatat(3, "", {st_mode=S_IFREG|0755, st_size=2366592, ...}, AT_EMPTY_PATH) = 0
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784
mmap(NULL, 2411920, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f87d6400000
mmap(0x7f87d6426000, 1437696, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x26000) = 0x7f87d6426000
mmap(0x7f87d6585000, 348160, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x185000) = 0x7f87d6585000
mmap(0x7f87d65da000, 417792, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1d9000) = 0x7f87d65da000
mmap(0x7f87d6640000, 52624, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f87d6640000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/libz.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
newfstatat(3, "", {st_mode=S_IFREG|0755, st_size=100296, ...}, AT_EMPTY_PATH) = 0
mmap(NULL, 102416, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f87d6663000
mmap(0x7f87d6666000, 57344, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f87d6666000
mmap(0x7f87d6674000, 28672, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x11000) = 0x7f87d6674000
mmap(0x7f87d667b000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x17000) = 0x7f87d667b000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/libzstd.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
newfstatat(3, "", {st_mode=S_IFREG|0755, st_size=862080, ...}, AT_EMPTY_PATH) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f87d6661000
mmap(NULL, 860224, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f87d632d000
mmap(0x7f87d6339000, 724992, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xc000) = 0x7f87d6339000
mmap(0x7f87d63ea000, 81920, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xbd000) = 0x7f87d63ea000
mmap(0x7f87d63fe000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xd1000) = 0x7f87d63fe000
close(3)                                = 0
mmap(NULL, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f87d665e000
arch_prctl(ARCH_SET_FS, 0x7f87d665e740) = 0
set_tid_address(0x7f87d665ea10)         = 9288
set_robust_list(0x7f87d665ea20, 24)     = 0
rseq(0x7f87d665f060, 0x20, 0, 0x53053053) = 0
mprotect(0x7f87d65da000, 409600, PROT_READ) = 0
mprotect(0x7f87d63fe000, 4096, PROT_READ) = 0
mprotect(0x7f87d667b000, 4096, PROT_READ) = 0
mprotect(0x7f87d6687000, 4096, PROT_READ) = 0
mprotect(0x7f87d668f000, 4096, PROT_READ) = 0
mprotect(0x7f87d66ab000, 4096, PROT_READ) = 0
mprotect(0x7f87d6706000, 12288, PROT_READ) = 0
mprotect(0x55b76eb42000, 12288, PROT_READ) = 0
mprotect(0x7f87d676c000, 8192, PROT_READ) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
munmap(0x7f87d670c000, 191591)          = 0
prctl(PR_CAPBSET_READ, CAP_MAC_OVERRIDE) = 1
prctl(PR_CAPBSET_READ, 0x30 /* CAP_??? */) = -1 EINVAL (Invalid argument)
prctl(PR_CAPBSET_READ, CAP_CHECKPOINT_RESTORE) = 1
prctl(PR_CAPBSET_READ, 0x2c /* CAP_??? */) = -1 EINVAL (Invalid argument)
prctl(PR_CAPBSET_READ, 0x2a /* CAP_??? */) = -1 EINVAL (Invalid argument)
prctl(PR_CAPBSET_READ, 0x29 /* CAP_??? */) = -1 EINVAL (Invalid argument)
getuid()                                = 0
socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC, NETLINK_ROUTE) = 3
setsockopt(3, SOL_SOCKET, SO_SNDBUF, [32768], 4) = 0
setsockopt(3, SOL_SOCKET, SO_RCVBUF, [1048576], 4) = 0
setsockopt(3, SOL_NETLINK, NETLINK_EXT_ACK, [1], 4) = 0
bind(3, {sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, 12) = 0
getsockname(3, {sa_family=AF_NETLINK, nl_pid=9288, nl_groups=00000000}, [12]) = 0
setsockopt(3, SOL_NETLINK, NETLINK_GET_STRICT_CHK, [1], 4) = 0
socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC, NETLINK_ROUTE) = 4
setsockopt(4, SOL_SOCKET, SO_SNDBUF, [32768], 4) = 0
setsockopt(4, SOL_SOCKET, SO_RCVBUF, [1048576], 4) = 0
setsockopt(4, SOL_NETLINK, NETLINK_EXT_ACK, [1], 4) = 0
bind(4, {sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, 12) = 0
getsockname(4, {sa_family=AF_NETLINK, nl_pid=-316162688, nl_groups=00000000}, [12]) = 0
getpid()                                = 9288
getrandom("\x02\x4b\x06\x06\x9e\xf2\xee\xf2", 8, GRND_NONBLOCK) = 8
brk(NULL)                               = 0x55b76ee3c000
brk(0x55b76ee5d000)                     = 0x55b76ee5d000
openat(AT_FDCWD, "/proc/9288/cgroup", O_RDONLY) = 5
newfstatat(5, "", {st_mode=S_IFREG|0444, st_size=0, ...}, AT_EMPTY_PATH) = 0
read(5, "0::/user.slice/user-1000.slice/u"..., 1024) = 141
read(5, "", 1024)                       = 0
close(5)                                = 0
openat(AT_FDCWD, "/var/run/netns/mynamespace", O_RDONLY|O_CLOEXEC) = 5
setns(5, CLONE_NEWNET)                  = -1 EINVAL (Invalid argument)
write(2, "setting the network namespace \"y"..., 64setting the network namespace "mynamespace" failed: Invalid argument
) = 64
close(5)                                = 0
exit_group(-1)                          = ?
+++ exited with 255 +++