lsns from util-linux 2.28.1 does not display anything on my system.
End of strace output:
open("/proc/31676", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 4
fstat(4, {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
fstat(4, {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
openat(4, "stat", O_RDONLY) = 5
fcntl(5, F_GETFL) = 0x8000 (flags O_RDONLY|O_LARGEFILE)
fstat(5, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
read(5, "31676 (ext4-rsv-conver) S 2 0 0 "..., 1024) = 169
newfstatat(4, "ns/mnt", {st_mode=S_IFREG|0444, st_size=0, ...}, 0) = 0
newfstatat(4, "ns/net", {st_mode=S_IFREG|0444, st_size=0, ...}, 0) = 0
newfstatat(4, "ns/pid", {st_mode=S_IFREG|0444, st_size=0, ...}, 0) = 0
newfstatat(4, "ns/uts", {st_mode=S_IFREG|0444, st_size=0, ...}, 0) = 0
newfstatat(4, "ns/ipc", {st_mode=S_IFREG|0444, st_size=0, ...}, 0) = 0
newfstatat(4, "ns/user", 0x7ffd30d84020, 0) = -1 ENOENT (No such file
or directory)
close(5) = 0
close(4) = 0
getdents(3, /* 0 entries */, 32768) = 0
close(3) = 0
close(1) = 0
close(2) = 0
exit_group(0) = ?
+++ exited with 0 +++
I have user namespaces disabled in my kernel (CONFIG_USER_NS=n).
I thinkthe reason for the empty output is that the ENOENT for ns/user
causes read_process to ignore the process completely.
Thanks,
--
Michał Bartoszkiewicz <mbartoszkiewicz@xxxxxxxxx>
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