Following update of debug info from zimbra ubuntu instance
1) screen cannot be started
-----------------------------
zimbra@b87509dd-33f1-cbdb-f444-f4ae30fed80a:/tmp$ tty
/dev/pts/4
zimbra@b87509dd-33f1-cbdb-f444-f4ae30fed80a:/tmp$ screen
Cannot open your terminal '/dev/pts/4' - please check.
2) htop - 50-60 seconds to show main screen
---------------------------------------------
I was wrong, htop is NOT freezing, it slow in opening.
We need about 50 seconds to wat for the main screen. After that, it is
responsive.
3) strace htop
--------------------
This can be interesting:
> ioprio_get(0x1, 0x1832d) = -1 ENOSYS (Function not implemented)
...
This is repeating sequence for reading active processes:
openat(AT_FDCWD, "/proc/98381/task", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC)
= 4
getdents(4, /* 89 entries */, 32768) = 2816
openat(AT_FDCWD, "/proc/98381/task/98386/task",
O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = -1 ENOENT (No such file or
directory)
open("/proc/98381/task/98386/io", O_RDONLY) = -1 ENOENT (No such file or
directory)
open("/proc/98381/task/98386/statm", O_RDONLY) = 5
fstat(5, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7fffff0a0000
read(5, "121998 107973 0 107973 0 0 0\n", 512) = 29
close(5) = 0
munmap(0x7fffff0a0000, 4096) = 0
open("/proc/98381/task/98386/stat", O_RDONLY) = 5
fstat(5, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7fffff0a0000
read(5, "98386 (java) S 98380 98381 98380"..., 2048) = 176
read(5, "", 1536) = 0
close(5) = 0
munmap(0x7fffff0a0000, 4096) = 0
ioprio_get(0x1, 0x18052) = -1 ENOSYS (Function not implemented)
stat("/proc/98381/task/98386", {st_mode=S_IFDIR|0555, st_size=224, ...}) = 0
access("/proc/vz", R_OK) = -1 ENOENT (No such file or directory)
open("/proc/98381/task/98386/cgroup", O_RDONLY) = -1 ENOENT (No such file or
directory)
open("/proc/98381/task/98386/status", O_RDONLY) = 5
fstat(5, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7fffff0a0000
read(5, "Name:\tjava\nState:\tS (sleeping)\nT"..., 512) = 468
read(5, "", 512) = 0
close(5) = 0
munmap(0x7fffff0a0000, 4096) = 0
open("/proc/98381/task/98386/cmdline", O_RDONLY) = 5
fstat(5, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7fffff0a0000
read(5, "/opt/zimbra/java/bin/java\0-Dfile"..., 4096) = 1124
read(5, "", 2560) = 0
close(5) = 0
munmap(0x7fffff0a0000, 4096) = 0
I suppose something in this sequence is problematic.
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