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From: Herbert Poetzl (herbert_at_13thfloor.at)
Date: Wed 30 Jun 2004 - 12:43:46 BST


On Wed, Jun 30, 2004 at 12:50:02PM +0200, Gebhardt Thomas wrote:
> Hi,
>
> also hit that issue:
>
> > On Sun, Nov 30, 2003 at 12:15:17PM +0100, desman_at_gmx.de wrote:
> >> hi,
> >>
> >> at some commands within the vserver context i get "Unknown HZ value!
> (47255)
> >> Assume 100."
>
> >hmm, sounds like a 'side-effect' of the uptime
> >modifications, but I thought we had fixed that,
> >could you please provide an strace (version >= 4.5)
> >of one of the 'complaining' tools (ps would be nice)?
>
> and unfortunately did not find any followup to this thread.
>
> We are running Linux version 2.4.24-vs1.22 with Debian woody
> on the vserver, getting
>
> Has the culprit already been caught?

well, yes ...

the tools are buggy ... they try to deduce the
HZ value from observing the /proc/interrupt
values ... (which is just plain stupid), and
so they fail from time to time ...

possible reasons:

 - system was booted recently
 - variable HZ values (powersaving/APM)
 - different default HZ (2.6 kernel)
 - your explanation here ...

vs1.22 does not include/do any uptime virtualization
so the 'vserver' aspect isn't relevant here, and
updating the (old/broken) tools (psutils) to a
more sane version works ...

HTH,
Herbert

>
> Thanks, Thomas
>
> # uptime
> Unknown HZ value! (11) Assume 100.
> 12:43:19 up 140 days, 20:17, 0 users, load average: 2.24, 1.64, 1.33
>
> # strace -V
> strace -- version 4.5.5
> # strace uptime
> execve("/usr/bin/uptime", ["uptime"], [/* 17 vars */]) = 0
> uname({sys="Linux", node="********", ...}) = 0
> brk(0) = 0x8049838
> open("/etc/ld.so.preload", O_RDONLY) = -1 ENOENT (No such file or
> directory)
> open("/etc/ld.so.cache", O_RDONLY) = 3
> fstat64(3, {st_mode=S_IFREG|0644, st_size=8310, ...}) = 0
> old_mmap(NULL, 8310, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40014000
> close(3) = 0
> open("/lib/libproc.so.2.0.7", O_RDONLY) = 3
> read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\200 \0"..., 1024) =
> 1024
> fstat64(3, {st_mode=S_IFREG|0644, st_size=35428, ...}) = 0
> old_mmap(NULL, 45708, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40017000
> mprotect(0x4001f000, 12940, PROT_NONE) = 0
> old_mmap(0x4001f000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3,
> 0x8000) = 0x4001f000
> old_mmap(0x40020000, 8844, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|
> MAP_ANONYMOUS, -1, 0) = 0x40020000
> close(3) = 0
> open("/lib/libc.so.6", O_RDONLY) = 3
> read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\30\222"..., 1024) =
> 1024
> fstat64(3, {st_mode=S_IFREG|0755, st_size=1153784, ...}) = 0
> old_mmap(NULL, 1166560, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40023000
> mprotect(0x40136000, 40160, PROT_NONE) = 0
> old_mmap(0x40136000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3,
> 0x113000) = 0x40136000
> old_mmap(0x4013c000, 15584, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|
> MAP_ANONYMOUS, -1, 0) = 0x4013c000
> close(3) = 0
> old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x40140000
> munmap(0x40014000, 8310) = 0
> uname({sys="Linux", node="************", ...}) = 0
> brk(0) = 0x8049838
> brk(0x80499b8) = 0x80499b8
> brk(0x804a000) = 0x804a000
> open("/etc/mtab", O_RDONLY) = 3
> fstat64(3, {st_mode=S_IFREG|0644, st_size=94, ...}) = 0
> old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x40014000
> read(3, "/dev/hdv1 / ext3 defaults 1 1\n/d"..., 4096) = 94
> read(3, "", 4096) = 0
> close(3) = 0
> munmap(0x40014000, 4096) = 0
> open("/proc/cpuinfo", O_RDONLY) = 3
> fstat64(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
> old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x40014000
> read(3, "processor\t: 0\nvendor_id\t: Genuin"..., 4096) = 1712
> read(3, "", 4096) = 0
> close(3) = 0
> munmap(0x40014000, 4096) = 0
> open("/proc/uptime", O_RDONLY) = 3
> lseek(3, 0, SEEK_SET) = 0
> read(3, "12169224.91 10446013.16\n", 1023) = 24
> open("/proc/stat", O_RDONLY) = 4
> lseek(4, 0, SEEK_SET) = 0
> read(4, "cpu 96423827 343762647 10835247"..., 1023) = 950
> lseek(3, 0, SEEK_SET) = 0
> read(3, "12169224.91 10446013.16\n", 1023) = 24
> write(2, "Unknown HZ value! (11) Assume 10"..., 35Unknown HZ value! (11)
> Assume 100.
> ) = 35
> time([1088592346]) = 1088592346
> open("/etc/localtime", O_RDONLY) = 5
> fstat64(5, {st_mode=S_IFREG|0644, st_size=837, ...}) = 0
> old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x40014000
> read(5, "TZif\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\10\0\0\0\10"..., 4096) =
> 837
> close(5) = 0
> munmap(0x40014000, 4096) = 0
> lseek(3, 0, SEEK_SET) = 0
> read(3, "12169224.91 10446013.16\n", 1023) = 24
> access("/var/run/utmpx", F_OK) = -1 ENOENT (No such file or
> directory)
> open("/var/run/utmp", O_RDWR) = 5
> fcntl64(5, F_GETFD) = 0
> fcntl64(5, F_SETFD, FD_CLOEXEC) = 0
> _llseek(5, 0, [0], SEEK_SET) = 0
> alarm(0) = 0
> rt_sigaction(SIGALRM, {0x40117bb0, [], SA_RESTORER, 0x4004c6b8}, {SIG_DFL}, 8)
> = 0
> alarm(1) = 0
> fcntl64(5, F_SETLKW, {type=F_RDLCK, whence=SEEK_SET, start=0, len=0}) = 0
> read(5, "\1\0\0\0002#\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 384) =
> 384
> fcntl64(5, F_SETLKW, {type=F_UNLCK, whence=SEEK_SET, start=0, len=0}) = 0
> rt_sigaction(SIGALRM, {SIG_DFL}, NULL, 8) = 0
> alarm(0) = 1
> alarm(0) = 0
> rt_sigaction(SIGALRM, {0x40117bb0, [], SA_RESTORER, 0x4004c6b8}, {SIG_DFL}, 8)
> = 0
> alarm(1) = 0
> fcntl64(5, F_SETLKW, {type=F_RDLCK, whence=SEEK_SET, start=0, len=0}) = 0
> read(5, "", 384) = 0
> fcntl64(5, F_SETLKW, {type=F_UNLCK, whence=SEEK_SET, start=0, len=0}) = 0
> rt_sigaction(SIGALRM, {SIG_DFL}, NULL, 8) = 0
> alarm(0) = 1
> close(5) = 0
> open("/proc/loadavg", O_RDONLY) = 5
> lseek(5, 0, SEEK_SET) = 0
> read(5, "1.22 1.48 1.31 3/175 20588\n", 1023) = 27
> fstat64(1, {st_mode=S_IFCHR|0600, st_rdev=makedev(136, 2), ...}) = 0
> old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x40014000
> write(1, " 12:45:46 up 140 days, 20:20, 0"..., 72 12:45:46 up 140 days,
> 20:20, 0 users, load average: 1.22, 1.48, 1.31
> ) = 72
> munmap(0x40014000, 4096) = 0
> _exit(0) = ?
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