[Xen-users] Problem Aide Xen (fwd)

[Torsten Lehmann <tlehmann@xxxxxxxxxxxxx>]

Hello!

I had a problem with xen and aide.
This could be interressant also for the developer of XEN and AIDE.
Details see attachment.
The full (german) document is avaible to
http://www2.fh-lausitz.de/launic/os-tips/xen/050707.prob_reboot



regards tl

--
Torsten lehmann
Member of LauNOC

050707.prob_reboot_en_small
- zu 050707.prob_reboot


Problem:
--------
- at special times the computer reboots hisself (after installation of XEN)


----------------------------------------------------------------------------
Diag:
------

- top:

top - 02:07:22 up  5:44,  2 users,  load average: 0.28, 0.06, 0.02
Tasks:  78 total,   3 running,  75 sleeping,   0 stopped,   0 zombie
Cpu(s):  8.3% us,  1.3% sy,  0.0% ni,  0.0% id, 90.3% wa,  0.0% hi,  0.0% si
Mem:   1918324k total,   535060k used,  1383264k free,   131932k buffers
Swap:  2056312k total,        0k used,  2056312k free,   245220k cached
Read from remote host vicky.xxxxxxxxxxxxxx.de: Connection reset by peer
Connection to vicky.xxxxxxxxxxxxxx.de closed. %MEM    TIME+  COMMAND
pc-hl133 # ~ $  18   0  4212 3572  420 R  9.7  0.2   0:09.09 aide.real
    1 root      16   0  1576  512  452 S  0.0  0.0   0:00.70 init
    2 root      34  19     0    0    0 S  0.0  0.0   0:00.00 ksoftirqd/0
    3 root      10  -5     0    0    0 S  0.0  0.0   0:00.00 events/0
....
  - running aide
  - alloc few RAM


- Version
  - debian testing
vicky:~# uname -r
2.6.11.10-xen0
vicky:~# aide.real -v
Aide, version 0.10
Compiled with the following options
WITH_GCRYPT
WITH_MHASH
CONFIG_FILE = "/var/lib/aide/aide.conf.autogenerated"


- test strace aide
----%<----
vicky:~# strace aide.real -c /etc/aide/aide.root.conf -C
...
open("/sys/devices/pci0000:00/0000:00:1f.0/subsystem_vendor", O_RDONLY) = 5
fstat64(5, {st_mode=S_IFREG|0444, st_size=4096, ...}) = 0
old_mmap(NULL, 4096, PROT_READ, MAP_SHARED, 5, 0) = -1 ENODEV (No such device)
write(1, "error mmap\'ing /sys/devices/pci0"..., 69error mmap'ing /sys/devices/r
) = 69
close(5)                                = 0
lstat64("/sys/devices/pci0000:00/0000:00:1f.0/device", {st_mode=S_IFREG|0444, s0
time(NULL)                              = 1120727156
open("/sys/devices/pci0000:00/0000:00:1f.0/device", O_RDONLY) = 5
fstat64(5, {st_mode=S_IFREG|0444, st_size=4096, ...}) = 0
old_mmap(NULL, 4096, PROT_READ, MAP_SHARED, 5, 0) = -1 ENODEV (No such device)
write(1, "error mmap\'ing /sys/devices/pci0"..., 59error mmap'ing /sys/devices/e
) = 59
close(5)                                = 0
lstat64("/sys/devices/pci0000:00/0000:00:1f.0/vendor", {st_mode=S_IFREG|0444, s0
time(NULL)                              = 1120727156
open("/sys/devices/pci0000:00/0000:00:1f.0/vendor", O_RDONLY) = 5
fstat64(5, {st_mode=S_IFREG|0444, st_size=4096, ...}) = 0
old_mmap(NULL, 4096, PROT_READ, MAP_SHARED, 5, 0) = -1 ENODEV (No such device)
write(1, "error mmap\'ing /sys/devices/pci0"..., 59error mmap'ing /sys/devices/r
) = 59
close(5)                                = 0
lstat64("/sys/devices/pci0000:00/0000:00:1f.0/resource", {st_mode=S_IFREG|0444,0
time(NULL)                              = 1120727156
open("/sys/devices/pci0000:00/0000:00:1f.0/resource", O_RDONLY) = 5
fstat64(5, {st_mode=S_IFREG|0444, st_size=4096, ...}) = 0
old_mmap(NULL, 4096, PROT_READ, MAP_SHARED, 5, 0) = -1 ENODEV (No such device)
write(1, "error mmap\'ing /sys/devices/pci0"..., 61error mmap'ing /sys/devices/e
) = 61
close(5)                                = 0
lstat64("/sys/devices/pci0000:00/0000:00:1f.0/detach_state", {st_mode=S_IFREG|00
time(NULL)                              = 1120727156
open("/sys/devices/pci0000:00/0000:00:1f.0/detach_state", O_RDONLY) = 5
fstat64(5, {st_mode=S_IFREG|0644, st_size=4096, ...}) = 0
old_mmap(NULL, 4096, PROT_READ, MAP_SHARED, 5, 0) = -1 ENODEV (No such device)
write(1, "error mmap\'ing /sys/devices/pci0"..., 65error mmap'ing /sys/devices/e
) = 65
close(5)                                = 0
getdents64(3, /* 0 entries */, 4096)    = 0
getdents64(3, /* 0 entries */, 4096)    = 0
close(3)                                = 0
open("/sys/devices/pci0000:00/0000:00:1e.0", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_3
fstat64(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
getdents64(3, /* 15 entries */, 4096)   = 472
lstat64("/sys/devices/pci0000:00/0000:00:1e.0/config", {st_mode=S_IFREG|0644, s0
time(NULL)                              = 1120727156
open("/sys/devices/pci0000:00/0000:00:1e.0/config", O_RDONLY) = 5
fstat64(5, {st_mode=S_IFREG|0644, st_size=256, ...}) = 0
old_mmap(NULL, 256, PROT_READ, MAP_SHARED, 5, 0) = -1 EINVAL (Invalid argument)
write(1, "error mmap\'ing /sys/devices/pci0"..., 59error mmap'ing /sys/devices/g
) = 59
close(5)                                = 0
lstat64("/sys/devices/pci0000:00/0000:00:1e.0/0000:01:0c.0", {st_mode=S_IFDIR|00
time(NULL)                              = 1120727156
lstat64("/sys/devices/pci0000:00/0000:00:1e.0/0000:01:0a.0", {st_mode=S_IFDIR|00
time(NULL)                              = 1120727156
lstat64("/sys/devices/pci0000:00/0000:00:1e.0/0000:01:09.0", {st_mode=S_IFDIR|00
time(NULL)                              = 1120727156
lstat64("/sys/devices/pci0000:00/0000:00:1e.0/local_cpus", {st_mode=S_IFREG|0440
time(NULL)                              = 1120727156
open("/sys/devices/pci0000:00/0000:00:1e.0/local_cpus", O_RDONLY) = 5
fstat64(5, Read from remote host vicky.xxxxxxxxxxxxxx.de: Connection reset by pr
Connection to vicky.xxxxxxxxxxxxxx.de closed.
----%<----

  - aide cannot read file in directory /sys 
  - /sys is similar to /proc
  
  - readtest:
    vicky:~# tar -cvf /dev/null /sys
    -> OK
    - thats why Dir /sys can read succesfull

reasons: 
  - aide has a bug
  - But why does the computer hang up?


workaround:
  - aide: in aide.conf Dir /sys disablen: 
        ## fix xen
        =/sys$ StaticDir
        !/sys


  - xen-devel: moving /sys to /proc/xen/sys 
 

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