Mon, 31 Jan 2011 22:16:24 +0100 Hello Herbert, Thanks for a quick reply. On Mon, Jan 31, 2011 at 7:41 PM, Herbert Poetzl <herbert@13thfloor.at> wrote: > On Mon, Jan 31, 2011 at 06:38:56PM +0100, Petar Hitij wrote: >> Hello everybody, > >> I have the following problem: > >> 1. host system: Debian squeeze >> uname -na >> Linux vitez0 2.6.32-5-vserver-amd64 #1 SMP Wed Jan 12 >> 05:05:13 UTC 2011 x86 64 GNU/Linux > >> 2. guest system was rsync-ed from old server, it contains >> RedHat 9 32bit instance > > is it configured as 32bit guest? > i.e. is the personality set correctly? It wasn't, I fixed it and the segfault is still there. There are 3 other 32 bit guests on this host without the problem (Debian lenny). > >> 3. guest starts ok (mysql, apache, postfix...), ps command >> (and top) segfaults when it looks into /proc/meminfo. > > segfaults are usually (not always) a problem in > the userspace code, where a point is dereferenced > which points into forbidden space ... > >> I have tried to limit memory - cflags VIRTMEM - rlimits/rss >> 200000, it didn't help. I cannot list processes in a vserver. > >> Best regards >> Petar Hitij > >> guest >> ============ > >> open("/proc/meminfo", O RDONLY) = 5 >> lseek(5, 0, SEEK SET) = 0 >> read(5, "MemTotal: 800000 kB\nMemF"..., 1023) = 1023 >> --- SIGSEGV (Segmentation fault) @ 0 (0) --- >> +++ killed by SIGSEGV +++ > > that looks like a bug in ps/top but of course, it > could be a bunch of other things as well, try to > install a debug version (or build it from source > with debug info) and examine with gdb ... The old host is 32bit, I could try 32bit kernel on new host to work around the problem. If that works it will by me some time to fix it properly. > >> [root@nfp-si /]# cat /etc/redhat-release >> Red Hat Linux release 9 (Shrike) > >> [root@nfp-si /]# ls >> bin boot dev etc home initrd lib lost+found misc mnt opt >> poweroff proc root sbin suitespot tmp usr var > >> [root@nfp-si /]# cd /proc > >> [root@nfp-si proc]# df >> Filesystem 1K-blocks Used Available Use% Mounted on >> /dev/hdv1 58831036 44385408 11457188 80% / > >> [root@nfp-si proc]# mount >> /dev/hdv1 on / type ufs (defaults) >> none on /proc type proc (defaults) >> none on /dev/pts type devpts (gid=5,mode=620) > >> [root@nfp-si proc]# cat /proc/meminfo >> MemTotal: 800000 kB >> MemFree: 156044 kB >> Buffers: 451044 kB >> Cached: 0 kB >> SwapCached: 0 kB >> Active: 1062608 kB >> Inactive: 14134812 kB >> Active(anon): 199536 kB >> Inactive(anon): 9772 kB >> Active(file): 863072 kB >> Inactive(file): 14125040 kB >> Unevictable: 0 kB >> Mlocked: 0 kB >> SwapTotal: 0 kB >> SwapFree: 0 kB >> Dirty: 4 kB >> Writeback: 0 kB >> AnonPages: 208188 kB >> Mapped: 19864 kB >> Shmem: 1200 kB >> Slab: 666744 kB >> SReclaimable: 637332 kB >> SUnreclaim: 29412 kB >> KernelStack: 2896 kB >> PageTables: 4652 kB >> NFS Unstable: 0 kB >> Bounce: 0 kB >> WritebackTmp: 0 kB >> CommitLimit: 13111820 kB >> Committed AS: 798836 kB >> VmallocTotal: 34359738367 kB >> VmallocUsed: 111536 kB >> VmallocChunk: 34350727048 kB >> HardwareCorrupted: 0 kB >> HugePages Total: 0 >> HugePages Free: 0 >> HugePages Rsvd: 0 >> HugePages Surp: 0 >> Hugepagesize: 2048 kB >> DirectMap4k: 6384 kB >> DirectMap2M: 2080768 kB >> DirectMap1G: 14680064 kB > > looks fine to me, although the values might be > too large for a 32bit system ... > >> Host >> =============== >> >> vitez0:~# vserver-info >> Versions: >> Kernel: 2.6.32-5-vserver-amd64 >> VS-API: 0x00020305 >> util-vserver: 0.30.215; Jun 18 2010, 13:35:17 > > this should be definitely updated, as it is not > able to create safe guests (i.e. the isolation > will be incomplete and it should be trivial to > hurt the host and/or escape the guest) > Thank you, will plan for a update. Best regards Petar > HTH, > Herbert > >> Features: >> CC: gcc, gcc (Debian 4.4.4-5) 4.4.4 >> CXX: g++, g++ (Debian 4.4.4-5) 4.4.4 >> CPPFLAGS: '' >> CFLAGS: '-Wall -g -O2 -std=c99 -Wall -pedantic -W >> -funit-at-a-time' >> CXXFLAGS: '-g -O2 -ansi -Wall -pedantic -W >> -fmessage-length=0 -funit-at-a-time' >> build/host: x86 64-pc-linux-gnu/x86 64-pc-linux-gnu >> Use dietlibc: yes >> Build C++ programs: yes >> Build C99 programs: yes >> Available APIs: v13,net,v21,v22,v23,netv2 >> ext2fs Source: e2fsprogs >> syscall(2) invocation: alternative >> vserver(2) syscall#: 236/glibc >> crypto api: nss >> python bindings: no >> use library versioning: yes >> >> Paths: >> prefix: /usr >> sysconf-Directory: /etc >> cfg-Directory: /etc/vservers >> initrd-Directory: $(sysconfdir)/init.d >> pkgstate-Directory: /var/run/vservers >> vserver-Rootdir: /var/lib/vservers >> >> >> Assumed 'SYSINFO' as no other option given; try '--help' for more information. >