On 03/15/2013 12:10 AM, richard -rw- weinberger wrote: > Time to look at UML's __get_user(). Just FWIW the "memdup_user:" debug-patch-line is not only triggered by trinity. It happens even if I regularly boot a UML guest (stable Gentoo x86): $ /usr/local/bin/linux-v3.9-rc2-292-ga2362d2 earlyprintk ubda=/home/tfoerste/virtual/uml/trinity ubdb=/mnt/ramdisk/swap_trinity eth0=tuntap,tap0,72:ef:3d:9f:c3:5a mem=768M con=pts con0=fd:0,fd:1 umid=uml Locating the bottom of the address space ... 0x1000 Locating the top of the address space ... 0xc0000000 Core dump limits : soft - NONE hard - NONE Checking that ptrace can change system call numbers...OK Checking syscall emulation patch for ptrace...OK Checking advanced syscall emulation patch for ptrace...OK Checking for tmpfs mount on /dev/shm...OK Checking PROT_EXEC mmap in /dev/shm/...OK Checking for the skas3 patch in the host: - /proc/mm...not found: No such file or directory - PTRACE_FAULTINFO...not found - PTRACE_LDT...not found UML running in SKAS0 mode Adding 9842688 bytes to physical memory to account for exec-shield gap bootconsole [earlycon0] enabled PID hash table entries: 4096 (order: 2, 16384 bytes) Dentry cache hash table entries: 131072 (order: 7, 524288 bytes) Inode-cache hash table entries: 65536 (order: 6, 262144 bytes) Memory: 768308k available SLUB: Genslabs=15, HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1 NR_IRQS:15 Calibrating delay loop... 3461.12 BogoMIPS (lpj=17305600) pid_max: default: 32768 minimum: 301 Mount-cache hash table entries: 512 Checking for host processor cmov support...Yes Checking that host ptys support output SIGIO...Yes Checking that host ptys support SIGIO on close...No, enabling workaround memdup_user: 9 memdup_user: 9 devtmpfs: initialized Using 2.6 host AIO NET: Registered protocol family 16 bio: create slab <bio-0> at 0 Switching to clocksource itimer NET: Registered protocol family 2 TCP established hash table entries: 8192 (order: 4, 65536 bytes) TCP bind hash table entries: 8192 (order: 3, 32768 bytes) TCP: Hash tables configured (established 8192 bind 8192) TCP: reno registered UDP hash table entries: 512 (order: 1, 8192 bytes) UDP-Lite hash table entries: 512 (order: 1, 8192 bytes) NET: Registered protocol family 1 RPC: Registered named UNIX socket transport module. RPC: Registered udp transport module. RPC: Registered tcp transport module. RPC: Registered tcp NFSv4.1 backchannel transport module. mconsole (version 2) initialized on /home/tfoerste/.uml/uml/mconsole Checking host MADV_REMOVE support...OK UML Audio Relay (host dsp = /dev/sound/dsp, host mixer = /dev/sound/mixer) Host TLS support detected Detected host type: i386 (GDT indexes 6 to 9) audit: initializing netlink socket (disabled) type=2000 audit(1363372747.842:1): initialized NFS: Registering the id_resolver key type Key type id_resolver registered Key type id_legacy registered nfs4filelayout_init: NFSv4 File Layout Driver Registering... Installing knfsd (copyright (C) 1996 okir@xxxxxxxxxxxx). msgmni has been set to 1500 alg: No test for stdrng (krng) Block layer SCSI generic (bsg) driver version 0.4 loaded (major 254) io scheduler noop registered (default) tun: Universal TUN/TAP device driver, 1.6 tun: (C) 1999-2004 Max Krasnyansky <maxk@xxxxxxxxxxxx> device-mapper: uevent: version 1.0.3 device-mapper: ioctl: 4.24.0-ioctl (2013-01-15) initialised: dm-devel@xxxxxxxxxx TCP: cubic registered NET: Registered protocol family 17 Key type dns_resolver registered Initialized stdio console driver Console initialized on /dev/tty0 console [tty0] enabled, bootconsole disabled console [tty0] enabled, bootconsole disabled Initializing software serial port version 1 console [mc-1] enabled ubda: unknown partition table ubdb: unknown partition table Netdevice 0 (72:ef:3d:9f:c3:5a) : TUN/TAP backend - memdup_user: 5 memdup_user: 10 EXT3-fs (ubda): error: couldn't mount because of unsupported optional features (240) memdup_user: 5 memdup_user: 10 EXT2-fs (ubda): error: couldn't mount because of unsupported optional features (244) memdup_user: 5 memdup_user: 10 EXT4-fs (ubda): INFO: recovery required on readonly filesystem EXT4-fs (ubda): write access will be enabled during recovery EXT4-fs (ubda): orphan cleanup on readonly fs EXT4-fs (ubda): 60 orphan inodes deleted EXT4-fs (ubda): recovery complete EXT4-fs (ubda): mounted filesystem with ordered data mode. Opts: (null) VFS: Mounted root (ext4 filesystem) readonly on device 98:0. memdup_user: 9 memdup_user: 9 devtmpfs: mounted memdup_user: 2 INIT: version 2.88 booting OpenRC 0.11.8 is starting up Gentoo Linux (i686) [UML] * Mounting /proc ... memdup_user: 5 memdup_user: 5 [ ok ] * Mounting /run ... memdup_user: 6 memdup_user: 6 * /run/openrc: creating directory * /run/lock: creating directory * /run/lock: correcting owner * Using /dev mounted from kernel ... [ ok ] * Mounting /dev/pts ... memdup_user: 7 memdup_user: 7 [ ok ] * Mounting /dev/shm ... memdup_user: 6 memdup_user: 4 [ ok ] * Mounting /sys ... [ ok ] * Mounting cgroup filesystem ... [ ok ] * Starting udev ... [ ok ] * Populating /dev with existing devices through uevents ... [ ok ] * Waiting for uevents to be processed ... [ ok ] * Setting up dm-crypt mappings ... * crypt-swap using: -c aes -h sha1 -d /dev/urandom create crypt-swap /dev/ubdb ... [ ok ] * pre_mount: mkswap ${dev} ... [ ok ] [ ok ] * Checking local filesystems ... stable: clean, 93039/122160 files, 318314/488281 blocks [ ok ] * Remounting root filesystem read/write ... -- MfG/Sincerely Toralf Förster pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>