Dear Amerigo, Russell and user-mode linux developers, I have seen the thread on the web and I've just joined the ML. Russell Lewis asked about nesting. http://www.mail-archive.com/user-mode-linux-devel@lists.sourceforge.net/msg06422.html
I am the one who posted: http://groups.google.com/group/linux.kernel/browse_thread/thread/bacb6633e87708d9 When I made the tests with 2.6.28.2 it worked but now I am having Russell's very same problem on the nested execution. Eeek! page_mapcount(page) went negative! (-1) Then the entire outer uml crashes. I have spent the entire day yesterday trying to figure out what has changed since the beginning of February when it worked. On 2.6.29-rc7 I get a different error (the Eeek error has been eliminated from the kernel source code): the output of the nested execution is at the end of this message. The nested UML crashes anyway, but the calling UML does not panic. There are also new problems. During the boot of uml (the first one) I get a lot of warnings like: IRQ nn/xxxx: IRQF_DISABLED is not guaranteed on shared IRQs VDE networking does not work. On the switch I can see the port assigned to uml but ping is mute. I suppose that other services/devices involved with the shared IRQ problem are not working properly. Any idea on both problems? renzo *********************BOOT OF THE FIRST (OUTER) UML ********************************** $ /tmp/linux.uml mem=256M ubd0=cow eth0=vde Locating the bottom of the address space ... 0x0 Locating the top of the address space ... 0xc0000000 Core dump limits : soft - 0 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 Linux version 2.6.29-rc7 (re...@picione) (gcc version 4.3.2 (Debian 4.3.2-1) ) #4 Sat Mar 7 18:09:15 CET 2009 Built 1 zonelists in Zone order, mobility grouping on. Total pages: 65024 Kernel command line: mem=256M ubd0=cow eth0=vde root=98:0 PID hash table entries: 1024 (order: 10, 4096 bytes) Dentry cache hash table entries: 32768 (order: 5, 131072 bytes) Inode-cache hash table entries: 16384 (order: 4, 65536 bytes) Memory: 255616k available Calibrating delay loop... 4784.12 BogoMIPS (lpj=23920640) 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 net_namespace: 520 bytes Using 2.6 host AIO NET: Registered protocol family 16 bio: create slab <bio-0> at 0 NET: Registered protocol family 2 IP route cache hash table entries: 2048 (order: 1, 8192 bytes) 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 NET: Registered protocol family 1 IRQ 9/mconsole: IRQF_DISABLED is not guaranteed on shared IRQs mconsole (version 2) initialized on /home/renzo/.uml/6iBHgI/mconsole Checking host MADV_REMOVE support...OK Host TLS support detected Detected host type: i386 (GDT indexes 6 to 9) VFS: Disk quotas dquot_6.5.2 Dquot-cache hash table entries: 1024 (order 0, 4096 bytes) msgmni has been set to 499 io scheduler noop registered io scheduler anticipatory registered (default) io scheduler deadline registered io scheduler cfq registered TCP cubic registered NET: Registered protocol family 17 Initialized stdio console driver Console initialized on /dev/tty0 console [tty0] enabled Initializing software serial port version 1 Configured vde device: (default socket) Choosing a random ethernet address for device eth0 Netdevice 0 (62:35:de:de:a7:a6) : vde backend - (default socket), undefined port vde backend - connection opened eth0 (uml-netdev): not using net_device_ops yet console [mc-1] enabled ubda: unknown partition table EXT3-fs: INFO: recovery required on readonly filesystem. EXT3-fs: write access will be enabled during recovery. kjournald starting. Commit interval 5 seconds EXT3-fs: recovery complete. EXT3-fs: mounted filesystem with ordered data mode. VFS: Mounted root (ext3 filesystem) readonly on device 98:0. IRQ 3/console-write: IRQF_DISABLED is not guaranteed on shared IRQs IRQ 2/console: IRQF_DISABLED is not guaranteed on shared IRQs IRQ 10/winch: IRQF_DISABLED is not guaranteed on shared IRQs Mount failed for selinuxfs on /selinux: No such file or directory IRQ 10/winch: IRQF_DISABLED is not guaranteed on shared IRQs IRQ 10/winch: IRQF_DISABLED is not guaranteed on shared IRQs INIT: IRQ 10/winch: IRQF_DISABLED is not guaranteed on shared IRQs version 2.86 bootingIRQ 10/winch: IRQF_DISABLED is not guaranteed on shared IRQs IRQ 10/winch: IRQF_DISABLED is not guaranteed on shared IRQs hostname: the specified hostname is invalid line_ioctl: tty0: unknown ioctl: 0x541e line_ioctl: tty0: unknown ioctl: 0x5603 Setting the system clock. modprobe: FATAL: Could not load /lib/modules/2.6.29-rc7/modules.dep: No such file or directory hwclock is unable to get I/O port access: the iopl(3) call failed. * Unable to set System Clock to: Sat Mar 7 18:16:27 UTC 2009 findfs: Unable to resolve 'LABEL=ROOT' Activating swap:. Usage: mountpoint [-q] [-d] [-x] path Will now check root file system:fsck 1.41.0 (10-Jul-2008) [/sbin/fsck.ext3 (1) -- /lib/init/rw/rootdev] fsck.ext3 -a -C0 /lib/init/rw/rootdev /lib/init/rw/rootdev: clean, 15400/131072 files, 94572/262144 blocks (check in 2 mounts) . EXT3 FS on ubda, internal journal Setting the system clock. modprobe: FATAL: Could not load /lib/modules/2.6.29-rc7/modules.dep: No such file or directory hwclock is unable to get I/O port access: the iopl(3) call failed. * Unable to set System Clock to: Sat Mar 7 18:16:28 UTC 2009 Cleaning up ifupdown.... FATAL: Could not load /lib/modules/2.6.29-rc7/modules.dep: No such file or directory Loading device-mapper support. Will now check all file systems. fsck 1.41.0 (10-Jul-2008) Checking all file systems. Done checking file systems. A log is being saved in /var/log/fsck/checkfs if that location is writable. Setting kernel variables...done. Will now mount local filesystems:mount: none already mounted or /dev/pts busy mount: according to mtab, devpts is already mounted on /dev/pts failed! Will now activate swapfile swap:done. Cleaning /tmp...done. Cleaning /var/run...done. Cleaning /var/lock...done. Checking minimum space in /tmp...done. Running 0dns-down to make sure resolv.conf is ok...done. Setting up networking.... * /etc/network/options still exists and it will be IGNORED! Read README.Debian of netbase. Configuring network interfaces...done. Setting console screen modes and fonts. line_ioctl: tty0: unknown ioctl: 0x541e line_ioctl: tty0: unknown ioctl: 0x5603 Initializing random number generator...done. Recovering nvi editor sessions...none found. IRQ 10/winch: IRQF_DISABLED is not guaranteed on shared IRQs INIT: IRQ 10/winch: IRQF_DISABLED is not guaranteed on shared IRQs Entering runlevel: 2IRQ 10/winch: IRQF_DISABLED is not guaranteed on shared IRQs IRQ 10/winch: IRQF_DISABLED is not guaranteed on shared IRQs Starting system log daemon.... Starting kernel log daemon.... Starting MTA: exim4. * ALERT: exim paniclog /var/log/exim4/paniclog has non-zero size, mail system possibly broken * Not starting internet superserver: no services enabled. Starting deferred execution scheduler: atd. Starting periodic command scheduler: crond. Running local boot scripts (/etc/rc.local). IRQ 10/winch: IRQF_DISABLED is not guaranteed on shared IRQs Serial line 0 assigned device '/dev/pts/43' IRQ 6/ssl: IRQF_DISABLED is not guaranteed on shared IRQs IRQ 7/ssl-write: IRQF_DISABLED is not guaranteed on shared IRQs Debian GNU/Linux lenny/sid (none) tty0 (none) login: root Password: Last login: Sat Mar 7 18:09:46 UTC 2009 on tty0 Linux (none) 2.6.29-rc7 #4 Sat Mar 7 18:09:15 CET 2009 i686 The programs included with the Debian GNU/Linux system are free software; the exact distribution terms for each program are described in the individual files in /usr/share/doc/*/copyright. Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law. (none):~# uname -a Linux (none) 2.6.29-rc7 #4 Sat Mar 7 18:09:15 CET 2009 i686 GNU/Linux (none):~# mount -t hostfs / /mnt ********************************BOOT OF THE NESTED UML*************************************** (none):~# /mnt/tmp/linux.uml ubd0=/mnt/home/renzo/tests/linux.img Locating the bottom of the address space ... 0x0 Locating the top of the address space ... 0xc0000000 Core dump limits : soft - 0 hard - NONE Checking that ptrace can change system call numbers...OK Checking syscall emulation patch for ptrace...missing 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...found - PTRACE_LDT...not found UML running in SKAS0 mode Linux version 2.6.29-rc7 (re...@picione) (gcc version 4.3.2 (Debian 4.3.2-1) ) #4 Sat Mar 7 18:09:15 CET 2009 Built 1 zonelists in Zone order, mobility grouping on. Total pages: 8128 Kernel command line: ubd0=/mnt/home/renzo/tests/linux.img root=98:0 PID hash table entries: 128 (order: 7, 512 bytes) Dentry cache hash table entries: 4096 (order: 2, 16384 bytes) Inode-cache hash table entries: 2048 (order: 1, 8192 bytes) Memory: 30312k available Calibrating delay loop... 18874.36 BogoMIPS (lpj=94371840) 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 net_namespace: 520 bytes Using 2.6 host AIO NET: Registered protocol family 16 bio: create slab <bio-0> at 0 NET: Registered protocol family 2 IP route cache hash table entries: 1024 (order: 0, 4096 bytes) TCP established hash table entries: 1024 (order: 1, 8192 bytes) TCP bind hash table entries: 1024 (order: 0, 4096 bytes) TCP: Hash tables configured (established 1024 bind 1024) TCP reno registered NET: Registered protocol family 1 IRQ 9/mconsole: IRQF_DISABLED is not guaranteed on shared IRQs mconsole (version 2) initialized on /root/.uml/C7XqUl/mconsole Checking host MADV_REMOVE support...OK Host TLS support detected Detected host type: i386 (GDT indexes 6 to 9) VFS: Disk quotas dquot_6.5.2 Dquot-cache hash table entries: 1024 (order 0, 4096 bytes) msgmni has been set to 59 io scheduler noop registered io scheduler anticipatory registered (default) io scheduler deadline registered io scheduler cfq registered TCP cubic registered NET: Registered protocol family 17 Initialized stdio console driver Console initialized on /dev/tty0 console [tty0] enabled Initializing software serial port version 1 console [mc-1] enabled ubda: VFS: Mounted root (ext2 filesystem) readonly on device 98:0. IRQ 3/console-write: IRQF_DISABLED is not guaranteed on shared IRQs IRQ 2/console: IRQF_DISABLED is not guaranteed on shared IRQs IRQ 10/winch: IRQF_DISABLED is not guaranteed on shared IRQs BUG: Bad page map in process linux.uml pte:00139045 pmd:0f8aa1e1 page:08a06720 flags:00000400 count:1 mapcount:-1 mapping:(null) index:0 addr:00100000 vm_flags:00060055 anon_vma:(null) mapping:(null) index:100 vma->vm_ops->fault: special_mapping_fault+0x0/0x47 1793fd64: [<0817e79a>] dump_stack+0x1c/0x20 1793fd7c: [<080a0def>] print_bad_pte+0x16d/0x17d 1793fdac: [<080a16d0>] unmap_vmas+0x273/0x46f 1793fe04: [<080a4719>] unmap_region+0x82/0xfe 1793fe3c: [<080a5361>] do_munmap+0x1f6/0x245 1793fe6c: [<080a5bc8>] mmap_region+0xc4/0x3fd 1793feb8: [<080a610b>] do_mmap_pgoff+0x20a/0x253 1793fef0: [<080589d7>] sys_mmap2+0x60/0x8e 1793ff28: [<08059f83>] handle_syscall+0x7b/0x98 1793ff78: [<08068d54>] userspace+0x2ca/0x371 1793ffe0: [<08057d4e>] fork_handler+0x53/0x5b 1793fffc: [<00000000>] 0x0 BUG: Bad page state in process linux.uml pfn:00139 page:08a06720 flags:00000400 count:0 mapcount:-1 mapping:(null) index:0 1793fd14: [<0817e79a>] dump_stack+0x1c/0x20 1793fd2c: [<08096ce5>] bad_page+0xd1/0xe8 1793fd60: [<08097397>] free_hot_cold_page+0xa1/0x15d 1793fd7c: [<08097498>] free_hot_page+0xd/0xf 1793fd84: [<08099d94>] put_page+0xe1/0xea 1793fd9c: [<080a9599>] free_page_and_swap_cache+0x32/0x38 1793fdac: [<080a16e1>] unmap_vmas+0x284/0x46f 1793fe04: [<080a4719>] unmap_region+0x82/0xfe 1793fe3c: [<080a5361>] do_munmap+0x1f6/0x245 1793fe6c: [<080a5bc8>] mmap_region+0xc4/0x3fd 1793feb8: [<080a610b>] do_mmap_pgoff+0x20a/0x253 1793fef0: [<080589d7>] sys_mmap2+0x60/0x8e 1793ff28: [<08059f83>] handle_syscall+0x7b/0x98 1793ff78: [<08068d54>] userspace+0x2ca/0x371 1793ffe0: [<08057d4e>] fork_handler+0x53/0x5b 1793fffc: [<00000000>] 0x0 BUG: Bad page map in process linux.uml pte:0f948045 pmd:0f8aa1e1 page:08bf6900 flags:(null) count:1 mapcount:-1 mapping:(null) index:0 addr:00101000 vm_flags:00060055 anon_vma:(null) mapping:(null) index:101 vma->vm_ops->fault: special_mapping_fault+0x0/0x47 1793fd64: [<0817e79a>] dump_stack+0x1c/0x20 1793fd7c: [<080a0def>] print_bad_pte+0x16d/0x17d 1793fdac: [<080a16d0>] unmap_vmas+0x273/0x46f 1793fe04: [<080a4719>] unmap_region+0x82/0xfe 1793fe3c: [<080a5361>] do_munmap+0x1f6/0x245 1793fe6c: [<080a5bc8>] mmap_region+0xc4/0x3fd 1793feb8: [<080a610b>] do_mmap_pgoff+0x20a/0x253 1793fef0: [<080589d7>] sys_mmap2+0x60/0x8e 1793ff28: [<08059f83>] handle_syscall+0x7b/0x98 1793ff78: [<08068d54>] userspace+0x2ca/0x371 1793ffe0: [<08057d4e>] fork_handler+0x53/0x5b 1793fffc: [<00000000>] 0x0 BUG: Bad page state in process linux.uml pfn:0f948 page:08bf6900 flags:(null) count:0 mapcount:-1 mapping:(null) index:0 1793fd14: [<0817e79a>] dump_stack+0x1c/0x20 1793fd2c: [<08096ce5>] bad_page+0xd1/0xe8 1793fd60: [<08097397>] free_hot_cold_page+0xa1/0x15d 1793fd7c: [<08097498>] free_hot_page+0xd/0xf 1793fd84: [<08099d94>] put_page+0xe1/0xea 1793fd9c: [<080a9599>] free_page_and_swap_cache+0x32/0x38 1793fdac: [<080a16e1>] unmap_vmas+0x284/0x46f 1793fe04: [<080a4719>] unmap_region+0x82/0xfe 1793fe3c: [<080a5361>] do_munmap+0x1f6/0x245 1793fe6c: [<080a5bc8>] mmap_region+0xc4/0x3fd 1793feb8: [<080a610b>] do_mmap_pgoff+0x20a/0x253 1793fef0: [<080589d7>] sys_mmap2+0x60/0x8e 1793ff28: [<08059f83>] handle_syscall+0x7b/0x98 1793ff78: [<08068d54>] userspace+0x2ca/0x371 1793ffe0: [<08057d4e>] fork_handler+0x53/0x5b 1793fffc: [<00000000>] 0x0 Kernel panic - not syncing: Attempted to kill init! EIP: 0073:[<40001696>] CPU: 0 Not tainted ESP: 007b:bfa9e180 EFLAGS: 00010286 Not tainted EAX: 00008000 EBX: 00000000 ECX: 00000000 EDX: 00000000 ESI: 00000000 EDI: 00000000 EBP: 00000000 DS: 007b ES: 007b 09c5bd7c: [<0806b5f1>] show_regs+0xc4/0xcb 09c5bda8: [<08059b1a>] panic_exit+0x25/0x3b 09c5bdbc: [<08085077>] notifier_call_chain+0x27/0x4c 09c5bde4: [<080850ca>] atomic_notifier_call_chain+0x15/0x17 09c5bdf4: [<0817e7ea>] panic+0x4c/0xd2 09c5be10: [<0807489c>] do_exit+0x66/0x634 09c5be5c: [<08074ec7>] do_group_exit+0x5d/0x89 09c5be78: [<0807cad9>] get_signal_to_deliver+0x28d/0x2a4 09c5bea4: [<08058610>] do_signal+0x203/0x2e3 09c5bf78: [<08057cf9>] interrupt_end+0x37/0x39 09c5bf84: [<08068dec>] userspace+0x362/0x371 09c5bfe8: [<08057dd1>] new_thread_handler+0x7b/0x87 09c5bffc: [<00000000>] 0x0 Segmentation fault (none):~# ------------------------------------------------------------------------------ Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
