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    Subject[bug] uml doesn't boot under 2.6.25-rc1 host (was Re: 2.6.24-mm1 bugs)
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    Date
    > > >  - UML doesn't boot: guest is 2.6.24-mm1 also, haven't tried any
    > > > other. Same guest boots fine on 2.6.24 host.
    > >
    > > What does it do?
    >
    > See below.

    This bug seems to have made it to mainline as well, starting with
    -rc1. Any ideas? Should I start bisecting?

    Thanks,
    Miklos

    >
    > >
    > > Any chance you can bisect it?
    >
    > It would be a bit painful, because this is the only machine I can use.
    > I much prefer bisecting UML kernels :)
    >
    > Thanks,
    > Miklos
    >
    >
    >
    >
    > GNU gdb 6.6.50.20070726-cvs
    > Copyright (C) 2007 Free Software Foundation, Inc.
    > GDB is free software, covered by the GNU General Public License, and you are
    > welcome to change it and/or distribute copies of it under certain conditions.
    > Type "show copying" to see the conditions.
    > There is absolutely no warranty for GDB. Type "show warranty" for details.
    > This GDB was configured as "x86_64-suse-linux"...
    > Using host libthread_db library "/lib64/libthread_db.so.1".
    > (gdb) r umid=uml
    > Starting program: /store/quilt/linux/linux umid=uml
    > 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...nothing mounted on /dev/shm
    > Checking PROT_EXEC mmap in /tmp/...OK
    > Checking for the skas3 patch in the host:
    > - /proc/mm...not found: No such file or directory
    > - PTRACE_FAULTINFO...not found: Invalid argument
    > - PTRACE_LDT...not found: Invalid argument
    > UML running in SKAS0 mode
    > Adding 24977408 bytes to physical memory to account for exec-shield gap
    > [ 0.000000] Linux version 2.6.24-mm1 (mszeredi@tucsk) (gcc version 4.2.1 (SUSE Linux)) #26 Fri Feb 15 11:05:54 CET 2008
    > [ 0.010000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 14179
    > [ 0.010000] Kernel command line: root=98:0
    > [ 0.010000] PID hash table entries: 256 (order: 8, 1024 bytes)
    > [ 0.010000] Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
    > [ 0.010000] Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
    > [ 0.010000] Memory: 29504k available
    > [ 0.270000] Mount-cache hash table entries: 512
    > [ 0.270000] Checking for host processor cmov support...Yes
    > [ 0.270000] Checking that host ptys support output SIGIO...Yes
    > [ 0.270000] Checking that host ptys support SIGIO on close...No, enabling workaround
    > [ 0.270000] net_namespace: 184 bytes
    > [ 0.270000] Using 2.6 host AIO
    > [ 0.270000] NET: Registered protocol family 16
    > [ 0.300000] NET: Registered protocol family 2
    > [ 0.310000] Time: itimer clocksource has been installed.
    > [ 0.390000] IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
    > [ 0.390000] TCP established hash table entries: 2048 (order: 2, 16384 bytes)
    > [ 0.390000] TCP bind hash table entries: 2048 (order: 3, 40960 bytes)
    > [ 0.390000] TCP: Hash tables configured (established 2048 bind 2048)
    > [ 0.390000] TCP reno registered
    > [ 0.420000] Checking host MADV_REMOVE support...<3>MADV_REMOVE failed, err = -38
    > [ 0.420000] Can't release memory to the host - memory hotplug won't be supported
    > [ 0.420000] mconsole (version 2) initialized on /home/mszeredi/.uml/uml/mconsole
    > [ 0.420000] Host TLS support detected
    > [ 0.420000] Detected host type: x86_64 (GDT indexes 12 to 15)
    > [ 0.420000] fuse init (API version 7.9)
    > [ 0.420000] io scheduler noop registered (default)
    > [ 0.420000] loop: module loaded
    > [ 0.420000] TCP cubic registered
    > [ 0.420000] NET: Registered protocol family 1
    > [ 0.420000] Initialized stdio console driver
    > [ 0.420000] Console initialized on /dev/tty0
    > [ 0.420000] console [tty0] enabled
    > [ 0.420000] console [mc-1] enabled
    > [ 0.420000] ubda: unknown partition table
    > [ 0.420000] kjournald starting. Commit interval 5 seconds
    > [ 0.420000] EXT3-fs: mounted filesystem with ordered data mode.
    > [ 0.420000] VFS: Mounted root (ext3 filesystem) readonly.
    > [ 0.420000] Failed to get registers from stub, errno = 3
    > [ 0.420000] wait_stub_done : failed to wait for SIGTRAP, pid = 30073, n = 30073, errno = 0, status = 0x0
    > [New LWP 30070]
    > [New LWP 30071]
    > [New LWP 30072]
    >
    > Program received signal SIGTERM, Terminated.
    > 0xffffe430 in __kernel_vsyscall ()
    > (gdb) bt
    > #0 0xffffe430 in __kernel_vsyscall ()
    > #1 0xf7eabc26 in kill () from /lib/libc.so.6
    > #2 0x0806cf82 in os_dump_core () at arch/um/os-Linux/util.c:105
    > #3 0x0805d64d in fatal_sigsegv () at arch/um/kernel/trap.c:141
    > #4 0x0806e32b in wait_stub_done (pid=30073)
    > at arch/um/os-Linux/skas/process.c:94
    > #5 0x0806d94b in run_syscall_stub (mm_idp=0xb26ff18, syscall=123,
    > args=0xb067e08, expected=0, addr=0xb067ea4, done=1)
    > at arch/um/os-Linux/skas/mem.c:86
    > #6 0x0806f997 in write_ldt_entry (mm_idp=0xb26ff18, func=1, desc=0xb067e94,
    > addr=0xb067ea4, done=1) at arch/um/sys-i386/ldt.c:72
    > #7 0x08070434 in init_new_ldt (new_mm=0xb26ff18, from_mm=0x0)
    > at arch/um/sys-i386/ldt.c:425
    > #8 0x0805de43 in init_new_context (task=0xb05bc00, mm=0xb26fdc0)
    > at arch/um/kernel/skas/mmu.c:87
    > #9 0x080ce3c1 in bprm_mm_init (bprm=0xb1a6980) at fs/exec.c:337
    > #10 0x080cfa2d in do_execve (filename=0x820d61f "/sbin/init", argv=0x8250020,
    > envp=0x8250240, regs=0xb05be04) at fs/exec.c:1296
    > #11 0x080599e8 in execve1 (file=0x820d61f "/sbin/init", argv=0x8250020,
    > env=0x8250240) at arch/um/kernel/exec.c:62
    > #12 0x08059a4f in um_execve (file=0x820d61f "/sbin/init", argv=0x8250020,
    > env=0x8250240) at arch/um/kernel/exec.c:78
    > #13 0x0805c4fb in kernel_execve (filename=0x820d61f "/sbin/init",
    > ---Type <return> to continue, or q <return> to quit---
    > argv=0x8250020, envp=0x8250240) at arch/um/kernel/syscall.c:146
    > #14 0x08059616 in run_init_process (init_filename=0x820d61f "/sbin/init")
    > at init/main.c:763
    > #15 0x080596d3 in init_post () at init/main.c:809
    > #16 0x08049a74 in kernel_init (unused=0x0) at init/main.c:865
    > #17 0x0806ac31 in run_kernel_thread (fn=0x8049a00 <kernel_init>, arg=0x0,
    > jmp_ptr=0xb05be70) at arch/um/os-Linux/process.c:267
    > #18 0x0805ad62 in new_thread_handler () at arch/um/kernel/process.c:153
    > #19 0x00000000 in ?? ()
    > (gdb)
    >


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