Hi, i downloaded linux 2.6.31 version and compiled for ARCH=um SUBARCH=i386 ( 32bit uml)
my linux machine (64bit ubunt lucid ) gcc version is (Ubuntu 4.4.3-4ubuntu5) 4.4.3 root@dasaradham-laptop:/home/fox/workout/torvalds-linux-a271b16# ./linux ubda=/media/Mars/ubuntu/ubuntu-ext3-2gb-root.fs mem=128M Locating the bottom of the address space ... 0x0 Locating the top of the address space ... 0xffffd000 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 Adding 5664768 bytes to physical memory to account for exec-shield gap Aborted i did a gdb to get a back trace root@dasaradham-laptop:/home/fox/workout/torvalds-linux-a271b16# gdb ./linux core GNU gdb (GDB) 7.1-ubuntu Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /home/fox/workout/torvalds-linux-a271b16/linux...bdone. [New Thread 2174] warning: Can't read pathname for load map: Input/output error. Reading symbols from /lib32/libutil.so.1...(no debugging symbols found)...done. Loaded symbols for /lib32/libutil.so.1 Reading symbols from /lib32/libc.so.6...(no debugging symbols found)...done. Loaded symbols for /lib32/libc.so.6 Reading symbols from /lib/ld-linux.so.2... warning: the debug information found in "/lib/ld-2.11.1.so" does not match "/lib/ld-linux.so.2" (CRC mismatch). (no debugging symbols found)...done. Loaded symbols for /lib/ld-linux.so.2 Core was generated by `./linux ubda=/media/Mars/ubuntu/ubuntu-ext3-2gb-root.fs mem=128M'. Program terminated with signal 6, Aborted. #0 0xf7760430 in __kernel_vsyscall () (gdb) bt #0 0xf7760430 in __kernel_vsyscall () #1 0xf760a921 in raise () from /lib32/libc.so.6 #2 0xf760dd52 in abort () from /lib32/libc.so.6 #3 0x0806ff2d in os_dump_core () at arch/um/os-Linux/util.c:119 #4 0x0805efe9 in panic_exit (self=0x8280288, unused1=0, unused2=0x8295780) at arch/um/kernel/um_arch.c:233 #5 0x080983dc in notifier_call_chain (nl=<value optimized out>, val=<value optimized out>, v=0x87e, nr_to_call=-1, nr_calls=0x0) at kernel/notifier.c:93 #6 0x08098453 in __atomic_notifier_call_chain (nh=0x8295740, val=0, v=0x8295780) at kernel/notifier.c:182 #7 atomic_notifier_call_chain (nh=0x8295740, val=0, v=0x8295780) at kernel/notifier.c:191 #8 0x08211d07 in panic (fmt=0x8242b3f "Kernel mode signal %d") at kernel/panic.c:91 #9 0x0805e7b7 in relay_signal (sig=4, regs=0x827e4f0) at arch/um/kernel/trap.c:228 #10 0x0806ebd4 in sig_handler_common (sig=4, sc=0x827e5a4) at arch/um/os-Linux/signal.c:49 #11 0x0806edaa in sig_handler (sig=0, sc=0x827e5a4) at arch/um/os-Linux/signal.c:226 #12 0x0806efec in handle_signal (sig=2174, sc=0x827e5a4) at arch/um/os-Linux/signal.c:158 ---Type <return> to continue, or q <return> to quit--- #13 0x08071298 in hard_handler (sig=4) at arch/um/os-Linux/sys-i386/signal.c:12 #14 <signal handler called> #15 run_posix_cpu_timers (tsk=0x827f600) at kernel/posix-cpu-timers.c:1389 #16 0x0808964d in update_process_times (user_tick=0) at kernel/timer.c:1163 #17 0x0809e741 in tick_periodic (cpu=<value optimized out>) at kernel/time/tick-common.c:72 #18 0x0809e7b1 in tick_handle_periodic (dev=0x82801a0) at kernel/time/tick-common.c:84 #19 0x0805d9c3 in um_timer (irq=0, dev=0x0) at arch/um/kernel/time.c:63 #20 0x080a979d in handle_IRQ_event (irq=0, action=0x10c4ab60) at kernel/irq/handle.c:376 #21 0x080a989e in __do_IRQ (irq=0) at kernel/irq/handle.c:518 #22 0x0805b675 in do_IRQ (irq=0, regs=0x827e9b8) at arch/um/kernel/irq.c:335 #23 0x0805da86 in timer_handler (sig=26, regs=0x827e9b8) at arch/um/kernel/time.c:21 #24 0x0806ece6 in real_alarm_handler (sc=<value optimized out>) at arch/um/os-Linux/signal.c:94 #25 0x0806ed62 in alarm_handler (sig=26, sc=0x827ea64) at arch/um/os-Linux/signal.c:226 #26 0x0806efec in handle_signal (sig=5, sc=0x827ea64) at arch/um/os-Linux/signal.c:158 #27 0x08071298 in hard_handler (sig=26) at arch/um/os-Linux/sys-i386/signal.c:12 ---Type <return> to continue, or q <return> to quit--- #28 <signal handler called> #29 calibrate_delay () at init/calibrate.c:146 #30 0x080495f4 in start_kernel () at init/main.c:685 #31 0x0804aac8 in start_kernel_proc (unused=0x0) at arch/um/kernel/skas/process.c:46 #32 0x0806d84e in run_kernel_thread (fn=0x804aa9a <start_kernel_proc>, arg=0x0, jmp_ptr=0x827f878) at arch/um/os-Linux/process.c:267 #33 0x0805c60e in new_thread_handler () at arch/um/kernel/process.c:151 #34 0x00000000 in ?? 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