UML does not manage to start up and exits with the error:
    Checking advanced syscall emulation patch for ptrace...check_ptrace
: expected SIGTRAP or (SIGTRAP | 0x80), got status = 256

I performed as said the following commands:

$ wget -q http://uml.nagafix.co.uk/FedoraCore5/FedoraCore5-x86-root_fs.bz2
$ wget -q http://user-mode-linux.sourceforge.net/linux-2.6.24-rc7.bz2
$ bunzip2 FedoraCore5-x86-root_fs.bz2
$ bunzip2 linux-2.6.24-rc7.bz2
$ chmod +x linux-2.6.24-rc7.bz2
$ ./linux-2.6.24-rc7 ubda=FedoraCore5-x86-root_fs mem=128M stderr=1
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...check_ptrace :
expected SIGTRAP or (SIGTRAP | 0x80), got status = 256

System:
Linux localhost.localdomain 2.6.25.3-18.fc9.i686 #1 SMP Tue May 13
05:38:53 EDT 2008 i686 i686 i386 GNU/Linux

$ rpm -q gcc
gcc-4.3.0-8.i386

$ rpm -q glibc
glibc-2.8-3.i686


I know I had tried it earlier (a certain number of months ago) but it
did work... But it seems that it does not work


Same thing with: kernel32-2.6.25.bz2 from http://uml.nagafix.co.uk/kernels/.


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