Red Hat Bugzilla – Bug 449909
User Mode Linux (UML) broken on Fedora 9
Last modified: 2008-07-03 23:40:19 EDT
Description of problem:
User Mode Linux (UML) kernels do not start on Fedora 9 anymore.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Download UML kernel from http://user-mode-linux.sourceforge.net/ (no
2. Uncompress the kernel (bunzip2 ...)
3. Make it executable (chmod 755 ...)
4. Start the UML kernel
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
Kernel should not give the error and start
UML mailing list suggests to report this here as it seems to be a ptrace bug in
Fedora 9. See: http://marc.info/?l=user-mode-linux-user&m=121207568609301&w=2
I have not yet found a way to get UML kernels to work and so I cannot really
make use of Fedora 9 because I develop software that requires UML.
I've tried out to rebuild the kernel 2.6.25 without the utrace patch (in Fedora
8, but I'd expect the some behaviour in F9), and UML works fine. Please see my
comment #1 in the associated bug: 450501 .
Fixed in 18.104.22.168-58
kernel-22.214.171.124-76.fc9 has been submitted as an update for Fedora 9
kernel-126.96.36.199-76.fc9 has been pushed to the Fedora 9 testing repository. If problems still persist, please make note of it in this bug report.
If you want to test the update, you can install it with
su -c 'yum --enablerepo=updates-testing update kernel'. You can provide feedback for this update here: http://admin.fedoraproject.org/updates/F9/FEDORA-2008-5893
kernel-188.8.131.52-76.fc9 has been pushed to the Fedora 9 stable repository. If problems still persist, please make note of it in this bug report.