Red Hat Bugzilla – Bug 198518
i386: vDSO unsupported, enabling it causes panic
Last modified: 2013-03-06 00:59:47 EST
Description of problem:
vDSO works on x86_64, but on i386, the kernel panics if you
try to enable the support.
Version-Release number of selected component (if applicable):
sysctl -w kernel.vdso=1
Steps to Reproduce:
1. sysctl -w kernel.vdso=1
2. or boot with "vdso=1" on the kernel boot line
panic. traceback not currently available, but the feature
is not yet supported on i386; please update if you need
the full panic message.
vDSO support as seen in FC6.
Seen in testing binutils (2006:0489), which should now support vDSO
and does on x86_64.
Quick test to see if the feature is turned on is
ldd /bin/true | grep linux-gate
this would require a fair amount of backports and testing...i'd suggest we close
this wouldn't fix for rhel4, unless there is a customer dying to have
this...John, why do you need this? for rhts testing?
Jason, I'm not necessarily the right person to ask for that :)
It's evidently used by binutils, and the binutils maintainer(s)
should best be able to explain what they're using it for.
I just ran across it while trying the features in a binutils
rhel4 binaries should continue to work properly without this kernel feature even
if they are not optimal...i'd suggest we close this wouldn't fix unless i'm