Bug 143350 - ptrace horked in 2.6.9-1.1047_FC4smp
ptrace horked in 2.6.9-1.1047_FC4smp
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Roland McGrath
Brian Brock
Depends On:
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Reported: 2004-12-19 16:16 EST by Ulrich Drepper
Modified: 2007-11-30 17:10 EST (History)
3 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2005-01-04 16:00:01 EST
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Description Ulrich Drepper 2004-12-19 16:16:16 EST
Description of problem:
ptrace() seems to be completely broken in 2.6.9-1.1047_FC4smp.

$ strace /bin/echo
execve("/bin/echo", ["/bin/echo"], [/* 39 vars */]) = 0

... and then it's stuck.  The process has to be aborted.  gdb shows the same

Version-Release number of selected component (if applicable):

How reproducible:
I haven't rebooted and don't know whether this has been the case ever since the
last boot, but it surely is 100% reproducible now.

Steps to Reproduce:
1.boot said kernel
2.strace /bin/echo
Actual results:
Nothing except the fake execve message

Expected results:

Additional info:
strace-4.5.8-1.x86_64 is used, but this shouldn't matter since gdb is also
affected and both programs worked before.
Comment 1 Ulrich Drepper 2004-12-19 21:37:47 EST
This happens on x86 as well.  So not x86-64 specific.
Comment 2 Roland McGrath 2004-12-20 17:34:07 EST
This is ok in the upstream kernel and in the RHEL4 kernel.
So it's just some sort of merging snafu or whatnot in the FC4 kernel.
I didn't see anything obvious.  I'm not going to worry about this since I figure
bleeding edge FC should be rebasing to 2.6.10(rc*) soon enough anyway.
Comment 3 Michal Jaegermann 2004-12-23 18:48:03 EST
This got corrected a bit but in 2.6.9-1.1049_FC4 but not that much.
'strace echo' just prints, at least on x86_64,

execve("/bin/echo", ["echo"], [/* 24 vars */]) = 0

and returns.  I would expect to see some 38 lines of output.
Comment 4 Dave Jones 2005-01-04 12:47:51 EST
theres a 2.6.10 based update in rawhide now, can you test that please ?
Comment 5 Ulrich Drepper 2005-01-04 16:00:01 EST
Seems to work again in 2.6.10-based kernels.  I've only tested x86 so far, but
since the symptoms were identical this should apply to other archs as well.

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