Bug #1350

cpdup core dumps if -pX is specified

Added by sepherosa about 5 years ago. Updated about 5 years ago.

Status:ClosedStart date:
Priority:NormalDue date:
Assignee:-% Done:

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Description

Hi all,

I use following script to dup world building around my boxes:
http://leaf.dragonflybsd.org/~sephe/cpdup_obj.sh

cpdup reproducibly core dumps in the above script. But if '-p10' is
omitted, cpdup will not core dump.

Best Regards,
sephe

History

#1 Updated by dillon about 5 years ago

:Hi all,
:
:I use following script to dup world building around my boxes:
:http://leaf.dragonflybsd.org/~sephe/cpdup_obj.sh
:
:cpdup reproducibly core dumps in the above script. But if '-p10' is
:omitted, cpdup will not core dump.
:
:Best Regards,
:sephe
:
:--
:Live Free or Die

Holy cow it took me a while to track this one down.

libc is not allocating a large enough TCB and the allocation is
getting overflowed. It only applies to static-compiled threaded
programs.

cpdup creates and destroys lots of threads, and cpdup is statically
compiled, so it is pretty much the only program that could possibly
ever actually tickle this bug.

Fix committed!

-Matt
Matthew Dillon
<>

#2 Updated by sepherosa about 5 years ago

fix committed

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