https://bugs.kde.org/show_bug.cgi?id=386427
Bug ID: 386427
Summary: Valgrind unsupported clone on Android
Product: valgrind
Version: unspecified
Platform: Android
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: tamara.vlaho...@imgtec.com
Target Milestone: ---
When program crashes from one of following signals: SIGILL, SIGABRT, SIGBUS,
SIGFPE, SIGSEGV,SIGSTKFLT, SIGPIPE, on Android, debuggerd handler is called to
handle it. Inside that handler clone is called with following flags:
CLONE_THREAD, CLONE_SIGHAND, CLONE_VM, CLONE_CHILD_SETTID,
CLONE_CHILD_CLEARTID.
When such program is run under Valgrind, Valgrind will report that such clone
isn't supported, as Valgrind supports only NPTL clone, vfork and fork. To check
for a clone kind Valgrind checks for VKI_CLONE_VM, VKI_CLONE_FS, CLONE_FILES,
CLONE_VFORK flags. This allows for clone with set CLONE_VM, CLONE_FS,
CLONE_FILES, and without set CLONE_THREAD, to pass as a clone which creates new
thread, which isn't the case.
On the other hand there is no problem in allowing program to clone a thread
without CLONE_FS flag set.
As for the missing CLONE_FILES, problem only occurs when Valgrind is run with
--track-fds=yes option. Patch in next comment should fix this.
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