https://bugs.kde.org/show_bug.cgi?id=475650
Bug ID: 475650
Summary: DRD does not work with C11 threads
Classification: Developer tools
Product: valgrind
Version: unspecified
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: drd
Assignee: bart.vanassche+...@gmail.com
Reporter: weilercd...@gmail.com
Target Milestone: ---
SUMMARY
DRD does not appear to support C11 threads.
STEPS TO REPRODUCE
Just create a thread in C with `thrd_create`
OBSERVED RESULT
==2451066== Process terminating with default action of signal 11 (SIGSEGV):
dumping core
==2451066== Access not within mapped region at address 0x7
==2451066== at 0x4934634: pthread_attr_getdetachstate
(pthread_attr_getdetachstate.c:29)
==2451066== by 0x484ED7D: pthread_create_intercept
(drd_pthread_intercepts.c:609)
==2451066== by 0x484ED7D: pthread_create@* (drd_pthread_intercepts.c:640)
==2451066== by 0x493F689: thrd_create@@GLIBC_2.34 (thrd_create.c:28)
EXPECTED RESULT
Should not crash
ADDITIONAL INFORMATION
I did some digging and it appears glibcs ntpl implements thrd_create by calling
__pthread_create with an attr of ATTR_C11_THREAD which is just a macro for
((void*)(uintptr_t)-1). Since this is not a null pointer, the check inside
DRD's pthread_create_intercept succeeds then calls pthread_attr_getdetachstate
with ((void*)(uintptr_t)-1) as the address of a valid attr struct.
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