Valgrind warning with the last incoming repo

[jeremyletang]

Hi,

I have a strange message with the latest version of the compiler from the incoming repo. This message is provided by valgrind with only a simple main.

This is the message :

Warning: client switching stacks?  SP change: 0x7fefff9e0 --> 0x7fedca738
==17001==          to suppress, use: --max-stackframe=2314920 or greater
==17001== Syscall param read(buf) points to unaddressable byte(s)
==17001==    at 0x4018877: read (syscall-template.S:81)
==17001==    by 0x4005FDC: open_verify (dl-load.c:2093)
==17001==    by 0x4006406: open_path (dl-load.c:2210)
==17001==    by 0x4008E88: _dl_map_object (dl-load.c:2418)
==17001==    by 0x400CD61: openaux (dl-deps.c:63)
==17001==    by 0x400F705: _dl_catch_error (dl-error.c:177)
==17001==    by 0x400D438: _dl_map_object_deps (dl-deps.c:256)
==17001==    by 0x40036AA: dl_main (rtld.c:1744)
==17001==    by 0x401678D: _dl_sysdep_start (dl-sysdep.c:241)
==17001==    by 0x4005227: _dl_start (rtld.c:337)
==17001==    by 0x4001657: ??? (in /lib/x86_64-linux-gnu/ld-2.17.so)
==17001==  Address 0x7fedca750 is on thread 1's stack
==17001== 
==17001== Warning: client switching stacks?  SP change: 0x7fedca740 --> 0x7fefffa18
==17001==          to suppress, use: --max-stackframe=2314968 or greater

I just compile the program like this :

> rustc main.rs

And i use no flag with valgrind.

[Aatch]

Rust uses green threads, so we do switch stacks. This is expected behaviour.

There is a suppression file in src/etc if you wish to turn it off.