[llvm-dev] [compiler-rt] [tsan] Hanging test

[David Greene via llvm-dev]

I am seeing the compiler-rt tsan test getline_nohang.cc hanging.  Here's
the backtrace:

(gdb) bt
#0  0x00007fb3e26cd13b in __lll_lock_wait_private () from /lib64/libc.so.6
#1  0x00007fb3e264cdc2 in __GI__IO_flush_all () from /lib64/libc.so.6
#2  0x00007fb3e264cebf in _IO_cleanup () from /lib64/libc.so.6
#3  0x00007fb3e260e0eb in __run_exit_handlers () from /lib64/libc.so.6
#4  0x00007fb3e260e185 in exit () from /lib64/libc.so.6
#5  0x00007fb3e25f76ec in __libc_start_main () from /lib64/libc.so.6
#6  0x0000000000420639 in _start () at ../sysdeps/x86_64/start.S:118

So apparently it's waiting on a lock during an I/O flush.  Has anyone
seen this before?

                         -David