_L_lock_791() when printf() called

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#0  __lll_lock_wait_private () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:97
#1  0x00007f8bbbc215e0 in _L_lock_791 () from /lib64/libc.so.6
#2  0x00007f8bbbc1bf60 in _IO_vfprintf_internal (s=0x7f8bbbf67040, format=0xcc3ae8 "send wrapper data: gate_sid=%d,uclient_sid=%d,cmd_type=%d\n", ap=0x7f8bb69b8950) at vfprintf.c:1325
#3  0x00007f8bbbc26ffa in __printf (format=<value optimized out>) at printf.c:35

My program has a coredump at runtime, which I found was caused by calling the printf() library function. And I don't understand the implementation of the printf() function. What is the cause of this?

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