*** Error in `./perf-prof': double free or corruption (!prev): 0x0000000001691040 *** (gdb) bt #0 0x00007fc6f717d3a7 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:55 #1 0x00007fc6f717ea98 in __GI_abort () at abort.c:90 #2 0x00007fc6f71bfef7 in __libc_message (do_abort=do_abort@entry=2, fmt=fmt@entry=0x7fc6f72d2418 "*** Error in `%s': %s: 0x%s ***\n") at ../sysdeps/unix/sysv/linux/libc_fatal.c:196 #3 0x00007fc6f71c86e9 in malloc_printerr (ar_ptr=0x7fc6f750f760 <main_arena>, ptr=<optimized out>, str=0x7fc6f72d2540 "double free or corruption (!prev)", action=3) at malloc.c:4967 #4 _int_free (av=0x7fc6f750f760 <main_arena>, p=<optimized out>, have_lock=0) at malloc.c:3843 #5 0x000000000041b3bb in perf_timespec_init (dev=dev@entry=0x169cec0) at convert.c:375 #6 0x0000000000412cc4 in prof_dev_enable (dev=dev@entry=0x169cec0) at monitor.c:1820 (gdb) f 5 #5 0x000000000041b3bb in perf_timespec_init (dev=dev@entry=0x169cec0) at convert.c:375 (gdb) info locals evlist = <optimized out> map = <optimized out> tidmap = 0x16686b0 e = 0x1691040 ==> double free evt = 0x0 When prof_dev_open_cpu_thread_map() returns NULL, env has been freed. Signed-off-by: duanery <corcpp@foxmail.com>

please add build doc #4

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