xiaolin310 commented on issue #1825:
URL: 
https://github.com/apache/incubator-brpc/issues/1825#issuecomment-1169624329

   ```
   Crashed Thread:        0  Dispatch queue: com.apple.main-thread
   
   Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
   Exception Codes:       KERN_INVALID_ADDRESS at 0x0000000000000068
   Exception Note:        EXC_CORPSE_NOTIFY
   
   Termination Signal:    Segmentation fault: 11
   Termination Reason:    Namespace SIGNAL, Code 0xb
   Terminating Process:   exc handler [61876]
   
   VM Regions Near 0x68:
   -->
       __TEXT                      10bbcf000-10c11b000    [ 5424K] r-x/r-x 
SM=COW  /Users/*
   
   Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
   0   libsystem_c.dylib                   0x00007fff2077925c flockfile + 18
   1   libsystem_c.dylib                   0x00007fff2077c6c4 getc + 15
   2   redis_cli                           0x000000010bbd0759 
cli_getc(__sFILE*) + 9 (redis_cli.cpp:79)
   3   libedit.3.dylib                     0x00007fff571b1f9b 0x7fff571a9000 + 
36763
   4   libedit.3.dylib                     0x00007fff571b14a8 el_wgetc + 105
   5   libedit.3.dylib                     0x00007fff571b1654 el_wgets + 98
   6   libedit.3.dylib                     0x00007fff571bc92f el_gets + 37
   7   libedit.3.dylib                     0x00007fff571b20cd readline + 229
   8   redis_cli                           0x000000010bbd048e main + 590 
(redis_cli.cpp:134)
   9   libdyld.dylib                       0x00007fff20886f3d start + 1
   
   Thread 1:
   0   libsystem_kernel.dylib              0x00007fff20838ba2 __semwait_signal 
+ 10
   1   libsystem_c.dylib                   0x00007fff207b8c1a nanosleep + 196
   2   libsystem_c.dylib                   0x00007fff207b8b14 usleep + 53
   3   redis_cli                           0x000000010bd41eda 
bvar::detail::SamplerCollector::run() + 698 (sampler.cpp:180)
   4   redis_cli                           0x000000010bd428b9 
bvar::detail::SamplerCollector::sampling_thread(void*) + 9 (sampler.cpp:110)
   5   libsystem_pthread.dylib             0x00007fff2086b8fc _pthread_start + 
224
   6   libsystem_pthread.dylib             0x00007fff20867443 thread_start + 15
   
   Thread 2:
   0   libsystem_kernel.dylib              0x00007fff20838cce __psynch_cvwait + 
10
   1   libsystem_pthread.dylib             0x00007fff2086be49 
_pthread_cond_wait + 1298
   2   redis_cli                           0x000000010bd54ddf 
bthread::futex_wait_private(void*, int, timespec const*) + 351 
(sys_futex.cpp:80)
   3   redis_cli                           0x000000010bd5df79 
bthread::TimerThread::run() + 2265 (timer_thread.cpp:431)
   4   redis_cli                           0x000000010bd5d699 
bthread::TimerThread::run_this(void*) + 9 (timer_thread.cpp:120)
   5   libsystem_pthread.dylib             0x00007fff2086b8fc _pthread_start + 
224
   6   libsystem_pthread.dylib             0x00007fff20867443 thread_start + 15
   
   
   
   
   .......
   
   
   Thread 0 crashed with X86 Thread State (64-bit):
     rax: 0x0000000115af5eac  rbx: 0x0000000000000000  rcx: 0x0000000115af5eac  
rdx: 0x0000000000000000
     rdi: 0x0000000000000000  rsi: 0x00007ffee40305a4  rbp: 0x00007ffee4030500  
rsp: 0x00007ffee40304f0
      r8: 0x0000000000000000   r9: 0x0000000000000000  r10: 0x000000000000000e  
r11: 0x00007fff2077c6b5
     r12: 0x00007f98f003a200  r13: 0x0000000000000000  r14: 0x0000000000000002  
r15: 0x00007ffee403061c
     rip: 0x00007fff2077925c  rfl: 0x0000000000010206  cr2: 0x0000000000000068
   
   Logical CPU:     0
   Error Code:      0x00000004 (no mapping for user data read)
   Trap Number:     14
   ```


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