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Bug #16654

Updated by nobu (Nobuyoshi Nakada) 9 months ago

Seen in ruby 2.6.5. 

 ``` 
 -- C level backtrace information ------------------------------------------- 
 /Users/nateberkopec/.rubies/ruby-2.6.5/bin/ruby(rb_vm_bugreport+0x82) [0x10632d9c2] 
 /Users/nateberkopec/.rubies/ruby-2.6.5/bin/ruby(rb_bug_context+0x1d8) [0x1061940a8] 
 /Users/nateberkopec/.rubies/ruby-2.6.5/bin/ruby(sigsegv+0x51) [0x10629be41] 
 /usr/lib/system/libsystem_platform.dylib(_sigtramp+0x1d) [0x7fff67bd442d] 
 /Users/nateberkopec/.rubies/ruby-2.6.5/bin/ruby(ruby_sip_hash13+0xf0) [0x106257bf0] 
 /Users/nateberkopec/.rubies/ruby-2.6.5/bin/ruby(rb_str_hash+0x6c) [0x1062b035c] 
 /Users/nateberkopec/.rubies/ruby-2.6.5/bin/ruby(st_general_delete+0x27) [0x1062a5287] 
 /Users/nateberkopec/.rubies/ruby-2.6.5/bin/ruby(rb_str_free+0x61) [0x1062b3401] 
 /Users/nateberkopec/.rubies/ruby-2.6.5/bin/ruby(obj_free+0x270) [0x1061bbf30] 
 /Users/nateberkopec/.rubies/ruby-2.6.5/bin/ruby(gc_sweep_step+0x24c) [0x1061bb66c] 
 /Users/nateberkopec/.rubies/ruby-2.6.5/bin/ruby(gc_sweep+0xdb) [0x1061bd37b] 
 /Users/nateberkopec/.rubies/ruby-2.6.5/bin/ruby(gc_start+0xa48) [0x1061bafc8] 
 /Users/nateberkopec/.rubies/ruby-2.6.5/bin/ruby(gc_start_internal+0x282) [0x1061b7a32] 
 /Users/nateberkopec/.rubies/ruby-2.6.5/bin/ruby(vm_call_cfunc+0x15b) [0x1063210fb] 
 /Users/nateberkopec/.rubies/ruby-2.6.5/bin/ruby(vm_exec_core+0x32aa) [0x10630b19a] 
 /Users/nateberkopec/.rubies/ruby-2.6.5/bin/ruby(rb_vm_exec+0xa0c) [0x10631c04c] 
 /Users/nateberkopec/.rubies/ruby-2.6.5/bin/ruby(ruby_exec_internal+0xd8) [0x10619eeb8] 
 /Users/nateberkopec/.rubies/ruby-2.6.5/bin/ruby(ruby_run_node+0x49) [0x10619ed49] 
 /Users/nateberkopec/.rubies/ruby-2.6.5/bin/ruby(main+0x5d) [0x10611775d] 
 ``` 

 Another dump posted here: 

 https://github.com/SamSaffron/memory_profiler/issues/83 

 For reproduction, I was wrapping MemoryProfiler around a Rails application startup, but it may be possible to repro this in a much simpler way. 

 ```ruby 
 require "memory_profiler" 
 report = MemoryProfiler.report do 
   require ::File.expand_path('../config/environment', __FILE__) 
 end 

 report.pretty_print 
 ```

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