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057eff7663
Return 0 if there is no CFP on the EC yet StackProf uses a signal handler to call `rb_profile_frames`. Signals are delivered to threads randomly, and can be delivered after the thread has been created but before the CFP has been established on the EC. This commit returns early if there is no CFP to use. Here is some info from the core files we are seeing. Here you can see the CFP on the current EC is 0x0: ``` (gdb) p ruby_current_ec $20 = (struct rb_execution_context_struct *) 0x7f3481301b50 (gdb) p ruby_current_ec->cfp $21 = (rb_control_frame_t *) 0x0 ``` Here is where VM_FRAME_CFRAME_P gets a 0x0 CFP: ``` 6 VM_FRAME_CFRAME_P (cfp=0x0) at vm_core.h:1350 7 VM_FRAME_RUBYFRAME_P (cfp=<optimized out>) at vm_core.h:1350 8 rb_profile_frames (start=0, limit=2048, buff=0x7f3493809590, lines=0x7f349380d590) at vm_backtrace.c:1587 ``` Down the stack we can see this is happening after thread creation: ``` 19 0x00007f3495bf9420 in <signal handler called> () at /lib/x86_64-linux-gnu/libpthread.so.0 20 0x000055d531574e55 in thread_start_func_2 (th=<optimized out>, stack_start=<optimized out>) at thread.c:676 21 0x000055d531575b31 in thread_start_func_1 (th_ptr=<optimized out>) at thread_pthread.c:1170 22 0x00007f3495bed609 in start_thread (arg=<optimized out>) at pthread_create.c:477 23 0x00007f3495b12133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 ``` --- vm_backtrace.c | 9 +++++++++ 1 file changed, 9 insertions(+)
66 lines
2.3 KiB
C
66 lines
2.3 KiB
C
#ifndef RUBY_TOPLEVEL_VERSION_H /*-*-C-*-vi:se ft=c:*/
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#define RUBY_TOPLEVEL_VERSION_H
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/**
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* @author Ruby developers <ruby-core@ruby-lang.org>
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* @copyright This file is a part of the programming language Ruby.
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* Permission is hereby granted, to either redistribute and/or
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* modify this file, provided that the conditions mentioned in the
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* file COPYING are met. Consult the file for details.
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*/
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# define RUBY_VERSION_MAJOR RUBY_API_VERSION_MAJOR
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# define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
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#define RUBY_VERSION_TEENY 0
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#define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
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#define RUBY_PATCHLEVEL 5
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#include "ruby/version.h"
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#include "ruby/internal/abi.h"
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#ifndef RUBY_REVISION
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#include "revision.h"
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#ifndef TOKEN_PASTE
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#define TOKEN_PASTE(x,y) x##y
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#endif
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#define ONLY_ONE_DIGIT(x) TOKEN_PASTE(10,x) < 1000
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#define WITH_ZERO_PADDING(x) TOKEN_PASTE(0,x)
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#define RUBY_BIRTH_YEAR_STR STRINGIZE(RUBY_BIRTH_YEAR)
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#define RUBY_RELEASE_YEAR_STR STRINGIZE(RUBY_RELEASE_YEAR)
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#if ONLY_ONE_DIGIT(RUBY_RELEASE_MONTH)
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#define RUBY_RELEASE_MONTH_STR STRINGIZE(WITH_ZERO_PADDING(RUBY_RELEASE_MONTH))
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#else
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#define RUBY_RELEASE_MONTH_STR STRINGIZE(RUBY_RELEASE_MONTH)
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#endif
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#if ONLY_ONE_DIGIT(RUBY_RELEASE_DAY)
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#define RUBY_RELEASE_DAY_STR STRINGIZE(WITH_ZERO_PADDING(RUBY_RELEASE_DAY))
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#else
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#define RUBY_RELEASE_DAY_STR STRINGIZE(RUBY_RELEASE_DAY)
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#endif
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#endif
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#ifdef RUBY_ABI_VERSION
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# define RUBY_ABI_VERSION_SUFFIX "+"STRINGIZE(RUBY_ABI_VERSION)
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#else
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# define RUBY_ABI_VERSION_SUFFIX ""
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#endif
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#if !defined RUBY_LIB_VERSION && defined RUBY_LIB_VERSION_STYLE
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# if RUBY_LIB_VERSION_STYLE == 3
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# define RUBY_LIB_VERSION STRINGIZE(RUBY_API_VERSION_MAJOR)"."STRINGIZE(RUBY_API_VERSION_MINOR) \
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"."STRINGIZE(RUBY_API_VERSION_TEENY) RUBY_ABI_VERSION_SUFFIX
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# elif RUBY_LIB_VERSION_STYLE == 2
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# define RUBY_LIB_VERSION STRINGIZE(RUBY_API_VERSION_MAJOR)"."STRINGIZE(RUBY_API_VERSION_MINOR) \
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RUBY_ABI_VERSION_SUFFIX
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# endif
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#endif
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#if RUBY_PATCHLEVEL == -1
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#define RUBY_PATCHLEVEL_STR "dev"
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#elif defined RUBY_ABI_VERSION
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#error RUBY_ABI_VERSION is defined in non-development branch
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#else
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#define RUBY_PATCHLEVEL_STR ""
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#endif
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#endif /* RUBY_TOPLEVEL_VERSION_H */
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