diff options
Diffstat (limited to 'mysys/stacktrace.c')
| -rw-r--r-- | mysys/stacktrace.c | 735 |
1 files changed, 735 insertions, 0 deletions
diff --git a/mysys/stacktrace.c b/mysys/stacktrace.c new file mode 100644 index 00000000..5718b2e7 --- /dev/null +++ b/mysys/stacktrace.c @@ -0,0 +1,735 @@ +/* + Copyright (c) 2001, 2011, Oracle and/or its affiliates + Copyright (c) 2020, MariaDB Corporation. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; version 2 of the License. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */ + +#include "mysys_priv.h" +#include <my_stacktrace.h> + +#ifndef __WIN__ +#include <signal.h> +#include <m_string.h> +#ifdef HAVE_STACKTRACE +#include <unistd.h> +#include <strings.h> + +#ifdef __linux__ +#include <ctype.h> /* isprint */ +#include <sys/syscall.h> /* SYS_gettid */ +#endif + +#if HAVE_EXECINFO_H +#include <execinfo.h> +#endif + +/** + Default handler for printing stacktrace +*/ + +static sig_handler default_handle_fatal_signal(int sig) +{ + my_safe_printf_stderr("%s: Got signal %d. Attempting backtrace\n", + my_progname_short, sig); + my_print_stacktrace(0,0,1); +#ifndef __WIN__ + signal(sig, SIG_DFL); + kill(getpid(), sig); +#endif /* __WIN__ */ + return; +} + + +/** + Initialize priting off stacktrace at signal +*/ + +void my_setup_stacktrace(void) +{ + struct sigaction sa; + sa.sa_flags = SA_RESETHAND | SA_NODEFER; + sigemptyset(&sa.sa_mask); + sa.sa_handler= default_handle_fatal_signal; + sigaction(SIGSEGV, &sa, NULL); + sigaction(SIGABRT, &sa, NULL); +#ifdef SIGBUS + sigaction(SIGBUS, &sa, NULL); +#endif + sigaction(SIGILL, &sa, NULL); + sigaction(SIGFPE, &sa, NULL); +} + + +/* + Attempt to print a char * pointer as a string. + + SYNOPSIS + Prints either until the end of string ('\0'), or max_len characters have + been printed. + + RETURN VALUE + 0 Pointer was within the heap address space. + The string was printed fully, or until the end of the heap address space. + 1 Pointer is outside the heap address space. Printed as invalid. + + NOTE + On some systems, we can have valid pointers outside the heap address space. + This is through the use of mmap inside malloc calls. When this function + returns 1, it does not mean 100% that the pointer is corrupted. +*/ + +int my_safe_print_str(const char* val, size_t max_len) +{ + const char *orig_val= val; + if (!val) + { + my_safe_printf_stderr("%s", "(null)"); + return 1; + } + + for (; max_len; --max_len) + { + if (my_write_stderr((val++), 1) != 1) + { + if ((errno == EFAULT) &&(val == orig_val + 1)) + { + // We can not read the address from very beginning + my_safe_printf_stderr("Can't access address %p", orig_val); + } + break; + } + } + my_safe_printf_stderr("%s", "\n"); + + return 0; +} + +#if defined(HAVE_PRINTSTACK) + +/* Use Solaris' symbolic stack trace routine. */ +#include <ucontext.h> + +void my_print_stacktrace(uchar* stack_bottom __attribute__((unused)), + ulong thread_stack __attribute__((unused)), + my_bool silent) +{ + if (printstack(fileno(stderr)) == -1) + my_safe_printf_stderr("%s", + "Error when traversing the stack, stack appears corrupt.\n"); + else if (!silent) + my_safe_printf_stderr("%s", + "Please read " + "http://dev.mysql.com/doc/refman/5.1/en/resolve-stack-dump.html\n" + "and follow instructions on how to resolve the stack trace.\n" + "Resolved stack trace is much more helpful in diagnosing the\n" + "problem, so please do resolve it\n"); +} + +#elif HAVE_BACKTRACE && (HAVE_BACKTRACE_SYMBOLS || HAVE_BACKTRACE_SYMBOLS_FD) + +#if BACKTRACE_DEMANGLE + +char __attribute__ ((weak)) * +my_demangle(const char *mangled_name __attribute__((unused)), + int *status __attribute__((unused))) +{ + return NULL; +} + +static void my_demangle_symbols(char **addrs, int n) +{ + int status, i; + char *begin, *end, *demangled; + + for (i= 0; i < n; i++) + { + demangled= NULL; + begin= strchr(addrs[i], '('); + end= begin ? strchr(begin, '+') : NULL; + + if (begin && end) + { + *begin++= *end++= '\0'; + demangled= my_demangle(begin, &status); + if (!demangled || status) + { + demangled= NULL; + begin[-1]= '('; + end[-1]= '+'; + } + } + + if (demangled) + my_safe_printf_stderr("%s(%s+%s\n", addrs[i], demangled, end); + else + my_safe_printf_stderr("%s\n", addrs[i]); + } +} + +#endif /* BACKTRACE_DEMANGLE */ + +#if HAVE_MY_ADDR_RESOLVE +static int print_with_addr_resolve(void **addrs, int n) +{ + int i; + const char *err; + + if ((err= my_addr_resolve_init())) + { + my_safe_printf_stderr("(my_addr_resolve failure: %s)\n", err); + return 0; + } + + for (i= 0; i < n; i++) + { + my_addr_loc loc; + if (my_addr_resolve(addrs[i], &loc)) + backtrace_symbols_fd(addrs+i, 1, fileno(stderr)); + else + my_safe_printf_stderr("%s:%u(%s)[%p]\n", + loc.file, loc.line, loc.func, addrs[i]); + } + return 1; +} +#endif + +void my_print_stacktrace(uchar* stack_bottom, ulong thread_stack, + my_bool silent __attribute__((unused))) +{ + void *addrs[128]; + char **strings __attribute__((unused)) = NULL; + int n = backtrace(addrs, array_elements(addrs)); + my_safe_printf_stderr("stack_bottom = %p thread_stack 0x%lx\n", + stack_bottom, thread_stack); +#if HAVE_MY_ADDR_RESOLVE + if (print_with_addr_resolve(addrs, n)) + return; +#endif +#if BACKTRACE_DEMANGLE + if ((strings= backtrace_symbols(addrs, n))) + { + my_demangle_symbols(strings, n); + free(strings); + return; + } +#endif +#if HAVE_BACKTRACE_SYMBOLS_FD + backtrace_symbols_fd(addrs, n, fileno(stderr)); +#endif +} + +#elif defined(TARGET_OS_LINUX) + +#ifdef __i386__ +#define SIGRETURN_FRAME_OFFSET 17 +#endif + +#ifdef __x86_64__ +#define SIGRETURN_FRAME_OFFSET 23 +#endif + +#if defined(__alpha__) && defined(__GNUC__) +/* + The only way to backtrace without a symbol table on alpha + is to find stq fp,N(sp), and the first byte + of the instruction opcode will give us the value of N. From this + we can find where the old value of fp is stored +*/ + +#define MAX_INSTR_IN_FUNC 10000 + +inline uchar** find_prev_fp(uint32* pc, uchar** fp) +{ + int i; + for (i = 0; i < MAX_INSTR_IN_FUNC; ++i,--pc) + { + uchar* p = (uchar*)pc; + if (p[2] == 222 && p[3] == 35) + { + return (uchar**)((uchar*)fp - *(short int*)p); + } + } + return 0; +} + +inline uint32* find_prev_pc(uint32* pc, uchar** fp) +{ + int i; + for (i = 0; i < MAX_INSTR_IN_FUNC; ++i,--pc) + { + char* p = (char*)pc; + if (p[1] == 0 && p[2] == 94 && p[3] == -73) + { + uint32* prev_pc = (uint32*)*((fp+p[0]/sizeof(fp))); + return prev_pc; + } + } + return 0; +} +#endif /* defined(__alpha__) && defined(__GNUC__) */ + +void my_print_stacktrace(uchar* stack_bottom, ulong thread_stack, + my_bool silent) +{ + uchar** UNINIT_VAR(fp); + uint frame_count = 0, sigreturn_frame_count; +#if defined(__alpha__) && defined(__GNUC__) + uint32* pc; +#endif + + +#ifdef __i386__ + __asm __volatile__ ("movl %%ebp,%0" + :"=r"(fp) + :"r"(fp)); +#endif +#ifdef __x86_64__ + __asm __volatile__ ("movq %%rbp,%0" + :"=r"(fp) + :"r"(fp)); +#endif +#if defined(__alpha__) && defined(__GNUC__) + __asm __volatile__ ("mov $30,%0" + :"=r"(fp) + :"r"(fp)); +#endif + if (!fp) + { + my_safe_printf_stderr("%s", + "frame pointer is NULL, did you compile with\n" + "-fomit-frame-pointer? Aborting backtrace!\n"); + return; + } + + if (!stack_bottom || (uchar*) stack_bottom > (uchar*) &fp) + { + ulong tmp= MY_MIN(0x10000,thread_stack); + /* Assume that the stack starts at the previous even 65K */ + stack_bottom= (uchar*) (((ulong) &fp + tmp) & ~(ulong) 0xFFFF); + my_safe_printf_stderr("Cannot determine thread, fp=%p, " + "backtrace may not be correct.\n", fp); + } + if (fp > (uchar**) stack_bottom || + fp < (uchar**) stack_bottom - thread_stack) + { + my_safe_printf_stderr("Bogus stack limit or frame pointer, " + "fp=%p, stack_bottom=%p, thread_stack=%ld, " + "aborting backtrace.\n", + fp, stack_bottom, thread_stack); + return; + } + + my_safe_printf_stderr("%s", + "Stack range sanity check OK, backtrace follows:\n"); +#if defined(__alpha__) && defined(__GNUC__) + my_safe_printf_stderr("%s", + "Warning: Alpha stacks are difficult -" + "will be taking some wild guesses, stack trace may be incorrect or " + "terminate abruptly\n"); + + /* On Alpha, we need to get pc */ + __asm __volatile__ ("bsr %0, do_next; do_next: " + :"=r"(pc) + :"r"(pc)); +#endif /* __alpha__ */ + + /* We are 1 frame above signal frame with NPTL */ + sigreturn_frame_count = 1; + + while (fp < (uchar**) stack_bottom) + { +#if defined(__i386__) || defined(__x86_64__) + uchar** new_fp = (uchar**)*fp; + my_safe_printf_stderr("%p\n", + frame_count == sigreturn_frame_count ? + *(fp + SIGRETURN_FRAME_OFFSET) : *(fp + 1)); +#endif /* defined(__386__) || defined(__x86_64__) */ + +#if defined(__alpha__) && defined(__GNUC__) + uchar** new_fp = find_prev_fp(pc, fp); + if (frame_count == sigreturn_frame_count - 1) + { + new_fp += 90; + } + + if (fp && pc) + { + pc = find_prev_pc(pc, fp); + if (pc) + my_safe_printf_stderr("%p\n", pc); + else + { + my_safe_printf_stderr("%s", + "Not smart enough to deal with the rest of this stack\n"); + goto end; + } + } + else + { + my_safe_printf_stderr("%s", + "Not smart enough to deal with the rest of this stack\n"); + goto end; + } +#endif /* defined(__alpha__) && defined(__GNUC__) */ + if (new_fp <= fp ) + { + my_safe_printf_stderr("New value of fp=%p failed sanity check, " + "terminating stack trace!\n", new_fp); + goto end; + } + fp = new_fp; + ++frame_count; + } + my_safe_printf_stderr("%s", + "Stack trace seems successful - bottom reached\n"); + +end: + if (!silent) + my_safe_printf_stderr("%s", + "Please read " + "http://dev.mysql.com/doc/refman/5.1/en/resolve-stack-dump.html\n" + "and follow instructions on how to resolve the stack trace.\n" + "Resolved stack trace is much more helpful in diagnosing the\n" + "problem, so please do resolve it\n"); +} +#endif /* TARGET_OS_LINUX */ +#endif /* HAVE_STACKTRACE */ + +/* Produce a core for the thread */ +void my_write_core(int sig) +{ +#ifdef HAVE_gcov + extern void __gcov_flush(void); +#endif + signal(sig, SIG_DFL); +#ifdef HAVE_gcov + /* + For GCOV build, crashing will prevent the writing of code coverage + information from this process, causing gcov output to be incomplete. + So we force the writing of coverage information here before terminating. + */ + __gcov_flush(); +#endif + pthread_kill(pthread_self(), sig); +#if defined(P_MYID) && !defined(SCO) + /* On Solaris, the above kill is not enough */ + sigsend(P_PID,P_MYID,sig); +#endif +} + +#else /* __WIN__*/ + +#ifdef _MSC_VER +/* Silence warning in OS header dbghelp.h */ +#pragma warning(push) +#pragma warning(disable : 4091) +#endif + +#include <dbghelp.h> + +#ifdef _MSC_VER +#pragma warning(pop) +#endif + +#include <tlhelp32.h> +#include <my_sys.h> +#if _MSC_VER +#pragma comment(lib, "dbghelp") +#endif + +static EXCEPTION_POINTERS *exception_ptrs; + +#define MODULE64_SIZE_WINXP 576 +#define STACKWALK_MAX_FRAMES 64 + +void my_set_exception_pointers(EXCEPTION_POINTERS *ep) +{ + exception_ptrs = ep; +} + +/* + Appends directory to symbol path. +*/ +static void add_to_symbol_path(char *path, size_t path_buffer_size, + char *dir, size_t dir_buffer_size) +{ + strcat_s(dir, dir_buffer_size, ";"); + if (!strstr(path, dir)) + { + strcat_s(path, path_buffer_size, dir); + } +} + +/* + Get symbol path - semicolon-separated list of directories to search + for debug symbols. We expect PDB in the same directory as + corresponding exe or dll, so the path is build from directories of + the loaded modules. If environment variable _NT_SYMBOL_PATH is set, + it's value appended to the symbol search path +*/ +static void get_symbol_path(char *path, size_t size) +{ + HANDLE hSnap; + char *envvar; + char *p; +#ifndef DBUG_OFF + static char pdb_debug_dir[MAX_PATH + 7]; +#endif + + path[0]= '\0'; + +#ifndef DBUG_OFF + /* + Add "debug" subdirectory of the application directory, sometimes PDB will + placed here by installation. + */ + GetModuleFileName(NULL, pdb_debug_dir, MAX_PATH); + p= strrchr(pdb_debug_dir, '\\'); + if(p) + { + *p= 0; + strcat_s(pdb_debug_dir, sizeof(pdb_debug_dir), "\\debug;"); + add_to_symbol_path(path, size, pdb_debug_dir, sizeof(pdb_debug_dir)); + } +#endif + + /* + Enumerate all modules, and add their directories to the path. + Avoid duplicate entries. + */ + hSnap= CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, GetCurrentProcessId()); + if (hSnap != INVALID_HANDLE_VALUE) + { + BOOL ret; + MODULEENTRY32 mod; + mod.dwSize= sizeof(MODULEENTRY32); + for (ret= Module32First(hSnap, &mod); ret; ret= Module32Next(hSnap, &mod)) + { + char *module_dir= mod.szExePath; + p= strrchr(module_dir,'\\'); + if (!p) + { + /* + Path separator was not found. Not known to happen, if ever happens, + will indicate current directory. + */ + module_dir[0]= '.'; + module_dir[1]= '\0'; + } + else + { + *p= '\0'; + } + add_to_symbol_path(path, size, module_dir,sizeof(mod.szExePath)); + } + CloseHandle(hSnap); + } + + + /* Add _NT_SYMBOL_PATH, if present. */ + envvar= getenv("_NT_SYMBOL_PATH"); + if(envvar) + { + strcat_s(path, size, envvar); + } +} + +#define MAX_SYMBOL_PATH 32768 + +/* Platform SDK in VS2003 does not have definition for SYMOPT_NO_PROMPTS*/ +#ifndef SYMOPT_NO_PROMPTS +#define SYMOPT_NO_PROMPTS 0 +#endif + +void my_print_stacktrace(uchar* unused1, ulong unused2, my_bool silent) +{ + HANDLE hProcess= GetCurrentProcess(); + HANDLE hThread= GetCurrentThread(); + static IMAGEHLP_MODULE64 module= {sizeof(module)}; + static IMAGEHLP_SYMBOL64_PACKAGE package; + DWORD64 addr; + DWORD machine; + int i; + CONTEXT context; + STACKFRAME64 frame={0}; + static char symbol_path[MAX_SYMBOL_PATH]; + + if(!exception_ptrs) + return; + + /* Copy context, as stackwalking on original will unwind the stack */ + context = *(exception_ptrs->ContextRecord); + /*Initialize symbols.*/ + SymSetOptions(SYMOPT_LOAD_LINES|SYMOPT_NO_PROMPTS|SYMOPT_DEFERRED_LOADS|SYMOPT_DEBUG); + get_symbol_path(symbol_path, sizeof(symbol_path)); + SymInitialize(hProcess, symbol_path, TRUE); + + /*Prepare stackframe for the first StackWalk64 call*/ + frame.AddrFrame.Mode= frame.AddrPC.Mode= frame.AddrStack.Mode= AddrModeFlat; +#if (defined _M_IX86) + machine= IMAGE_FILE_MACHINE_I386; + frame.AddrFrame.Offset= context.Ebp; + frame.AddrPC.Offset= context.Eip; + frame.AddrStack.Offset= context.Esp; +#elif (defined _M_X64) + machine = IMAGE_FILE_MACHINE_AMD64; + frame.AddrFrame.Offset= context.Rbp; + frame.AddrPC.Offset= context.Rip; + frame.AddrStack.Offset= context.Rsp; +#else + /*There is currently no need to support IA64*/ +#pragma error ("unsupported architecture") +#endif + + package.sym.SizeOfStruct= sizeof(package.sym); + package.sym.MaxNameLength= sizeof(package.name); + + /*Walk the stack, output useful information*/ + for(i= 0; i< STACKWALK_MAX_FRAMES;i++) + { + DWORD64 function_offset= 0; + DWORD line_offset= 0; + IMAGEHLP_LINE64 line= {sizeof(line)}; + BOOL have_module= FALSE; + BOOL have_symbol= FALSE; + BOOL have_source= FALSE; + + if(!StackWalk64(machine, hProcess, hThread, &frame, &context, 0, 0, 0 ,0)) + break; + addr= frame.AddrPC.Offset; + + have_module= SymGetModuleInfo64(hProcess,addr,&module); +#ifdef _M_IX86 + if(!have_module) + { + /* + ModuleInfo structure has been "compatibly" extended in + releases after XP, and its size was increased. To make XP + dbghelp.dll function happy, pretend passing the old structure. + */ + module.SizeOfStruct= MODULE64_SIZE_WINXP; + have_module= SymGetModuleInfo64(hProcess, addr, &module); + } +#endif + + have_symbol= SymGetSymFromAddr64(hProcess, addr, &function_offset, + &(package.sym)); + have_source= SymGetLineFromAddr64(hProcess, addr, &line_offset, &line); + + if(have_module) + { + const char *base_image_name= my_basename(module.ImageName); + my_safe_printf_stderr("%s!", base_image_name); + } + if(have_symbol) + my_safe_printf_stderr("%s()", package.sym.Name); + + else if(have_module) + my_safe_printf_stderr("%s", "???"); + + if(have_source) + { + const char *base_file_name= my_basename(line.FileName); + my_safe_printf_stderr("[%s:%lu]", + base_file_name, line.LineNumber); + } + my_safe_printf_stderr("%s", "\n"); + } +} + + +/* + Write dump. The dump is created in current directory, + file name is constructed from executable name plus + ".dmp" extension +*/ +void my_write_core(int unused) +{ + char path[MAX_PATH]; + char dump_fname[MAX_PATH]= "core.dmp"; + MINIDUMP_EXCEPTION_INFORMATION info; + HANDLE hFile; + + if(!exception_ptrs) + return; + + info.ExceptionPointers= exception_ptrs; + info.ClientPointers= FALSE; + info.ThreadId= GetCurrentThreadId(); + + if(GetModuleFileName(NULL, path, sizeof(path))) + { + _splitpath(path, NULL, NULL,dump_fname,NULL); + strcat_s(dump_fname, sizeof(dump_fname), ".dmp"); + } + + hFile= CreateFile(dump_fname, GENERIC_WRITE, 0, 0, CREATE_ALWAYS, + FILE_ATTRIBUTE_NORMAL, 0); + if(hFile) + { + /* Create minidump */ + if(MiniDumpWriteDump(GetCurrentProcess(), GetCurrentProcessId(), + hFile, MiniDumpNormal, &info, 0, 0)) + { + my_safe_printf_stderr("Minidump written to %s\n", + _fullpath(path, dump_fname, sizeof(path)) ? + path : dump_fname); + } + else + { + my_safe_printf_stderr("MiniDumpWriteDump() failed, last error %u\n", + (uint) GetLastError()); + } + CloseHandle(hFile); + } + else + { + my_safe_printf_stderr("CreateFile(%s) failed, last error %u\n", + dump_fname, (uint) GetLastError()); + } +} + + +int my_safe_print_str(const char *val, size_t len) +{ + __try + { + my_write_stderr(val, len); + } + __except(EXCEPTION_EXECUTE_HANDLER) + { + my_safe_printf_stderr("%s", "is an invalid string pointer"); + } + return 0; +} +#endif /*__WIN__*/ + + +size_t my_write_stderr(const void *buf, size_t count) +{ + return (size_t) write(fileno(stderr), buf, (uint)count); +} + + +size_t my_safe_printf_stderr(const char* fmt, ...) +{ + char to[512]; + size_t result; + va_list args; + va_start(args,fmt); + result= my_vsnprintf(to, sizeof(to), fmt, args); + va_end(args); + my_write_stderr(to, result); + return result; +} |