usage: valgrind [options] prog-and-args tool-selection option, with default in [ ]: --tool= use the Valgrind tool named [memcheck] basic user options for all Valgrind tools, with defaults in [ ]: -h --help show this message --help-debug show this message, plus debugging options --version show version -q --quiet run silently; only print error msgs -v --verbose be more verbose -- show misc extra info --trace-children=no|yes Valgrind-ise child processes (follow execve)? [no] --trace-children-skip=patt1,patt2,... specifies a list of executables that --trace-children=yes should not trace into --trace-children-skip-by-arg=patt1,patt2,... same as --trace-children-skip= but check the argv[] entries for children, rather than the exe name, to make a follow/no-follow decision --child-silent-after-fork=no|yes omit child output between fork & exec? [no] --vgdb=no|yes|full activate gdbserver? [yes] full is slower but provides precise watchpoint/step --vgdb-error= invoke gdbserver after errors [999999999] to get started quickly, use --vgdb-error=0 and follow the on-screen directions --vgdb-stop-at=event1,event2,... invoke gdbserver for given events [none] where event is one of: startup exit valgrindabexit all none --track-fds=no|yes track open file descriptors? [no] --time-stamp=no|yes add timestamps to log messages? [no] --log-fd= log messages to file descriptor [2=stderr] --log-file= log messages to --log-socket=ipaddr:port log messages to socket ipaddr:port user options for Valgrind tools that report errors: --xml=yes emit error output in XML (some tools only) --xml-fd= XML output to file descriptor --xml-file= XML output to --xml-socket=ipaddr:port XML output to socket ipaddr:port --xml-user-comment=STR copy STR verbatim into XML output --demangle=no|yes automatically demangle C++ names? [yes] --num-callers= show callers in stack traces [12] --error-limit=no|yes stop showing new errors if too many? [yes] --error-exitcode= exit code to return if errors found [0=disable] --error-markers=, add lines with begin/end markers before/after each error output in plain text mode [none] --show-below-main=no|yes continue stack traces below main() [no] --default-suppressions=yes|no load default suppressions [yes] --suppressions= suppress errors described in --gen-suppressions=no|yes|all print suppressions for errors? [no] --input-fd= file descriptor for input [0=stdin] --dsymutil=no|yes run dsymutil on Mac OS X when helpful? [yes] --max-stackframe= assume stack switch for SP changes larger than bytes [2000000] --main-stacksize= set size of main thread's stack (in bytes) [min(max(current 'ulimit' value,1MB),16MB)] user options for Valgrind tools that replace malloc: --alignment= set minimum alignment of heap allocations [not used by this tool] --redzone-size= set minimum size of redzones added before/after heap blocks (in bytes). [not used by this tool] --xtree-memory=none|allocs|full profile heap memory in an xtree [none] and produces a report at the end of the execution none: no profiling, allocs: current allocated size/blocks, full: profile current and cumulative allocated size/blocks and freed size/blocks. --xtree-memory-file= xtree memory report file [xtmemory.kcg.%p] uncommon user options for all Valgrind tools: --fullpath-after= (with nothing after the '=') show full source paths in call stacks --fullpath-after=string like --fullpath-after=, but only show the part of the path after 'string'. Allows removal of path prefixes. Use this flag multiple times to specify a set of prefixes to remove. --extra-debuginfo-path=path absolute path to search for additional debug symbols, in addition to existing default well known search paths. --debuginfo-server=ipaddr:port also query this server (valgrind-di-server) for debug symbols --allow-mismatched-debuginfo=no|yes [no] for the above two flags only, accept debuginfo objects that don't "match" the main object --smc-check=none|stack|all|all-non-file [all-non-file] checks for self-modifying code: none, only for code found in stacks, for all code, or for all code except that from file-backed mappings --read-inline-info=yes|no read debug info about inlined function calls and use it to do better stack traces. [yes] on Linux/Android/Solaris for Memcheck/Helgrind/DRD only. [no] for all other tools and platforms. --read-var-info=yes|no read debug info on stack and global variables and use it to print better error messages in tools that make use of it (Memcheck, Helgrind, DRD) [no] --vgdb-poll= gdbserver poll max every basic blocks [5000] --vgdb-shadow-registers=no|yes let gdb see the shadow registers [no] --vgdb-prefix= prefix for vgdb FIFOs [.../vgdb-pipe] --run-libc-freeres=no|yes free up glibc memory at exit on Linux? [yes] --run-cxx-freeres=no|yes free up libstdc++ memory at exit on Linux and Solaris? [yes] --sim-hints=hint1,hint2,... activate unusual sim behaviours [none] where hint is one of: lax-ioctls lax-doors fuse-compatible enable-outer no-inner-prefix no-nptl-pthread-stackcache fallback-llsc none --fair-sched=no|yes|try schedule threads fairly on multicore systems [no] --kernel-variant=variant1,variant2,... handle non-standard kernel variants [none] where variant is one of: bproc android-no-hw-tls android-gpu-sgx5xx android-gpu-adreno3xx none --merge-recursive-frames= merge frames between identical program counters in max frames) [0] --num-transtab-sectors= size of translated code cache [32] more sectors may increase performance, but use more memory. --avg-transtab-entry-size= avg size in bytes of a translated basic block [0, meaning use tool provided default] --aspace-minaddr=0xPP avoid mapping memory below 0xPP [guessed] --valgrind-stacksize= size of valgrind (host) thread's stack (in bytes) [1048576] --show-emwarns=no|yes show warnings about emulation limits? [no] --require-text-symbol=:sonamepattern:symbolpattern abort run if the stated shared object doesn't have the stated text symbol. Patterns can contain ? and *. --soname-synonyms=syn1=pattern1,syn2=pattern2,... synonym soname specify patterns for function wrapping or replacement. To use a non-libc malloc library that is in the main exe: --soname-synonyms=somalloc=NONE in libxyzzy.so: --soname-synonyms=somalloc=libxyzzy.so --sigill-diagnostics=yes|no warn about illegal instructions? [yes] --unw-stack-scan-thresh= Enable stack-scan unwind if fewer than good frames found [0, meaning "disabled"] NOTE: stack scanning is only available on arm-linux. --unw-stack-scan-frames= Max number of frames that can be recovered by stack scanning [5] --resync-filter=no|yes|verbose [yes on MacOS, no on other OSes] attempt to avoid expensive address-space-resync operations --max-threads= maximum number of threads that valgrind can handle [500] user options for Nulgrind: (none) debugging options for all Valgrind tools: -d show verbose debugging output --stats=no|yes show tool and core statistics [no] --sanity-level= level of sanity checking to do [1] --trace-flags= show generated code? (X = 0|1) [00000000] --profile-flags= ditto, but for profiling (X = 0|1) [00000000] --profile-interval= show profile every event checks [0, meaning only at the end of the run] --trace-notbelow= only show BBs above [999999999] --trace-notabove= only show BBs below [0] --trace-syscalls=no|yes show all system calls? [no] --trace-signals=no|yes show signal handling details? [no] --trace-symtab=no|yes show symbol table details? [no] --trace-symtab-patt= limit debuginfo tracing to obj name --trace-cfi=no|yes show call-frame-info details? [no] --debug-dump=syms mimic /usr/bin/readelf --syms --debug-dump=line mimic /usr/bin/readelf --debug-dump=line --debug-dump=frames mimic /usr/bin/readelf --debug-dump=frames --trace-redir=no|yes show redirection details? [no] --trace-sched=no|yes show thread scheduler details? [no] --profile-heap=no|yes profile Valgrind's own space use --core-redzone-size= set minimum size of redzones added before/after heap blocks allocated for Valgrind internal use (in bytes) [4] --wait-for-gdb=yes|no pause on startup to wait for gdb attach --sym-offsets=yes|no show syms in form 'name+offset' ? [no] --command-line-only=no|yes only use command line options [no] Vex options for all Valgrind tools: --vex-iropt-verbosity=<0..9> [0] --vex-iropt-level=<0..2> [2] --vex-iropt-unroll-thresh=<0..400> [120] --vex-guest-max-insns=<1..100> [50] --vex-guest-chase-thresh=<0..99> [10] --vex-guest-chase-cond=no|yes [no] Precise exception control. Possible values for 'mode' are as follows and specify the minimum set of registers guaranteed to be correct immediately prior to memory access instructions: sp-at-mem-access stack pointer only unwindregs-at-mem-access registers needed for stack unwinding allregs-at-mem-access all registers allregs-at-each-insn all registers are always correct Default value for all 3 following flags is [unwindregs-at-mem-access]. --vex-iropt-register-updates=mode setting to use by default --px-default=mode synonym for --vex-iropt-register-updates --px-file-backed=mode optional setting for file-backed (non-JIT) code Tracing and profile control: --trace-flags and --profile-flags values (omit the middle space): 1000 0000 show conversion into IR 0100 0000 show after initial opt 0010 0000 show after instrumentation 0001 0000 show after second opt 0000 1000 show after tree building 0000 0100 show selecting insns 0000 0010 show after reg-alloc 0000 0001 show final assembly 0000 0000 show summary profile only (Nb: you need --trace-notbelow and/or --trace-notabove with --trace-flags for full details) debugging options for Valgrind tools that report errors --dump-error= show translation for basic block associated with 'th error context [0=show none] debugging options for Valgrind tools that replace malloc: --trace-malloc=no|yes show client malloc details? [no] --xtree-compress-strings=no|yes compress strings in xtree callgrind format [yes] debugging options for Nulgrind: (none) Extra options read from ~/.valgrindrc, $VALGRIND_OPTS, ./.valgrindrc Nulgrind is Copyright (C) 2002-2017, and GNU GPL'd, by Nicholas Nethercote. Valgrind is Copyright (C) 2000-2017, and GNU GPL'd, by Julian Seward et al. LibVEX is Copyright (C) 2004-2017, and GNU GPL'd, by OpenWorks LLP et al. Bug reports, feedback, admiration, abuse, etc, to: www.valgrind.org.