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That's all we know. X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , robert.foley@linaro.org, alex.bennee@linaro.org, cota@braap.org, Stefan Hajnoczi , Lingfeng Yang , peter.puhov@linaro.org, =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Lingfeng Yang We tried running QEMU under tsan in 2016, but tsan's lack of support for longjmp-based fibers was a blocker: https://groups.google.com/forum/#!topic/thread-sanitizer/se0YuzfWazw Fortunately, thread sanitizer gained fiber support in early 2019: https://reviews.llvm.org/D54889 This patch brings tsan support upstream by importing the patch that annotat= ed QEMU's coroutines as tsan fibers in Android's QEMU fork: https://android-review.googlesource.com/c/platform/external/qemu/+/844675 Tested with '--enable-tsan --cc=3Dclang-9 --cxx=3Dclang++-9 --disable-werro= r' configure flags. Signed-off-by: Lingfeng Yang Signed-off-by: Emilio G. Cota [cota: minor modifications + configure changes] Signed-off-by: Robert Foley [RF: configure changes for warnings, erorr handling + minor modifications] Reviewed-by: Alex Benn=C3=A9e --- configure | 47 ++++++++++++++++++- util/coroutine-ucontext.c | 97 +++++++++++++++++++++++++++++++++++---- 2 files changed, 134 insertions(+), 10 deletions(-) diff --git a/configure b/configure index f087d2bcd1..9b50820366 100755 --- a/configure +++ b/configure @@ -395,6 +395,7 @@ gprof=3D"no" debug_tcg=3D"no" debug=3D"no" sanitizers=3D"no" +tsan=3D"no" fortify_source=3D"" strip_opt=3D"yes" tcg_interpreter=3D"no" @@ -1150,6 +1151,10 @@ for opt do ;; --disable-sanitizers) sanitizers=3D"no" ;; + --enable-tsan) tsan=3D"yes" + ;; + --disable-tsan) tsan=3D"no" + ;; --enable-sparse) sparse=3D"yes" ;; --disable-sparse) sparse=3D"no" @@ -1750,6 +1755,7 @@ Advanced options (experts only): --with-pkgversion=3DVERS use specified string as sub-version of the pa= ckage --enable-debug enable common debug build options --enable-sanitizers enable default sanitizers + --enable-tsan enable thread sanitizer --disable-strip disable stripping binaries --disable-werror disable compilation abort on warning --disable-stack-protector disable compiler-provided stack protection @@ -6192,6 +6198,30 @@ if test "$fuzzing" =3D "yes" ; then fi fi =20 +# Thread sanitizer is, for now, much noisier than the other sanitizers; +# keep it separate until that is not the case. +if test "$tsan" =3D "yes" && test "$sanitizers" =3D "yes"; then + error_exit "TSAN is not supported with other sanitiziers." +fi +have_tsan=3Dno +have_tsan_iface_fiber=3Dno +if test "$tsan" =3D "yes" ; then + write_c_skeleton + if compile_prog "$CPU_CFLAGS -Werror -fsanitize=3Dthread" "" ; then + have_tsan=3Dyes + fi + cat > $TMPC << EOF +#include +int main(void) { + __tsan_create_fiber(0); + return 0; +} +EOF + if compile_prog "$CPU_CFLAGS -Werror -fsanitize=3Dthread" "" ; then + have_tsan_iface_fiber=3Dyes + fi +fi + ########################################## # check for libpmem =20 @@ -6293,6 +6323,16 @@ if test "$have_asan" =3D "yes"; then "Without code annotation, the report may be inferior." fi fi +if test "$have_tsan" =3D "yes" ; then + if test "$have_tsan_iface_fiber" =3D "yes" ; then + QEMU_CFLAGS=3D"-fsanitize=3Dthread $QEMU_CFLAGS" + QEMU_LDFLAGS=3D"-fsanitize=3Dthread $QEMU_LDFLAGS" + else + error_exit "Cannot enable TSAN due to missing fiber annotation interfa= ce." + fi +elif test "$tsan" =3D "yes" ; then + error_exit "Cannot enable TSAN due to missing sanitize thread interface." +fi if test "$have_ubsan" =3D "yes"; then QEMU_CFLAGS=3D"-fsanitize=3Dundefined $QEMU_CFLAGS" QEMU_LDFLAGS=3D"-fsanitize=3Dundefined $QEMU_LDFLAGS" @@ -6328,7 +6368,8 @@ if test "$werror" =3D "yes"; then QEMU_CFLAGS=3D"-Werror $QEMU_CFLAGS" fi =20 -if test "$solaris" =3D "no" ; then +# Exclude --warn-common with TSan to suppress warnings from the TSan libra= ries. +if test "$solaris" =3D "no" && test "$tsan" =3D "no"; then if $ld --version 2>/dev/null | grep "GNU ld" >/dev/null 2>/dev/null ; = then QEMU_LDFLAGS=3D"-Wl,--warn-common $QEMU_LDFLAGS" fi @@ -7382,6 +7423,10 @@ if test "$have_asan_iface_fiber" =3D "yes" ; then echo "CONFIG_ASAN_IFACE_FIBER=3Dy" >> $config_host_mak fi =20 +if test "$have_tsan" =3D "yes" && test "$have_tsan_iface_fiber" =3D "yes" = ; then + echo "CONFIG_TSAN=3Dy" >> $config_host_mak +fi + if test "$has_environ" =3D "yes" ; then echo "CONFIG_HAS_ENVIRON=3Dy" >> $config_host_mak fi diff --git a/util/coroutine-ucontext.c b/util/coroutine-ucontext.c index bd593e61bc..a3dc78e67a 100644 --- a/util/coroutine-ucontext.c +++ b/util/coroutine-ucontext.c @@ -37,18 +37,33 @@ #endif #endif =20 +#ifdef CONFIG_TSAN +#include +#endif + typedef struct { Coroutine base; void *stack; size_t stack_size; sigjmp_buf env; =20 + void *tsan_co_fiber; + void *tsan_caller_fiber; + #ifdef CONFIG_VALGRIND_H unsigned int valgrind_stack_id; #endif =20 } CoroutineUContext; =20 +#define UC_DEBUG 0 +#if UC_DEBUG && defined(CONFIG_TSAN) +#define UC_TRACE(fmt, ...) fprintf(stderr, "%s:%d:%p " fmt "\n", \ + __func__, __LINE__, __tsan_get_current_fiber(), ##__VA_ARGS__); +#else +#define UC_TRACE(fmt, ...) +#endif + /** * Per-thread coroutine bookkeeping */ @@ -65,7 +80,20 @@ union cc_arg { int i[2]; }; =20 -static void finish_switch_fiber(void *fake_stack_save) +/* QEMU_ALWAYS_INLINE only does so if __OPTIMIZE__, so we cannot use it. */ +static inline __attribute__((always_inline)) +void on_new_fiber(CoroutineUContext *co) +{ +#ifdef CONFIG_TSAN + co->tsan_co_fiber =3D __tsan_create_fiber(0); /* flags: sync on switch= */ + co->tsan_caller_fiber =3D __tsan_get_current_fiber(); + UC_TRACE("Create new TSAN co fiber. co: %p co fiber: %p caller fiber: = %p ", + co, co->tsan_co_fiber, co->tsan_caller_fiber); +#endif +} + +static inline __attribute__((always_inline)) +void finish_switch_fiber(void *fake_stack_save) { #ifdef CONFIG_ASAN const void *bottom_old; @@ -78,18 +106,40 @@ static void finish_switch_fiber(void *fake_stack_save) leader.stack_size =3D size_old; } #endif +#ifdef CONFIG_TSAN + if (fake_stack_save) { + __tsan_release(fake_stack_save); + __tsan_switch_to_fiber(fake_stack_save, 0); /* 0=3Dsynchronize */ + } +#endif } =20 -static void start_switch_fiber(void **fake_stack_save, - const void *bottom, size_t size) +static inline __attribute__((always_inline)) void start_switch_fiber( + CoroutineAction action, void **fake_stack_save, + const void *bottom, size_t size, void *new_fiber) { #ifdef CONFIG_ASAN - __sanitizer_start_switch_fiber(fake_stack_save, bottom, size); + if (action =3D=3D COROUTINE_TERMINATE) { + __sanitizer_start_switch_fiber( + action =3D=3D COROUTINE_TERMINATE ? NULL : fake_stack_save, + bottom, size); + } +#endif +#ifdef CONFIG_TSAN + void *curr_fiber =3D + __tsan_get_current_fiber(); + __tsan_acquire(curr_fiber); + + UC_TRACE("Current fiber: %p.", curr_fiber); + *fake_stack_save =3D curr_fiber; + UC_TRACE("Switch to fiber %p", new_fiber); + __tsan_switch_to_fiber(new_fiber, 0); /* 0=3Dsynchronize */ #endif } =20 static void coroutine_trampoline(int i0, int i1) { + UC_TRACE("Start trampoline"); union cc_arg arg; CoroutineUContext *self; Coroutine *co; @@ -104,21 +154,34 @@ static void coroutine_trampoline(int i0, int i1) =20 /* Initialize longjmp environment and switch back the caller */ if (!sigsetjmp(self->env, 0)) { - start_switch_fiber(&fake_stack_save, - leader.stack, leader.stack_size); + UC_TRACE("Current fiber: %p. Set co %p to env 0x%lx", + __tsan_get_current_fiber(), self, (unsigned long)self->en= v); + start_switch_fiber( + COROUTINE_YIELD, + &fake_stack_save, + leader.stack, + leader.stack_size, + self->tsan_caller_fiber); + UC_TRACE("Jump to co %p caller fiber %p env 0x%lx", + co, self->tsan_caller_fiber, *(unsigned long *)co->entry_= arg); siglongjmp(*(sigjmp_buf *)co->entry_arg, 1); } =20 + UC_TRACE("After first siglongjmp"); + finish_switch_fiber(fake_stack_save); =20 while (true) { co->entry(co->entry_arg); + UC_TRACE("switch from co %p to caller co %p fiber %p\n", + co, co->caller, self->tsan_caller_fiber); qemu_coroutine_switch(co, co->caller, COROUTINE_TERMINATE); } } =20 Coroutine *qemu_coroutine_new(void) { + UC_TRACE("Start new coroutine"); CoroutineUContext *co; ucontext_t old_uc, uc; sigjmp_buf old_env; @@ -154,12 +217,16 @@ Coroutine *qemu_coroutine_new(void) =20 arg.p =3D co; =20 + on_new_fiber(co); makecontext(&uc, (void (*)(void))coroutine_trampoline, 2, arg.i[0], arg.i[1]); =20 /* swapcontext() in, siglongjmp() back out */ if (!sigsetjmp(old_env, 0)) { - start_switch_fiber(&fake_stack_save, co->stack, co->stack_size); + start_switch_fiber( + COROUTINE_YIELD, + &fake_stack_save, + co->stack, co->stack_size, co->tsan_co_fiber); swapcontext(&old_uc, &uc); } =20 @@ -185,6 +252,7 @@ static inline void valgrind_stack_deregister(CoroutineU= Context *co) =20 void qemu_coroutine_delete(Coroutine *co_) { + UC_TRACE("Nuking co %p from orbit", co_); CoroutineUContext *co =3D DO_UPCAST(CoroutineUContext, base, co_); =20 #ifdef CONFIG_VALGRIND_H @@ -209,6 +277,10 @@ qemu_coroutine_switch(Coroutine *from_, Coroutine *to_, { CoroutineUContext *from =3D DO_UPCAST(CoroutineUContext, base, from_); CoroutineUContext *to =3D DO_UPCAST(CoroutineUContext, base, to_); + UC_TRACE("from to: %p %p uc: %p %p. fibers: %p %p caller fibers: %p %p= \n", + from_, to_, from, to, + from->tsan_co_fiber, to->tsan_co_fiber, + from->tsan_caller_fiber, to->tsan_caller_fiber); int ret; void *fake_stack_save =3D NULL; =20 @@ -216,8 +288,8 @@ qemu_coroutine_switch(Coroutine *from_, Coroutine *to_, =20 ret =3D sigsetjmp(from->env, 0); if (ret =3D=3D 0) { - start_switch_fiber(action =3D=3D COROUTINE_TERMINATE ? - NULL : &fake_stack_save, to->stack, to->stack_s= ize); + start_switch_fiber(action, &fake_stack_save, + to->stack, to->stack_size, to->tsan_co_fiber); siglongjmp(to->env, action); } =20 @@ -231,6 +303,13 @@ Coroutine *qemu_coroutine_self(void) if (!current) { current =3D &leader.base; } +#ifdef CONFIG_TSAN + if (!leader.tsan_co_fiber) { + leader.tsan_co_fiber =3D __tsan_get_current_fiber(); + UC_TRACE("For co %p set leader co fiber to %p", + current, leader.tsan_co_fiber); + } +#endif return current; } =20 --=20 2.17.1