| Message ID | 20200529132341.755-1-robert.foley@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add Thread Sanitizer support to QEMU | expand |
On 5/29/20 8:23 AM, Robert Foley wrote: > From: Lingfeng Yang <lfy@google.com> > > 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 [meta-comment] This message lacked References: and In-Reply-To: headers, making it the start of a new thread for patches 1-11. But I also see you sent a 0/12 message with Message-Id: <20200529132143.702-1-robert.foley@linaro.org>, as well as an unthreaded 12/12 with Message-Id: <20200529132438.837-1-robert.foley@linaro.org>. You may want to figure out why your sending workflow is not preserving desired threading.
On Fri, 29 May 2020 at 09:51, Eric Blake <eblake@redhat.com> wrote: > > On 5/29/20 8:23 AM, Robert Foley wrote: > > From: Lingfeng Yang <lfy@google.com> > > > > 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 > > [meta-comment] > > This message lacked References: and In-Reply-To: headers, making it the > start of a new thread for patches 1-11. But I also see you sent a 0/12 > message with Message-Id: <20200529132143.702-1-robert.foley@linaro.org>, > as well as an unthreaded 12/12 with Message-Id: > <20200529132438.837-1-robert.foley@linaro.org>. You may want to figure > out why your sending workflow is not preserving desired threading. Thanks for pointing this out. I see what happened here and will fix it for next time. Thanks, -Rob > -- > Eric Blake, Principal Software Engineer > Red Hat, Inc. +1-919-301-3226 > Virtualization: qemu.org | libvirt.org >
Robert Foley <robert.foley@linaro.org> writes: > From: Lingfeng Yang <lfy@google.com> > > 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 annotated > 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=clang-9 --cxx=clang++-9 --disable-werror' > configure flags. > > Signed-off-by: Lingfeng Yang <lfy@google.com> > Signed-off-by: Emilio G. Cota <cota@braap.org> > [cota: minor modifications + configure changes] > Signed-off-by: Robert Foley <robert.foley@linaro.org> > [RF: Error out in configure if tsan not available, fix checkpatch warnings] > --- > configure | 41 +++++++++++++++++ > util/coroutine-ucontext.c | 97 +++++++++++++++++++++++++++++++++++---- > 2 files changed, 129 insertions(+), 9 deletions(-) > > diff --git a/configure b/configure > index b969dee675..c18efae65e 100755 > --- a/configure > +++ b/configure > @@ -395,6 +395,7 @@ gprof="no" > debug_tcg="no" > debug="no" > sanitizers="no" > +tsan="no" > fortify_source="" > strip_opt="yes" > tcg_interpreter="no" > @@ -1150,6 +1151,10 @@ for opt do > ;; > --disable-sanitizers) sanitizers="no" > ;; > + --enable-tsan) tsan="yes" > + ;; > + --disable-tsan) tsan="no" > + ;; > --enable-sparse) sparse="yes" > ;; > --disable-sparse) sparse="no" > @@ -1750,6 +1755,7 @@ Advanced options (experts only): > --with-pkgversion=VERS use specified string as sub-version of the package > --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 +6198,27 @@ if test "$fuzzing" = "yes" ; then > fi > fi > > +# Thread sanitizer is, for now, much noisier than the other sanitizers; > +# keep it separate until that is not the case. I think we also need to stop both being enabled at once. On my clang-9 setup I get: make: *** [qapi/qobject-output-visitor.o] Error 1 clang: error: invalid argument '-fsanitize=address' not allowed with '-fsanitize=thread' clang: error: invalid argument '-fsanitize=address' not allowed with '-fsanitize=thread' clang: errorclang: : errorinvalid argument '-fsanitize=address' not allowed with '-fsanitize=thread': invalid argument '-fsanitize=address' not allowed with '-fsanitize=thread' clang: error: invalid argument '-fsanitize=address' not allowed with '-fsanitize=thread' > +have_tsan=no > +have_tsan_iface_fiber=no > +if test "$tsan" = "yes" ; then > + write_c_skeleton > + if compile_prog "$CPU_CFLAGS -Werror -fsanitize=thread" "" ; then > + have_tsan=yes > + fi > + cat > $TMPC << EOF > +#include <sanitizer/tsan_interface.h> > +int main(void) { > + __tsan_create_fiber(0); > + return 0; > +} > +EOF > + if compile_prog "$CPU_CFLAGS -Werror -fsanitize=thread" "" ; then > + have_tsan_iface_fiber=yes > + fi > +fi > + > ########################################## > # check for libpmem > > @@ -6293,6 +6320,16 @@ if test "$have_asan" = "yes"; then > "Without code annotation, the report may be inferior." > fi > fi > +if test "$have_tsan" = "yes" ; then > + if test "$have_tsan_iface_fiber" = "yes" ; then > + QEMU_CFLAGS="-fsanitize=thread $QEMU_CFLAGS" > + QEMU_LDFLAGS="-fsanitize=thread $QEMU_LDFLAGS" > + else > + error_exit "Cannot enable TSAN due to missing fiber annotation interface." > + fi > +elif test "$tsan" = "yes" ; then > + error_exit "Cannot enable TSAN due to missing sanitize thread interface." > +fi > if test "$have_ubsan" = "yes"; then > QEMU_CFLAGS="-fsanitize=undefined $QEMU_CFLAGS" > QEMU_LDFLAGS="-fsanitize=undefined $QEMU_LDFLAGS" > @@ -7382,6 +7419,10 @@ if test "$have_asan_iface_fiber" = "yes" ; then > echo "CONFIG_ASAN_IFACE_FIBER=y" >> $config_host_mak > fi Are we missing any LDFLAGS? On Ubuntu 18.04 with clang-9 I'm seeing: LINK qemu-ga /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.tsan-x86_64.a(tsan_rtl_amd64.S.o): warning: common of `__interception::real_setjmp' overridden by definition /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.tsan-x86_64.a(tsan_interceptors.cc.o): warning: defined here /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.tsan-x86_64.a(tsan_rtl_amd64.S.o): warning: common of `__interception::real__setjmp' overridden by definition /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.tsan-x86_64.a(tsan_interceptors.cc.o): warning: defined here /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.tsan-x86_64.a(tsan_rtl_amd64.S.o): warning: common of `__interception::real_sigsetjmp' overridden by definition /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.tsan-x86_64.a(tsan_interceptors.cc.o): warning: defined here /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.tsan-x86_64.a(tsan_rtl_amd64.S.o): warning: common of `__interception::real___sigsetjmp' overridden by definition /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.tsan-x86_64.a(tsan_interceptors.cc.o): warning: defined here libqemuutil.a(osdep.o):/usr/lib/llvm-9/lib/clang/9.0.0/include/sanitizer/tsan_interface.h:41: multiple definition of `__tsan_mutex_linker_init' libqemuutil.a(control.o):/usr/lib/llvm-9/lib/clang/9.0.0/include/sanitizer/tsan_interface.h:41: first defined here libqemuutil.a(osdep.o):/usr/lib/llvm-9/lib/clang/9.0.0/include/sanitizer/tsan_interface.h:50: multiple definition of `__tsan_mutex_not_static' libqemuutil.a(control.o):/usr/lib/llvm-9/lib/clang/9.0.0/include/sanitizer/tsan_interface.h:50: first defined here libqemuutil.a(osdep.o):/usr/lib/llvm-9/lib/clang/9.0.0/include/sanitizer/tsan_interface.h:55: multiple definition of `__tsan_mutex_read_lock' libqemuutil.a(control.o):/usr/lib/llvm-9/lib/clang/9.0.0/include/sanitizer/tsan_interface.h:55: first defined here libqemuutil.a(osdep.o):/usr/lib/llvm-9/lib/clang/9.0.0/include/sanitizer/tsan_interface.h:45: multiple definition of `__tsan_mutex_read_reentrant' libqemuutil.a(control.o):/usr/lib/llvm-9/lib/clang/9.0.0/include/sanitizer/tsan_interface.h:45: first defined here libqemuutil.a(osdep.o):/usr/lib/llvm-9/lib/clang/9.0.0/include/sanitizer/tsan_interface.h:64: multiple definition of `__tsan_mutex_recursive_lock' libqemuutil.a(control.o):/usr/lib/llvm-9/lib/clang/9.0.0/include/sanitizer/tsan_interface.h:64: first defined here libqemuutil.a(osdep.o):/usr/lib/llvm-9/lib/clang/9.0.0/include/sanitizer/tsan_interface.h:68: multiple definition of `__tsan_mutex_recursive_unlock' <snip>
On Tue, 2 Jun 2020 at 15:22, Alex Bennée <alex.bennee@linaro.org> wrote: > > > Robert Foley <robert.foley@linaro.org> writes: > > > From: Lingfeng Yang <lfy@google.com> <snip> > > > > +# Thread sanitizer is, for now, much noisier than the other sanitizers; > > +# keep it separate until that is not the case. > > I think we also need to stop both being enabled at once. On my clang-9 > setup I get: > > make: *** [qapi/qobject-output-visitor.o] Error 1 > clang: error: invalid argument '-fsanitize=address' not allowed with '-fsanitize=thread' > clang: error: invalid argument '-fsanitize=address' not allowed with '-fsanitize=thread' > clang: errorclang: : errorinvalid argument '-fsanitize=address' not allowed with '-fsanitize=thread': > invalid argument '-fsanitize=address' not allowed with '-fsanitize=thread' > clang: error: invalid argument '-fsanitize=address' not allowed with '-fsanitize=thread' Good point. I see a similar error if I use --enable-sanitizers and --enable-tsan. Will look to add an error check for this. Wondering if there are any other interactions we need to avoid? Will poke around a bit here. <snip> > > Are we missing any LDFLAGS? On Ubuntu 18.04 with clang-9 I'm seeing: > > LINK qemu-ga > /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.tsan-x86_64.a(tsan_rtl_amd64.S.o): warning: common of `__interception::real_setjmp' overridden by definition > /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.tsan-x86_64.a(tsan_interceptors.cc.o): warning: defined here Looks like these warnings come from use of --warn-common, so I think we need to exclude this when using TSan if we want to silence these warnings from the TSan libraries. Thanks & Regards, -Rob > /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.tsan-x86_64.a(tsan_rtl_amd64.S.o): warning: common of `__interception::real__setjmp' overridden by definition > /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.tsan-x86_64.a(tsan_interceptors.cc.o): warning: defined here > /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.tsan-x86_64.a(tsan_rtl_amd64.S.o): warning: common of `__interception::real_sigsetjmp' overridden by definition > /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.tsan-x86_64.a(tsan_interceptors.cc.o): warning: defined here > /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.tsan-x86_64.a(tsan_rtl_amd64.S.o): warning: common of `__interception::real___sigsetjmp' overridden by definition > /usr/lib/llvm-9/lib/clang/9.0.0/lib/linux/libclang_rt.tsan-x86_64.a(tsan_interceptors.cc.o): warning: defined here > libqemuutil.a(osdep.o):/usr/lib/llvm-9/lib/clang/9.0.0/include/sanitizer/tsan_interface.h:41: multiple definition of `__tsan_mutex_linker_init' > libqemuutil.a(control.o):/usr/lib/llvm-9/lib/clang/9.0.0/include/sanitizer/tsan_interface.h:41: first defined here > libqemuutil.a(osdep.o):/usr/lib/llvm-9/lib/clang/9.0.0/include/sanitizer/tsan_interface.h:50: multiple definition of `__tsan_mutex_not_static' > libqemuutil.a(control.o):/usr/lib/llvm-9/lib/clang/9.0.0/include/sanitizer/tsan_interface.h:50: first defined here > libqemuutil.a(osdep.o):/usr/lib/llvm-9/lib/clang/9.0.0/include/sanitizer/tsan_interface.h:55: multiple definition of `__tsan_mutex_read_lock' > libqemuutil.a(control.o):/usr/lib/llvm-9/lib/clang/9.0.0/include/sanitizer/tsan_interface.h:55: first defined here > libqemuutil.a(osdep.o):/usr/lib/llvm-9/lib/clang/9.0.0/include/sanitizer/tsan_interface.h:45: multiple definition of `__tsan_mutex_read_reentrant' > libqemuutil.a(control.o):/usr/lib/llvm-9/lib/clang/9.0.0/include/sanitizer/tsan_interface.h:45: first defined here > libqemuutil.a(osdep.o):/usr/lib/llvm-9/lib/clang/9.0.0/include/sanitizer/tsan_interface.h:64: multiple definition of `__tsan_mutex_recursive_lock' > libqemuutil.a(control.o):/usr/lib/llvm-9/lib/clang/9.0.0/include/sanitizer/tsan_interface.h:64: first defined here > libqemuutil.a(osdep.o):/usr/lib/llvm-9/lib/clang/9.0.0/include/sanitizer/tsan_interface.h:68: multiple definition of `__tsan_mutex_recursive_unlock' > > <snip> > > -- > Alex Bennée
diff --git a/configure b/configure index b969dee675..c18efae65e 100755 --- a/configure +++ b/configure @@ -395,6 +395,7 @@ gprof="no" debug_tcg="no" debug="no" sanitizers="no" +tsan="no" fortify_source="" strip_opt="yes" tcg_interpreter="no" @@ -1150,6 +1151,10 @@ for opt do ;; --disable-sanitizers) sanitizers="no" ;; + --enable-tsan) tsan="yes" + ;; + --disable-tsan) tsan="no" + ;; --enable-sparse) sparse="yes" ;; --disable-sparse) sparse="no" @@ -1750,6 +1755,7 @@ Advanced options (experts only): --with-pkgversion=VERS use specified string as sub-version of the package --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 +6198,27 @@ if test "$fuzzing" = "yes" ; then fi fi +# Thread sanitizer is, for now, much noisier than the other sanitizers; +# keep it separate until that is not the case. +have_tsan=no +have_tsan_iface_fiber=no +if test "$tsan" = "yes" ; then + write_c_skeleton + if compile_prog "$CPU_CFLAGS -Werror -fsanitize=thread" "" ; then + have_tsan=yes + fi + cat > $TMPC << EOF +#include <sanitizer/tsan_interface.h> +int main(void) { + __tsan_create_fiber(0); + return 0; +} +EOF + if compile_prog "$CPU_CFLAGS -Werror -fsanitize=thread" "" ; then + have_tsan_iface_fiber=yes + fi +fi + ########################################## # check for libpmem @@ -6293,6 +6320,16 @@ if test "$have_asan" = "yes"; then "Without code annotation, the report may be inferior." fi fi +if test "$have_tsan" = "yes" ; then + if test "$have_tsan_iface_fiber" = "yes" ; then + QEMU_CFLAGS="-fsanitize=thread $QEMU_CFLAGS" + QEMU_LDFLAGS="-fsanitize=thread $QEMU_LDFLAGS" + else + error_exit "Cannot enable TSAN due to missing fiber annotation interface." + fi +elif test "$tsan" = "yes" ; then + error_exit "Cannot enable TSAN due to missing sanitize thread interface." +fi if test "$have_ubsan" = "yes"; then QEMU_CFLAGS="-fsanitize=undefined $QEMU_CFLAGS" QEMU_LDFLAGS="-fsanitize=undefined $QEMU_LDFLAGS" @@ -7382,6 +7419,10 @@ if test "$have_asan_iface_fiber" = "yes" ; then echo "CONFIG_ASAN_IFACE_FIBER=y" >> $config_host_mak fi +if test "$have_tsan" = "yes" && test "$have_tsan_iface_fiber" = "yes" ; then + echo "CONFIG_TSAN=y" >> $config_host_mak +fi + if test "$has_environ" = "yes" ; then echo "CONFIG_HAS_ENVIRON=y" >> $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 +#ifdef CONFIG_TSAN +#include <sanitizer/tsan_interface.h> +#endif + typedef struct { Coroutine base; void *stack; size_t stack_size; sigjmp_buf env; + void *tsan_co_fiber; + void *tsan_caller_fiber; + #ifdef CONFIG_VALGRIND_H unsigned int valgrind_stack_id; #endif } CoroutineUContext; +#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]; }; -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 = __tsan_create_fiber(0); /* flags: sync on switch */ + co->tsan_caller_fiber = __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 = size_old; } #endif +#ifdef CONFIG_TSAN + if (fake_stack_save) { + __tsan_release(fake_stack_save); + __tsan_switch_to_fiber(fake_stack_save, 0); /* 0=synchronize */ + } +#endif } -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 == COROUTINE_TERMINATE) { + __sanitizer_start_switch_fiber( + action == COROUTINE_TERMINATE ? NULL : fake_stack_save, + bottom, size); + } +#endif +#ifdef CONFIG_TSAN + void *curr_fiber = + __tsan_get_current_fiber(); + __tsan_acquire(curr_fiber); + + UC_TRACE("Current fiber: %p.", curr_fiber); + *fake_stack_save = curr_fiber; + UC_TRACE("Switch to fiber %p", new_fiber); + __tsan_switch_to_fiber(new_fiber, 0); /* 0=synchronize */ #endif } 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) /* 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->env); + 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); } + UC_TRACE("After first siglongjmp"); + finish_switch_fiber(fake_stack_save); 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); } } 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) arg.p = co; + on_new_fiber(co); makecontext(&uc, (void (*)(void))coroutine_trampoline, 2, arg.i[0], arg.i[1]); /* 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); } @@ -185,6 +252,7 @@ static inline void valgrind_stack_deregister(CoroutineUContext *co) void qemu_coroutine_delete(Coroutine *co_) { + UC_TRACE("Nuking co %p from orbit", co_); CoroutineUContext *co = DO_UPCAST(CoroutineUContext, base, co_); #ifdef CONFIG_VALGRIND_H @@ -209,6 +277,10 @@ qemu_coroutine_switch(Coroutine *from_, Coroutine *to_, { CoroutineUContext *from = DO_UPCAST(CoroutineUContext, base, from_); CoroutineUContext *to = 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 = NULL; @@ -216,8 +288,8 @@ qemu_coroutine_switch(Coroutine *from_, Coroutine *to_, ret = sigsetjmp(from->env, 0); if (ret == 0) { - start_switch_fiber(action == COROUTINE_TERMINATE ? - NULL : &fake_stack_save, to->stack, to->stack_size); + start_switch_fiber(action, &fake_stack_save, + to->stack, to->stack_size, to->tsan_co_fiber); siglongjmp(to->env, action); } @@ -231,6 +303,13 @@ Coroutine *qemu_coroutine_self(void) if (!current) { current = &leader.base; } +#ifdef CONFIG_TSAN + if (!leader.tsan_co_fiber) { + leader.tsan_co_fiber = __tsan_get_current_fiber(); + UC_TRACE("For co %p set leader co fiber to %p", + current, leader.tsan_co_fiber); + } +#endif return current; }