216837 2009-11-30 17:56:01 +0000 drd/tests/pth_cond_destroy_busy fails on OS X 2026-03-12 12:34:25 +0000 1 1 6 Developer tools valgrind vex 3.5 SVN Unlisted Binaries macOS ASSIGNED NOR normal --- 1 glider pjfloyd bart.vanassche+kde bdheller dmaclach gparker halilsen johan.walles konstantin.s.serebryany n.nethercote pjfloyd rhyskidd timurrrr 51 oldest_to_newest 871286 0 38721 glider 2009-11-30 17:56:01 +0000 Created attachment 38721 A reproducer of the VEX threading instrumentation problem on Mac OS (My uname -a says: Darwin mcgrind 9.7.0 Darwin Kernel Version 9.7.0: Tue Mar 31 22:52:17 PDT 2009; root:xnu-1228.12.14~1/RELEASE_I386 i386) To reproduce the problem, compile the attached source file using: g++ worker_vex_test.mm -framework Foundation and run Helgrind and/or DRD with the runtime assertions enabled on the resulting binary (see worker_vex_test.{helgrind,drd}.log for my logs). For some reason both tools end up trying to operate with an uninitialized thread, i.e. either VG_(running_tid) returns an incorrect result or the thread creation is instrumented incorrectly. The reproducer is quite large (it's a part of the Chromium source code, taken from www.chromium.org). I'm working on a smaller one. There is a number of Chromium tests that hit the same issue, but they're far more complicated. 871287 1 38722 glider 2009-11-30 17:57:41 +0000 Created attachment 38722 The log of running Helgrind on the supplied program. The Helgrind log. 871291 2 38723 glider 2009-11-30 18:03:00 +0000 Created attachment 38723 The log of running DRD -v on the supplied program. Note the "drd_pre_thread_create", "drd_post_thread_create" and "leaving drd_post_thread_create" lines in the log. I've patched DRD a little so that it prints "drd_pre_thread_create" and "drd_post_thread_create" entering the corresponding functions and "leaving drd_post_thread_create" leaving leaving drd_post_thread_create(). This change does not affect DRD's functionality. 871293 3 38724 glider 2009-11-30 18:04:13 +0000 Created attachment 38724 The log of running Helgrind -v on the supplied program. (replaced the previous Helgrind log with a more verbose one) 871784 4 38744 glider 2009-12-01 17:15:55 +0000 Created attachment 38744 A smaller reproducer -- (only 1400 lines instead of 9k) Added a smaller and more readable reproducer. If someone can verify that the bug is reproducible for him, I'd appreciate that. Thanks! 873449 5 konstantin.s.serebryany 2009-12-04 18:00:31 +0000 This also affects ThreadSanitizer in the same way 876638 6 38949 glider 2009-12-09 18:21:11 +0000 Created attachment 38949 A 72-line reproducer exploiting NSOperationQueue Another reproducer that uses only NSOperationQueue. Build: $ g++ nsop.mm -o nsop -framework Foundation 885500 7 39290 glider 2009-12-23 16:55:15 +0000 Created attachment 39290 A small attachment that uses only NSOperationQueue The attached code exploits NSOperationQueue from the Foundation library. To build it, just run: $ g++ nsop.mm -o nsop -framework Foundation If I run ./nsop natively, I get something like: 2009-12-09 19:58:33.021 nsop[64614:10b] *** _NSAutoreleaseNoPool(): Object 0x106580 of class __NSFastEnumerationEnumerator autoreleased with no pool in place - just leaking Stack: (0x92a01f0f 0x9290e442 0x929a41d2 0x929a4597) 2009-12-09 19:58:33.022 nsop[64614:10b] *** _NSAutoreleaseNoPool(): Object 0x10c490 of class NSCFSet autoreleased with no pool in place - just leaking Stack: (0x92a01f0f 0x9290e442 0x92926e63 0x92926b3c 0x929267b8 0x92926493 0x92926242 0x92925e3e 0x929a420f 0x929a4597) 2009-12-09 19:58:33.022 nsop[64614:10b] *** _NSAutoreleaseNoPool(): Object 0x10ce40 of class NSCFSet autoreleased with no pool in place - just leaking Stack: (0x92a01f0f 0x9290e442 0x92926e63 0x92926b3c 0x929267b8 0x92926493 0x92926242 0x92925e3e 0x929a420f 0x929a4597) Printer::Print() BYE Task::Run() But neither DRD nor Helgrind cannot cope with this binary: $ inst/bin/valgrind --tool=drd /Users/glider/src/worker_vex_test/nsop 2>&1 ==68403== drd, a thread error detector ... --68403-- /Users/glider/src/worker_vex_test/nsop: --68403-- dSYM directory is missing; consider using --dsymutil=yes 2009-12-09 20:02:14.368 nsop[68403:50b] *** _NSAutoreleaseNoPool(): Object 0x1cb4d40 of class __NSFastEnumerationEnumerator autoreleased with no pool in place - just leaking Stack: (0x4d1f0f 0x3de442 0x4741d2 0x474597) 2009-12-09 20:02:14.617 nsop[68403:50b] *** _NSAutoreleaseNoPool(): Object 0x1cbcff0 of class NSCFSet autoreleased with no pool in place - just leaking Stack: (0x4d1f0f 0x3de442 0x3f6e63 0x3f6b3c 0x3f67b8 0x3f6493 0x3f6242 0x3f5e3e 0x47420f 0x474597) 2009-12-09 20:02:14.659 nsop[68403:50b] *** _NSAutoreleaseNoPool(): Object 0x1cc12e0 of class NSCFSet autoreleased with no pool in place - just leaking Stack: (0x4d1f0f 0x3de442 0x3f6e63 0x3f6b3c 0x3f67b8 0x3f6493 0x3f6242 0x3f5e3e 0x47420f 0x474597) drd: drd_thread.c:584 (vgDrd_thread_set_vg_running_tid): Assertion 'vg_tid != VG_INVALID_THREADID' failed. ==68403== at 0xF009DCBD: ??? ==68403== by 0xF009DF71: ??? ... sched status: running_tid=0 Thread 1: status = VgTs_WaitSys ==68403== at 0x7DDC62: ioctl (in /usr/lib/libSystem.B.dylib) ==68403== by 0x7EB00A: __smakebuf (in /usr/lib/libSystem.B.dylib) ==68403== by 0x7EAF0C: __swsetup (in /usr/lib/libSystem.B.dylib) ==68403== by 0x7BAF8D: __sfvwrite (in /usr/lib/libSystem.B.dylib) ==68403== by 0x82618F: puts (in /usr/lib/libSystem.B.dylib) ==68403== by 0x1D0E: Printer::Print() (in /Users/glider/src/worker_vex_test/nsop) ==68403== by 0x1BAD: main (in /Users/glider/src/worker_vex_test/nsop) Thread 2: status = VgTs_Init ==68403== at 0x81E2A4: start_wqthread (in /usr/lib/libSystem.B.dylib) Looks like Valgrind tries to execute code in a previously unknown thread without calling the pre_thread_ll_create method for this thread. 903416 8 jseward 2010-01-22 13:59:33 +0000 > Looks like Valgrind tries to execute code in a previously unknown > thread without calling the pre_thread_ll_create method for this > thread. Yes. So this has something to do with the wqthread_hijack nastyness, which is a MacOS-specific thread creation intercept hook. I'll take a look. 926807 9 jseward 2010-03-01 18:48:40 +0000 I can reproduce it with the most recent test case, yes. The patch below stops Helgrind asserting, by sending it the thread_ll_create event to tell it the thread has come into existence. DRD still asserts, for reasons which I'm not sure about. I think it's something to do with the thread_first_insn event, which DRD listens for but Helgrind ignores. Bart, can you have a look? Note however that this is still way wrong, as per comments in the patch, because we need to know the parent thread, but we don't. Maybe GregP knows a way figure out what the parent thread is here. Index: coregrind/m_syswrap/syswrap-x86-darwin.c =================================================================== --- coregrind/m_syswrap/syswrap-x86-darwin.c (revision 11058) +++ coregrind/m_syswrap/syswrap-x86-darwin.c (working copy) @@ -420,6 +420,16 @@ vex = &tst->arch.vex; allocstack(tst->tid); LibVEX_GuestX86_initialise(vex); + /* Tell threading tools the new thread exists. FIXME: we need + to know the identity (tid) of the parent thread, in order + that threading tools can make a dependency edge from it to + this thread. But we don't know what the parent thread is. + Hence pass 1 (the root thread). This is completely wrong in + general, and could cause large numbers of false races to be + reported. In fact, it's positively dangerous; we don't even + know if thread 1 is still alive, and the thread checkers are + likely to assert if it isn't. */ + VG_TRACK(pre_thread_ll_create, 1/*BOGUS*/, tst->tid); } // Set thread's registers @@ -461,8 +471,12 @@ tst->client_stack_highest_word = stack+stacksize; tst->client_stack_szB = stacksize; - // GrP fixme scheduler lock?! - + // tell the tool that we are at a point after the new thread + // has its registers set up (so we can take a stack snapshot), + // but before it has executed any instructions (or, really, + // before it has done any memory references). + VG_TRACK(pre_thread_first_insn, tst->tid); + // pthread structure ML_(notify_core_and_tool_of_mmap)( stack+stacksize, pthread_structsize, 926855 10 bart.vanassche+kde 2010-03-01 20:43:27 +0000 (In reply to comment #9) > I can reproduce it with the most recent test case, yes. > > The patch below stops Helgrind asserting, by sending it the > thread_ll_create event to tell it the thread has come into existence. > DRD still asserts, for reasons which I'm not sure about. I think it's > something to do with the thread_first_insn event, which DRD listens > for but Helgrind ignores. Bart, can you have a look? As you can see below, DRD sometimes reports an assertion failure for at least the test program that uses only NSOperationQueue. The reported assertion failure means that one of the following Valgrind client requests has been invoked by the Valgrind core with VG_(get_running_tid)() == VG_INVALID_THREADID, which is an inconsistency in the Valgrind core: * post_mem_write * new_mmap * new_mem_startup * new_mem_stack_signal $ ./vg-in-place --tool=drd --read-var-info=yes --trace-fork-join=yes ~/valgrind-bug-216837/NSOperationQueueOnly ==19250== drd, a thread error detector ==19250== Copyright (C) 2006-2009, and GNU GPL'd, by Bart Van Assche. ==19250== Using Valgrind-3.6.0.SVN and LibVEX; rerun with -h for copyright info ==19250== Command: /Users/bart/valgrind-bug-216837/NSOperationQueueOnly ==19250== --19250-- drd_pre_thread_create creator = 0, created = 1 --19250-- drd_post_thread_create created = 1 2010-03-01 11:34:54.771 NSOperationQueueOnly[19250:50b] *** _NSAutoreleaseNoPool(): Object 0x1bf92d0 of class __NSFastEnumerationEnumerator autoreleased with no pool in place - just leaking Stack: (0x4ce12f 0x3daec2 0x470512 0x4708d7) 2010-03-01 11:34:55.048 NSOperationQueueOnly[19250:50b] *** _NSAutoreleaseNoPool(): Object 0x1c01400 of class NSCFSet autoreleased with no pool in place - just leaking Stack: (0x4ce12f 0x3daec2 0x3f35b3 0x3f328c 0x3f2f08 0x3f2be3 0x3f2992 0x3f258e 0x47054f 0x4708d7) 2010-03-01 11:34:55.103 NSOperationQueueOnly[19250:50b] *** _NSAutoreleaseNoPool(): Object 0x1c05a40 of class NSCFSet autoreleased with no pool in place - just leaking Stack: (0x4ce12f 0x3daec2 0x3f35b3 0x3f328c 0x3f2f08 0x3f2be3 0x3f2992 0x3f258e 0x47054f 0x4708d7) --19250-- drd_pre_thread_create creator = 1, created = 2 --19250-- drd_post_thread_create created = 2 drd: drd_thread.c:584 (vgDrd_thread_set_vg_running_tid): Assertion 'vg_tid != VG_INVALID_THREADID' failed. ==19250== at 0xF009E0D5: ??? ==19250== by 0xF009E298: ??? ==19250== by 0xF008B985: ??? ==19250== by 0xF00940D8: ??? ==19250== by 0xF0125F7A: ??? sched status: running_tid=0 Thread 1: status = VgTs_WaitSys ==19250== at 0x7D73E2: ioctl (in /usr/lib/libSystem.B.dylib) ==19250== by 0x7E5386: __smakebuf (in /usr/lib/libSystem.B.dylib) ==19250== by 0x7E5288: __swsetup (in /usr/lib/libSystem.B.dylib) ==19250== by 0x7B46ED: __sfvwrite (in /usr/lib/libSystem.B.dylib) ==19250== by 0x820510: puts (in /usr/lib/libSystem.B.dylib) ==19250== by 0x1D2E: Printer::Print() (NSOperationQueueOnly.mm:7) ==19250== by 0x1CB7: main (NSOperationQueueOnly.mm:68) Thread 2: status = VgTs_Init ==19250== at 0x8185D8: start_wqthread (in /usr/lib/libSystem.B.dylib) 927110 11 glider 2010-03-02 11:29:02 +0000 > Note however that this is still way wrong, as per comments in the > patch, because we need to know the parent thread, but we don't. Maybe > GregP knows a way figure out what the parent thread is here. > A possible solution would be to track each workqueue in the threading tool itself and keep the list of the parent threads of the tasks put into the queue (I'm assuming workqueues are real queues, aren't they?) 927250 12 glider 2010-03-02 17:47:25 +0000 I've experimented with several tasks posted into the same workqueue. Looks like they can be executed in a random order (not necessarily the creation order). Also, workq_ops doesn't have any parameter respecting the NSOperationQueue object that was used to post the task, i.e. IIUC all the tasks end up in a same global queue. 927274 13 glider 2010-03-02 18:49:40 +0000 I've also modified nsop.mm to generate ten tasks on two workqueues, queue1 and queue2. Each of the tasks printed its ID (even for queue1, odd for queue2) and got the following log running ThreadSanitizer with the --trace-syscalls=yes flag (grepped for "workq_\|Task"): SYSCALL[73641,1](unix:367) workq_open()[sync] --> Success(0x16f:0x0) SYSCALL[73641,1](unix:368) workq_ops( 1(QUEUE_ADD), 0x21a50000, 0 )TID: 1 SYSCALL[73641,1](unix:368) workq_ops( 1(QUEUE_ADD), 0x21a50018, 0 )TID: 1 SYSCALL[73641,1](unix:368) workq_ops( 1(QUEUE_ADD), 0x21a50030, 0 )TID: 1 SYSCALL[73641,1](unix:368) workq_ops( 1(QUEUE_ADD), 0x21a50048, 0 )TID: 1 SYSCALL[73641,1](unix:368) workq_ops( 1(QUEUE_ADD), 0x21a50060, 0 )TID: 1 SYSCALL[73641,1](unix:368) workq_ops( 1(QUEUE_ADD), 0x21a50078, 0 )TID: 1 SYSCALL[73641,1](unix:368) workq_ops( 1(QUEUE_ADD), 0x21a50090, 0 )TID: 1 SYSCALL[73641,1](unix:368) workq_ops( 1(QUEUE_ADD), 0x21a500a8, 0 )TID: 1 SYSCALL[73641,1](unix:368) workq_ops( 1(QUEUE_ADD), 0x21a500c0, 0 )TID: 1 SYSCALL[73641,1](unix:368) workq_ops( 1(QUEUE_ADD), 0x21a500d8, 0 )TID: 1 SYSCALL[73641,2](unix:368) workq_ops( 2(QUEUE_REMOVE), 0x21a50000, 0 )TID: 2 SYSCALL[73641,2](unix:368) workq_ops( 4(THREAD_RETURN), 0x0, 0 )TID: 2 SYSCALL[73641,5](unix:368) workq_ops( 2(QUEUE_REMOVE), 0x21a50018, 0 )TID: 5 SYSCALL[73641,5](unix:368) workq_ops( 4(THREAD_RETURN), 0x0, 0 )TID: 5 SYSCALL[73641,4](unix:368) workq_ops( 2(QUEUE_REMOVE), 0x21a50078, 0 )TID: 4 SYSCALL[73641,4](unix:368) workq_ops( 4(THREAD_RETURN), 0x0, 0 )TID: 4 SYSCALL[73641,6](unix:368) workq_ops( 2(QUEUE_REMOVE), 0x21a50060, 0 )TID: 6 SYSCALL[73641,6](unix:368) workq_ops( 4(THREAD_RETURN), 0x0, 0 )TID: 6 SYSCALL[73641,3](unix:368) workq_ops( 2(QUEUE_REMOVE), 0x21a50048, 0 )TID: 3 SYSCALL[73641,3](unix:368) workq_ops( 4(THREAD_RETURN), 0x0, 0 )TID: 3 SYSCALL[73641,7](unix:368) workq_ops( 2(QUEUE_REMOVE), 0x21a50030, 0 )TID: 7 SYSCALL[73641,7](unix:368) workq_ops( 4(THREAD_RETURN), 0x0, 0 )TID: 7 SYSCALL[73641,8](unix:368) workq_ops( 2(QUEUE_REMOVE), 0x21a50090, 0 )TID: 8 SYSCALL[73641,8](unix:368) workq_ops( 4(THREAD_RETURN), 0x0, 0 )TID: 8 SYSCALL[73641,2](unix:368) workq_ops() starting new workqueue item SYSCALL[73641,2](unix:368) workq_ops( 2(QUEUE_REMOVE), 0x21a500a8, 0 )TID: 2 SYSCALL[73641,2](unix:368) workq_ops( 4(THREAD_RETURN), 0x0, 0 )TID: 2 SYSCALL[73641,10](unix:368) workq_ops( 2(QUEUE_REMOVE), 0x21a500c0, 0 )TID: 10 SYSCALL[73641,10](unix:368) workq_ops( 4(THREAD_RETURN), 0x0, 0 )TID: 10 SYSCALL[73641,9](unix:368) workq_ops( 2(QUEUE_REMOVE), 0x21a500d8, 0 )TID: 9 SYSCALL[73641,9](unix:368) workq_ops( 4(THREAD_RETURN), 0x0, 0 )TID: 9 Inside Task::Run(), id=0 Inside Task::Run(), id=1 Inside Task::Run(), id=5 Inside Task::Run(), id=4 Inside Task::Run(), id=3 Inside Task::Run(), id=2 Inside Task::Run(), id=6 Inside Task::Run(), id=7 Inside Task::Run(), id=8 Inside Task::Run(), id=9 That is, keeping a list of shadow pthread_workitem_t's used in workq_ops we are able to track the parent ID within Valgrind and pass it to the clients after the thread starts execution. 927283 14 jseward 2010-03-02 19:04:21 +0000 (In reply to comment #13) > That is, keeping a list of shadow pthread_workitem_t's used in > workq_ops we are able to track the parent ID within Valgrind and > pass it to the clients after the thread starts execution. Do you mean, it should in theory be possible, or do you have a patch that does this now? 927549 15 glider 2010-03-03 10:16:52 +0000 I'll try making a patch soon. 928197 16 glider 2010-03-04 11:37:47 +0000 The patch below adds the track_pre_wqthread_ll_create function to the tooliface (it also includes your patch). This was enough for me to (probably) add the support for wqthreads in ThreadSanitizer. To handle wqthreads properly, a tool doesn't need to know the parent TID of the worker thread. Instead, it should draw a happens-before arc between the place where the task is put into the queue (this is "workq_ops(1, workitem)") and the place where the task actually starts (surprisingly, this is not "workq_ops(2, workitem)", that's why we have to introduce a call to track_pre_wqthread_ll_create into wqthread_hijack). So the tool should intercept workq_ops in order to place SIGNAL(workitem) and define the track_pre_wqthread_ll_create handler to place WAIT(workitem). I've got a concern about where actually to put the VG_TRACK(pre_wqthread_ll_create) call inside wqthread_hijack, but the current place looks good. Also, the name "pre_wqthread_ll_create" was picked randomly and doesn't reflect its purpose well. Maybe something like "pre_workqueue_task_start" is better. Index: include/pub_tool_tooliface.h =================================================================== --- include/pub_tool_tooliface.h (revision 11055) +++ include/pub_tool_tooliface.h (working copy) @@ -656,6 +656,7 @@ ll_exit (in the child's context) */ void VG_(track_pre_thread_ll_create) (void(*f)(ThreadId tid, ThreadId child)); +void VG_(track_pre_wqthread_ll_create) (void(*f)(ThreadId tid, Addr workitem)); void VG_(track_pre_thread_first_insn)(void(*f)(ThreadId tid)); void VG_(track_pre_thread_ll_exit) (void(*f)(ThreadId tid)); Index: coregrind/m_tooliface.c =================================================================== --- coregrind/m_tooliface.c (revision 11055) +++ coregrind/m_tooliface.c (working copy) @@ -408,6 +408,7 @@ DEF0(track_stop_client_code, ThreadId, ULong) DEF0(track_pre_thread_ll_create, ThreadId, ThreadId) +DEF0(track_pre_wqthread_ll_create, ThreadId, Addr) DEF0(track_pre_thread_first_insn, ThreadId) DEF0(track_pre_thread_ll_exit, ThreadId) Index: coregrind/pub_core_tooliface.h =================================================================== --- coregrind/pub_core_tooliface.h (revision 11055) +++ coregrind/pub_core_tooliface.h (working copy) @@ -226,6 +226,7 @@ void (*track_stop_client_code) (ThreadId, ULong); void (*track_pre_thread_ll_create)(ThreadId, ThreadId); + void (*track_pre_wqthread_ll_create)(ThreadId, Addr); void (*track_pre_thread_first_insn)(ThreadId); void (*track_pre_thread_ll_exit) (ThreadId); Index: coregrind/m_syswrap/syswrap-x86-darwin.c =================================================================== --- coregrind/m_syswrap/syswrap-x86-darwin.c (revision 11055) +++ coregrind/m_syswrap/syswrap-x86-darwin.c (working copy) @@ -400,7 +400,6 @@ set the mask correctly when we finally get there. */ VG_(sigfillset)(&blockall); VG_(sigprocmask)(VKI_SIG_SETMASK, &blockall, NULL); - if (reuse) { // This thread already exists; we're merely re-entering // after leaving via workq_ops(WQOPS_THREAD_RETURN). @@ -420,6 +419,16 @@ vex = &tst->arch.vex; allocstack(tst->tid); LibVEX_GuestX86_initialise(vex); + /* Tell threading tools the new thread exists. FIXME: we need + to know the identity (tid) of the parent thread, in order + that threading tools can make a dependency edge from it to + this thread. But we don't know what the parent thread is. + Hence pass 1 (the root thread). This is completely wrong in + general, and could cause large numbers of false races to be + reported. In fact, it's positively dangerous; we don't even + know if thread 1 is still alive, and the thread checkers are + likely to assert if it isn't. */ + VG_TRACK(pre_thread_ll_create, 1/*BOGUS*/, tst->tid); } // Set thread's registers @@ -437,6 +446,7 @@ stacksize = 512*1024; // wq stacks are always DEFAULT_STACK_SIZE stack = VG_PGROUNDUP(sp) - stacksize; + VG_TRACK(pre_wqthread_ll_create, tst->tid, workitem); if (reuse) { // Continue V's thread back in the scheduler. // The client thread is of course in another location entirely. @@ -461,7 +471,11 @@ tst->client_stack_highest_word = stack+stacksize; tst->client_stack_szB = stacksize; - // GrP fixme scheduler lock?! + // tell the tool that we are at a point after the new thread + // has its registers set up (so we can take a stack snapshot), + // but before it has executed any instructions (or, really, + // before it has done any memory references). + VG_TRACK(pre_thread_first_insn, tst->tid); // pthread structure ML_(notify_core_and_tool_of_mmap)( 941664 17 bart.vanassche+kde 2010-03-28 19:29:14 +0000 *** Bug 232493 has been marked as a duplicate of this bug. *** 992876 18 jseward 2010-07-22 11:20:22 +0000 (In reply to comment #16) > The patch below adds the track_pre_wqthread_ll_create function to the tooliface > (it also includes your patch). This was enough for me to (probably) add the > support for wqthreads in ThreadSanitizer. Alexander, what is the status of this patch now? Now that you have (I assume) used it for a few months, is it still correct? Or do you have a revised/modified version? > (it also includes your patch) Is this necessary? As per the comments in my patch .. > + /* Tell threading tools the new thread exists. FIXME: we need > + to know the identity (tid) of the parent thread, in order > + that threading tools can make a dependency edge from it to > + this thread. But we don't know what the parent thread is. > + Hence pass 1 (the root thread). This is completely wrong in > + general, and could cause large numbers of false races to be > + reported. In fact, it's positively dangerous; we don't even > + know if thread 1 is still alive, and the thread checkers are > + likely to assert if it isn't. */ > + VG_TRACK(pre_thread_ll_create, 1/*BOGUS*/, tst->tid); > } .. it is completely incorrect, it just (sometimes) stops hg crashing, so I don't want to commit your patch with this kludge in it. 993258 19 glider 2010-07-23 09:16:35 +0000 > Alexander, what is the status of this patch now? Now that you have > (I assume) used it for a few months, is it still correct? Or do you > have a revised/modified version? Yes, we're using this interface function in ThreadSanitizer, and it is still correct. > > Is this necessary? As per the comments in my patch .. > .. it is completely incorrect, it just (sometimes) stops hg crashing, > so I don't want to commit your patch with this kludge in it. Well, as long as we don't mind hg crashing, I can remove this from the patch (I can make up the new one in a couple of days, as I've got restricted internet access now). In fact we don't use this path in ThreadSanitizer anyway. 995396 20 49583 glider 2010-07-28 15:35:18 +0000 Created attachment 49583 A patch that adds the workq_task_start trackable event. To handle workqueue tasks correctly the clients must: -- intercept workq_ops(1 /* QUEUE_ADD */, workitem, _) to handle the task creation -- define VG_(track_workq_task_start) to handle the start of the task execution. The handler receives the worker thread ID and the workitem address -- draw a happens-before arc between these events 1094172 21 bart.vanassche+kde 2011-03-06 18:55:51 +0000 *** Bug 244677 has been marked as a duplicate of this bug. *** 1475184 22 rhyskidd 2014-10-08 09:44:29 +0000 An even smaller reproducing testcase can be found with the following Valgrind test on Mac OX 10.9 (darwin13): $ perl tests/vg_regtest helgrind/tests/pth_cond_destroy_busy drd: ./drd_thread.c:675 (void vgDrd_thread_set_vg_running_tid(const ThreadId)): Assertion 'vg_tid != VG_INVALID_THREADID' failed. ... 1475189 23 rhyskidd 2014-10-08 09:55:21 +0000 Sorry, that should be: $ perl tests/vg_regtest drd/tests/pth_cond_destroy_busy drd: ./drd_thread.c:675 (void vgDrd_thread_set_vg_running_tid(const ThreadId)): Assertion 'vg_tid != VG_INVALID_THREADID' failed. ... 1532305 24 rhyskidd 2015-07-19 07:22:09 +0000 As of r15417 the related helgrind/tests/pth_cond_destroy_busy test is not run on Darwin, so remove as a blocker to BZ#344416. However, this underlying test still fails and exposes a problem which should be fixed. 1610867 25 halilsen 2016-07-27 13:18:50 +0000 Is there any plans to fix this bug? A simple single thread "hello world" application produces the following output on osx 10.11 with valgrind 3.11 valgrind --tool=drd ./bin/Debug/app ==73482== drd, a thread error detector ==73482== Copyright (C) 2006-2015, and GNU GPL'd, by Bart Van Assche. ==73482== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info ==73482== Command: ./bin/Debug/app ==73482== drd: ./drd_thread.c:749 (void vgDrd_thread_set_vg_running_tid(const ThreadId)): Assertion 'vg_tid != VG_INVALID_THREADID' failed. host stacktrace: ==73482== at 0x23802846E: ??? ==73482== by 0x23802888C: ??? ==73482== by 0x23802886A: ??? ==73482== by 0x23800CC52: ??? ==73482== by 0x2380150FF: ??? ==73482== by 0x2380311D5: ??? ==73482== by 0x23802F250: ??? ==73482== by 0x23802F193: ??? sched status: running_tid=0 Thread 1: status = VgTs_Init (lwpid 0) Segmentation fault: 11 1613036 26 rhyskidd 2016-08-10 06:50:56 +0000 It just comes down to having sufficient time. Put another way, I'd always be happy to review patches from others... 2478093 27 pjfloyd 2025-12-19 10:38:39 +0000 Time to check this again. 2478116 28 pjfloyd 2025-12-19 12:49:22 +0000 Still hanging on 10.15. With --tool=none, 2 threads stuck in syscalls (lldb) thread list Process 462 stopped * thread #1: tid = 0x0f89, 0x00000002580c6543 none-amd64-darwin`vgModuleLocal_do_syscall_for_client_unix_WRK + 90, stop reason = signal SIGSTOP thread #2: tid = 0x0fb2, 0x00000002580c6543 none-amd64-darwin`vgModuleLocal_do_syscall_for_client_unix_WRK + 90 With --trace-syscalls=yes SYSCALL[479,1](unix:305) psynch_cvwait(BOGUS) --> [async] ... SYSCALL[479,2](unix:372) __thread_selfid ()[sync] --> Success(0x0:0x12a1) SYSCALL[479,2](unix:304) psynch_cvsignal(BOGUS)[sync] --> Success(0x0:0x101) SYSCALL[479,2](unix:305) psynch_cvwait(BOGUS) --> [async] ... SYSCALL[479,1](unix:305) ... [async] --> Success(0x0:0x0) SYSCALL[479,1](unix:397) sys_write ( 2, 0x104915590, 52 ) --> [async] ... First pthread_cond_destroy() call returned success. SYSCALL[479,1](unix:397) ... [async] --> Success(0x0:0x34) SYSCALL[479,1](unix:515) ulock_wait(operation:UL_UNFAIR_LOCK (flags: 0x1020000), addr:0x70000333f034, value:3075, timeout:0) --> [async] ... So it looks like thread 2 is blocked here SYSCALL[479,2](unix:305) psynch_cvwait(BOGUS) --> [async] ... and thread 1 blocked here SYSCALL[479,1](unix:515) ulock_wait(operation:UL_UNFAIR_LOCK (flags: 0x1020000), addr:0x70000333f034, value:3075, timeout:0) --> [async] ... Need to get gdb working if poss because I can't get lldb to make calls (like call and print with gdb so that I can get the guest callstacks 2478922 29 pjfloyd 2025-12-23 08:17:46 +0000 I've tried updating the patch provided (for x86 and amd64). macOS 10.13 amd64 still hangs in the nsop example. Doesn't look related though (lldb) thr sel 2 * thread #2, stop reason = EXC_BAD_ACCESS (code=1, address=0x0) frame #0: 0x00000002580717b9 memcheck-amd64-darwin`do_syscall_unix_WRK + 41 memcheck-amd64-darwin`do_syscall_unix_WRK: -> 0x2580717b9 <+41>: movq %rdx, (%rcx) 0x2580717bc <+44>: retq memcheck-amd64-darwin`do_syscall_mach_WRK: 0x2580717bd <+0>: movq %rcx, %r10 0x2580717c0 <+3>: movq 0x18(%rsp), %rax (lldb) bt * thread #2, stop reason = EXC_BAD_ACCESS (code=1, address=0x0) * frame #0: 0x00000002580717b9 memcheck-amd64-darwin`do_syscall_unix_WRK + 41 10.13 is a pain to work with. MacPorts gdb is broken and I can't get a guest stack with lldb. 2478924 30 187893 pjfloyd 2025-12-23 08:34:55 +0000 Created attachment 187893 Updated patch Patch for x86 and amd64, put the "pub" bits in #if VGO_darwin blocks 2502776 31 49583 pjfloyd 2026-03-12 12:34:25 +0000 Comment on attachment 49583 A patch that adds the workq_task_start trackable event. Unless I'm missing something I don't see the DRD callback function + registration in this patch. I'll test again the VG_TRACK(pre_thread_first_insn, tst->tid); calls. Without the DRD callbacks I can't do much with the rest od this patch. 38721 2009-11-30 17:56:01 +0000 2009-12-01 17:15:55 +0000 A reproducer of the VEX threading instrumentation problem on Mac OS worker_vex_test.mm text/plain 302810 glider LyogVGhlIGZvbGxvd2luZyBjb2RlIHdhcyB0YWtlbiBmcm9tIGNocm9taXVtLm9yZyBhbmQgc2hv dWxkIGJlIHVzZWQgZm9yCiAqIHRlc3RpbmcgcHVycG9zZXMgb25seS4gVGhlIG1lYW5zIG9mIHVz aW5nIHRoaXMgY29kZSBhcmUgZ292ZXJuZWQgYnkgdGhlCiAqIGxpY2Vuc2UgbG9jYXRlZCBhdCBo dHRwOi8vc3JjLmNocm9taXVtLm9yZy92aWV3dmMvY2hyb21lL3RydW5rL3NyYy9MSUNFTlNFLgog Ki8KI2luY2x1ZGUgPHN0ZGFyZy5oPgojaW5jbHVkZSA8c3lzL3N5c2N0bC5oPgojaW5jbHVkZSA8 QXZhaWxhYmlsaXR5TWFjcm9zLmg+CiNpbmNsdWRlIDxDb3JlRm91bmRhdGlvbi9DRkRhdGUuaD4K I2luY2x1ZGUgPENvcmVGb3VuZGF0aW9uL0NGVGltZVpvbmUuaD4KI2luY2x1ZGUgPG1hY2gvbWFj aF90aW1lLmg+CiNpbmNsdWRlIDxtYWNoL21hY2guaD4KI2luY2x1ZGUgPHN5cy90aW1lLmg+CiNp bmNsdWRlIDx0aW1lLmg+CiNpbmNsdWRlIDxsaW1pdHMuaD4gICAgICAgICAvLyBTbyB3ZSBjYW4g 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2009-11-30 18:04:13 +0000 The log of running Helgrind on the supplied program. worker_vex_test.helgrind.log text/plain 4023 glider PT02Mzc0OD09IEhlbGdyaW5kLCBhIHRocmVhZCBlcnJvciBkZXRlY3Rvcgo9PTYzNzQ4PT0gQ29w eXJpZ2h0IChDKSAyMDA3LTIwMDksIGFuZCBHTlUgR1BMJ2QsIGJ5IE9wZW5Xb3JrcyBMTFAgZXQg YWwuCj09NjM3NDg9PSBVc2luZyBWYWxncmluZC0zLjYuMC5TVk4gYW5kIExpYlZFWDsgcmVydW4g d2l0aCAtaCBmb3IgY29weXJpZ2h0IGluZm8KPT02Mzc0OD09IENvbW1hbmQ6IC9Vc2Vycy9nbGlk ZXIvc3JjL2Nocm9taXVtL2Nocm9taXVtMi9zcmMvYmFzZS9hLm91dAo9PTYzNzQ4PT0gCi0tNjM3 NDgtLSAvVXNlcnMvZ2xpZGVyL3NyYy9jaHJvbWl1bS9jaHJvbWl1bTIvc3JjL2Jhc2UvYS5vdXQ6 Ci0tNjM3NDgtLSBkU1lNIGRpcmVjdG9yeSBpcyBtaXNzaW5nOyBjb25zaWRlciB1c2luZyAtLWRz eW11dGlsPXllcwoyMDA5LTExLTMwIDE5OjQ1OjEzLjg3NSBhLm91dFs2Mzc0ODo1MGJdICoqKiBf TlNBdXRvcmVsZWFzZU5vUG9vbCgpOiBPYmplY3QgMHgxY2RjMTAwIG9mIGNsYXNzIF9fTlNGYXN0 RW51bWVyYXRpb25FbnVtZXJhdG9yIGF1dG9yZWxlYXNlZCB3aXRoIG5vIHBvb2wgaW4gcGxhY2Ug LSBqdXN0IGxlYWtpbmcKU3RhY2s6ICgweDRkMWYwZiAweDNkZTQ0MiAweDQ3NDFkMiAweDQ3NDU5 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