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From: Konstantin S. <kon...@gm...> - 2008-01-24 20:49:02
|
On Jan 24, 2008 11:22 PM, Konstantin Serebryany <
kon...@gm...> wrote:
> I see you changed the "Race if ..." condition in MSMProp1 from "LS={}"
> > to "LS={} and #SS > 1", yes?
> >
>
> Yep. That's sort of obvious. There is no race in exclusive state.
>
>
> >
> > I tried to summarise the MSMProp1 state machine, so as to get a
> > clearer idea of what behaviour it allows and does not allow. But
> > really I am guessing. Can you fix/refine this summary? You must
> > have some intuition of what the state machine allows/disallows.
> >
> > J
> >
> >
> > * define a "synchronization event" as any of the following:
> > semaphore post-waits
> > condition variable signal-wait when the waiter blocks
> > thread creation
> > thread joinage
> > a barrier
> >
>
> There are several primary "synchronization events":
> semaphore post-waits
> condition variable signal-wait when the waiter blocks or the while-wait
> loop is annotated
> thread creation/joinage
>
> and various possible secondary (defined via primary) events:
> message queue (aka PCQ), defined through semaphore.
> barrier, defined through condition variable
>
>
>
> > * synchronisation events partition the execution of a threaded program
> > into a set of segments which have a partial ordering, called the
> > the "happens-before" ordering.
> >
> > * a location may be read by a segment S, without a protecting lock,
> > only if all writes to it happened-before S
> >
> > * a location may be written by a segment S, without a protecting
> > lock, only if all reads and all writes to it happened-before S
> >
> > * a location may be read by a segment S, using a protecting lock, only
> > if all writes to it which are concurrent (not-happens-before) use
> > the same protecting lock
> >
> > * a location may be read by a segment S, using a protecting lock,
> > only if all reads and all writes to it which are concurrent
> > (not happens-before) use the same protecting lock
> >
>
>
> I could not express it better! I'll borrow this description for the wiki
> :)
>
>
> It also helps to see what this machine can not do.
> Good examples are test38 and test40 which differ only by calls to sleep().
>
> test38 is not handled by this machine, while test40 works fine.
Ehmm.
The last bullet should probably be 'a location may be *written* by a segment
S'
And actually it is not correct. For test38 this bullet is true, but we still
have a false positive.
Same for reads and test28.
--kcc
|
|
From: Konstantin S. <kon...@gm...> - 2008-01-24 20:22:18
|
>
> I see you changed the "Race if ..." condition in MSMProp1 from "LS={}"
> to "LS={} and #SS > 1", yes?
>
Yep. That's sort of obvious. There is no race in exclusive state.
>
> I tried to summarise the MSMProp1 state machine, so as to get a
> clearer idea of what behaviour it allows and does not allow. But
> really I am guessing. Can you fix/refine this summary? You must
> have some intuition of what the state machine allows/disallows.
>
> J
>
>
> * define a "synchronization event" as any of the following:
> semaphore post-waits
> condition variable signal-wait when the waiter blocks
> thread creation
> thread joinage
> a barrier
>
There are several primary "synchronization events":
semaphore post-waits
condition variable signal-wait when the waiter blocks or the while-wait
loop is annotated
thread creation/joinage
and various possible secondary (defined via primary) events:
message queue (aka PCQ), defined through semaphore.
barrier, defined through condition variable
> * synchronisation events partition the execution of a threaded program
> into a set of segments which have a partial ordering, called the
> the "happens-before" ordering.
>
> * a location may be read by a segment S, without a protecting lock,
> only if all writes to it happened-before S
>
> * a location may be written by a segment S, without a protecting
> lock, only if all reads and all writes to it happened-before S
>
> * a location may be read by a segment S, using a protecting lock, only
> if all writes to it which are concurrent (not-happens-before) use
> the same protecting lock
>
> * a location may be read by a segment S, using a protecting lock,
> only if all reads and all writes to it which are concurrent
> (not happens-before) use the same protecting lock
>
I could not express it better! I'll borrow this description for the wiki :)
It also helps to see what this machine can not do.
Good examples are test38 and test40 which differ only by calls to sleep().
test38 is not handled by this machine, while test40 works fine.
--kcc
|
|
From: Julian S. <js...@ac...> - 2008-01-24 19:52:45
|
On Thursday 24 January 2008 17:07, Konstantin Serebryany wrote:
> I've made first (quick-and-dirty) implementation.
> The machine works as expected, at least on my set of tests.
Sounds good.
I see you changed the "Race if ..." condition in MSMProp1 from "LS={}"
to "LS={} and #SS > 1", yes?
I tried to summarise the MSMProp1 state machine, so as to get a
clearer idea of what behaviour it allows and does not allow. But
really I am guessing. Can you fix/refine this summary? You must
have some intuition of what the state machine allows/disallows.
J
* define a "synchronization event" as any of the following:
semaphore post-waits
condition variable signal-wait when the waiter blocks
thread creation
thread joinage
a barrier
* synchronisation events partition the execution of a threaded program
into a set of segments which have a partial ordering, called the
the "happens-before" ordering.
* a location may be read by a segment S, without a protecting lock,
only if all writes to it happened-before S
* a location may be written by a segment S, without a protecting
lock, only if all reads and all writes to it happened-before S
* a location may be read by a segment S, using a protecting lock, only
if all writes to it which are concurrent (not-happens-before) use
the same protecting lock
* a location may be read by a segment S, using a protecting lock,
only if all reads and all writes to it which are concurrent
(not happens-before) use the same protecting lock
|
|
From: Konstantin S. <kon...@gm...> - 2008-01-24 16:07:22
|
On Jan 23, 2008 12:19 PM, Konstantin Serebryany < kon...@gm...> wrote: > Hi, > > I've described the proposed memory state machine at > http://code.google.com/p/data-race-test/wiki/MSMProp1 . > It has some false positives but imho better than the current one. > I will try to implement it in helgrind and see if it really works. > I've made first (quick-and-dirty) implementation. The machine works as expected, at least on my set of tests. Details on wiki. To be continued... --kcc |
|
From: Tom H. <th...@cy...> - 2008-01-24 04:03:44
|
Nightly build on alvis ( i686, Red Hat 7.3 ) started at 2008-01-24 03:15:08 GMT Results unchanged from 24 hours ago Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... failed Regression test results follow == 339 tests, 84 stderr failures, 1 stdout failure, 29 post failures == memcheck/tests/addressable (stderr) memcheck/tests/badjump (stderr) memcheck/tests/describe-block (stderr) memcheck/tests/erringfds (stderr) memcheck/tests/leak-0 (stderr) memcheck/tests/leak-cycle (stderr) memcheck/tests/leak-pool-0 (stderr) memcheck/tests/leak-pool-1 (stderr) memcheck/tests/leak-pool-2 (stderr) memcheck/tests/leak-pool-3 (stderr) memcheck/tests/leak-pool-4 (stderr) memcheck/tests/leak-pool-5 (stderr) memcheck/tests/leak-regroot (stderr) memcheck/tests/leak-tree (stderr) memcheck/tests/long_namespace_xml (stderr) memcheck/tests/lsframe1 (stderr) memcheck/tests/lsframe2 (stderr) memcheck/tests/malloc_free_fill (stderr) memcheck/tests/match-overrun (stderr) memcheck/tests/noisy_child (stderr) memcheck/tests/partial_load_dflt (stderr) memcheck/tests/partial_load_ok (stderr) memcheck/tests/partiallydefinedeq (stderr) memcheck/tests/pointer-trace (stderr) memcheck/tests/sigkill (stderr) memcheck/tests/stack_changes (stderr) memcheck/tests/supp_unknown (stderr) memcheck/tests/x86/bug152022 (stderr) memcheck/tests/x86/scalar (stderr) memcheck/tests/x86/scalar_supp (stderr) memcheck/tests/x86/xor-undef-x86 (stderr) memcheck/tests/xml1 (stderr) massif/tests/alloc-fns-A (post) massif/tests/alloc-fns-B (post) massif/tests/basic (post) massif/tests/basic2 (post) massif/tests/big-alloc (post) massif/tests/culling1 (stderr) massif/tests/culling2 (stderr) massif/tests/custom_alloc (post) massif/tests/deep-A (post) massif/tests/deep-B (stderr) massif/tests/deep-B (post) massif/tests/deep-C (stderr) massif/tests/deep-C (post) massif/tests/deep-D (post) massif/tests/ignoring (post) massif/tests/insig (post) massif/tests/long-names (post) massif/tests/long-time (post) massif/tests/new-cpp (post) massif/tests/null (post) massif/tests/one (post) massif/tests/overloaded-new (post) massif/tests/peak (post) massif/tests/peak2 (stderr) massif/tests/peak2 (post) massif/tests/realloc (stderr) massif/tests/realloc (post) massif/tests/thresholds_0_0 (post) massif/tests/thresholds_0_10 (post) massif/tests/thresholds_10_0 (post) massif/tests/thresholds_10_10 (post) massif/tests/thresholds_5_0 (post) massif/tests/thresholds_5_10 (post) massif/tests/zero1 (post) massif/tests/zero2 (post) none/tests/blockfault (stderr) none/tests/mremap (stderr) none/tests/mremap2 (stdout) helgrind/tests/hg01_all_ok (stderr) helgrind/tests/hg02_deadlock (stderr) helgrind/tests/hg03_inherit (stderr) helgrind/tests/hg04_race (stderr) helgrind/tests/hg05_race2 (stderr) helgrind/tests/hg06_readshared (stderr) helgrind/tests/tc01_simple_race (stderr) helgrind/tests/tc02_simple_tls (stderr) helgrind/tests/tc03_re_excl (stderr) helgrind/tests/tc04_free_lock (stderr) helgrind/tests/tc05_simple_race (stderr) helgrind/tests/tc06_two_races (stderr) helgrind/tests/tc07_hbl1 (stderr) helgrind/tests/tc08_hbl2 (stderr) helgrind/tests/tc09_bad_unlock (stderr) helgrind/tests/tc10_rec_lock (stderr) helgrind/tests/tc11_XCHG (stderr) helgrind/tests/tc12_rwl_trivial (stderr) helgrind/tests/tc13_laog1 (stderr) helgrind/tests/tc14_laog_dinphils (stderr) helgrind/tests/tc16_byterace (stderr) helgrind/tests/tc17_sembar (stderr) helgrind/tests/tc18_semabuse (stderr) helgrind/tests/tc19_shadowmem (stderr) helgrind/tests/tc20_verifywrap (stderr) helgrind/tests/tc21_pthonce (stderr) helgrind/tests/tc22_exit_w_lock (stderr) helgrind/tests/tc23_bogus_condwait (stderr) helgrind/tests/tc24_nonzero_sem (stderr) exp-drd/tests/fp_race (stderr) exp-drd/tests/fp_race2 (stderr) exp-drd/tests/matinv (stderr) exp-drd/tests/pth_barrier (stderr) exp-drd/tests/pth_broadcast (stderr) exp-drd/tests/pth_cond_race (stderr) exp-drd/tests/pth_cond_race2 (stderr) exp-drd/tests/pth_create_chain (stderr) exp-drd/tests/pth_detached (stderr) exp-drd/tests/pth_detached2 (stderr) exp-drd/tests/sem_as_mutex (stderr) exp-drd/tests/sem_as_mutex2 (stderr) exp-drd/tests/sigalrm (stderr) exp-drd/tests/tc17_sembar (stderr) exp-drd/tests/tc18_semabuse (stderr) |
|
From: Tom H. <th...@cy...> - 2008-01-24 03:46:50
|
Nightly build on aston ( x86_64, Fedora Core 5 ) started at 2008-01-24 03:20:05 GMT Results differ from 24 hours ago Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... failed Regression test results follow == 375 tests, 15 stderr failures, 1 stdout failure, 1 post failure == memcheck/tests/addressable (stderr) memcheck/tests/badjump (stderr) memcheck/tests/describe-block (stderr) memcheck/tests/malloc_free_fill (stderr) memcheck/tests/match-overrun (stderr) memcheck/tests/pointer-trace (stderr) memcheck/tests/supp_unknown (stderr) memcheck/tests/x86/scalar (stderr) memcheck/tests/xml1 (stderr) massif/tests/long-names (post) none/tests/blockfault (stderr) none/tests/mremap (stderr) none/tests/mremap2 (stdout) helgrind/tests/tc20_verifywrap (stderr) helgrind/tests/tc22_exit_w_lock (stderr) exp-drd/tests/pth_cond_race (stderr) exp-drd/tests/sem_as_mutex2 (stderr) ================================================= == Results from 24 hours ago == ================================================= Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... failed Regression test results follow == 375 tests, 14 stderr failures, 1 stdout failure, 1 post failure == memcheck/tests/addressable (stderr) memcheck/tests/badjump (stderr) memcheck/tests/describe-block (stderr) memcheck/tests/malloc_free_fill (stderr) memcheck/tests/match-overrun (stderr) memcheck/tests/pointer-trace (stderr) memcheck/tests/supp_unknown (stderr) memcheck/tests/x86/scalar (stderr) memcheck/tests/xml1 (stderr) massif/tests/long-names (post) none/tests/blockfault (stderr) none/tests/mremap (stderr) none/tests/mremap2 (stdout) helgrind/tests/tc20_verifywrap (stderr) helgrind/tests/tc22_exit_w_lock (stderr) exp-drd/tests/pth_cond_race (stderr) ================================================= == Difference between 24 hours ago and now == ================================================= *** old.short Thu Jan 24 03:33:53 2008 --- new.short Thu Jan 24 03:46:50 2008 *************** *** 8,10 **** ! == 375 tests, 14 stderr failures, 1 stdout failure, 1 post failure == memcheck/tests/addressable (stderr) --- 8,10 ---- ! == 375 tests, 15 stderr failures, 1 stdout failure, 1 post failure == memcheck/tests/addressable (stderr) *************** *** 25,26 **** --- 25,27 ---- exp-drd/tests/pth_cond_race (stderr) + exp-drd/tests/sem_as_mutex2 (stderr) |
|
From: Tom H. <th...@cy...> - 2008-01-24 03:39:09
|
Nightly build on trojan ( x86_64, Fedora Core 6 ) started at 2008-01-24 03:25:05 GMT Results unchanged from 24 hours ago Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... failed Regression test results follow == 373 tests, 7 stderr failures, 5 stdout failures, 1 post failure == memcheck/tests/pointer-trace (stderr) memcheck/tests/vcpu_fnfns (stdout) memcheck/tests/x86/bug133694 (stdout) memcheck/tests/x86/bug133694 (stderr) memcheck/tests/x86/scalar (stderr) massif/tests/long-names (post) none/tests/cmdline1 (stdout) none/tests/cmdline2 (stdout) none/tests/mremap (stderr) none/tests/mremap2 (stdout) helgrind/tests/tc20_verifywrap (stderr) helgrind/tests/tc22_exit_w_lock (stderr) exp-drd/tests/sem_as_mutex2 (stderr) |
|
From: Tom H. <th...@cy...> - 2008-01-24 03:39:03
|
Nightly build on lloyd ( x86_64, Fedora 7 ) started at 2008-01-24 03:05:12 GMT Results unchanged from 24 hours ago Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... failed Regression test results follow == 373 tests, 8 stderr failures, 2 stdout failures, 1 post failure == memcheck/tests/malloc_free_fill (stderr) memcheck/tests/pointer-trace (stderr) memcheck/tests/vcpu_fnfns (stdout) memcheck/tests/x86/scalar (stderr) memcheck/tests/xml1 (stderr) massif/tests/long-names (post) none/tests/mremap (stderr) none/tests/mremap2 (stdout) helgrind/tests/tc20_verifywrap (stderr) helgrind/tests/tc22_exit_w_lock (stderr) exp-drd/tests/pth_cond_race (stderr) |
|
From: Tom H. <th...@cy...> - 2008-01-24 03:29:22
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Nightly build on dellow ( x86_64, Fedora 8 ) started at 2008-01-24 03:10:05 GMT Results differ from 24 hours ago Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... failed Regression test results follow == 373 tests, 9 stderr failures, 2 stdout failures, 1 post failure == memcheck/tests/malloc_free_fill (stderr) memcheck/tests/pointer-trace (stderr) memcheck/tests/vcpu_fnfns (stdout) memcheck/tests/x86/scalar (stderr) memcheck/tests/xml1 (stderr) massif/tests/long-names (post) none/tests/mremap (stderr) none/tests/mremap2 (stdout) helgrind/tests/tc18_semabuse (stderr) helgrind/tests/tc20_verifywrap (stderr) helgrind/tests/tc22_exit_w_lock (stderr) exp-drd/tests/pth_cond_race (stderr) ================================================= == Results from 24 hours ago == ================================================= Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... failed Regression test results follow == 373 tests, 9 stderr failures, 3 stdout failures, 1 post failure == memcheck/tests/malloc_free_fill (stderr) memcheck/tests/pointer-trace (stderr) memcheck/tests/vcpu_fnfns (stdout) memcheck/tests/x86/scalar (stderr) memcheck/tests/xml1 (stderr) massif/tests/long-names (post) none/tests/mremap (stderr) none/tests/mremap2 (stdout) none/tests/pth_detached (stdout) helgrind/tests/tc18_semabuse (stderr) helgrind/tests/tc20_verifywrap (stderr) helgrind/tests/tc22_exit_w_lock (stderr) exp-drd/tests/pth_cond_race (stderr) ================================================= == Difference between 24 hours ago and now == ================================================= *** old.short Thu Jan 24 03:19:58 2008 --- new.short Thu Jan 24 03:29:26 2008 *************** *** 8,10 **** ! == 373 tests, 9 stderr failures, 3 stdout failures, 1 post failure == memcheck/tests/malloc_free_fill (stderr) --- 8,10 ---- ! == 373 tests, 9 stderr failures, 2 stdout failures, 1 post failure == memcheck/tests/malloc_free_fill (stderr) *************** *** 17,19 **** none/tests/mremap2 (stdout) - none/tests/pth_detached (stdout) helgrind/tests/tc18_semabuse (stderr) --- 17,18 ---- |
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From: Tom H. <th...@cy...> - 2008-01-24 03:15:22
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Nightly build on gill ( x86_64, Fedora Core 2 ) started at 2008-01-24 03:00:02 GMT Results unchanged from 24 hours ago Checking out valgrind source tree ... done Configuring valgrind ... done Building valgrind ... done Running regression tests ... failed Regression test results follow == 375 tests, 30 stderr failures, 1 stdout failure, 1 post failure == memcheck/tests/addressable (stderr) memcheck/tests/badjump (stderr) memcheck/tests/describe-block (stderr) memcheck/tests/malloc_free_fill (stderr) memcheck/tests/match-overrun (stderr) memcheck/tests/pointer-trace (stderr) memcheck/tests/stack_switch (stderr) memcheck/tests/supp_unknown (stderr) memcheck/tests/x86/scalar (stderr) memcheck/tests/x86/scalar_supp (stderr) massif/tests/long-names (post) none/tests/blockfault (stderr) none/tests/fdleak_fcntl (stderr) none/tests/mremap (stderr) none/tests/mremap2 (stdout) helgrind/tests/hg01_all_ok (stderr) helgrind/tests/hg02_deadlock (stderr) helgrind/tests/hg03_inherit (stderr) helgrind/tests/hg04_race (stderr) helgrind/tests/hg05_race2 (stderr) helgrind/tests/tc01_simple_race (stderr) helgrind/tests/tc05_simple_race (stderr) helgrind/tests/tc06_two_races (stderr) helgrind/tests/tc09_bad_unlock (stderr) helgrind/tests/tc14_laog_dinphils (stderr) helgrind/tests/tc16_byterace (stderr) helgrind/tests/tc17_sembar (stderr) helgrind/tests/tc19_shadowmem (stderr) helgrind/tests/tc20_verifywrap (stderr) helgrind/tests/tc21_pthonce (stderr) helgrind/tests/tc22_exit_w_lock (stderr) helgrind/tests/tc23_bogus_condwait (stderr) |