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Futex_wait_bitset_private Etimedout (connection Timed Out)


While SPECjvm2008 is only focused on core Java performance, and can't be used to demonstrate multi-vm scaling, the results do show that there is nothing inherent in Java itself that would I have printed shared.page and both.offset values from the futex_key used. It doesn't even repaint the screen. futex resumed> ) = -1 ETIMEDOUT (Connection timed out) 5185 futex(0x805f060, FUTEX_UNLOCK_PI, 1257074676) = 0 FUTEX_WAKE_OP returns the number of threads actually woken up. have a peek here

A fifth argument was added in Linux 2.5.70, and a sixth argument was added in Linux 2.6.7. If another thread changed the value of the futex word after the calling thread decided to block based on the prior value, and if the other thread executed a FUTEX_WAKE operation All other FUTEX_WAKE_OP calls in my strace outputs have returned 1, whereas this particular one has returned 0. From a user-space perspective, what makes a futex PI-aware is a policy agreement (described below) between user space and the kernel about the value of the futex word, coupled with the

Futex_wait_bitset_private Etimedout (connection Timed Out)

futex resumed> ) = -1 ETIMEDOUT (Connection timed out) Last edited by tcn (2013-01-06 17:37:36) Offline #6 2013-01-05 18:18:08 tcn Member Registered: 2011-09-30 Posts: 24 Re: random 100% CPU Acquiring a lock simply consists of using compare-and-swap to atomically set the futex word's value to the caller's TID if its previous value was 0. Is there an equivalent for vim's \zs in sed or perl? PI futexes are operated on by specifying one of the values listed below in futex_op.

  1. Hence it won't wake up 5093.
  2. If so, then it could be that removing the mmap sem was serializing some race on this value.
  3. Later, thread 5109 does FUTEX_WAKE on that very futex (0x80f24d0).
  4. LaTeX resume, in classic style, templated to avoid publishing my private info How do I create armor for a physically weak species?
  5. EINVAL (FUTEX_WAIT_BITSET, FUTEX_WAKE_BITSET) The bit mask supplied in val3 is zero.

The indexer process just seems to grind to a halt. futex resumed> ) = -1 ETIMEDOUT (Connection timed out) 10399 futex(0x805f050, FUTEX_UNLOCK_PI, 4160131060) = 0 10399 futex(0x805f024, FUTEX_WAIT, 2211, {0, 9965948} 10407 futex(0x80f24b8, FUTEX_WAKE, 1) = 0 <=== Wake futex resumed> ) = 0 futex(0x7f63fcf3e728, FUTEX_WAKE_PRIVATE, 1) = 0 futex(0x7f63fcee6ea4, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x7f63fcee6ea0, {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1 futex(0x7f63fd2fab44, FUTEX_WAIT_PRIVATE, 7283, NULL <... Futex Example To obtain the equivalent of FUTEX_WAIT with an absolute timeout, employ FUTEX_WAIT_BITSET with val3 specified as FUTEX_BITSET_MATCH_ANY.

The idea is that these operations should always be paired, in order to ensure that user space and the kernel remain in sync. A process strace show this: futex(0x10a95194, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 21330099, {1341146883, 210791000}, ffffffff) = -1 ETIMEDOUT (Connection timed out) futex(0x10a946d8, FUTEX_WAKE_PRIVATE, 1) = 0 futex(0x10a95194, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 21330101, {1341146883, 210938000}, ffffffff) = -1 ETIMEDOUT The alternative here would be to employ the equivalent atomic machine-language instructions. I'll see if I can reduce the number of processes a bit to see if that makes any difference.

Because it was inherently racy, FUTEX_FD has been removed from Linux 2.6.26 onward. <... Futex Resumed> ) = -1 Etimedout (connection Timed Out) futex resumed> ) = 0 futex(0x7f63fde9e6a8, FUTEX_WAKE_PRIVATE, 1) = 0 futex(0x7f63fcf091e4, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x7f63fcf091e0, {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1 futex(0x7f63fd3a08e4, FUTEX_WAIT_PRIVATE, 7225, NULL <... See FUTEX_WAIT for how to interpret this correctly in practice. When using either -XX:UseSerialGC or the combination of -XX:ParallelGCThreads=1 and -XX:UseParallelOldGC, I no longer hit the 100% cpu usage problem in my initial testing.

Futex_wait_private Etimedout

futex resumed> ) = 0 futex(0x7f63fdc0fbd8, FUTEX_WAKE_PRIVATE, 1) = 0 futex(0x7f63fde63c64, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x7f63fde63c60, {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1 futex(0x7f63fdc10294, FUTEX_WAIT_PRIVATE, 7383, NULL <... FUTEX_WAIT_BITSET Returns 0 if the caller was woken up. Futex_wait_bitset_private Etimedout (connection Timed Out) It seems like the process has finished working, looking at the files it is using. Futex Etimedout Java It doesn't even repaint the screen. > > Expected Results: > At the very least, I should be able to interact with the browser.

Comment 9 Hadmut Danisch 2005-10-03 09:44:33 PDT Would anyone please care about this problem? http://chatflow.net/connection-timed/connection-timed-out-aim-screen-name.html This differs from other futex operations, where timeout is interpreted as an absolute value. Note: for FUTEX_WAIT, timeout is interpreted as a relative value. This is the sum of the woken waiters on the two futexes for the futex words at uaddr and uaddr2. What Is Futex

But it seems that way. futex resumed> ) = -1 ETIMEDOUT (Connection timed out) 5102 futex(0x805f068, FUTEX_UNLOCK_PI, 4159623156) = 0 5102 futex(0x805f03c, FUTEX_WAIT, 271, {0, 9959177}) = -1 ETIMEDOUT (Connection timed out) 5102 futex(0x805f068, FUTEX_UNLOCK_PI, 4159623156) User space can detect this situation via the presence of the FUTEX_OWNER_DIED bit and is then responsible for cleaning up the stale state left over by the dead owner. http://chatflow.net/connection-timed/ruby-errno-etimedout.html If the futex word's value is nonzero, the kernel atomically sets the FUTEX_WAITERS bit, which signals the futex owner that it cannot unlock the futex in user space atomically by setting

To keep FUTEX_WAKE_OP out of the picture, I am running a modified glibc in which pthread_cond_signal skips calling FUTEX_WAKE_OP and defaults to calling FUTEX_WAKE every time. Futex_wake_private Now lets look at my printks from futex_wait and futex_wake in the kernel. Describe the steps: Run release-testing on the above mentioned kernel Is the system (not just the application) hung?

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EINVAL (FUTEX_CMP_REQUEUE_PI) An attempt was made to requeue a waiter to a futex other than that specified by the matching FUTEX_WAIT_REQUEUE_PI call for that waiter. futex resumed> ) = 0 futex(0x7f63fc960888, FUTEX_WAKE_PRIVATE, 1) = 0 futex(0x7f63fdbd83e4, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x7f63fdbd83e0, {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1 futex(0x7f63fcee6ea4, FUTEX_WAIT_PRIVATE, 7297, NULL <... Topics: Active | Unanswered Index ┬╗Kernel & Hardware ┬╗random 100% CPU kernel when running java Pages: 1 #1 2013-01-02 11:00:42 tcn Member Registered: 2011-09-30 Posts: 24 random 100% CPU kernel when Restart_syscall heap size and any tuning) that you are using for your applications?

The caller must close the returned file descriptor after use. Leap Second Bug Collapse X Collapse Posts Latest Activity Search Page of 1 Filter Time All Time Today Last Week Last Month Show All Discussions only Photos only Videos only Links I then installed this kernel without fastgup on our R2 system and saw that the problem is not seen. http://chatflow.net/connection-timed/can-you-see-me-connection-timed-out.html That is, upstream shared futexes take the mmap_sem (and will thus for threaded programs have a big serializing lock) whereas private futexes will not.

ESRCH (FUTEX_LOCK_PI, FUTEX_TRYLOCK_PI, FUTEX_CMP_REQUEUE_PI) The thread ID in the futex word at uaddr does not exist. The browser hangs - usually when closing a > window - and strace on the process reveals a tight loop doing this: > > gettimeofday({1070276566, 674644}, NULL) = 0 > gettimeofday({1070276566, Comment 2 Ian Thurlbeck 2005-03-30 02:26:41 PST I can confirm this problem. FUTEX_CLOCK_REALTIME (since Linux 2.6.28) This option bit can be employed only with the FUTEX_WAIT_BITSET, FUTEX_WAIT_REQUEUE_PI, and (since Linux 4.5) FUTEX_WAIT operations.

I'm not sure about your configuration, but if I set the VM to single CPU then the problems go away but it seems to be very reproducable with 2 or 4 I used strace and some printks in futex_wait/wake to understand what is going on. other bugs to consider - https://bugzilla.mozilla.org/buglist.cgi?type1-0-0=anywordssubstr&field0-0-0=short_desc&bug_severity=blocker&bug_severity=critical&bug_severity=major&bug_severity=normal&type0-0-1=substring&field0-0-1=component&type1-0-1=anywordssubstr&value1-0-1=work%20lost&resolution=---&query_format=advanced&value1-0-0=hang&longdesc=sleep%20wake%20waki%20hibernat&value0-0-1=network&type0-0-0=anywordssubstr&value0-0-0=connect%20network%20sleep%20wake%20waki%20hibernat&field1-0-0=keywords&product=Core&product=NSPR&longdesc_type=anywordssubstr&field1-0-1=short_desc Note You need to log in before you can comment on or make changes to this bug. Only the test hangs. =Comment: #1================================================= Dinakar Guniguntala - 2008-04-23 15:25 EDT gdb debug log of the jxeinajar hang We have 4 threads stuck in a pthread_cond_wait and all on