It does for me. Are you using the latest version of this script from master? I think there were couple of things I changed there recently as part of wide upgrade to Python 3.
On Sun, Mar 22, 2020 at 20:27 Rick Payne <ri...@rossfell.co.uk> wrote: > > Does that command work for you? For me I get: > > (gdb) osv heap > Python Exception <class 'TypeError'> %x format: an integer is required, > not gdb.Value: > Error occurred in Python command: %x format: an integer is required, > not gdb.Value > > Rick > > On Sun, 2020-03-22 at 19:37 -0400, Waldek Kozaczuk wrote: > > Can you run ‘osv heap’ from gdb at this point? > > > > On Sun, Mar 22, 2020 at 19:31 Rick Payne <ri...@rossfell.co.uk> > > wrote: > > > Ok, so i applied the patch, and the printf and this is what I see: > > > > > > page_range_allocator: no ranges found for size 39849984 and exact > > > order: 14 > > > Waiter: 1_scheduler, bytes: 39849984 > > > Out of memory: could not reclaim any further. Current memory: > > > 10933128 > > > Kb, target: 0 Kb > > > > > > Rick > > > > > > On Sat, 2020-03-21 at 21:16 -0700, Waldek Kozaczuk wrote: > > > > > > > > > > > > I think that OSv might be hitting some sort of fragmentation > > > scenario > > > > (another question is why we get to this point) which should be > > > > handled but is not due to the bug this patch fixes: > > > > > > > > diff --git a/core/mempool.cc b/core/mempool.cc > > > > index d902eea8..11fd1456 100644 > > > > --- a/core/mempool.cc > > > > +++ b/core/mempool.cc > > > > @@ -702,10 +702,13 @@ page_range* > > > page_range_allocator::alloc(size_t > > > > size) > > > > for (auto&& pr : _free[exact_order - 1]) { > > > > if (pr.size >= size) { > > > > range = ≺ > > > > + remove_list(exact_order - 1, *range); > > > > break; > > > > } > > > > } > > > > - return nullptr; > > > > + if (!range) { > > > > + return nullptr; > > > > + } > > > > } else if (order == max_order) { > > > > range = &*_free_huge.rbegin(); > > > > if (range->size < size) { > > > > > > > > Can you give it a try and see what happens with this patch? > > > > > > > > Waldek > > > > > > > > PS. You might also add this printout to verify if you are hitting > > > the > > > > hard fragmentation case: > > > > > > > > page_range* range = nullptr; > > > > if (!bitset) { > > > > if (!exact_order || _free[exact_order - 1].empty()) { > > > > + printf("page_range_allocator: no ranges found for > > > size > > > > %ld and exact order: %d\n", size, exact_order); > > > > return nullptr; > > > > } > > > > > > > > On Saturday, March 21, 2020 at 7:17:16 PM UTC-4, rickp wrote: > > > > > Ok, with the waiter_print, we see: > > > > > > > > > > Waiter: 2_scheduler, bytes: 4984832 > > > > > Waiter: 5_scheduler, bytes: 4984832 > > > > > Out of memory: could not reclaim any further. Current memory: > > > > > 10871576Kb, target: 0 Kb > > > > > > > > > > 'osv mem' in gdb reports loads of free memory: > > > > > > > > > > (gdb) osv mem > > > > > Total Memory: 12884372480 Bytes > > > > > Mmap Memory: 1610067968 Bytes (12.50%) > > > > > Free Memory: 11132493824 Bytes (86.40%) > > > > > > > > > > So why is it failing to allocate 5MB when it claims to have > > > 11GB > > > > > free? > > > > > > > > > > Any more debug I can provide? > > > > > > > > > > Rick > > > > > > > > > > On Sat, 2020-03-21 at 15:32 +1000, Rick Payne wrote: > > > > > > And indeed, back on the 'release' image, and we hit an oom: > > > > > > > > > > > > (gdb) b memory::oom > > > > > > Breakpoint 1 at 0x403ee300: file core/mempool.cc, line 505. > > > > > > (gdb) c > > > > > > Continuing. > > > > > > > > > > > > Thread 1 hit Breakpoint 1, memory::oom (target=target@entry=0 > > > ) > > > > > at > > > > > > core/mempool.cc:505 > > > > > > 505 core/mempool.cc: No such file or directory. > > > > > > (gdb) osv memory > > > > > > Total Memory: 12884372480 Bytes > > > > > > Mmap Memory: 1541332992 Bytes (11.96%) > > > > > > Free Memory: 11490983936 Bytes (89.19%) > > > > > > > > > > > > I don't have the _waiters list print unforutnately (as I > > > hadn't > > > > > > included it in this image). It looks like this though: > > > > > > > > > > > > (gdb) p _oom_blocked._waiters > > > > > > $4 = > > > > > > > > > > > > > > {<boost::intrusive::list_impl<boost::intrusive::bhtraits<memory::re > > > > > cl > > > > > > ai > > > > > > mer_waiters::wait_node, > > > > > boost::intrusive::list_node_traits<void*>, > > > > > > (boost::intrusive::link_mode_type)1, > > > boost::intrusive::dft_tag, > > > > > 1>, > > > > > > unsigned long, false, void>> = {static constant_time_size = > > > > > false, > > > > > > static stateful_value_traits = <optimized out>, > > > > > > static has_container_from_iterator = <optimized out>, > > > static > > > > > > safemode_or_autounlink = true, > > > > > > data_ = > > > > > > > > > > > > > > {<boost::intrusive::bhtraits<memory::reclaimer_waiters::wait_node, > > > > > > boost::intrusive::list_node_traits<void*>, > > > > > > (boost::intrusive::link_mode_type)1, > > > boost::intrusive::dft_tag, > > > > > 1>> = > > > > > > > > > > > > > > {<boost::intrusive::bhtraits_base<memory::reclaimer_waiters::wait_n > > > > > od > > > > > > e, > > > > > > boost::intrusive::list_node<void*>*, > > > boost::intrusive::dft_tag, > > > > > 1>> = > > > > > > {<No data fields>}, static link_mode = > > > > > boost::intrusive::safe_link}, > > > > > > root_plus_size_ = > > > > > > {<boost::intrusive::detail::size_holder<false, > > > > > > unsigned long, void>> = { > > > > > > static constant_time_size = <optimized out>}, > > > m_header > > > > > = > > > > > > {<boost::intrusive::list_node<void*>> = { > > > > > > next_ = 0x200041305580, prev_ = 0x200041305580}, > > > <No > > > > > data > > > > > > fields>}}}}, <No data fields>} > > > > > > > > > > > > 'osv waiters' fails, annoyingly: > > > > > > > > > > > > (gdb) osv waiters > > > > > > waiters: > > > > > > Python Exception <class 'gdb.MemoryError'> Cannot access > > > memory > > > > > at > > > > > > address 0x42c00020982ac010: > > > > > > Error occurred in Python command: Cannot access memory at > > > > > address > > > > > > 0x42c00020982ac010 > > > > > > > > > > > > Rick > > > > > > > > > > > > On Sat, 2020-03-21 at 06:42 +1000, Rick Payne wrote: > > > > > > > So we've been trying with a debug image (with the tcp > > > kassert > > > > > > > disabled). We do not get an OOM crash, but after some time > > > > > (24hrs > > > > > > > or > > > > > > > more) all cores just hit idle and never recover. It stops > > > > > > > responding > > > > > > > to > > > > > > > TCP connections and when you attached gdb, you see this: > > > > > > > > > > > > > > Thread 1 received signal SIGINT, Interrupt. > > > > > > > processor::sti_hlt () at arch/x64/processor.hh:252 > > > > > > > 252 arch/x64/processor.hh: No such file or directory. > > > > > > > (gdb) info thread > > > > > > > Id Target Id Frame > > > > > > > * 1 Thread 1 (CPU#0 [halted ]) processor::sti_hlt () at > > > > > > > arch/x64/processor.hh:252 > > > > > > > 2 Thread 2 (CPU#1 [halted ]) processor::sti_hlt () at > > > > > > > arch/x64/processor.hh:252 > > > > > > > 3 Thread 3 (CPU#2 [halted ]) processor::sti_hlt () at > > > > > > > arch/x64/processor.hh:252 > > > > > > > 4 Thread 4 (CPU#3 [halted ]) processor::sti_hlt () at > > > > > > > arch/x64/processor.hh:252 > > > > > > > 5 Thread 5 (CPU#4 [halted ]) processor::sti_hlt () at > > > > > > > arch/x64/processor.hh:252 > > > > > > > 6 Thread 6 (CPU#5 [halted ]) processor::sti_hlt () at > > > > > > > arch/x64/processor.hh:252 > > > > > > > > > > > > > > The threads themselves look liks this: > > > > > > > > > > > > > > (gdb) bt > > > > > > > #0 processor::sti_hlt () at arch/x64/processor.hh:252 > > > > > > > #1 0x00000000405e4016 in arch::wait_for_interrupt () at > > > > > > > arch/x64/arch.hh:43 > > > > > > > #2 0x00000000405d7f10 in sched::cpu::do_idle > > > > > > > (this=0xffff80000001b040) > > > > > > > at core/sched.cc:404 > > > > > > > #3 0x00000000405d7fc1 in sched::cpu::idle > > > > > > > (this=0xffff80000001b040) > > > > > > > at > > > > > > > core/sched.cc:423 > > > > > > > #4 0x00000000405d73ef in > > > > > sched::cpu::<lambda()>::operator()(void) > > > > > > > const (__closure=0xffff800100156070) > > > > > > > at core/sched.cc:165 > > > > > > > #5 0x00000000405e0b57 in std::_Function_handler<void(), > > > > > > > sched::cpu::init_idle_thread()::<lambda()> > > > >::_M_invoke(const > > > > > > > std::_Any_data &) (__functor=...) at > > > > > > > /usr/include/c++/9/bits/std_function.h:300 > > > > > > > #6 0x0000000040496206 in std::function<void > > > ()>::operator()() > > > > > > > const > > > > > > > (this=0xffff800100156070) > > > > > > > at /usr/include/c++/9/bits/std_function.h:690 > > > > > > > #7 0x00000000405db386 in sched::thread::main > > > > > > > (this=0xffff800100156040) > > > > > > > at core/sched.cc:1210 > > > > > > > #8 0x00000000405d7173 in sched::thread_main_c > > > > > > > (t=0xffff800100156040) > > > > > > > at arch/x64/arch-switch.hh:321 > > > > > > > #9 0x00000000404911b3 in thread_main () at > > > > > arch/x64/entry.S:113 > > > > > > > > > > > > > > I tried the 'osv waiters' command but jsut get: > > > > > > > > > > > > > > (gdb) osv waiters > > > > > > > waiters: > > > > > > > Python Exception <class 'gdb.MemoryError'> Cannot access > > > memory > > > > > at > > > > > > > address 0x42c00020880a9010: > > > > > > > Error occurred in Python command: Cannot access memory at > > > > > address > > > > > > > 0x42c00020880a9010 > > > > > > > > > > > > > > I think we'll go back to a 'release' image and see if we > > > get > > > > > the > > > > > > > oom > > > > > > > with a few more clues... > > > > > > > > > > > > > > Rick > > > > > > > > > > > > > > > > > > > > > On Wed, 2020-03-11 at 08:07 -0700, Waldek Kozaczuk wrote: > > > > > > > > On Tuesday, March 10, 2020 at 10:53:17 PM UTC-4, rickp > > > > > wrote: > > > > > > > > > I've not found a way to reproduce this other than in > > > > > production > > > > > > > > > yet, > > > > > > > > > which is annoying. I've built an image with this patch, > > > > > and > > > > > > > > > will > > > > > > > > > see if > > > > > > > > > we can run it with gdb too. > > > > > > > > > > > > > > > > > > What should I be looking for if it hits? > > > > > > > > > > > > > > > > In case of oom() this patch should show a list of > > > threads > > > > > > > > (waiters) > > > > > > > > along with amount of memory requested. I am hoping it > > > will > > > > > give > > > > > > > > better clues where the problem is. > > > > > > > > > Note, the 'osv pagetable walk' command (and a few > > > others) > > > > > seem > > > > > > > > > not > > > > > > > > > to > > > > > > > > > work for me: > > > > > > > > > > > > > > > > > > (gdb) osv pagetable walk > > > > > > > > > Python Exception <class 'gdb.error'> Argument required > > > > > > > > > (expression > > > > > > > > > to > > > > > > > > > compute).: > > > > > > > > > Error occurred in Python: Argument required (expression > > > to > > > > > > > > > compute). > > > > > > > > > > > > > > > > I will look into it. > > > > > > > > > Rick > > > > > > > > > > > > > > > > > > On Tue, 2020-03-10 at 11:21 -0700, Waldek Kozaczuk > > > wrote: > > > > > > > > > > Is there a way to have a reproducible test app? If > > > not I > > > > > was > > > > > > > > > > wondering if this patch enabling some extra logging > > > > > would > > > > > > > > > > help: > > > > > > > > > > > > > > > > > > > > diff --git a/core/mempool.cc b/core/mempool.cc > > > > > > > > > > index d902eea8..ace28b38 100644 > > > > > > > > > > --- a/core/mempool.cc > > > > > > > > > > +++ b/core/mempool.cc > > > > > > > > > > @@ -501,9 +501,9 @@ ssize_t > > > > > > > > > reclaimer::bytes_until_normal(pressure > > > > > > > > > > curr) > > > > > > > > > > } > > > > > > > > > > } > > > > > > > > > > > > > > > > > > > > -void oom() > > > > > > > > > > +void oom(ssize_t target) > > > > > > > > > > { > > > > > > > > > > - abort("Out of memory: could not reclaim any > > > > > further. > > > > > > > > > Current > > > > > > > > > > memory: %d Kb", stats::free() >> 10); > > > > > > > > > > + abort("Out of memory: could not reclaim any > > > > > further. > > > > > > > > > Current > > > > > > > > > > memory: %d Kb, target: %d Kb", stats::free() >> 10, > > > > > target >> > > > > > > > > > 10); > > > > > > > > > > } > > > > > > > > > > > > > > > > > > > > void reclaimer::wait_for_minimum_memory() > > > > > > > > > > @@ -924,6 +924,17 @@ bool > > > > > reclaimer_waiters::wake_waiters() > > > > > > > > > > return woken; > > > > > > > > > > } > > > > > > > > > > > > > > > > > > > > +void reclaimer_waiters::print_waiters() > > > > > > > > > > +{ > > > > > > > > > > + auto it = _waiters.begin(); > > > > > > > > > > + while (it != _waiters.end()) { > > > > > > > > > > + auto& wr = *it; > > > > > > > > > > + it++; > > > > > > > > > > + > > > > > > > > > > + printf( "Waiter: %s, bytes: %ld\n", > > > wr.owner- > > > > > > > > > > >name(), > > > > > > > > > > wr.bytes); > > > > > > > > > > + } > > > > > > > > > > +} > > > > > > > > > > + > > > > > > > > > > // Note for callers: Ideally, we would not only > > > wake, > > > > > but > > > > > > > > > already > > > > > > > > > > allocate > > > > > > > > > > // memory here and pass it back to the waiter. > > > However, > > > > > > > > > > memory > > > > > > > > > is > > > > > > > > > > not always > > > > > > > > > > // allocated the same way (ex: refill_page_buffer > > > is > > > > > > > > > > completely > > > > > > > > > > different from > > > > > > > > > > @@ -943,7 +954,7 @@ void > > > reclaimer_waiters::wait(size_t > > > > > > > > > > bytes) > > > > > > > > > > > > > > > > > > > > // Wait for whom? > > > > > > > > > > if (curr == reclaimer_thread._thread.get()) { > > > > > > > > > > - oom(); > > > > > > > > > > + oom(bytes); > > > > > > > > > > } > > > > > > > > > > > > > > > > > > > > wait_node wr; > > > > > > > > > > @@ -1027,7 +1038,8 @@ void reclaimer::_do_reclaim() > > > > > > > > > > // Wake up all waiters that are > > > waiting > > > > > and > > > > > > > > > > now > > > > > > > > > have > > > > > > > > > > a chance to succeed. > > > > > > > > > > // If we could not wake any, there > > > is > > > > > > > > > > nothing > > > > > > > > > really > > > > > > > > > > we can do. > > > > > > > > > > if (!_oom_blocked.wake_waiters()) { > > > > > > > > > > - oom(); > > > > > > > > > > + _oom_blocked.print_waiters(); > > > > > > > > > > + oom(target); > > > > > > > > > > } > > > > > > > > > > } > > > > > > > > > > > > > > > > > > > > diff --git a/include/osv/mempool.hh > > > > > b/include/osv/mempool.hh > > > > > > > > > > index 10fe5602..620f1a5b 100644 > > > > > > > > > > --- a/include/osv/mempool.hh > > > > > > > > > > +++ b/include/osv/mempool.hh > > > > > > > > > > @@ -137,6 +137,7 @@ public: > > > > > > > > > > bool wake_waiters(); > > > > > > > > > > void wait(size_t bytes); > > > > > > > > > > bool has_waiters() { return !_waiters.empty(); > > > } > > > > > > > > > > + void print_waiters(); > > > > > > > > > > private: > > > > > > > > > > struct wait_node: > > > boost::intrusive::list_base_hook<> > > > > > { > > > > > > > > > > sched::thread* owner; > > > > > > > > > > > > > > > > > > > > Waldek > > > > > > > > > > > > > > > > > > > > On Tuesday, March 10, 2020 at 12:26:54 PM UTC-4, > > > Waldek > > > > > > > > > > Kozaczuk > > > > > > > > > > wrote: > > > > > > > > > > > Well I found this commit changing original "> 0 " > > > to > > > > > ">= 0" > > > > > > > > > > > - > > > > > > > > > > > > > > > > > > > > > > > > > > > > > https://github.com/cloudius-systems/osv/commit/f888c39d744c38cf6fa2f7568c04cea3a7217dca > > > > > > > > > > > > > > > > > > > > > > > > > - with some explanation. So maybe my theory is > > > wrong. > > > > > Also > > > > > > > > > > > I > > > > > > > > > am > > > > > > > > > > > not sure calling bytes_until_normal() before that > > > "if" > > > > > > > > > > > would > > > > > > > > > change > > > > > > > > > > > anything then. > > > > > > > > > > > > > > > > > > > > > > On Tuesday, March 10, 2020 at 12:04:27 PM UTC-4, > > > > > Waldek > > > > > > > > > Kozaczuk > > > > > > > > > > > wrote: > > > > > > > > > > > > So here is full code of of _do_reclaim(): > > > > > > > > > > > > > > > > > > > > > > > > 1001 void reclaimer::_do_reclaim() > > > > > > > > > > > > 1002 { > > > > > > > > > > > > 1003 ssize_t target; > > > > > > > > > > > > 1004 emergency_alloc_level = 1; > > > > > > > > > > > > 1005 > > > > > > > > > > > > 1006 while (true) { > > > > > > > > > > > > 1007 WITH_LOCK(free_page_ranges_lock) { > > > > > > > > > > > > 1008 > > > > > _blocked.wait(free_page_ranges_lock); > > > > > > > > > > > > 1009 target = bytes_until_normal(); > > > > > > > > > > > > 1010 } > > > > > > > > > > > > 1011 > > > > > > > > > > > > 1012 // This means that we are currently > > > > > > > > > > > > ballooning, > > > > > > > > > we > > > > > > > > > > > > should > > > > > > > > > > > > 1013 // try to serve the waiters from > > > > > temporary > > > > > > > > > memory > > > > > > > > > > > > without > > > > > > > > > > > > 1014 // going on hard mode. A big batch > > > of > > > > > more > > > > > > > > > memory is > > > > > > > > > > > > likely > > > > > > > > > > > > 1015 // in its way. > > > > > > > > > > > > 1016 if (_oom_blocked.has_waiters() && > > > > > > > > > > > > throttling_needed()) { > > > > > > > > > > > > 1017 _shrinker_loop(target, [] { > > > return > > > > > > > > > > > > false; > > > > > > > > > }); > > > > > > > > > > > > 1018 WITH_LOCK(free_page_ranges_lock) > > > { > > > > > > > > > > > > 1019 if > > > (_oom_blocked.wake_waiters()) > > > > > { > > > > > > > > > > > > 1020 continue; > > > > > > > > > > > > 1021 } > > > > > > > > > > > > 1022 } > > > > > > > > > > > > 1023 } > > > > > > > > > > > > 1024 > > > > > > > > > > > > 1025 _shrinker_loop(target, [this] { > > > return > > > > > > > > > > > > _oom_blocked.has_waiters(); }); > > > > > > > > > > > > 1026 > > > > > > > > > > > > 1027 WITH_LOCK(free_page_ranges_lock) { > > > > > > > > > > > > 1028 if (target >= 0) { > > > > > > > > > > > > 1029 // Wake up all waiters that > > > are > > > > > > > > > > > > waiting > > > > > > > > > and > > > > > > > > > > > > now have a chance to succeed. > > > > > > > > > > > > 1030 // If we could not wake any, > > > > > there > > > > > > > > > > > > is > > > > > > > > > > > > nothing really we can do. > > > > > > > > > > > > 1031 if > > > > > (!_oom_blocked.wake_waiters()) { > > > > > > > > > > > > 1032 oom(); > > > > > > > > > > > > 1033 } > > > > > > > > > > > > 1034 } > > > > > > > > > > > > 1035 > > > > > > > > > > > > 1036 if (balloon_api) { > > > > > > > > > > > > 1037 balloon_api- > > > > > >voluntary_return(); > > > > > > > > > > > > 1038 } > > > > > > > > > > > > 1039 } > > > > > > > > > > > > 1040 } > > > > > > > > > > > > 1041 } > > > > > > > > > > > > > > > > > > > > > > > > We got oom() because target was '>= 0'. Now the > > > > > target > > > > > > > > > > > > is > > > > > > > > > > > > calculated as the result of > > > bytes_until_normal(). > > > > > > > > > > > > > > > > > > > > > > > > 495 ssize_t > > > reclaimer::bytes_until_normal(pressure > > > > > > > > > > > > curr) > > > > > > > > > > > > 496 { > > > > > > > > > > > > 497 > > > > > assert(mutex_owned(&free_page_ranges_lock)); > > > > > > > > > > > > 498 if (curr == pressure::PRESSURE) { > > > > > > > > > > > > 499 return watermark_lo - > > > stats::free(); > > > > > > > > > > > > 500 } else { > > > > > > > > > > > > 501 return 0; > > > > > > > > > > > > 502 } > > > > > > > > > > > > 503 } > > > > > > > > > > > > > > > > > > > > > > > > which seems to indicate that when 0 is returned > > > there > > > > > no > > > > > > > > > > > > need > > > > > > > > > to > > > > > > > > > > > > reclaim any memory. > > > > > > > > > > > > > > > > > > > > > > > > So here are two things that might be wrong: > > > > > > > > > > > > > > > > > > > > > > > > 1. Shouldn't if (target >= 0) be changed to if > > > > > (target > > > > > > > > > > > > > 0) > > > > > > > > > {? > > > > > > > > > > > > 2. Shouldn't we re-read the target in second > > > > > WITH_LOCK > > > > > > > > > instead of > > > > > > > > > > > > comparing the original value in the beginning of > > > the > > > > > body > > > > > > > > > > > > of > > > > > > > > > the > > > > > > > > > > > > loop? The line before - _shrinker_loop(target, > > > [this] > > > > > { > > > > > > > > > return > > > > > > > > > > > > _oom_blocked.has_waiters(); }); - might have > > > just > > > > > > > > > > > > released > > > > > > > > > enough > > > > > > > > > > > > memory to bring target below 0, right? > > > > > > > > > > > > > > > > > > > > > > > > In any case it would be useful to print the value > > > of > > > > > the > > > > > > > > > target > > > > > > > > > > > > before oom(): > > > > > > > > > > > > > > > > > > > > > > > > if > > > (!_oom_blocked.wake_waiters()) { > > > > > > > > > > > > > > > > > > > > > > > > printf("--> Target: %ld\n", > > > > > > > > > > > > target); > > > > > > > > > > > > > > > > > > > > > > > > oom(); > > > > > > > > > > > > > > > > > > > > > > > > } > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > On Monday, March 9, 2020 at 10:51:02 PM UTC-4, > > > rickp > > > > > > > > > > > > wrote: > > > > > > > > > > > > > We're pretty close to current on OSv, but it > > > also > > > > > > > > > > > > > happens > > > > > > > > > on an > > > > > > > > > > > > > older > > > > > > > > > > > > > image. We have changed some stuff in our app, > > > but > > > > > I > > > > > > > > > > > > > think > > > > > > > > > that > > > > > > > > > > > > > may just > > > > > > > > > > > > > be provking the bug. Certainly from gdb, I can > > > see > > > > > that > > > > > > > > > both > > > > > > > > > > > > > mmaped and > > > > > > > > > > > > > normal memory fluctuate up and down but > > > eveything > > > > > looks > > > > > > > > > sane. > > > > > > > > > > > > > More debug in wake_waiters would be useful, but > > > > > I'm > > > > > > > > > > > > > losing > > > > > > > > > the > > > > > > > > > > > > > argument > > > > > > > > > > > > > to continue with OSv at the moment which makes > > > > > testing > > > > > > > > > > > > > this > > > > > > > > > a > > > > > > > > > > > > > bit > > > > > > > > > > > > > 'political'. > > > > > > > > > > > > > > > > > > > > > > > > > > btw - when we do run the system out of memory, > > > it > > > > > seems > > > > > > > > > > > > > to > > > > > > > > > hang > > > > > > > > > > > > > rather > > > > > > > > > > > > > than generate an oom. Have you tried it? > > > > > > > > > > > > > > > > > > > > > > > > > > The tcp_do_segment one has been mentioned > > > before > > > > > (by > > > > > > > > > someone > > > > > > > > > > > > > else). The > > > > > > > > > > > > > issue is that the kassert only has effect in > > > the > > > > > debug > > > > > > > > > build. > > > > > > > > > > > > > I'd guess > > > > > > > > > > > > > that the socket is being closed, but still has > > > > > segments > > > > > > > > > that > > > > > > > > > > > > > have not > > > > > > > > > > > > > been processed, or something like that. I'll > > > try > > > > > and > > > > > > > > > > > > > narrow > > > > > > > > > it > > > > > > > > > > > > > down a > > > > > > > > > > > > > bit if I get time. > > > > > > > > > > > > > > > > > > > > > > > > > > Rick > > > > > > > > > > > > > > > > > > > > > > > > > > On Mon, 2020-03-09 at 22:32 -0400, Waldek > > > Kozaczuk > > > > > > > > > > > > > wrote: > > > > > > > > > > > > > > Does it happen with the very latest OSv code? > > > Did > > > > > it > > > > > > > > > start > > > > > > > > > > > > > happening > > > > > > > > > > > > > > at some point more often? > > > > > > > > > > > > > > > > > > > > > > > > > > > > I wonder if we could add some helpful > > > printouts > > > > > in > > > > > > > > > > > > > wake_waiters(). > > > > > > > > > > > > > > Btw that assert() failure in tcp_do_segment() > > > > > rings a > > > > > > > > > bell. > > > > > > > > > > > > > > On Mon, Mar 9, 2020 at 22:25 Rick Payne < > > > > > > > > > ri...@rossfell.co.uk > > > > > > > > > > > > > > wrote: > > > > > > > > > > > > > > > I can't add much other than I doubt its > > > > > > > > > > > > > > > fragmentation. > > > > > > > > > > > > > Sometimes > > > > > > > > > > > > > > > this > > > > > > > > > > > > > > > happens within a few minutes of the system > > > > > > > > > > > > > > > starting. > > > > > > > > > > > > > > > At > > > > > > > > > no > > > > > > > > > > > > > point do > > > > > > > > > > > > > > > I > > > > > > > > > > > > > > > think we're using more than 2GB of ram (of > > > the > > > > > > > > > > > > > > > 12GB) > > > > > > > > > > > > > either. > > > > > > > > > > > > > > > I did compile up a debug verison of OSv and > > > > > built > > > > > > > > > > > > > > > the > > > > > > > > > > > > > system with > > > > > > > > > > > > > > > that, > > > > > > > > > > > > > > > but I've been unable to trigger the oom(). > > > > > Worse, I > > > > > > > > > > > > > > > hit > > > > > > > > > a > > > > > > > > > > > > > kassert > > > > > > > > > > > > > > > in > > > > > > > > > > > > > > > the netchannel code that seems to be > > > ignored > > > > > in > > > > > > > > > > > > > > > the > > > > > > > > > > > > > 'release' > > > > > > > > > > > > > > > build, > > > > > > > > > > > > > > > but panics in the debug build: > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > [E/384 bsd-kassert]: tcp_do_segment: > > > > > TCPS_LISTEN > > > > > > > > > > > > > > > Assertion failed: tp->get_state() > 1 > > > > > > > > > > > > > > > (bsd/sys/netinet/tcp_input.cc: > > > > > > > > > > > > > > > tcp_do_segment: 1076) > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > [backtrace] > > > > > > > > > > > > > > > 0x0000000040221330 <abort(char const*, > > > > > ...)+280> > > > > > > > > > > > > > > > 0x0000000040221399 <__assert_fail+64> > > > > > > > > > > > > > > > 0x00000000402a4798 <???+1076512664> > > > > > > > > > > > > > > > 0x00000000402a97c2 <???+1076533186> > > > > > > > > > > > > > > > 0x00000000402a98a1 <???+1076533409> > > > > > > > > > > > > > > > 0x00000000402aa448 <???+1076536392> > > > > > > > > > > > > > > > 0x0000000040656a9a <std::function<void > > > > > > > > > > > > > (mbuf*)>::operator()(mbuf*) > > > > > > > > > > > > > > > const+76> > > > > > > > > > > > > > > > 0x0000000040655855 > > > > > > > > > > > > > > > <net_channel::process_queue()+61> > > > > > > > > > > > > > > > 0x000000004023b165 <???+1076080997> > > > > > > > > > > > > > > > 0x000000004023b4d7 <soclose+878> > > > > > > > > > > > > > > > 0x000000004024cd21 > > > <socket_file::close()+51> > > > > > > > > > > > > > > > 0x00000000406a6a10 <fdrop+151> > > > > > > > > > > > > > > > 0x00000000406a64f7 <fdclose(int)+184> > > > > > > > > > > > > > > > 0x000000004067cd42 <close+41> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > So at the moment, I'm a bit stuck with > > > getting > > > > > any > > > > > > > > > more > > > > > > > > > > > > > info... > > > > > > > > > > > > > > > Rick > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > On Mon, 2020-03-09 at 08:52 -0700, Waldek > > > > > Kozaczuk > > > > > > > > > wrote: > > > > > > > > > > > > > > > > As I understand this stack trace the > > > oom() > > > > > was > > > > > > > > > called > > > > > > > > > > > > > here as > > > > > > > > > > > > > > > part of > > > > > > > > > > > > > > > > _do_reclaim(): > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > 1025 > > > WITH_LOCK(free_page_ranges_lock) > > > > > { > > > > > > > > > > > > > > > > 1026 if (target >= 0) { > > > > > > > > > > > > > > > > 1027 // Wake up all > > > waiters > > > > > that > > > > > > > > > > > > > > > > are > > > > > > > > > > > > > waiting and > > > > > > > > > > > > > > > now > > > > > > > > > > > > > > > > have a chance to succeed. > > > > > > > > > > > > > > > > 1028 // If we could not > > > wake > > > > > any, > > > > > > > > > there > > > > > > > > > > > > > is > > > > > > > > > > > > > > > nothing > > > > > > > > > > > > > > > > really we can do. > > > > > > > > > > > > > > > > 1029 if > > > > > > > > > (!_oom_blocked.wake_waiters()) { > > > > > > > > > > > > > > > > 1030 oom(); > > > > > > > > > > > > > > > > 1031 } > > > > > > > > > > > > > > > > 1032 } > > > > > > > > > > > > > > > > 1033 > > > > > > > > > > > > > > > > 1034 if (balloon_api) { > > > > > > > > > > > > > > > > 1035 balloon_api- > > > > > > > > > > voluntary_return(); > > > > > > > > > > > > > > > > 1036 } > > > > > > > > > > > > > > > > 1037 } > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > so it seems wake_waiters() returned > > > false. I > > > > > > > > > > > > > > > > wonder > > > > > > > > > if > > > > > > > > > > > > > the memory > > > > > > > > > > > > > > > was > > > > > > > > > > > > > > > > heavily fragmented or there is some > > > logical > > > > > bug > > > > > > > > > > > > > > > > in > > > > > > > > > there. > > > > > > > > > > > > > This > > > > > > > > > > > > > > > method > > > > > > > > > > > > > > > > is called from two places and I wonder if > > > > > this > > > > > > > > > > > > > > > > part > > > > > > > > > of > > > > > > > > > > > > > > > wake_waiters() > > > > > > > > > > > > > > > > is correct: > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > 921 if (!_waiters.empty()) { > > > > > > > > > > > > > > > > 922 reclaimer_thread.wake(); > > > > > > > > > > > > > > > > 923 } > > > > > > > > > > > > > > > > 924 return woken; > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > should this if also set woken to true? > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Also could we also enhance the oom() > > > logic > > > > > to > > > > > > > > > > > > > > > > print > > > > > > > > > out > > > > > > > > > > > > > more > > > > > > > > > > > > > > > useful > > > > > > > > > > > > > > > > information if this happens once again? > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > On Tuesday, March 3, 2020 at 2:21:40 AM > > > UTC- > > > > > 5, > > > > > > > > > > > > > > > > rickp > > > > > > > > > > > > > wrote: > > > > > > > > > > > > > > > > > Had a crash on a system that I don't > > > > > > > > > > > > > > > > > understand. > > > > > > > > > Its a > > > > > > > > > > > > > VM with > > > > > > > > > > > > > > > > > 12GB > > > > > > > > > > > > > > > > > allocated, we were running without > > > about > > > > > 10.5GB > > > > > > > > > free > > > > > > > > > > > > > according > > > > > > > > > > > > > > > to > > > > > > > > > > > > > > > > > the > > > > > > > > > > > > > > > > > API. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Out of the blue, we had a panic: > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Out of memory: could not reclaim any > > > > > further. > > > > > > > > > Current > > > > > > > > > > > > > memory: > > > > > > > > > > > > > > > > > 10954988 > > > > > > > > > > > > > > > > > Kb > > > > > > > > > > > > > > > > > [backtrace] > > > > > > > > > > > > > > > > > 0x00000000403f6320 <memory::oom()+32> > > > > > > > > > > > > > > > > > 0x00000000403f71cc > > > > > > > > > > > > > <memory::reclaimer::_do_reclaim()+380> > > > > > > > > > > > > > > > > > 0x00000000403f722f <???+1077899823> > > > > > > > > > > > > > > > > > 0x000000004040f29b <thread_main_c+43> > > > > > > > > > > > > > > > > > 0x00000000403ae412 <???+1077601298> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > The 'Out of memory' message seems to > > > print > > > > > > > > > > > > > stats::free() and > > > > > > > > > > > > > > > that > > > > > > > > > > > > > > > > > number suggests we have plenty of free > > > > > ram. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Have I misunderstood, or is there > > > something > > > > > I > > > > > > > > > > > > > > > > > need > > > > > > > > > to > > > > > > > > > > > > > be > > > > > > > > > > > > > > > looking > > > > > > > > > > > > > > > > > at? > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Cheers, > > > > > > > > > > > > > > > > > Rick > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > > > > > > > > > > > > > You received this message because you > > > are > > > > > > > > > > > > > > > > subscribed > > > > > > > > > to > > > > > > > > > > > > > the > > > > > > > > > > > > > > > Google > > > > > > > > > > > > > > > > Groups "OSv Development" group. > > > > > > > > > > > > > > > > To unsubscribe from this group and stop > > > > > receiving > > > > > > > > > emails > > > > > > > > > > > > > from it, > > > > > > > > > > > > > > > > send an email to osv...@googlegroups.com. > > > > > > > > > > > > > > > > > > > To view this discussion on the web visit > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > https://groups.google.com/d/msgid/osv-dev/8f7e00a5-edfe-4487-aa5a-5072a560c6e3%40googlegroups.com > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > . > > > > > > > > > > > > > > > > > > > > -- > > > > > > > > > > You received this message because you are subscribed > > > to > > > > > the > > > > > > > > > Google > > > > > > > > > > Groups "OSv Development" group. > > > > > > > > > > To unsubscribe from this group and stop receiving > > > emails > > > > > from > > > > > > > > > it, > > > > > > > > > > send an email to osv...@googlegroups.com. > > > > > > > > > > To view this discussion on the web visit > > > > > > > > > > > > > > > > > > > > > > > > > > > > https://groups.google.com/d/msgid/osv-dev/b8a57083-2882-4878-8668-f510eaceff84%40googlegroups.com > > > > > > > > > > > > > > > > > > > > > > > > . > > > > > > > > > > > > > > > > -- > > > > > > > > You received this message because you are subscribed to > > > the > > > > > > > > Google > > > > > > > > Groups "OSv Development" group. > > > > > > > > To unsubscribe from this group and stop receiving emails > > > from > > > > > it, > > > > > > > > send an email to osv...@googlegroups.com. > > > > > > > > To view this discussion on the web visit > > > > > > > > > > > > > > > > > https://groups.google.com/d/msgid/osv-dev/79e94c93-f832-4ed9-935e-0ffd9a1a4ec6%40googlegroups.com > > > > > > > > > > > > > . > > > > > > > > > > > > > -- > > > > You received this message because you are subscribed to the > > > Google > > > > Groups "OSv Development" group. > > > > To unsubscribe from this group and stop receiving emails from it, > > > > send an email to osv-dev+unsubscr...@googlegroups.com. > > > > To view this discussion on the web visit > > > > > > > > https://groups.google.com/d/msgid/osv-dev/443b4410-5c69-436c-b9ba-85b4a42ad61f%40googlegroups.com > > > > . > > > > > -- > You received this message because you are subscribed to the Google Groups > "OSv Development" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to osv-dev+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/osv-dev/188c71d297eb49013250377e82df96a298b39df6.camel%40rossfell.co.uk > . > -- You received this message because you are subscribed to the Google Groups "OSv Development" group. 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