core: use 64 bit head+tail pointers in fair_queue #11
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When uint32_t offsets were used here, the frequent integer wrapping caused queues to get stuck. The _pending tail values would compare as greater than the head values forever if there weren't always new requests coming through to wrap the head/tail pointers again. Signed-off-by: John Spray <jcs@vectorized.io>
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…o_with Fixes failures in debug mode: ``` $ build/debug/tests/unit/closeable_test -l all -t deferred_close_test WARNING: debug mode. Not for benchmarking or production random-seed=3064133628 Running 1 test case... Entering test module "../../tests/unit/closeable_test.cc" ../../tests/unit/closeable_test.cc(0): Entering test case "deferred_close_test" ../../src/testing/seastar_test.cc(43): info: check true has passed ==9449==WARNING: ASan doesn't fully support makecontext/swapcontext functions and may produce false positives in some cases! terminate called after throwing an instance of 'seastar::broken_promise' what(): broken promise ==9449==WARNING: ASan is ignoring requested __asan_handle_no_return: stack top: 0x7fbf1f49f000; bottom 0x7fbf40971000; size: 0xffffffffdeb2e000 (-558702592) False positive error reports may follow For details see google/sanitizers#189 ================================================================= ==9449==AddressSanitizer CHECK failed: ../../../../libsanitizer/asan/asan_thread.cpp:356 "((ptr[0] == kCurrentStackFrameMagic)) != (0)" (0x0, 0x0) #0 0x7fbf45f39d0b (/lib64/libasan.so.6+0xb3d0b) redpanda-data#1 0x7fbf45f57d4e (/lib64/libasan.so.6+0xd1d4e) redpanda-data#2 0x7fbf45f3e724 (/lib64/libasan.so.6+0xb8724) redpanda-data#3 0x7fbf45eb3e5b (/lib64/libasan.so.6+0x2de5b) redpanda-data#4 0x7fbf45eb51e8 (/lib64/libasan.so.6+0x2f1e8) redpanda-data#5 0x7fbf45eb7694 (/lib64/libasan.so.6+0x31694) redpanda-data#6 0x7fbf45f39398 (/lib64/libasan.so.6+0xb3398) redpanda-data#7 0x7fbf45f3a00b in __asan_report_load8 (/lib64/libasan.so.6+0xb400b) redpanda-data#8 0xfe6d52 in bool __gnu_cxx::operator!=<dl_phdr_info*, std::vector<dl_phdr_info, std::allocator<dl_phdr_info> > >(__gnu_cxx::__normal_iterator<dl_phdr_info*, std::vector<dl_phdr_info, std::allocator<dl_phdr_info> > > const&, __gnu_cxx::__normal_iterator<dl_phdr_info*, std::vector<dl_phdr_info, std::allocator<dl_phdr_info> > > const&) /usr/include/c++/10/bits/stl_iterator.h:1116 redpanda-data#9 0xfe615c in dl_iterate_phdr ../../src/core/exception_hacks.cc:121 redpanda-data#10 0x7fbf44bd1810 in _Unwind_Find_FDE (/lib64/libgcc_s.so.1+0x13810) redpanda-data#11 0x7fbf44bcd897 (/lib64/libgcc_s.so.1+0xf897) redpanda-data#12 0x7fbf44bcea5f (/lib64/libgcc_s.so.1+0x10a5f) redpanda-data#13 0x7fbf44bcefd8 in _Unwind_RaiseException (/lib64/libgcc_s.so.1+0x10fd8) redpanda-data#14 0xfe6281 in _Unwind_RaiseException ../../src/core/exception_hacks.cc:148 redpanda-data#15 0x7fbf457364bb in __cxa_throw (/lib64/libstdc++.so.6+0xaa4bb) redpanda-data#16 0x7fbf45e10a21 (/lib64/libboost_unit_test_framework.so.1.73.0+0x1aa21) redpanda-data#17 0x7fbf45e20fe0 in boost::execution_monitor::execute(boost::function<int ()> const&) (/lib64/libboost_unit_test_framework.so.1.73.0+0x2afe0) redpanda-data#18 0x7fbf45e21094 in boost::execution_monitor::vexecute(boost::function<void ()> const&) (/lib64/libboost_unit_test_framework.so.1.73.0+0x2b094) redpanda-data#19 0x7fbf45e43921 in boost::unit_test::unit_test_monitor_t::execute_and_translate(boost::function<void ()> const&, unsigned long) (/lib64/libboost_unit_test_framework.so.1.73.0+0x4d921) redpanda-data#20 0x7fbf45e5eae1 (/lib64/libboost_unit_test_framework.so.1.73.0+0x68ae1) redpanda-data#21 0x7fbf45e5ed31 (/lib64/libboost_unit_test_framework.so.1.73.0+0x68d31) redpanda-data#22 0x7fbf45e2e547 in boost::unit_test::framework::run(unsigned long, bool) (/lib64/libboost_unit_test_framework.so.1.73.0+0x38547) redpanda-data#23 0x7fbf45e43618 in boost::unit_test::unit_test_main(bool (*)(), int, char**) (/lib64/libboost_unit_test_framework.so.1.73.0+0x4d618) redpanda-data#24 0x44798d in seastar::testing::entry_point(int, char**) ../../src/testing/entry_point.cc:77 redpanda-data#25 0x4134b5 in main ../../include/seastar/testing/seastar_test.hh:65 redpanda-data#26 0x7fbf44a1b1e1 in __libc_start_main (/lib64/libc.so.6+0x281e1) redpanda-data#27 0x4133dd in _start (/home/bhalevy/dev/seastar/build/debug/tests/unit/closeable_test+0x4133dd) ``` Signed-off-by: Benny Halevy <bhalevy@scylladb.com> Message-Id: <20210406100911.12278-1-bhalevy@scylladb.com>
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When uint32_t offsets were used here, the frequent
integer wrapping caused queues to get stuck. The _pending
tail values would compare as greater than the head values
forever if there weren't always new requests coming through
to wrap the head/tail pointers again.
Signed-off-by: John Spray jcs@vectorized.io