DB failures when page_size larger than 4096

[ambaxter]

thread 'cursor::tests::test_cursor_first_empty_pages' panicked at src/common/page/freelist.rs:326:9:
Page 5 already freed
stack backtrace:
   0: rust_begin_unwind
             at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panicking.rs:665:5
   1: core::panicking::panic_fmt
             at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/panicking.rs:74:14
   2: bbolt_rs::common::page::freelist::Freelist::free
             at ./src/common/page/freelist.rs:326:9
   3: <bbolt_rs::db::DbShared as bbolt_rs::db::DbIApi>::free_page
             at ./src/db.rs:1205:5
   4: <bbolt_rs::common::lock::LockGuard<bbolt_rs::db::DbShared> as bbolt_rs::db::DbIApi>::free_page
             at ./src/db.rs:1063:30
   5: <bbolt_rs::tx::TxCell as bbolt_rs::tx::TxRwIApi>::freelist_free_page
             at ./src/tx.rs:1062:5
   6: bbolt_rs::node::NodeRwCell::free
             at ./src/node.rs:759:5
   7: bbolt_rs::node::NodeRwCell::rebalance
             at ./src/node.rs:628:7
   8: <bbolt_rs::bucket::BucketCell as bbolt_rs::bucket::BucketRwIApi>::rebalance
             at ./src/bucket.rs:1808:7
   9: <bbolt_rs::bucket::BucketCell as bbolt_rs::bucket::BucketRwIApi>::rebalance
             at ./src/bucket.rs:1811:7
  10: <bbolt_rs::tx::TxRwImpl as bbolt_rs::tx::TxRwApi>::commit
             at ./src/tx.rs:1635:5
  11: <bbolt_rs::db::Bolt as bbolt_rs::db::DbRwAPI>::update
             at ./src/db.rs:2068:9
  12: bbolt_rs::cursor::tests::test_cursor_first_empty_pages
             at ./src/cursor.rs:1147:5
  13: bbolt_rs::cursor::tests::test_cursor_first_empty_pages::{{closure}}
             at ./src/cursor.rs:1138:41
  14: core::ops::function::FnOnce::call_once
             at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/ops/function.rs:250:5
  15: core::ops::function::FnOnce::call_once
             at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/ops/function.rs:250:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
page 4: reachable freed
page 5: reachable freed
thread 'cursor::tests::test_cursor_first_empty_pages' panicked at src/test_support.rs:95:9:
explicit panic
stack backtrace:
   0:        0x10515957c - std::backtrace_rs::backtrace::libunwind::trace::hbebc8679d47bdc2c
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5
   1:        0x10515957c - std::backtrace_rs::backtrace::trace_unsynchronized::h3a2e9637943241aa
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:        0x10515957c - std::sys::backtrace::_print_fmt::he430849680584674
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/sys/backtrace.rs:65:5
   3:        0x10515957c - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h243268f17d714c7f
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/sys/backtrace.rs:40:26
   4:        0x1051740dc - core::fmt::rt::Argument::fmt::h0d339881c25f3c31
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/fmt/rt.rs:173:76
   5:        0x1051740dc - core::fmt::write::hb3cfb8a30e72d7ff
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/fmt/mod.rs:1182:21
   6:        0x105156c0c - std::io::Write::write_fmt::hb29a27983b9257a6
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/io/mod.rs:1827:15
   7:        0x10515aaa4 - std::sys::backtrace::BacktraceLock::print::he14461129ccbfef5
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/sys/backtrace.rs:43:9
   8:        0x10515aaa4 - std::panicking::default_hook::{{closure}}::h14c7718ccf39d316
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panicking.rs:269:22
   9:        0x10515a610 - std::panicking::default_hook::hc62e60da3be2f352
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panicking.rs:293:9
  10:        0x1050cc428 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h908689fc227d29b3
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/alloc/src/boxed.rs:2084:9
  11:        0x1050cc428 - test::test_main::{{closure}}::hc84dfdc701b0c9fd
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/test/src/lib.rs:136:21
  12:        0x10515b5a8 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h7134af08cc28e4ff
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/alloc/src/boxed.rs:2084:9
  13:        0x10515b5a8 - std::panicking::rust_panic_with_hook::h09e8a656f11e82b2
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panicking.rs:808:13
  14:        0x10515aeb8 - std::panicking::begin_panic_handler::{{closure}}::h1230eb3cc91b241c
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panicking.rs:674:13
  15:        0x105159a08 - std::sys::backtrace::__rust_end_short_backtrace::hc3491307aceda2c2
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/sys/backtrace.rs:168:18
  16:        0x10515ab80 - rust_begin_unwind
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panicking.rs:665:5
  17:        0x105187fe0 - core::panicking::panic_fmt::ha4b80a05b9fff47a
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/panicking.rs:74:14
  18:        0x10518810c - core::panicking::panic_display::h13e0259b7ed41c2f
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/panicking.rs:264:5
  19:        0x10518810c - core::panicking::panic_explicit::h7107070889cf3407
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/panicking.rs:237:5
  20:        0x10517a534 - bbolt_rs::test_support::TestDb::must_check::panic_cold_explicit::h9743efd48dd7bdea
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/panic.rs:89:13
  21:        0x104f9ed30 - bbolt_rs::test_support::TestDb::must_check::h46a3aa2689cecea0
                               at /Users/abaxter/Projects/bbolt-rs/src/test_support.rs:95:9
  22:        0x104fbb5f8 - <bbolt_rs::test_support::TestDb as core::ops::drop::Drop>::drop::hd3b7b2763de7baa1
                               at /Users/abaxter/Projects/bbolt-rs/src/test_support.rs:141:5
  23:        0x104fb25a8 - core::ptr::drop_in_place<bbolt_rs::test_support::TestDb>::h61311377010d3f6a
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/ptr/mod.rs:542:1
  24:        0x104f9b5d0 - bbolt_rs::cursor::tests::test_cursor_first_empty_pages::h6cdae4db6c785381
                               at /Users/abaxter/Projects/bbolt-rs/src/cursor.rs:1162:3
  25:        0x1050216b8 - bbolt_rs::cursor::tests::test_cursor_first_empty_pages::{{closure}}::h7b2f5eac0cd465e5
                               at /Users/abaxter/Projects/bbolt-rs/src/cursor.rs:1138:41
  26:        0x104fada48 - core::ops::function::FnOnce::call_once::hdb8beece04bbd9e7
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/ops/function.rs:250:5
  27:        0x1050cff3c - core::ops::function::FnOnce::call_once::h0ba6e3d0adcb0fb8
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/ops/function.rs:250:5
  28:        0x1050cff3c - test::__rust_begin_short_backtrace::hc730144174a2f2b8
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/test/src/lib.rs:624:18
  29:        0x1050cf890 - test::run_test_in_process::{{closure}}::h9e544e0587f41be2
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/test/src/lib.rs:647:60
  30:        0x1050cf890 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h8389036b3da9abb4
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/panic/unwind_safe.rs:272:9
  31:        0x1050cf890 - std::panicking::try::do_call::h6c15d214f8b0efc9
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panicking.rs:557:40
  32:        0x1050cf890 - std::panicking::try::h4dec6d151c5d7c52
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panicking.rs:521:19
  33:        0x1050cf890 - std::panic::catch_unwind::h08246350d14b78e5
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panic.rs:350:14
  34:        0x1050cf890 - test::run_test_in_process::h5176f0d7330017af
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/test/src/lib.rs:647:27
  35:        0x1050cf890 - test::run_test::{{closure}}::h3dade545f948edf5
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/test/src/lib.rs:568:43
  36:        0x1050a19bc - test::run_test::{{closure}}::h331e167c3eb94f21
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/test/src/lib.rs:598:41
  37:        0x1050a19bc - std::sys::backtrace::__rust_begin_short_backtrace::h927c17d76a6dfbc6
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/sys/backtrace.rs:152:18
  38:        0x1050a4b20 - std::thread::Builder::spawn_unchecked_::{{closure}}::{{closure}}::h9a08c487421e7042
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/thread/mod.rs:538:17
  39:        0x1050a4b20 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::hf6a2344f0bd24956
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/panic/unwind_safe.rs:272:9
  40:        0x1050a4b20 - std::panicking::try::do_call::hfdb1a93845faf3ef
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panicking.rs:557:40
  41:        0x1050a4b20 - std::panicking::try::h4b35ce5ad8a162fd
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panicking.rs:521:19
  42:        0x1050a4b20 - std::panic::catch_unwind::h3bb4d3ee2986e761
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/panic.rs:350:14
  43:        0x1050a4b20 - std::thread::Builder::spawn_unchecked_::{{closure}}::h5e36dd32c0d26255
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/thread/mod.rs:537:30
  44:        0x1050a4b20 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h4b1e8564c6e52dc1
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/ops/function.rs:250:5
  45:        0x10515ee58 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h01276ebbe54a8110
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/alloc/src/boxed.rs:2070:9
  46:        0x10515ee58 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::habad1faa89d23086
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/alloc/src/boxed.rs:2070:9
  47:        0x10515ee58 - std::sys::pal::unix::thread::Thread::new::thread_start::h1bd1b9c95010bf71
                               at /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/std/src/sys/pal/unix/thread.rs:108:17
  48:        0x1999eb2e4 - __pthread_deallocate
thread 'cursor::tests::test_cursor_first_empty_pages' panicked at library/core/src/panicking.rs:229:5: