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srh avatar srh commented on July 20, 2024

Reformatted backtrace, replacing \n's:

1 [0xcf0200]: backtrace_t::backtrace_t() at ??:?
2 [0xcf0560]: format_backtrace(bool) at ??:?
3 [0x9d090f]: report_fatal_error(char const*, int, char const*, ...) at ??:?
4 [0x9fa084]: leaf::prepare_space_for_new_entry(value_sizer_t*, leaf_node_t*, btree_key_t const*, int, repli_timestamp_t, repli_timestamp_t, bool, char**) at ??:?
5 [0x9fa11f]: leaf::insert(value_sizer_t*, leaf_node_t*, btree_key_t const*, void const*, repli_timestamp_t, repli_timestamp_t) at ??:?
6 [0x9efe0b]: apply_keyvalue_change(value_sizer_t*, keyvalue_location_t*, btree_key_t const*, repli_timestamp_t, value_deleter_t const*, delete_mode_t) at ??:?
7 [0xd0ad05]: kv_location_set(keyvalue_location_t*, store_key_t const&, ql::datum_t, repli_timestamp_t, deletion_context_t const*, rdb_modification_info_t*) at ??:?
8 [0xd0b117]: rdb_replace_and_return_superblock(btree_loc_info_t const&, btree_point_replacer_t const*, deletion_context_t const*, promise_t<superblock_t*>*, rdb_modification_info_t*, profile::trace_t*) at ??:?
9 [0xd1243e]: do_a_replace_from_batched_replace(auto_drainer_t::lock_t, fifo_enforcer_sink_t*, fifo_enforcer_write_token_t const&, btree_loc_info_t const&, one_replace_t, ql::configured_limits_t const&, promise_t<superblock_t*>*, rdb_modification_report_cb_t*, bool, ql::datum_t*, profile::trace_t*, std::set<std::string, std::less<std::string>, std::allocator<std::string> >*) at ??:?
10 [0xd134f7]: std::_Function_handler<void (), std::_Bind<void (*(auto_drainer_t::lock_t, fifo_enforcer_sink_t*, fifo_enforcer_write_token_t, btree_loc_info_t, one_replace_t, ql::configured_limits_t, promise_t<superblock_t*>*, rdb_modification_report_cb_t*, bool, ql::datum_t*, profile::trace_t*, std::set<std::string, std::less<std::string>, std::allocator<std::string> >*))(auto_drainer_t::lock_t, fifo_enforcer_sink_t*, fifo_enforcer_write_token_t const&, btree_loc_info_t const&, one_replace_t, ql::configured_limits_t const&, promise_t<superblock_t*>*, rdb_modification_report_cb_t*, bool, ql::datum_t*, profile::trace_t*, std::set<std::string, std::less<std::string>, std::allocator<std::string> >*)> >::_M_invoke(std::_Any_data const&) at ??:?
11 [0xbc0ba2]: coro_pool_t<std::function<void ()> >::worker_run(std::function<void ()>, auto_drainer_t::lock_t) at ??:?
12 [0xbc0f26]: callable_action_instance_t<std::_Bind<std::_Mem_fn<void (coro_pool_t<std::function<void ()> >::*)(std::function<void ()>, auto_drainer_t::lock_t)> (coro_pool_t<std::function<void ()> >*, std::function<void ()>, auto_drainer_t::lock_t)> >::run_action() at ??:?
13 [0xf15e64]: coro_t::run() at ??:?

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srh avatar srh commented on July 20, 2024

@dpineiden Either there is a bug in RethinkDB that caused an incorrectly updated block, or there is was memory corruption or disk corruption. This error hasn't been reported before, but it is plausible that it's a RethinkDB bug.

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dpineiden avatar dpineiden commented on July 20, 2024

Thanks!
Well, so I report this, here :S

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srh avatar srh commented on July 20, 2024

Yeah, I don't have much info for you beyond that. Since 65500 is in binary, 1111111111011100, and it's a 16-bit value (either the frontmost field on the leaf node or the field's value after some addition of small values to it), it is plausible that some rarely executed corner of leaf node splitting or merging logic causes the frontmost field to be miscomputed and underflow. Maybe the math computing whether two leaf nodes are mergeable is not correct.

If it were a bit-flip, it'd have to be more like a whole byte-flip, the upper 8 bits all turning over. Or that value was calculated downstream of some other bit-flipped value, but I don't see how.

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dpineiden avatar dpineiden commented on July 20, 2024

Wow, this is so advanced. The rethinkdb in this server is compiled because is a centos 7 and old computer, maybe is usefull for you that i upload the compiled version... so tell me

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