Sometimes it can be re-produced, sometimes not. Tried to sync a fresh node and got a coredump:
(gdb) bt
#0 0x000056550868137e in mdb_env_pick_meta (env=0x565522122d30) at mdb/libraries/liblmdb/mdb.c:3850
#1 mdb_env_info (env=0x565522122d30, arg=0x7ff8187eb578) at mdb/libraries/liblmdb/mdb.c:9451
#2 0x0000565508126b7b in lmdb_zero::env::Environment::info (self=0x5655221205f0) at src/env.rs:486
#3 0x00005655081111dd in grin_store::lmdb::Store::needs_resize (self=0x56552211dd48) at store/src/lmdb.rs:188
#4 0x00005655081132a9 in grin_store::lmdb::Store::batch (self=0x56552211dd48) at store/src/lmdb.rs:324
#5 0x0000565507fc20ba in grin_p2p::store::PeerStore::update_state (self=0x56552211dd48,
peer_addr=<error reading variable: Cannot access memory at address 0x28>, new_state=grin_p2p::store::State::Defunct)
at p2p/src/store.rs:195
#6 0x0000565507f462d6 in grin_p2p::peers::Peers::update_state (self=0x56552211dc80, peer_addr=...,
new_state=grin_p2p::store::State::Defunct) at p2p/src/peers.rs:324
#7 0x00005655077ee2a3 in grin_servers::grin::seed::listen_for_addrs::{closure#0} () at servers/src/grin/seed.rs:390
#8 0x0000565507895f36 in std::sys::backtrace::__rust_begin_short_backtrace<grin_servers::grin::seed::listen_for_addrs::{closure_env#0}, ()> (f=...)
at /home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/sys/backtrace.rs:166
#9 0x0000565507894e8b in std::thread::lifecycle::spawn_unchecked::{closure#1}::{closure#0}<grin_servers::grin::seed::listen_for_addrs::{closure_env#0}, ()> ()
at /home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/lifecycle.rs:91
#10 0x000056550788a3f1 in core::panic::unwind_safe::{impl#23}::call_once<(), std::thread::lifecycle::spawn_unchecked::{closure#1}::{closure_env#0}<grin_servers::grin::seed::listen_for_addrs::{closure_env#0}, ()>> (self=...)
at /home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/panic/unwind_safe.rs:274
#11 0x0000565507883a47 in std::panicking::catch_unwind::do_call<core::panic::unwind_safe::AssertUnwindSafe<std::thread::lifecycle::spawn_unchecked::{closure#1}::{closure_env#0}<grin_servers::grin::seed::listen_for_addrs::{closure_env#0}, ()>>, ()> (data=0x7ff8187ec928)
at /home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:581
#12 0x0000565507895f0b in __rust_try ()
#13 0x00005655078928c4 in std::panicking::catch_unwind<(), core::panic::unwind_safe::AssertUnwindSafe<std::thread::lifecycle::spawn_unchecked::{closure#1}::{closure_env#0}<grin_servers::grin::seed::listen_for_addrs::{closure_env#0}, ()>>> (f=...)
at /home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:544
#14 std::panic::catch_unwind<core::panic::unwind_safe::AssertUnwindSafe<std::thread::lifecycle::spawn_unchecked::{closure#1}::{closure_env#0}<grin_servers::grin::seed::listen_for_addrs::{closure_env#0}, ()>>, ()> (f=...)
at /home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panic.rs:359
#15 std::thread::lifecycle::spawn_unchecked::{closure#1}<grin_servers::grin::seed::listen_for_addrs::{closure_env#0}, ()> ()
at /home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/lifecycle.rs:89
#16 0x00005655078395cf in core::ops::function::FnOnce::call_once<std::thread::lifecycle::spawn_unchecked::{closure_env#1}<grin_servers::grin::seed::listen_for_addrs::{closure_env#0}, ()>, ()> ()
--Type <RET> for more, q to quit, c to continue without paging--
at /home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:250
#17 0x000056550865845f in alloc::boxed::{impl#31}::call_once<(), (dyn core::ops::function::FnOnce<(), Output=()> + core::marker::Send), alloc::alloc::Global> () at library/alloc/src/boxed.rs:2240
#18 std::sys::thread::unix::{impl#2}::new::thread_start () at library/std/src/sys/thread/unix.rs:118
#19 0x00007ff82418ab7b in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:448
#20 0x00007ff8242087b8 in __GI___clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78
Sometimes it can be re-produced, sometimes not. Tried to sync a fresh node and got a coredump: