The error from your reports looks like bug #1854812 with this stacktrace

'#0  tcache_get (tc_idx=<optimized out>) at malloc.c:2937
        e = 0x7f3000000002
#1  __GI___libc_malloc (bytes=32) at malloc.c:3051
        ar_ptr = <optimized out>
        victim = <optimized out>
        hook = <optimized out>
        tbytes = <optimized out>
        tc_idx = <optimized out>
        __PRETTY_FUNCTION__ = "__libc_malloc"
#2  0x00007f30a77944e9 in g_malloc () from 
/srv/daisy.ubuntu.com/production/cache/Ubuntu 19.10/cache-8mCgcG/sandbox/Ubuntu 
19.10/amd64/report-sandbox/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#3  0x00007f30a778c509 in g_source_set_callback () from 
/srv/daisy.ubuntu.com/production/cache/Ubuntu 19.10/cache-8mCgcG/sandbox/Ubuntu 
19.10/amd64/report-sandbox/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#4  0x00007f30a7974b24 in g_task_attach_source (task=0x7f309801b3c0, 
source=0x5643e2f49800, callback=0x7f30a7974060 <complete_in_idle_cb>) at 
../../../gio/gtask.c:1616
        __FUNCTION__ = "g_task_attach_source"
#5  0x00007f30a7974bc4 in g_task_return (task=0x7f309801b3c0, type=<optimized 
out>) at ../../../gio/gtask.c:1291
        source = 0x5643e2f49800
#6  0x00007f30a793e0df in read_async_pollable (stream=0x7f3090001560, 
task=task@entry=0x7f309801b3c0) at ../../../gio/ginputstream.c:1365
        op = <optimized out>
        error = 0x0
        nread = 2084
#7  0x00007f30a794002d in g_input_stream_real_read_async 
(stream=0x7f3090001560, buffer=0x5643e2f49cc0, count=32777, io_priority=0, 
cancellable=<optimized out>, callback=0x7f30a793fce0 
<async_ready_callback_wrapper>, user_data=0x5643e2ec6148) at 
../../../gio/ginputstream.c:1391
        task = 0x7f309801b3c0
        op = 0x7f309001a580
#8  0x00007f30a793ef1a in g_input_stream_read_async (stream=0x7f3090001560, 
buffer=0x5643e2f49cc0, count=32777, io_priority=io_priority@entry=0, 
cancellable=cancellable@entry=0x0, callback=callback@entry=0x5643e167a6b0 
<read_reply_async_got_data>, user_data=0x5643e2ec6148) at 
../../../gio/ginputstream.c:633
        class = 0x7f309000a5d0
        error = 0x0
        __FUNCTION__ = "g_input_stream_read_async"
#9  0x00005643e167a640 in read_reply_async_got_len 
(source_object=0x7f3090001560, result=<optimized out>, 
user_data=0x5643e2ec6148) at ../daemon/gvfsbackendsftp.c:1502
        conn = 0x5643e2ec6148
        res = <optimized out>
        error = 0x0
#10 0x00007f30a793fd2b in async_ready_callback_wrapper 
(source_object=0x7f3090001560, res=0x7f3098003d60, user_data=0x5643e2ec6148) at 
../../../gio/ginputstream.c:532
        stream = 0x7f3090001560
#11 0x00007f30a7974029 in g_task_return_now (task=0x7f3098003d60) at 
../../../gio/gtask.c:1212
No locals.'


It looks like an upstream issue and you would probaly have more chance to get a 
reply on https://gitlab.gnome.org/GNOME/gvfs/issues if you could sent it there?

** Package changed: nautilus (Ubuntu) => gvfs (Ubuntu)

** Changed in: gvfs (Ubuntu)
       Status: Incomplete => New

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https://bugs.launchpad.net/bugs/1853961

Title:
  Nautilus segfaults while transferring files via SFTP

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