...
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffe22c2700 (LWP 29080)]
0x00007ffff07bddf1 in RC4 () from /usr/lib/libcrypto.so.1.0.0
(gdb) 
(gdb) thread apply all bt

Thread 2 (Thread 0x7fffe22c2700 (LWP 29080)):
#0  0x00007ffff07bddf1 in RC4 () from /usr/lib/libcrypto.so.1.0.0
#1  0x000000000000087e in ?? ()
#2  0x00007fffdc011af2 in ?? ()
#3  0x00007fffdc01b140 in ?? ()
#4  0x00007ffff0852619 in rc4_hmac_md5_cipher () from /usr/lib/libcrypto.so.1.0.0
#5  0x00007ffff0b6a69c in tls1_enc () from /usr/lib/libssl.so.1.0.0
#6  0x00007ffff0b6137c in do_ssl3_write.constprop.0 () from /usr/lib/libssl.so.1.0.0
#7  0x00007ffff0b616e2 in ssl3_write_bytes () from /usr/lib/libssl.so.1.0.0
#8  0x00007ffff44bd1d7 in ?? () from /usr/lib/libetpan.so.15
#9  0x00007ffff44bc338 in mailstream_flush () from /usr/lib/libetpan.so.15
#10 0x00007ffff44d25ec in mailimap_authenticate () from /usr/lib/libetpan.so.15
#11 0x000000000063e1b8 in login_run (op=0xd4a250) at imap-thread.c:934
#12 0x000000000066b989 in thread_run (data=0xdff960) at etpan-thread-manager.c:344
#13 0x00007ffff518be0e in start_thread () from /lib/libpthread.so.0
#14 0x00007ffff41d31ed in clone () from /lib/libc.so.6

Thread 1 (Thread 0x7ffff7fb8900 (LWP 29068)):
#0  0x00007ffff41cb06f in poll () from /lib/libc.so.6
#1  0x00007ffff4a7edc8 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007ffff4a7f289 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007ffff749c841 in gtk_main_iteration () from /usr/lib/libgtk-x11-2.0.so.0
#4  0x000000000063d179 in threaded_run (folder=0xdedbe0, param=0x7fffffff74c0, result=0x7fffffff74b0, 
    func=0x63e0a9 <login_run>) at imap-thread.c:442
#5  0x000000000063e360 in imap_threaded_login (folder=0xdedbe0, login=0xd897a0 "warm", 
    password=0x6f0125 "", type=0x6f014a "GSSAPI") at imap-thread.c:971
#6  0x0000000000500762 in imap_cmd_login (session=0xe8c070, user=0xd897a0 "warm", pass=0x6f0125 "", 
    type=0x6f014a "GSSAPI") at imap.c:3574
#7  0x00000000004f8e7c in imap_auth (session=0xe8c070, user=0xd897a0 "warm", pass=0x6f0125 "", 
    type=IMAP_AUTH_GSSAPI) at imap.c:856
#8  0x00000000004f9bbe in imap_session_authenticate (session=0xe8c070, account=0xd89420) at imap.c:1197
#9  0x00000000004f946e in imap_session_get (folder=0xdedbe0) at imap.c:990
#10 0x000000000050247a in imap_scan_required (folder=0xdedbe0, _item=0xdf6b80) at imap.c:4276
#11 0x00000000004d9e8c in folder_item_process_open (item=0xdf6b80, before_proc_func=0, 
    after_proc_func=0, data=0x0) at folder.c:2006
#12 0x00000000004da028 in folder_item_open (item=0xdf6b80) at folder.c:2042
#13 0x00000000004ee11d in folderview_selected (ctree=0xaaa400, row=0xde7280, column=-1, 
    folderview=0xc280b0) at folderview.c:2189
---Type <return> to continue, or q <return> to quit---
#14 0x00000000006dade7 in claws_marshal_VOID__POINTER_INT (closure=0xc6b290, return_value=0x0, 
    n_param_values=3, param_values=0xe21b70, invocation_hint=0x7fffffff79c0, marshal_data=0x0)
    at claws-marshal.c:348
#15 0x00007ffff4f430e4 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#16 0x00007ffff4f5506a in ?? () from /usr/lib/libgobject-2.0.so.0
#17 0x00007ffff4f5e6f1 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#18 0x00007ffff4f5e892 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#19 0x0000000000691ccc in gtk_cmctree_select (ctree=0xaaa400, node=0xde7280) at gtkcmctree.c:3899
#20 0x000000000068bdc1 in real_unselect_all (clist=0xaaa400) at gtkcmctree.c:2882
#21 0x00000000006c03a3 in gtk_sctree_real_unselect_all (clist=0xaaa400) at gtksctree.c:787
#22 0x00000000006a88f7 in gtk_cmclist_unselect_all (clist=0xaaa400) at gtkcmclist.c:3575
#23 0x00000000006be1a1 in select_row (sctree=0xaaa400, row=21, col=0, state=0, _node=0x0)
    at gtksctree.c:383
#24 0x00000000006bf0d1 in gtk_sctree_button_press (widget=0xaaa400, event=0xda99e0) at gtksctree.c:549
#25 0x00007ffff749f0f8 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#26 0x00007ffff4f430e4 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#27 0x00007ffff4f54e9f in ?? () from /usr/lib/libgobject-2.0.so.0
#28 0x00007ffff4f5e4c3 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#29 0x00007ffff4f5e892 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#30 0x00007ffff75b8171 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#31 0x00007ffff749d283 in gtk_propagate_event () from /usr/lib/libgtk-x11-2.0.so.0
#32 0x00007ffff749d5e3 in gtk_main_do_event () from /usr/lib/libgtk-x11-2.0.so.0
#33 0x00007ffff711284c in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#34 0x00007ffff4a7e8bd in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#35 0x00007ffff4a7f0b8 in ?? () from /usr/lib/libglib-2.0.so.0
#36 0x00007ffff4a7f5f2 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#37 0x00007ffff749c637 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#38 0x0000000000529e2c in main (argc=1, argv=0x7fffffffe7d8) at main.c:1653