Dear Maintainer, I just came across this report and want to note that since ASLR got quite common the addr2line method is unreliable.
Therefore I want to point to here [1], were another method is described to find out the source line where a crash happened. Attached file contains this exercised for the given output in the first message. This would point to [3], folderview.c, line 2339. The most convenient way I guess is to install a coredump collector, and inspect that after a crash like in [2] you already mentioned. Kind regards, Bernhard [1] https://wiki.debian.org/InterpretingKernelOutputAtProcessCrash [2] https://wiki.debian.org/HowToGetABacktrace [3] https://sources.debian.org/src/claws-mail/3.17.3-2/src/folderview.c/#L2339
dmesg: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=972928#5 [Mon Oct 26 10:23:55 2020] claws-mail[1879911]: segfault at 1f ip 00000000004a35bd sp 00007ffe5872a4e0 error 4 in claws-mail[442000+230000] [Mon Oct 26 10:23:55 2020] Code: 30 85 c0 0f 84 a4 02 00 00 c7 05 3e f6 2e 00 00 00 00 00 31 f6 48 89 df e8 c0 fc ff ff 49 8b 84 24 88 00 00 00 48 85 c0 74 19 <48> 8b 00 31 f6 83 38 04 48 8b 43 50 40 0f 94 c6 48 8b 78 30 e8 5a https://wiki.debian.org/InterpretingKernelOutputAtProcessCrash 0: no page found 0: read access 1: user-mode access benutzer@debian:~$ echo -n "find /b ..., ..., 0x" && \ > echo "30 85 c0 0f 84 a4 02 00 00 c7 05 3e f6 2e 00 00 00 00 00 31 f6 48 89 df > e8 c0 fc ff ff 49 8b 84 24 88 00 00 00 48 85 c0 74 19 <48> 8b 00 31 f6 83 38 > 04 48 8b 43 50 40 0f 94 c6 48 8b 78 30 e8 5a" \ > | sed 's/[<>]//g' | sed 's/ /, 0x/g' find /b ..., ..., 0x30, 0x85, 0xc0, 0x0f, 0x84, 0xa4, 0x02, 0x00, 0x00, 0xc7, 0x05, 0x3e, 0xf6, 0x2e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x31, 0xf6, 0x48, 0x89, 0xdf, 0xe8, 0xc0, 0xfc, 0xff, 0xff, 0x49, 0x8b, 0x84, 0x24, 0x88, 0x00, 0x00, 0x00, 0x48, 0x85, 0xc0, 0x74, 0x19, 0x48, 0x8b, 0x00, 0x31, 0xf6, 0x83, 0x38, 0x04, 0x48, 0x8b, 0x43, 0x50, 0x40, 0x0f, 0x94, 0xc6, 0x48, 0x8b, 0x78, 0x30, 0xe8, 0x5a benutzer@debian:~$ ################ # Buster/stable amd64 qemu VM 2020-11-02 apt update apt dist-ugprade apt install systemd-coredump gdb claws-mail claws-mail-dbgsym gdb -q set width 0 set pagination off file /usr/bin/claws-mail tb main run info target 0x0000000000448cb0 - 0x00000000006715b1 is .text (gdb) find /b 0x0000000000448cb0, 0x00000000006715b1, 0x30, 0x85, 0xc0, 0x0f, 0x84, 0xa4, 0x02, 0x00, 0x00, 0xc7, 0x05, 0x3e, 0xf6, 0x2e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x31, 0xf6, 0x48, 0x89, 0xdf, 0xe8, 0xc0, 0xfc, 0xff, 0xff, 0x49, 0x8b, 0x84, 0x24, 0x88, 0x00, 0x00, 0x00, 0x48, 0x85, 0xc0, 0x74, 0x19, 0x48, 0x8b, 0x00, 0x31, 0xf6, 0x83, 0x38, 0x04, 0x48, 0x8b, 0x43, 0x50, 0x40, 0x0f, 0x94, 0xc6, 0x48, 0x8b, 0x78, 0x30, 0xe8, 0x5a 0x4a3593 <folderview_selected+387> 1 pattern found. (gdb) b * (0x4a3593 + 42) Breakpoint 2 at 0x4a35bd: file folderview.c, line 2339. (gdb) info b Num Type Disp Enb Address What 2 breakpoint keep y 0x00000000004a35bd in folderview_selected at folderview.c:2339 (gdb) disassemble /r 0x4a3593, 0x4a3593 + 62 Dump of assembler code from 0x4a3593 to 0x4a35d1: 0x00000000004a3593 <folderview_selected+387>: 30 85 c0 0f 84 a4 xor %al,-0x5b7bf040(%rbp) 0x00000000004a3599 <folderview_selected+393>: 02 00 add (%rax),%al 0x00000000004a359b <folderview_selected+395>: 00 c7 add %al,%bh 0x00000000004a359d <folderview_selected+397>: 05 3e f6 2e 00 add $0x2ef63e,%eax 0x00000000004a35a2 <folderview_selected+402>: 00 00 add %al,(%rax) 0x00000000004a35a4 <folderview_selected+404>: 00 00 add %al,(%rax) 0x00000000004a35a6 <folderview_selected+406>: 31 f6 xor %esi,%esi 0x00000000004a35a8 <folderview_selected+408>: 48 89 df mov %rbx,%rdi 0x00000000004a35ab <folderview_selected+411>: e8 c0 fc ff ff callq 0x4a3270 <folderview_close_opened> 0x00000000004a35b0 <folderview_selected+416>: 49 8b 84 24 88 00 00 00 mov 0x88(%r12),%rax 0x00000000004a35b8 <folderview_selected+424>: 48 85 c0 test %rax,%rax 0x00000000004a35bb <folderview_selected+427>: 74 19 je 0x4a35d6 <folderview_selected+454> 0x00000000004a35bd <folderview_selected+429>: >>> 48 8b 00 mov (%rax),%rax 0x00000000004a35c0 <folderview_selected+432>: 31 f6 xor %esi,%esi 0x00000000004a35c2 <folderview_selected+434>: 83 38 04 cmpl $0x4,(%rax) 0x00000000004a35c5 <folderview_selected+437>: 48 8b 43 50 mov 0x50(%rbx),%rax 0x00000000004a35c9 <folderview_selected+441>: 40 0f 94 c6 sete %sil 0x00000000004a35cd <folderview_selected+445>: 48 8b 78 30 mov 0x30(%rax),%rdi End of assembler dump. (gdb) print 0x88 $2 = 136 (gdb) ptype /o FolderView type = struct _FolderView { /* 0 | 8 */ GtkWidget *scrolledwin; /* 8 | 8 */ GtkWidget *ctree; /* 16 | 8 */ GtkWidget *headerpopupmenu; /* 24 | 8 */ GHashTable *popups; /* 32 | 8 */ GtkCMCTreeNode *selected; /* 40 | 8 */ GtkCMCTreeNode *opened; /* 48 | 4 */ gboolean open_folder; /* 52 | 12 */ GdkColor color_new; /* 64 | 12 */ GdkColor color_op; /* XXX 4-byte hole */ /* 80 | 8 */ MainWindow *mainwin; /* 88 | 8 */ SummaryView *summaryview; /* 96 | 4 */ gint folder_update_callback_id; /* 100 | 4 */ gint folder_item_update_callback_id; /* 104 | 8 */ GSList *nodes_to_recollapse; /* 112 | 4 */ guint drag_timer_id; /* XXX 4-byte hole */ /* 120 | 8 */ FolderItem *drag_item; /* 128 | 8 */ GtkCMCTreeNode *drag_node; /* 136 | 8 */ GtkTargetList *target_list; /* 144 | 32 */ FolderColumnState col_state[4]; /* 176 | 16 */ gint col_pos[4]; /* 192 | 8 */ Folder *scanning_folder; /* 200 | 8 */ GtkUIManager *ui_manager; /* 208 | 8 */ GtkActionGroup *popup_common_action_group; /* 216 | 8 */ GtkActionGroup *popup_specific_action_group; /* 224 | 4 */ gint scroll_value; /* 228 | 4 */ guint deferred_refresh_id; /* 232 | 4 */ guint scroll_timeout_id; /* 236 | 4 */ guint postpone_select_id; /* total size (bytes): 240 */ } (gdb) ptype /o MainWindow type = struct _MainWindow { /* 0 | 8 */ GtkWidget *hpaned; /* 8 | 8 */ GtkWidget *vpaned; /* 16 | 8 */ GtkWidget *window; /* 24 | 8 */ GtkWidget *vbox; /* 32 | 8 */ GtkWidget *menubar; /* 40 | 8 */ GtkWidget *handlebox; /* 48 | 8 */ Toolbar *toolbar; /* 56 | 8 */ GtkWidget *vbox_body; /* 64 | 8 */ GtkWidget *hbox_stat; /* 72 | 8 */ GtkWidget *statusbar; /* 80 | 8 */ GtkWidget *progressbar; /* 88 | 8 */ GtkWidget *statuslabel; /* 96 | 8 */ GtkWidget *ac_button; /* 104 | 8 */ GtkWidget *ac_label; /* 112 | 8 */ GtkWidget *ac_menu; /* 120 | 8 */ GtkWidget *online_switch; /* 128 | 8 */ GtkWidget *offline_switch; /* 136 | 8 */ GtkWidget *online_pixmap; /* 144 | 8 */ GtkWidget *offline_pixmap; /* 152 | 4 */ gint mainwin_cid; /* 156 | 4 */ gint folderview_cid; /* 160 | 4 */ gint summaryview_cid; /* 164 | 4 */ gint messageview_cid; /* 168 | 4 */ ToolbarStyle toolbar_style; /* 172 | 4 */ guint lock_count; /* 176 | 4 */ guint menu_lock_count; /* 180 | 4 */ guint cursor_count; /* 184 | 8 */ FolderView *folderview; /* 192 | 8 */ SummaryView *summaryview; /* 200 | 8 */ MessageView *messageview; /* 208 | 8 */ LogWindow *logwin; /* 216 | 8 */ LogWindow *filtering_debugwin; /* 224 | 4 */ gint progressindicator_hook; /* XXX 4-byte hole */ /* 232 | 8 */ GtkWidget *colorlabel_menu; /* 240 | 8 */ GtkWidget *warning_btn; /* 248 | 8 */ GtkWidget *tags_menu; /* 256 | 4 */ gboolean in_folder; /* XXX 4-byte hole */ /* 264 | 8 */ GtkActionGroup *action_group; /* 272 | 8 */ GtkUIManager *ui_manager; /* 280 | 8 */ gpointer smc_conn; /* total size (bytes): 288 */ } https://sources.debian.org/src/claws-mail/3.17.3-2/src/folderview.c/#L2339 https://git.claws-mail.org/?p=claws.git;a=blob;f=src/folderview.c;h=263d3d8d7e0da309b7394bcfdb359c39787d1419;hb=HEAD#l2308 https://thewildbeast.co.uk/claws-mail/bugzilla/buglist.cgi?bug_status=__all__&content=folderview_selected&no_redirect=0&query_format=specific&order=bug_id%20DESC&query_based_on=
