Dear Maintainer,
just in case it may be of any help.
I guess the dmesg line points to function screen_write_collect_end
in screen-write.c:1240.
Kind regards,
Bernhard
# Bullseye/testing amd64 qemu VM 2019-09-16
apt update
apt dist-upgrade
# testing -> unstable
apt update
apt dist-upgrade
reboot
apt install systemd-coredump fakeroot gdb tmux tmux-dbgsym
apt build-dep tmux
mkdir /home/benutzer/source/tmux/orig -p
cd/home/benutzer/source/tmux/orig
apt source tmux
cd
tmux
gdb -q --pid $(pidof tmux)
set width 0
set pagination off
directory /home/benutzer/source/tmux/orig/tmux-2.9a
info target
...
0x55d3db9adc80 - 0x55d3dba0c921 is .text
...
# [173131.642703] Code: 48 c7 85 30 01 00 00 00 00 00 00 89 45 00 41 8b 47 1c
48 c1 e0 04 48 03 47 18 bf 01 00 00 00 48 8b 50 08 48 89 95 38 01 00 00 <48> 89
2a 48 8d 95 30 01 00 00 48 89 50 08 e8 79 55 02 00 8b 55 08
# 48 c7 85 30 01 00 00 00 00 00 00 89 45 00 41 8b 47 1c 48 c1 e0 04 48 03 47 18
bf 01 00 00 00 48 8b 50 08 48 89 95 38 01 00 00 48 89 2a 48 8d 95 30 01 00 00
48 89 50 08 e8 79 55 02 00 8b 55 08
# 0x48, 0xc7, 0x85, 0x30, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x89, 0x45,
0x00, 0x41, 0x8b, 0x47, 0x1c, 0x48, 0xc1, 0xe0, 0x04, 0x48, 0x03, 0x47, 0x18,
0xbf, 0x01, 0x00, 0x00, 0x00, 0x48, 0x8b, 0x50, 0x08, 0x48, 0x89, 0x95, 0x38,
0x01, 0x00, 0x00, 0x48, 0x89, 0x2a, 0x48, 0x8d, 0x95, 0x30, 0x01, 0x00, 0x00,
0x48, 0x89, 0x50, 0x08, 0xe8, 0x79, 0x55, 0x02, 0x00, 0x8b, 0x55, 0x08
(gdb) find /b 0x55d3db9adc80, 0x55d3dba0c921, 0x48, 0xc7, 0x85, 0x30,
0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x89, 0x45, 0x00, 0x41, 0x8b, 0x47,
0x1c, 0x48, 0xc1, 0xe0, 0x04, 0x48, 0x03, 0x47, 0x18, 0xbf, 0x01, 0x00, 0x00,
0x00, 0x48, 0x8b, 0x50, 0x08, 0x48, 0x89, 0x95, 0x38, 0x01, 0x00, 0x00, 0x48,
0x89, 0x2a, 0x48, 0x8d, 0x95, 0x30, 0x01, 0x00, 0x00, 0x48, 0x89, 0x50, 0x08,
0xe8, 0x79, 0x55, 0x02, 0x00, 0x8b, 0x55, 0x08
0x55d3db9e417a
1 pattern found.
(gdb) print/x 0x55d3db9e417a + 42
$1 = 0x55d3db9e41a4
(gdb) b *0x55d3db9e41a4
Breakpoint 1 at 0x55d3db9e41a4: file screen-write.c, line 1240.
(gdb) info break
Num Type Disp Enb AddressWhat
1 breakpoint keep y 0x55d3db9e41a4 in screen_write_collect_end
at screen-write.c:1240
(gdb) list screen-write.c:1240
1235if (ci->used == 0)
1236return;
1237ci->data[ci->used] = '\0';
1238
1239ci->x = s->cx;
1240TAILQ_INSERT_TAIL(&ctx->list[s->cy].items, ci, entry);
1241ctx->item = xcalloc(1, sizeof *ctx->item);
1242
1243log_debug("%s: %u %s (at %u,%u)", __func__, ci->used, ci->data,
s->cx,
1244s->cy);
(gdb) print/x $rdx
$2 = 0x55d3dd642800
(gdb) print ctx->list[1]
$3 = {items = {tqh_first = 0x0, tqh_last = 0x55d3dd642800}}
(gdb) print ctx->s->cy
$4 = 1
