Location of corefile is in note 3 of issue 32557

Marko, here's the requested output (I don't have datadir, so cannot do this on debug build of mysqld)

(gdb) frame 4
#4 0x00000000008f8676 in rec_set_nth_field_sql_null (rec=0x2aaaae0dbe42 "\200\005ë@", n=45) at rem0rec.c:715
715 data_write_sql_null(rec + offset, rec_get_nth_field_size(rec, n));
Current language: auto; currently c
(gdb) p/x rec[-6-2*n]@106+2*n
$1 = {0x31,
0x81,
0x0,
0x0,
0x0,
0x81,
0x0,
0x0,
0x0,
0x81,
0x80,
0x80,
0x81,
0x80,
0x80,
0x0,
0x0,
0x1,
0x80,
0x2d,
0x0,
0x0,
0x4e,
0x69,
0x74,
0x7a,
0x61,
0x20,
0x45,
0x73,
0x70,
0x61,
0x69,
0x6c,
0x6c,
0x61,
0x74,
0x0,
0x0,
0xa0,
0x40,
0x1,
0x1,
0x80,
0x80,
0x1,
0x2,
0x2,
0x0,
0x0,
0x80,
0x3e,
0xcd,
0xcc,
0x4c,
0x3d,
0x0,
0x0,
0x0,
0x0,
0xe,
0x7,
0x0,
0xd,
0x0,
0xd,
0x5,
0xa,
0xb,
0x10,
0xe,
0xc,
0x5,
0xa,
0xb,
0x10,
0x17,
0x0,
0x0,
0xe,
0x4,
0xa,
0xd,
0xe,
0x0,
0x76,
0xbe,
0x42,
0xe0,
0x5,
0x2d,
0x0,
0x1,
0xd0,
0xfb,
0x6c,
0x80,
0x5,
0xeb,
0x40,
0x0,
0x0,
0x3b,
0x57,
0x95,
0x1,
0x0,
0x0,
0x0,
0x0,
0x33,
0x1,
0x10,
0x80,
0x0,
0x0,
0xa,
0x80,
0x0,
0x0,
0x0,
0x32,
0x30,
0x30,
0x39,
0x30,
0x31,
0x31,
0x35,
0x30,
0x30,
0x30,
0x30,
0x30,
0x30,
0x63,
0x68,
0x72,
0x69,
0x73,
0x74,
0x69,
0x61,
0x6e,
0x72,
0x69,
0x63,
0x68,
0x80,
0x0,
0x0,
0x1,
0x80,
0x0,
0x0,
0x1,
0x80,
0x0,
0x0,
0x0,
0x43,
0x68,
0x72,
0x69,
0x73,
0x74,
0x69,
0x61,
0x6e,
0x20,
0x52,
0x69,
0x63,
0x68,
0x63,
0x68,
0x72,
0x69,
0x73,
0x74,
0x69,
0x61,
0x6e,
0x20,
0x72,
0x69,
0x63,
0x68,
0x63,
0x68,
0x72,
0x69,
0x73,
0x74,
0x69,
0x61}
(gdb) up 2
#6 0x0000000000850991 in btr_cur_optimistic_update (flags=46912552943170, cursor=0x2d, update=0xd, cmpl_info=46912552955843, thr=0x4488e02d, mtr=0xfffffffffffff3ed) at btr0cur.c:1582
1582 return(btr_cur_update_in_place(flags, cursor, update,
(gdb) p *index
Cannot access memory at address 0x0
(gdb) print index
$2 = (dict_index_t *) 0x0
(gdb) frame 5
#5 0x00000000008209ef in row_upd_rec_in_place (rec=0x2aaaae0dbe42 "\200\005ë@", offsets=0x2d, update=0xd) at row0upd.c:457
457 rec_set_nth_field(rec, offsets, upd_field->field_no,
(gdb) info locals
new_val = (dfield_t *) 0xb0
(gdb)



(gdb) frame 6
#6 0x0000000000850991 in btr_cur_optimistic_update (flags=46912552943170, cursor=0x2d, update=0xd, cmpl_info=46912552955843, thr=0x4488e02d, mtr=0xfffffffffffff3ed) at btr0cur.c:1582
1582 return(btr_cur_update_in_place(flags, cursor, update,
(gdb) info locals
index = (dict_index_t *) 0x0
err = 18446744073709548529
max_size = 13
new_rec_size = 18446744073709548529
roll_ptr = {
high = 2147483684,
low = 4
}
heap = (mem_heap_t *) 0x2aaaadcf5048
i = 45
(gdb) print *heap
$9 = {
magic_n = 547711122,
file_name = "r0cur.c",
line = 1564,
base = {
count = 0,
start = 0x0,
end = 0x0
},
list = {
prev = 0x0,
next = 0x0
},
len = 1136,
type = 0,
init_block = 0,
free = 768,
start = 112,
free_block = 0x0
}
(gdb)




(gdb) frame 7
#7 0x0000000000824218 in row_undo_mod (node=0x2aaaae0dbe42, thr=0x2d) at row0umod.c:761
761 err = row_undo_mod_clust(node, thr);
(gdb) info locals
found = 18446744073709548529
(gdb) print *node
$12 = {
common = {
type = 6285617706014803328,
parent = 0x133000000000195,
brother = 0x800a00008010,
val = {
data = 0x3131303930303200,
len = 7147265592162005045,
type = {
mtype = 7953754365786419816,
prtype = 72058145545087346,
len = 549772591232,
prec = 7019269533272795203,
mbminlen = 7521970578816901230,
mbmaxlen = 2336912362205047154
}
},
val_buf_size = 7598250297489844594
},
state = 7163382500715754611,
trx = 0x2e6c69616d674068,
roll_ptr = {
high = 2320251229473435491,
low = 2336349450906002755
},
undo_rec = 0x6e6f696e55657641 <Address 0x6e6f696e55657641 out of bounds>,
undo_no = {
high = 7299807752030339872,
low = 8747524786399879287
},
rec_type = 3760563100624893744,
new_roll_ptr = {
high = 3976740237701690925,
low = 3689065162166252081
},
new_trx_id = {
high = 3618137848919175217,
low = 8389754494815252531
},
pcur = {
btr_cur = {
index = 0x55657641206c6172,
page_cur = {
rec = 0x746943206e6f696e <Address 0x746943206e6f696e out of bounds>
},
left_page = 0x654a2077654e2079 <Address 0x654a2077654e2079 out of bounds>,
thr = 0x3830373079657372,
flag = 3675640983376101431,
tree_height = 7597103079908999226,
up_match = 8386111881515132276,
up_bytes = 7234316372612051813,
low_match = 9255853209702126368,
low_bytes = 7310590619388477696,
n_fields = 36310272004141426,
n_bytes = 9259543222785474560,
fold = 7133702005175943168,
path_arr = 0x6e61697473697268
},
latch_mode = 11529215494412923424,
old_stored = 144679789444268352,
old_rec = 0x3d4ccccd3e800000 <Address 0x3d4ccccd3e800000 out of bounds>,
old_n_fields = 0,
rel_pos = 0,
block_when_stored = 0x0,
modify_clock = {
high = 0,
low = 0
},
pos_state = 0,
search_mode = 0,
trx_if_known = 0x0,
mtr = 0x0,
old_rec_buf = 0x0,
buf_size = 11613948030876151808
},
table = 0x4d1e8d222326a729,
cmpl_info = 15495705508514638873,
update = 0x6300ef032e08,
ref = 0xcdf2f8a185640900,
row = 0xa2220000e497,
index = 0xffffffffa122,
heap = 0xbf457c9885640900
}





(gdb) bt full
#0 0x00002b914633d797 in pthread_kill () from /users/sbester/32557/lib/libpthread.so.0
No symbol table info available.
#1 0x0000000000787873 in write_core (sig=22128) at stacktrace.c:254
No locals.
#2 0x00000000005e113f in handle_segfault (sig=22128) at mysqld.cc:2375
curr_time = 1230758693
tm = {
tm_sec = 53,
tm_min = 24,
tm_hour = 16,
tm_mday = 31,
tm_mon = 11,
tm_year = 108,
tm_wday = 3,
tm_yday = 365,
tm_isdst = 0,
tm_gmtoff = -18000,
tm_zone = 0xf49430 "EST"
}
#3 <signal handler called>
No symbol table info available.
#4 0x00000000008f8676 in rec_set_nth_field_sql_null (rec=0x2aaaae0dbe42 "\200\005ë@", n=45) at rem0rec.c:715
No locals.
#5 0x00000000008209ef in row_upd_rec_in_place (rec=0x2aaaae0dbe42 "\200\005ë@", offsets=0x2d, update=0xd) at row0upd.c:457
new_val = (dfield_t *) 0xb0
#6 0x0000000000850991 in btr_cur_optimistic_update (flags=46912552943170, cursor=0x2d, update=0xd, cmpl_info=46912552955843, thr=0x4488e02d, mtr=0xfffffffffffff3ed) at btr0cur.c:1582
index = (dict_index_t *) 0x0
err = 18446744073709548529
max_size = 13
new_rec_size = 18446744073709548529
roll_ptr = {
high = 2147483684,
low = 4
}
heap = (mem_heap_t *) 0x2aaaadcf5048
i = 45
#7 0x0000000000824218 in row_undo_mod (node=0x2aaaae0dbe42, thr=0x2d) at row0umod.c:761
found = 18446744073709548529
#8 0x000000000081bf1e in row_undo_step (thr=0x2aaaae0dbe42) at row0undo.c:326
err = 0
node = (undo_node_t *) 0x2aaaadcc08b8
#9 0x00000000007eb8ca in que_run_threads (thr=0x2aaaae0dbe42) at que0que.c:1248
next_thr = (que_thr_t *) 0x2aaaadcc01d0
#10 0x000000000086da13 in trx_rollback_or_clean_all_without_sess (arg=0x2aaaae0dbe42) at trx0roll.c:537
trx = (trx_t *) 0x2aaaadcb78b8
rows_to_undo = 46912547873464
unit = 0xae5174 ""
#11 0x00002b9146339f1a in start_thread () from /users/sbester/32557/lib/libpthread.so.0
No symbol table info available.
#12 0x00002b9146abc5d2 in clone () from /users/sbester/32557/lib/libc.so.6
No symbol table info available.
Cannot access memory at address 0x2b9146abc560
(gdb)