On Wed, 2010-10-06 at 13:37 -0400, Victor Duchovni wrote:
> On Wed, Oct 06, 2010 at 12:28:45PM -0500, Vernon A. Fort wrote:
>
> > > We don't yet need the whole core file, just run:
> > >
> > > gdb /usr/sbin/postscreen /path/to/core
> > > ... copious output ...
> > > gdb) bt
> > >
> > > The "bt" command generates a back-trace (stack trace), that should show
> > > where the segfault occurred. Ideally, your postscreen is compiled with
> > > "-g" or "-g -O", i.e. with symbols and line numbers, ...
> > >
> >
> > attached. This is a gentoo install so added the "ggdb" flag to the
> > make.conf file and re-compiled postfix. I also removed the
> > -fomit-frame-pointer per the backtrace doc's.
>
> Sadly, the binary still has no symbols. It should be compiled with
> "-g" or "-g -O" and installed without being stripped, although that
> is not too hard to fix, by running gdb on the unstripped binary
> in the build-tree instead.
>
> > This is my first time working with core and backtrace files - bear with
> > me.
>
> Thanks. This is closer, but the "postscreen" binary does not yet have
> the necessary symbol table.
>
as luck would have it - postscreen just segfaulted....attached is the
backtrace.
Vernon
ns coredumps # gdb /usr/lib/postfix/postscreen --core
core-11-207-207-21731-1286387805 --batch --quiet -ex "thread apply all bt full"
-ex "quit"
warning: Can't read pathname for load map: Input/output error.
Core was generated by `postscreen -l -n smtp -t inet -u -s 2 -v'.
Program terminated with signal 11, Segmentation fault.
#0 0x08067213 in vbuf_print (bp=0x8944318, format=0x8944cb0 "%s: notify
%s:%s", ap=0xbff68aa8
"\377\377\377\377\377\377\377\377\300R\225\b\300R\225\b\030\213\366\277I\300\004\b")
at vbuf_print.c:218
218 vbuf_print.c: No such file or directory.
in vbuf_print.c
Thread 1 (Thread 21731):
#0 0x08067213 in vbuf_print (bp=0x8944318, format=0x8944cb0 "%s: notify
%s:%s", ap=0xbff68aa8
"\377\377\377\377\377\377\377\377\300R\225\b\300R\225\b\030\213\366\277I\300\004\b")
at vbuf_print.c:218
_cp = 0xffffffff <Address 0xffffffff out of bounds>
_ch = <value optimized out>
fmt = 0x8944268
cp = 0x8944cbc "s:%s"
width = 0
prec = 0
long_flag = <value optimized out>
ch = <value optimized out>
s = <value optimized out>
#1 0x0806362a in vstring_vsprintf (vp=0x8944318, format=0x8944cb0 "%s: notify
%s:%s", ap=0xbff68aa4
"\246\203\006\b\377\377\377\377\377\377\377\377\300R\225\b\300R\225\b\030\213\366\277I\300\004\b")
at vstring.c:586
No locals.
#2 0x0805fa65 in msg_vprintf (level=0, format=0x80683bb "%s: notify %s:%s",
ap=0xbff68aa4
"\246\203\006\b\377\377\377\377\377\377\377\377\300R\225\b\300R\225\b\030\213\366\277I\300\004\b")
at msg_output.c:157
No locals.
#3 0x0805f827 in msg_info (fmt=0x80683bb "%s: notify %s:%s") at msg.c:179
No locals.
#4 0x0804c39a in ps_early_dnsbl_event (unused_event=0,
context=0x8944348
"\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377p")
at postscreen_early.c:228
No locals.
#5 0x0804c049 in ps_dnsbl_receive (event=1, context=0x89552c0 "") at
postscreen_dnsbl.c:371
_cb_ = 0x8955388
score = 0x8955370
head = 0x89542e0
site = <value optimized out>
reply_argv = <value optimized out>
#6 0x0805c31f in event_loop (delay=-1) at events.c:1180
nested = 1
event_buf = {{events = 1, data = {ptr = 0xf, fd = 15, u32 = 15, u64 =
577980792769085455}}, {events = 1, data = {ptr = 0x81, fd = 129, u32 = 129, u64
= 578210977246347393}}, {events = 1, data = {ptr = 0xe, fd = 14,
u32 = 14, u64 = 577980792769085454}}, {events = 1, data = {ptr =
0x80, fd = 128, u32 = 128, u64 = 618474156752633984}}, {events = 17, data =
{ptr = 0x10, fd = 16, u32 = 16, u64 = 4294967312}}, {events = 1, data = {
ptr = 0x81, fd = 129, u32 = 129, u64 = 578210977246347393}},
{events = 17, data = {ptr = 0x11, fd = 17, u32 = 17, u64 = 4294967313}},
{events = 2, data = {ptr = 0xb73c5ba3, fd = -1220781149, u32 = 3074186147,
u64 = 3074186147}}, {events = 0, data = {ptr = 0xb73c548c, fd =
-1220782964, u32 = 3074184332, u64 = 13203494610812032140}}, {events =
3074178165, data = {ptr = 0x0, fd = 0, u32 = 0, u64 = 0}}, {events = 256, data
= {
ptr = 0xb7705be8, fd = -1217373208, u32 = 3077594088, u64 =
7372561384}}, {events = 0, data = {ptr = 0x0, fd = 0, u32 = 0, u64 =
13218664913263656960}}, {events = 8181, data = {ptr = 0xb7724fc4, fd =
-1217245244,
u32 = 3077722052, u64 = 13218167851186278340}}, {events =
4217622598, data = {ptr = 0xbff68cb4, fd = -1074361164, u32 = 3220606132, u64 =
13218362533606755508}}, {events = 3220606116, data = {ptr = 0x306cf393,
fd = 812446611, u32 = 812446611, u64 = 9402381203}}, {events =
25388956, data = {ptr = 0x4, fd = 4, u32 = 4, u64 = 47244640260}}, {events =
3074348084, data = {ptr = 0xb73efba4, fd = -1220609116, u32 = 3074358180,
u64 = 13204026070065413028}}, {events = 1, data = {ptr =
0x89442d8, fd = 143934168, u32 = 143934168, u64 = 34503672536}}, {events =
3074178147, data = {ptr = 0x0, fd = 0, u32 = 0, u64 = 0}}, {events = 2, data = {
ptr = 0x0, fd = 0, u32 = 0, u64 = 578347174954270720}}, {events =
4294967295, data = {ptr = 0x2, fd = 2, u32 = 2, u64 = 2}}, {events = 0, data =
{ptr = 0xbff689d0, fd = -1074361904, u32 = 3220605392,
u64 = 13200271723334109648}}, {events = 3074373652, data = {ptr =
0x1, fd = 1, u32 = 1, u64 = 8589934593}}, {events = 4294967295, data = {ptr =
0xb7705da0, fd = -1217372768, u32 = 3077594528,
u64 = 7164368923002953120}}, {events = 3074311752, data = {ptr =
0xb73c5099, fd = -1220783975, u32 = 3074183321, u64 = 13204065618124099737}},
{events = 144016603, data = {ptr = 0xbff68d18, fd = -1074361064,
u32 = 3220606232, u64 = 76235050264}}, {events = 3220606140, data
= {ptr = 0xbff68cbc, fd = -1074361156, u32 = 3220606140, u64 = 16105508028}},
{events = 144002216, data = {ptr = 0x14, fd = 20, u32 = 20,
u64 = 8589934612}}, {events = 3073423238, data = {ptr =
0xb730c931, fd = -1221539535, u32 = 3073427761, u64 = 7368395057}}, {events =
3077594088, data = {ptr = 0xb730b786, fd = -1221544058, u32 = 3073423238,
u64 = 13203516828677093254}}, {events = 3074311096, data = {ptr =
0xb730f7fa, fd = -1221527558, u32 = 3073439738, u64 = 13204065377605187578}},
{events = 17, data = {ptr = 0x35340002, fd = 892600322, u32 = 892600322,
u64 = 13204043883407998978}}, {events = 144016595, data = {ptr =
0xbff68e27, fd = -1074360793, u32 = 3220606503, u64 = 13832399490926415399}},
{events = 3073572061, data = {ptr = 0xb73c3c5b, fd = -1220789157,
u32 = 3074178139, u64 = 13832399800017632347}}, {events =
3220606503, data = {ptr = 0xb73e2400, fd = -1220664320, u32 = 3074302976, u64 =
618483368236819456}}, {events = 3074311084, data = {ptr = 0xb73c548c,
fd = -1220782964, u32 = 3074184332, u64 = 13203494610812032140}},
{events = 3074178165, data = {ptr = 0x200, fd = 512, u32 = 512, u64 =
1580547965440}}, {events = 144001880, data = {ptr = 0x8954ac8, fd = 144001736,
u32 = 144001736, u64 = 618486560762186440}}, {events =
3074306036, data = {ptr = 0xb730b786, fd = -1221544058, u32 = 3073423238, u64 =
35187445512070}}, {events = 8188, data = {ptr = 0xb730cab6, fd = -1221539146,
u32 = 3073428150, u64 = 11663362742}}, {events = 3, data = {ptr =
0x1, fd = 1, u32 = 1, u64 = 34359738369}}, {events = 3077637667, data = {ptr =
0xb76b743a, fd = -1217694662, u32 = 3077272634,
u64 = 577754893451490362}}, {events = 144024776, data = {ptr =
0xab38, fd = 43832, u32 = 43832, u64 = 13216748584755571512}}, {events = 2,
data = {ptr = 0xb7716cb0, fd = -1217303376, u32 = 3077663920,
u64 = 577748919152372912}}, {events = 3077592640, data = {ptr =
0xb7724fc4, fd = -1217245244, u32 = 3077722052, u64 = 13832399336164708292}},
{events = 3074326152, data = {ptr = 0xbff68e20, fd = -1074360800,
u32 = 3220606496, u64 = 13218361258001468960}}, {events =
3074306036, data = {ptr = 0x1f88, fd = 8072, u32 = 8072, u64 =
35218731835272}}, {events = 3220606384, data = {ptr = 0xb730fa1b, fd =
-1221527013,
u32 = 3073440283, u64 = 13218160017161648667}}, {events =
3073423238, data = {ptr = 0xbff68de0, fd = -1074360864, u32 = 3220606432, u64 =
618546487222504928}}, {events = 3077710260, data = {ptr = 0x89442d8,
fd = 143934168, u32 = 143934168, u64 = 13200218131950486232}},
{events = 3220606408, data = {ptr = 0xb7710623, fd = -1217329629, u32 =
3077637667, u64 = 13198652262822512163}}, {events = 134519083, data = {
ptr = 0xb730b786, fd = -1221544058, u32 = 3073423238, u64 =
1096442095032383366}}, {events = 3073017292, data = {ptr = 0x79bac2, fd =
7977666, u32 = 7977666, u64 = 13218465884487137986}}, {events = 11, data = {
ptr = 0xb76b4d60, fd = -1217704608, u32 = 3077262688, u64 =
13216748587832790368}}, {events = 3077261712, data = {ptr = 0xb73e7e94, fd =
-1220641132, u32 = 3074326164, u64 = 13832400057715818132}}, {
events = 3077639559, data = {ptr = 0xcac0, fd = 51904, u32 = 51904,
u64 = 13204043882515450560}}, {events = 3074311040, data = {ptr = 0x8954cd0, fd
= 144002256, u32 = 144002256, u64 = 13218725575525747920}}, {
events = 0, data = {ptr = 0x0, fd = 0, u32 = 0, u64 = 4294967296}},
{events = 3220606768, data = {ptr = 0xbff68e0c, fd = -1074360820, u32 =
3220606476, u64 = 13832400092221836812}}, {events = 3077318829, data = {
ptr = 0x10000000, fd = 268435456, u32 = 268435456, u64 =
268435456}}, {events = 0, data = {ptr = 0x10, fd = 16, u32 = 16, u64 = 16}},
{events = 0, data = {ptr = 0xbff68ef4, fd = -1074360588, u32 = 3220606708,
u64 = 13218362533606756084}}, {events = 3220606692, data = {ptr =
0x8048cc4, fd = 134515908, u32 = 134515908, u64 = 13832400364013653188}},
{events = 3077724732, data = {ptr = 0x2, fd = 2, u32 = 2,
u64 = 13204130658034647042}}, {events = 1, data = {ptr = 0x0, fd
= 0, u32 = 0, u64 = 4294967296}}, {events = 3077724384, data = {ptr = 0x0, fd =
0, u32 = 0, u64 = 13200271720113504256}}, {events = 3077724384, data = {
---Type <return> to continue, or q <return> to quit---
ptr = 0x0, fd = 0, u32 = 0, u64 = 0}}, {events = 1, data = {ptr =
0xbff68ee4, fd = -1074360604, u32 = 3220606692, u64 = 13832400367099743972}},
{events = 3074322432, data = {ptr = 0xb73c5099, fd = -1220783975,
u32 = 3074183321, u64 = 13832400676190965913}}, {events =
3077724384, data = {ptr = 0x80493a4, fd = 134517668, u32 = 134517668, u64 =
738868892580}}, {events = 0, data = {ptr = 0x0, fd = 0, u32 = 0,
u64 = 94489280512}}, {events = 3074311256, data = {ptr =
0x806455c, fd = 134628700, u32 = 134628700, u64 = 1152921504741475676}},
{events = 3220606792, data = {ptr = 0x0, fd = 0, u32 = 0, u64 = 0}}, {events =
0,
data = {ptr = 0x0, fd = 0, u32 = 0, u64 = 0}}, {events = 0, data =
{ptr = 0x0, fd = 0, u32 = 0, u64 = 0}}, {events = 0, data = {ptr = 0x0, fd = 0,
u32 = 0, u64 = 0}}, {events = 0, data = {ptr = 0x0, fd = 0, u32 = 0,
u64 = 0}}, {events = 0, data = {ptr = 0x0, fd = 0, u32 = 0, u64 =
0}}, {events = 0, data = {ptr = 0x0, fd = 0, u32 = 0, u64 = 0}}, {events = 0,
data = {ptr = 0x0, fd = 0, u32 = 0, u64 = 0}}, {events = 0, data = {
ptr = 0x0, fd = 0, u32 = 0, u64 = 0}}, {events = 0, data = {ptr =
0x0, fd = 0, u32 = 0, u64 = 0}}, {events = 0, data = {ptr = 0x0, fd = 0, u32 =
0, u64 = 0}}, {events = 3077349364, data = {ptr = 0xa, fd = 10,
u32 = 10, u64 = 13832400965174558730}}, {events = 3220606792,
data = {ptr = 0xb76c2993, fd = -1217648237, u32 = 3077319059, u64 =
63206861203}}, {events = 3220606820, data = {ptr = 0x8954b14, fd = 144001812,
u32 = 144001812, u64 = 618482987349396244}}, {events =
3220606984, data = {ptr = 0x80644f4, fd = 134628596, u32 = 134628596, u64 =
60264170740}}, {events = 3220606820, data = {ptr = 0x8954b14, fd = 144001812,
u32 = 144001812, u64 = 13218725575525747476}}, {events =
134516260, data = {ptr = 0x806455c, fd = 134628700, u32 = 134628700, u64 =
134628700}}, {events = 0, data = {ptr = 0x0, fd = 0, u32 = 0, u64 = 0}}, {
events = 0, data = {ptr = 0x0, fd = 0, u32 = 0, u64 = 0}}, {events
= 0, data = {ptr = 0x0, fd = 0, u32 = 0, u64 = 0}}, {events = 0, data = {ptr =
0x0, fd = 0, u32 = 0, u64 = 0}}, {events = 0, data = {ptr = 0x0, fd = 0,
u32 = 0, u64 = 0}}, {events = 0, data = {ptr = 0x0, fd = 0, u32 =
0, u64 = 0}}, {events = 0, data = {ptr = 0x0, fd = 0, u32 = 0, u64 = 0}},
{events = 0, data = {ptr = 0x0, fd = 0, u32 = 0, u64 = 0}}, {events = 0,
data = {ptr = 0x0, fd = 0, u32 = 0, u64 = 0}}, {events = 0, data =
{ptr = 0xbff69008, fd = -1074360312, u32 = 3220606984, u64 =
618482990426001416}}, {events = 112, data = {ptr = 0xb7338a02, fd =
-1221359102,
u32 = 3073608194, u64 = 578223912466483714}}}
bp = 0xbff68b40
event_count = <value optimized out>
timer = <value optimized out>
fd = <value optimized out>
fdp = 0x895d628
select_delay = <value optimized out>
#7 0x0804f345 in event_server_main (argc=10, argv=0xbff691c4,
service=0x804b191 <ps_service>) at event_server.c:882
stream = 0x0
root_dir = 0x0
user_name = 0x8944f20 "postfix"
debug_me = 0
daemon_mode = 1
service_name = 0xbff6af86 "smtp"
delay = 0
c = <value optimized out>
fd = <value optimized out>
ap = <value optimized out>
pre_init = 0x804b00b <pre_jail_init>
post_init = 0x804abcf <post_jail_init>
loop = 0
key = <value optimized out>
transport = 0xbff6af8e "inet"
alone = 1
zerolimit = 0
watchdog = 0x8954b00
oname_val = 0x1a <Address 0x1a out of bounds>
oname = 0xb730efe8
"\211\307\351\315\376\377\377\220U\211\345\203\354\b\211\034$\350\361Y\372\377\201\303\366?\r"
oval = 0xbff69098 "8\221\366\277&\253\004\b\n"
err = <value optimized out>
generation = <value optimized out>
msg_vstream_needed = 134523855
redo_syslog_init = 134524939
#8 0x0804ab26 in main (argc=10, argv=0xbff691c4) at postscreen.c:888
str_table = {{name = 0x806776e "smtpd_service", defval = 0x806777c
"smtpd", target = 0x8073758, min = 1, max = 0}, {name = 0x80677de
"smtpd_banner", defval = 0x8067782 "$myhostname ESMTP $mail_name", target =
0x8073834,
min = 1, max = 0}, {name = 0x8067878 "smtpd_forbidden_commands",
defval = 0x806779f "CONNECT GET POST", target = 0x8073804, min = 0, max = 0},
{name = 0x80677b0 "postscreen_cache_map",
defval = 0x8067c2c "btree:$data_directory/ps_cache", target =
0x8073844, min = 0, max = 0}, {name = 0x80677c5 "postscreen_greet_banner",
defval = 0x80677dd "$smtpd_banner", target = 0x80737f4, min = 0, max = 0}, {
name = 0x8067498 "postscreen_greet_action", defval = 0x80677eb
"ignore", target = 0x8073764, min = 1, max = 0}, {name = 0x80677f2
"postscreen_dnsbl_sites", defval = 0x80680b8 "", target = 0x807378c, min = 0,
max = 0}, {
name = 0x8067480 "postscreen_dnsbl_action", defval = 0x80677eb
"ignore", target = 0x80737e8, min = 1, max = 0}, {name = 0x80674b0
"postscreen_pipelining_action", defval = 0x8067809 "enforce", target =
0x80737d0,
min = 1, max = 0}, {name = 0x80678b8
"postscreen_non_smtp_command_action", defval = 0x8069c97 "drop", target =
0x807381c, min = 1, max = 0}, {name = 0x80678dc
"postscreen_bare_newline_action",
defval = 0x80677eb "ignore", target = 0x80737c0, min = 1, max = 0},
{name = 0x8067811 "postscreen_whitelist_networks", defval = 0x806782f
"$mynetworks", target = 0x80737ac, min = 0, max = 0}, {
name = 0x806783b "postscreen_blacklist_networks", defval =
0x80680b8 "", target = 0x80737a0, min = 0, max = 0}, {name = 0x8067453
"postscreen_blacklist_action", defval = 0x80677eb "ignore", target = 0x8073828,
min = 1,
max = 0}, {name = 0x8067859 "postscreen_forbidden_commands", defval
= 0x8067877 "$smtpd_forbidden_commands", target = 0x8073784, min = 0, max = 0},
{name = 0x8067891 "postscreen_dnsbl_reply_map", defval = 0x80680b8 "",
target = 0x8073770, min = 0, max = 0}, {name = 0x0, defval = 0x0,
target = 0x0, min = 0, max = 0}}
int_table = {{name = 0x8067722 "default_process_limit", defval = 100,
target = 0x8073800, min = 1, max = 0}, {name = 0x8067753
"postscreen_dnsbl_threshold", defval = 1, target = 0x80737c4, min = 0, max =
0}, {
name = 0x8067c0c "postscreen_command_count_limit", defval = 20,
target = 0x8073774, min = 1, max = 0}, {name = 0x0, defval = 0, target = 0x0,
min = 0, max = 0}}
nint_table = {{name = 0x8067705 "postscreen_post_queue_limit", defval =
0x8067721 "$default_process_limit", target = 0x80737f0, min = 5, max = 0},
{name = 0x8067738 "postscreen_pre_queue_limit",
defval = 0x8067721 "$default_process_limit", target = 0x80737e4,
min = 10, max = 0}, {name = 0x0, defval = 0x0, target = 0x0, min = 0, max = 0}}
time_table = {{name = 0x8067529 "postscreen_greet_wait", defval =
0x8067511 "${stress?2}${stress:6}s", target = 0x80737e0, min = 1, max = 0},
{name = 0x8067674 "postscreen_greet_ttl", defval = 0x8067689 "1d",
target = 0x8073788, min = 1, max = 0}, {name = 0x806768c
"postscreen_dnsbl_ttl", defval = 0x80676a1 "1h", target = 0x8073798, min = 1,
max = 0}, {name = 0x80676a4 "postscreen_pipelining_ttl", defval = 0x80676be
"30d",
target = 0x807375c, min = 1, max = 0}, {name = 0x8067ba8
"postscreen_non_smtp_command_ttl", defval = 0x80676be "30d", target =
0x8073824, min = 1, max = 0}, {name = 0x80676c2 "postscreen_bare_newline_ttl",
defval = 0x80676be "30d", target = 0x8073820, min = 1, max = 0},
{name = 0x8067bc8 "postscreen_cache_retention_time", defval = 0x80676de "7d",
target = 0x80737d4, min = 1, max = 0}, {
name = 0x8067be8 "postscreen_cache_cleanup_interval", defval =
0x80676e1 "12h", target = 0x80737bc, min = 1, max = 0}, {name = 0x80676e5
"postscreen_watchdog_timeout", defval = 0x8067701 "10s", target = 0x80737dc,
---Type <return> to continue, or q <return> to quit---
min = 10, max = 0}, {name = 0x0, defval = 0x0, target = 0x0, min =
0, max = 0}}
bool_table = {{name = 0x806762d "smtpd_helo_required", defval = 0,
target = 0x807383c}, {name = 0x8067642 "disable_vrfy_command", defval = 0,
target = 0x8073760}, {name = 0x8067657 "postscreen_pipelining_enable",
defval = 0, target = 0x8073818}, {name = 0x8067b64
"postscreen_non_smtp_command_enable", defval = 0, target = 0x8073778}, {name =
0x8067b88 "postscreen_bare_newline_enable", defval = 0, target = 0x80737d8}, {
name = 0x0, defval = 0, target = 0x0}}
raw_table = {{name = 0x80674f3 "postscreen_command_time_limit", defval
= 0x80674d8 "${stress?10}${stress:300}s", target = 0x8073810, min = 1, max =
0}, {name = 0x0, defval = 0x0, target = 0x0, min = 0, max = 0}}
nbool_table = {{name = 0x8067613 "postscreen_helo_required", defval =
0x806762c "$smtpd_helo_required", target = 0x8073840}, {name = 0x8067b44
"postscreen_disable_vrfy_command", defval = 0x8067641 "$disable_vrfy_command",
target = 0x807382c}, {name = 0x0, defval = 0x0, target = 0x0}}
