Hi,
I am happy to be able to present some more info on the problems involving
sudo/pflocal/syslogd.
There seem to be a couple of issues. First, it seems that sudo and
pflocal/libpipe seem to work fine in the normal case. What happens
is that sudo sends a diagnostic line to syslogd. syslogd receives only
one line, logs it, and on receiving the second line (?) then goes into
foobar mode.
After enough sudos, the pipe buffer will be full (16kb), and the subsequent
sends will hang in pflocal, because the writing thread will wait for the
buffer to empty a bit. There seems to be a bug here, because if you now
kill syslogd, the writing thread will not wake up rather than getting a
broken pipe or whatever. I also had pflocal crashing when restarting
syslogd in this situation, but that does not seem to be reproducible.
So at least two bugs involved here? It seems so. Below you can see
the gdb output of syslogd at the time of sudo hanging. I should be able
to narrow it further than that by debugging syslogd in more detail.
Thanks,
Marcus
Script started on Sun Oct 28 02:54:34 2001
ulysses:/mnt/inetutils/inetutils-20010817/syslogd# gdb / /. ./syslogd 6968
GNU gdb 5.0.90-cvs (MI_OUT)
Copyright 2001 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i386-unknown-gnu0.2"...
/mnt/inetutils/inetutils-20010817/syslogd/6968: No such file or directory.
Attaching to program `/mnt/inetutils/inetutils-20010817/syslogd/./syslogd', pid 6968
Reading symbols from /lib/libz.so.1...done.
Loaded symbols for /lib/libz.so.1
Reading symbols from /lib/libreadline.so.4...done.
Loaded symbols for /lib/libreadline.so.4
Reading symbols from /lib/libresolv.so.2...done.
Loaded symbols for /lib/libresolv.so.2
Reading symbols from /lib/libnsl.so.1...done.
Loaded symbols for /lib/libnsl.so.1
Reading symbols from /lib/libc.so.0.2...done.
Loaded symbols for /lib/libc.so.0.2
Reading symbols from /lib/libncurses.so.5...done.
Loaded symbols for /lib/libncurses.so.5
Reading symbols from /lib/ld.so...done.
Loaded symbols for /lib/ld.so
Reading symbols from /lib/libmachuser.so.1...done.
Loaded symbols for /lib/libmachuser.so.1
Reading symbols from /lib/libhurduser.so.0.0...done.
Loaded symbols for /lib/libhurduser.so.0.0
Reading symbols from /lib/libnss_files.so.2...done.
Loaded symbols for /lib/libnss_files.so.2
Reading symbols from /lib/libnss_dns.so.2...done.
Loaded symbols for /lib/libnss_dns.so.2
[Switching to thread 6968.1]
(gdb) bt
#0 0x010ba831 in _hurd_intr_rpc_msg_in_trap () at intr-msg.c:118
#1 0x01252fcb in __socket_recv (sock=98, addr=0x1025698, flags=0,
data=0x102569c, dataCnt=0x10256a0, ports=0x10256a4, portsCnt=0x10256a8,
control=0x10256ac, controlCnt=0x10256b0, outflags=0x1025720, amount=1024)
at /cdrecord/marcus/glibc-2.2.4/i386-gnu/obj/hurd/RPC_socket_recv.c:166
#2 0x01191047 in recvfrom (fd=4, buf=0x10257d8, n=1024, flags=0, addrarg=
{__sockaddr__ = 0x10257c8, __sockaddr_at__ = 0x10257c8, __sockaddr_ax25__ =
0x10257c8, __sockaddr_dl__ = 0x10257c8, __sockaddr_eon__ = 0x10257c8, __sockaddr_in__
= 0x10257c8, __sockaddr_in6__ = 0x10257c8, __sockaddr_inarp__ = 0x10257c8,
__sockaddr_ipx__ = 0x10257c8, __sockaddr_iso__ = 0x10257c8, __sockaddr_ns__ =
0x10257c8, __sockaddr_un__ = 0x10257c8, __sockaddr_x25__ = 0x10257c8},
addr_len=0x1025754) at ../sysdeps/mach/hurd/recvfrom.c:49
#3 0x0804a1b8 in main (argc=1, argv=0x1025c40) at syslogd.c:663
#4 0x010c701b in __libc_start_main (main=0x804991c <main>, argc=1,
ubp_av=0x1025c40, init=0x8049280 <_init>, fini=0x804d150 <_fini>,
rtld_fini=0xc640 <_dl_fini>, stack_end=0x1025c3c)
at ../sysdeps/generic/libc-start.c:129
(gdb) bt full
#0 0x010ba831 in _hurd_intr_rpc_msg_in_trap () at intr-msg.c:118
err = 0
ss = (struct hurd_sigstate *) 0x125a808
user_option = 3
user_timeout = 0
m = (union msg *) 0x1023da8
msgh_bits = 5395
remote_port = 98
msgid = 26015
save_data = {i = {268509186, 0}}
#1 0x01252fcb in __socket_recv (sock=98, addr=0x1025698, flags=0,
data=0x102569c, dataCnt=0x10256a0, ports=0x10256a4, portsCnt=0x10256a8,
control=0x10256ac, controlCnt=0x10256b0, outflags=0x1025720, amount=1024)
at /cdrecord/marcus/glibc-2.2.4/i386-gnu/obj/hurd/RPC_socket_recv.c:166
sock = 98
addr = (mach_port_t *) 0x10004005
flags = 16923908
outflags = (int *) 0x10004005
amount = 3
Mess = {In = {Head = {msgh_bits = 5395, msgh_size = 32,
msgh_remote_port = 98, msgh_local_port = 84, msgh_seqno = 146,
msgh_id = 26015}, flagsType = {msgt_name = 2, msgt_size = 32,
msgt_number = 1, msgt_inline = 1, msgt_longform = 0,
msgt_deallocate = 0, msgt_unused = 0}, flags = 0, amountType = {
---Type <return> to continue, or q <return> to quit---
msgt_name = 2, msgt_size = 32, msgt_number = 1, msgt_inline = 1,
msgt_longform = 0, msgt_deallocate = 0, msgt_unused = 0},
amount = 1024}, Out = {Head = {msgh_bits = 5395, msgh_size = 32,
msgh_remote_port = 98, msgh_local_port = 84, msgh_seqno = 146,
msgh_id = 26015}, RetCodeType = {msgt_name = 2, msgt_size = 32,
msgt_number = 1, msgt_inline = 1, msgt_longform = 0,
msgt_deallocate = 0, msgt_unused = 0}, RetCode = 0, addrType = {
msgt_name = 2, msgt_size = 32, msgt_number = 1, msgt_inline = 1,
msgt_longform = 0, msgt_deallocate = 0, msgt_unused = 0}, addr = 1024,
dataType = {msgtl_header = {msgt_name = 0, msgt_size = 0, msgt_number = 0,
msgt_inline = 1, msgt_longform = 1, msgt_deallocate = 0,
msgt_unused = 0}, msgtl_name = 8, msgtl_size = 8, msgtl_number = 136},
data = "<78>Oct 28 02:53:01 /USR/SBIN/CRON[6973]: (mail) CMD ( if [ -x
/usr/sbin/exim -a -f /etc/exim/exim.conf ]; then /usr/sbin/exim -q ;
fi)\000\000\0000\021\000
\000\000\000\000\000\000\000\0000\b\000\b\000\000\000\000\000\002
\001\020\000\000\000\000¬\030\036\001\220j\036\001\214?\002\001t\025\031\001\003",
'\000' <repeats 11 times>, "d\025\031\001\003"..., portsType = {msgtl_header = {
msgt_name = 0, msgt_size = 0, msgt_number = 0, msgt_inline = 0,
msgt_longform = 0, msgt_deallocate = 0, msgt_unused = 0},
msgtl_name = 0, msgtl_size = 0, msgtl_number = 0}, ports = {
0 <repeats 93 times>, 268509186, 1, 268509201, 96, 16926636, 17476819,
85, 16928149, 0, 0, 16926808, 16926812, 16927896, 17540862, 19230164,
274, 16926760, 0, 18749612, 16927836, 16926732, 17458148, 85, 16928149,
1, 335546380, 796288356, 85, 5395, 0, 3, 19245064, 0, 19238856, 0, 0,
---Type <return> to continue, or q <return> to quit---
16927836, 19181628, 16926760, 3, 0, 17479169, 18749612, 274, 134537460,
19181585, 18749612, 16928052, 19245064, 0, 1, 0, 0, 0, 84, 127, 20118,
38595769, 1807149313, 268501000, 1, 335546380, 0 <repeats 149 times>,
17876302, 18749612, 16929216, 16929216, 0, 0, 0, 16927476, 17876417,
16929216, 0, 0, 17876398, 18749612, 16929216, 16929216, 0, 0, 0,
16927524, 17876684, 16929216, 0, 0, 17876665, 18749612, 16927548, 0, 0,
0, 0, 16927604, 17865881, 16929216, 0, 0, 17865566, 18749612, 134536341,
134536341, 0, 0, 0, 0, 1073741827, 1, 10, 0, 0, 0, 134536341, 16929156,
17820700, 16929216, 1, 0, 16929216, 18749612, 20, 16929300,
0 <repeats 47 times>, 268509201, 1929379936, 16927776, 0, 4294967295,
4294967292, 0, 0, 0, 0, 0, 0, 0, 0, 0, 134533567, 19230164, 65554,
16928040, 17458148, 134536336, 1073741827, 2, 16929368, 16929156, 9,
4294967295, 0, 796029813, 85, 5395, 0, 3, 19245064, 0, 19242900,
16927988, 19242904, 16929116, 19181628, 16928040, 3, 16929116, 19181666,
84, 0, 0, 19181585...}, controlType = {msgtl_header = {msgt_name = 0,
msgt_size = 18, msgt_number = 0, msgt_inline = 0, msgt_longform = 0,
msgt_deallocate = 0, msgt_unused = 0}, msgtl_name = 56,
msgtl_size = 0, msgtl_number = 0},
control = "T\000\000\000\210\000\000\000þe\000\000\002
\001\020\000\000\000\000\002
\001\020\001\000\000\000\000\000\0000\b\000\b\000\003\000\000\000\003\001", '\000'
<repeats 734 times>,
"ÜQ\002\001\210\230\000\000þ\212\004\b\f\235\003\001\000\000\000\000\205\224\000\000\024C\002\000ô\000\000\000`H\002",
'\000' <repeats 25 times>,
"þ\212\004\b\000\000\000\000\000\000\000\000$R\002\001\210\230\000\000þ\212\004\b²²\t\0014R\002\001\217\227\000\0007²\t\001¬\216\004\b`H\002\0---Type
<return> to continue, or q <return> to quit---
00\205\224\000\000\024C\002\000È\002\000\000`H\002\000\006\002y\005ëZ\001\000þ\212\004\b\024R\002\001T§\036\001\000\000\000\000yO\n\001\020R\002\001\003\000\000\000\030\000\000"...,
outflagsType = {msgt_name = 172, msgt_size = 24,
msgt_number = 286, msgt_inline = 0, msgt_longform = 0,
msgt_deallocate = 0, msgt_unused = 0}, outflags = 18770576}}
OutP = (Reply *) 0x1023da8
msg_result = 98
msgh_simple = 268451845
msgh_size = 84
msgh_size_delta = 98
flagsType = {msgt_name = 2, msgt_size = 32, msgt_number = 1,
msgt_inline = 1, msgt_longform = 0, msgt_deallocate = 0, msgt_unused = 0}
amountType = {msgt_name = 2, msgt_size = 32, msgt_number = 1,
msgt_inline = 1, msgt_longform = 0, msgt_deallocate = 0, msgt_unused = 0}
RetCodeCheck = {msgt_name = 2, msgt_size = 32, msgt_number = 1,
msgt_inline = 1, msgt_longform = 0, msgt_deallocate = 0, msgt_unused = 0}
addrCheck = {msgt_name = 17, msgt_size = 32, msgt_number = 1,
msgt_inline = 1, msgt_longform = 0, msgt_deallocate = 0, msgt_unused = 0}
outflagsCheck = {msgt_name = 2, msgt_size = 32, msgt_number = 1,
msgt_inline = 1, msgt_longform = 0, msgt_deallocate = 0, msgt_unused = 0}
#2 0x01191047 in recvfrom (fd=4, buf=0x10257d8, n=1024, flags=0, addrarg=
{__sockaddr__ = 0x10257c8, __sockaddr_at__ = 0x10257c8, __sockaddr_ax25__ =
0x10257c8, __sockaddr_dl__ = 0x10257c8, __sockaddr_eon__ = 0x10257c8, __sockaddr_in__
= 0x10257c8, __sockaddr_in6__ = 0x10257c8, __sockaddr_inarp__ = 0x10257c---Type
<return> to continue, or q <return> to quit---
8, __sockaddr_ipx__ = 0x10257c8, __sockaddr_iso__ = 0x10257c8, __sockaddr_ns__ =
0x10257c8, __sockaddr_un__ = 0x10257c8, __sockaddr_x25__ = 0x10257c8},
addr_len=0x1025754) at ../sysdeps/mach/hurd/recvfrom.c:49
port = (struct hurd_port *) 0x1258e48
__result = 0
__d = (struct hurd_fd *) 0x1258e48
__ulink = {resource = {next = 0x0, prevp = 0x1258e4c}, thread = {
next = 0x0, prevp = 0x125ac5c}, cleanup = 0x10c58c0 <_hurd_port_cleanup>,
cleanup_data = 0x62}
__ctty_ulink = {resource = {next = 0x102571c, prevp = 0x117d17a},
thread = {next = 0x804f778, prevp = 0x9},
cleanup = 0x8048bfa <object.11+115174314>, cleanup_data = 0x108b764}
crit = (void *) 0x125a808
err = 1024
addrport = 99
bufp = 0x10257d8 ""
nread = 1024
ports = (mach_port_t *) 0x10256f4
nports = 0
cdata = 0x0
clen = 0
#3 0x0804a1b8 in main (argc=1, argv=0x1025c40) at syslogd.c:663
frominet = {sin_len = 43 '+', sin_family = 181 'µ', sin_port = 0,
sin_addr = {s_addr = 1}, sin_zero = " F\002\000¼W\002\001"}
---Type <return> to continue, or q <return> to quit---
result = 268451845
len = 16
nready = 268451845
argc = 16930776
argv = (char **) 0x8050030
option = 268451845
i = 1
fp = (FILE *) 0x10257d8
p = 0x10004005 <Address 0x10004005 out of bounds>
line = '\000' <repeats 1024 times>
ppid = 16930760
fdarray = (struct pollfd *) 0x8050028
nfds = 2
#4 0x010c701b in __libc_start_main (main=0x804991c <main>, argc=1,
ubp_av=0x1025c40, init=0x8049280 <_init>, fini=0x804d150 <_fini>,
rtld_fini=0xc640 <_dl_fini>, stack_end=0x1025c3c)
at ../sysdeps/generic/libc-start.c:129
ubp_av = (char **) 0x1025c40
fini = (void (*)()) 0x247b0 <_dl_debug_mask>
rtld_fini = (void (*)()) 0x1023d04
ubp_ev = (char **) 0x10004005
(gdb) thr 2
[Switching to thread 2 (thread 6968.2)]#0 0x010a48cc in __mach_msg_trap ()
from /lib/libc.so.0.2
(gdb) bt
#0 0x010a48cc in __mach_msg_trap () from /lib/libc.so.0.2
#1 0x010a4f79 in __mach_msg (msg=0x1262f74, option=3, send_size=32,
rcv_size=4096, rcv_name=64, timeout=0, notify=0) at msg.c:47
#2 0x010a553d in __mach_msg_server_timeout (demux=0x10b0e40 <msgport_server>,
max_size=4096, rcv_name=64, option=0, timeout=0) at msgserver.c:169
#3 0x010a55a4 in __mach_msg_server (demux=0x10b0e40 <msgport_server>,
max_size=4096, rcv_name=64) at msgserver.c:209
#4 0x010b0f4b in _hurd_msgport_receive () at msgportdemux.c:68
#5 0x464c457f in ?? ()
(gdb) bt full
#0 0x010a48cc in __mach_msg_trap () from /lib/libc.so.0.2
No locals.
#1 0x010a4f79 in __mach_msg (msg=0x1262f74, option=3, send_size=32,
rcv_size=4096, rcv_name=64, timeout=0, notify=0) at msg.c:47
option = 3
ret = 268451845
#2 0x010a553d in __mach_msg_server_timeout (demux=0x10b0e40 <msgport_server>,
max_size=4096, rcv_name=64, option=0, timeout=0) at msgserver.c:169
request = (mig_reply_header_t *) 0x1262f74
reply = (mig_reply_header_t *) 0x1261f74
mr = 268451845
#3 0x010a55a4 in __mach_msg_server (demux=0x10b0e40 <msgport_server>,
max_size=4096, rcv_name=64) at msgserver.c:209
No locals.
#4 0x010b0f4b in _hurd_msgport_receive () at msgportdemux.c:68
No locals.
#5 0x464c457f in ?? ()
No symbol table info available.
(gdb)
#0 0x010a48cc in __mach_msg_trap () from /lib/libc.so.0.2
No locals.
#1 0x010a4f79 in __mach_msg (msg=0x1262f74, option=3, send_size=32,
rcv_size=4096, rcv_name=64, timeout=0, notify=0) at msg.c:47
option = 3
ret = 268451845
#2 0x010a553d in __mach_msg_server_timeout (demux=0x10b0e40 <msgport_server>,
max_size=4096, rcv_name=64, option=0, timeout=0) at msgserver.c:169
request = (mig_reply_header_t *) 0x1262f74
reply = (mig_reply_header_t *) 0x1261f74
mr = 268451845
#3 0x010a55a4 in __mach_msg_server (demux=0x10b0e40 <msgport_server>,
max_size=4096, rcv_name=64) at msgserver.c:209
No locals.
#4 0x010b0f4b in _hurd_msgport_receive () at msgportdemux.c:68
No locals.
#5 0x464c457f in ?? ()
No symbol table info available.
(gdb) quit
The program is running. Quit anyway (and detach it)? (y or n) y
Detaching from program `/mnt/inetutils/inetutils-20010817/syslogd/./syslogd' pid 6968
ulysses:/mnt/inetutils/inetutils-20010817/syslogd# l exit
Script done on Sun Oct 28 02:55:13 2001
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