Hi,
quite a few people have reported that e.g. ping gets 'Killed'
immediately when they execute it. We were now able to track that down
to the presence of the libnss-db package:
[EMAIL PROTECTED]:~# LD_PRELOAD=/home/mbanck/libnss_db.so.2 ping
Killed
[EMAIL PROTECTED]:~# ping
Usage: ping [OPTION]... [ADDRESS]...
Running rpctrace on it suggests it tries to find /var/db/protocols.db
twice and then gets killed for whatever reason:
83->io_read_request (-1 8192) = 0 ""
task17741-> 3206 (pn{ 23}) = 0
69->dir_lookup ("var/db/protocols.db" 3 0) = 0x40000002 (No such file
or directory)
69->dir_lookup ("var/db/protocols.db" 1 0) = 0x40000002 (No such file
or directory)
task17741-> 3208 (pn{ 5} 1 -1) = 0
task17741-> 3208 (pn{ 23} 1 -1) = 0
task17741-> 2008 () = 0
Child 17741 Killed
(I can make the whole rpctrace available if needed)
If I remove the 'db' for protocols: in /etc/nsswitch.conf, ping works
fine as well.
Running /bin/ping through gdb, breaking on db_open and stepping through
the code suggests it tries to open the database, fails, sets errno:
57 err = db_open (file, DB_BTREE, DB_RDONLY, 0, NULL, NULL, &db);
(gdb) n
58 if (err != 0)
(gdb) n
60 if (err > 0)
(gdb) n
78 __set_errno (err);
(gdb) n
79 return NSS_STATUS_UNAVAIL;
and then eventually ends here:
0x01023a7f in _nss_db_getprotobyname_r (name=0x804c9ee "icmp",
result=0xffffffff, buffer=0xffffffff <Address 0xffffffff out of
bounds>,
buflen=4294967295, errnop=0xffffffff) at files-proto.c:39
39 DB_LOOKUP (protobyname, 1 + strlen (name), (".%s", name),
DB_LOOKUP got called twice already by that time. If I press 'n' here, I
get:
(gdb) n
Program terminated with signal SIGKILL, Killed.
The program no longer exists.
If I instead step further, I reach this:
39 DB_LOOKUP (protobyname, 1 + strlen (name), (".%s", name),
(gdb) s
_hurd_intr_rpc_mach_msg (msg=0x0, option=16884752, send_size=40,
rcv_size=4294967295, rcv_name=4294967295, timeout=16884864,
notify=40)
at intr-msg.c:40
40 {
(gdb) bt full
#0 _hurd_intr_rpc_mach_msg (msg=0x1019ba8, option=3, send_size=40,
rcv_size=40, rcv_name=31, timeout=0, notify=40) at intr-msg.c:43
err = 148
user_option = 0
user_timeout = 0
m = (union msg * const) 0x3
msgh_bits = 0
remote_port = 0
msgid = 0
save_data = {type = {msgt_name = 0, msgt_size = 0, msgt_number = 0,
msgt_inline = 0, msgt_longform = 0, msgt_deallocate = 0,
msgt_unused = 0}, err = 0}
#1 0x0001268a in io_write () from /lib/ld.so
#2 0x0000ece6 in __writev () from /lib/ld.so
#3 0x0000c905 in _dl_debug_vdprintf () from /lib/ld.so
#4 0x0000cc65 in _dl_dprintf () from /lib/ld.so
#5 0x0000be31 in _dl_signal_error_internal () from /lib/ld.so
#6 0x0000bf45 in _dl_signal_cerror () from /lib/ld.so
#7 0x000086a5 in _dl_lookup_symbol_internal () from /lib/ld.so
#8 0x0000ba53 in fixup () from /lib/ld.so
#9 0x0000bc80 in _dl_runtime_resolve () from /lib/ld.so
#10 0x01023a89 in _nss_db_getprotobyname_r (
name=0xffffffff <Address 0xffffffff out of bounds>, result=0x28,
buffer=0x28 <Address 0x28 out of bounds>, buflen=40, errnop=0x28)
at files-proto.c:39
key = {data = 0x101acd8, size = 5, ulen = 1882, dlen = 17253534,
doff = 17226740, flags = 0}
status = NSS_STATUS_UNAVAIL
size = 0
[...]
and then:
44 const mach_msg_timeout_t user_timeout = timeout;
(gdb) s
40 {
(gdb) s
at which point gdb hangs and I need to kill -9 the ping process.
Any idea what is wrong or how to debug this further?
thanks,
Michael
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