Hi all,
yesterday my netfilter client suddenly froze. I wasn't even able to kill it.
The following is a strace:
recvmsg(4, 0x7fffffffa770, 0) = ? ERESTARTSYS (To be restarted)
--- SIGABRT (Aborted) @ 0 (0) ---
stat("/etc/localtime", {st_mode=S_IFREG|0644, st_size=2652, ...}) = 0
sendto(6, "<26>May 4 21:24:37 ibd-judge[403"..., 55, MSG_NOSIGNAL, NULL, 0)
= 55
rt_sigreturn(0x7fbc6c21c9e0) = -1 EINTR (Interrupted system call)
recvmsg(4, 0x7fffffffa770, 0) = ? ERESTARTSYS (To be restarted)
--- SIGTERM (Terminated) @ 0 (0) ---
rt_sigreturn(0xf) = -1 EINTR (Interrupted system call)
recvmsg(4, 0x7fffffffa770, 0) = ? ERESTARTSYS (To be restarted)
--- SIGTERM (Terminated) @ 0 (0) ---
rt_sigreturn(0xf) = -1 EINTR (Interrupted system call)
recvmsg(4, 0x7fffffffa770, 0) = ? ERESTARTSYS (To be restarted)
+++ killed by SIGKILL +++
(The log line on ABRT is written by the signal handler. I didn't put any
SA_RESTART for the sigaction of those signals, but it didn't get out of the
call.)
The relevan line of code is
while (caught_signal == 0 &&
(rv = recv(fd, buf, sizeof(buf), 0)) >= 0)
Under normal circumstances, it does
recvfrom(4,
"d\0\0\0\0\3\0\0\0\0\0\0\0\0\0\0\2\0\0\0\v\0\1\0\0\0\f\241\10\0\1\0\10"...,
8192, 0, NULL, NULL) = 100
pread(3,
"\0\0\0\0\1\0\0\0\23\3\0\0\213\t\0\0\230\4\0\0`\0\300\1\1\5\370\17\264\17P\2
\f"..., 4096, 3223552) = 4096
sendmsg(4, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000},
msg_iov(1)=[{"
\0\0\0\1\3\1\0ZW\341K\0\0\0\0\0\0\0\0\f\0\2\0\0\0\0\1\0\0\f\241"..., 32}],
msg_controllen=0, msg_flags=0}, 0) = 32
recvfrom(4,
"@\0\0\0\0\3\0\0\0\0\0\0\0\0\0\0\2\0\0\2\v\0\1\0\0\0\325\274\0\0\3\0\10"...,
8192, 0, NULL, NULL) = 64
sendmsg(4, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000},
msg_iov(1)=[{"
\0\0\0\1\3\1\0[W\341K\0\0\0\0\0\0\0\2\f\0\2\0\0\0\0\1\0\0\325\274"..., 32}],
msg_controllen=0, msg_flags=0}, 0) = 32
recvfrom(4,
"@\0\0\0\0\3\0\0\0\0\0\0\0\0\0\0\2\0\0\2\v\0\1\0\0\0\325\275\0\0\3\0\10"...,
8192, 0, NULL, NULL) = 64
sendmsg(4, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000},
msg_iov(1)=[{"
\0\0\0\1\3\1\0\\W\341K\0\0\0\0\0\0\0\2\f\0\2\0\0\0\0\1\0\0\325\275"...,
32}], msg_controllen=0, msg_flags=0}, 0) = 32
Note that recvfrom rather than recvmsg. This is a debian lenny, with NETLINK
v0.30. Both queues are configured with
nfq_set_mode(qh, NFQNL_COPY_PACKET, 20)
It is the first time I see that freezing. Is it a known issue? What should I
have looked for to diagnose it? Any hint?
TIA
Ale
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