https://bugzilla.novell.com/show_bug.cgi?id=416404

Summary: Resolver blocks and cannot be aborted (ping) Product: openSUSE 11.0 Version: Final Platform: Other OS/Version: Other Status: NEW Severity: Normal Priority: P5 - None Component: Basesystem AssignedTo: bnc-team-screening@forge.provo.novell.com ReportedBy: lmb@novell.com QAContact: qa@suse.de Found By: Development

Created an attachment (id=232808) --> (https://bugzilla.novell.com/attachment.cgi?id=232808) strace -ro from ping

If I call "ping dale.suse.de" on my 11.0 system, tries to lookup the address, which can take a while. That is annoying, but more annoying is that I cannot abort the lookup:

ping dale.suse.de PING dale.suse.de (10.10.2.87) 56(84) bytes of data. ^C^C^C^C^C^C^C^C64 bytes from 10.10.2.87: icmp_seq=1 ttl=62 time=38.0 ms

--- dale.suse.de ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 38.037/38.037/38.037/0.000 ms

As you can see, the system did not respond to the SIGINT immediately; in fact, this takes >5 seconds!

A direct strace to the console can be aborted immediately:

connect(4, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("192.168.1.1")}, 28) = 0 fcntl64(4, F_GETFL) = 0x2 (flags O_RDWR) fcntl64(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0 gettimeofday({1218486639, 30936}, NULL) = 0 poll([{fd=4, events=POLLOUT, revents=POLLOUT}], 1, 0) = 1 send(4, "\370\210\1\0\0\1\0\0\0\0\0\0\00287\0012\00210\00210\7in-addr\4"..., 41, MSG_NOSIGNAL) = 41 poll(^C <unfinished ...>

If I instruct syslog to log to a file (attached), it exhibits the same behaviour of being uninterruptible.

It seems that ping blocks SIGINT to terminate cleanly and with printing the summary stats, but it does so before the possibly time-consuming lookup has completed. (This is also obvious from the fact that it is impossible to abort before the first ping packet has been sent.)

I suggest to move the signal trickery to a later point in the code.