Jilles Tjoelker <jilles_at_stack.nl> writes: > On Thu, Mar 07, 2013 at 04:54:01AM -0100, Jan Beich wrote: > >> Jilles Tjoelker <jilles_at_stack.nl> writes: > >> > On Tue, Mar 05, 2013 at 08:59:09PM +0100, Hartmann, O. wrote: > >> >> A "truss top" reveals this, is this of help? > >> >> [...] >> >> stat("/etc/nsswitch.conf",{ mode=-rw-r--r-- >> >> ,inode=162310,size=1007,blksize=32768 }) = 0 (0x0) >> >> stat("/etc/nsswitch.conf",{ mode=-rw-r--r-- >> >> ,inode=162310,size=1007,blksize=32768 }) = 0 (0x0) >> >> stat("/etc/nsswitch.conf",{ mode=-rw-r--r-- >> >> ,inode=162310,size=1007,blksize=32768 }) = 0 (0x0) >> >> stat("/etc/nsswitch.conf",{ mode=-rw-r--r-- >> >> ,inode=162310,size=1007,blksize=32768 }) = 0 (0x0) >> >> stat("/etc/nsswitch.conf",{ mode=-rw-r--r-- >> >> ,inode=162310,size=1007,blksize=32768 }) = 0 (0x0) >> >> socket(PF_LOCAL,SOCK_STREAM,0) = 4 (0x4) >> >> connect(4,{ AF_UNIX "/var/run/nscd" },15) = 0 (0x0) >> >> fcntl(4,F_SETFL,O_NONBLOCK) = 0 (0x0) >> >> kqueue(0x80183b000,0x80122fc58,0x10,0x80062b308,0x80183b010,0x2) >> >> = 5 (0x5) >> >> kevent(5,{0x4,EVFILT_WRITE,EV_ADD,0,0x0,0x0},1,0x0,0,0x0) = 0 (0x0) >> >> kqueue(0x5,0x7fffffffd2e0,0x1,0x0,0x0,0x0) = 6 (0x6) >> >> kevent(6,{0x4,EVFILT_READ,EV_ADD,0,0x0,0x0},1,0x0,0,0x0) = 0 (0x0) >> >> kevent(5,{0x4,EVFILT_WRITE,EV_ADD,1,0x4,0x0},1,0x0,0,0x0) = 0 (0x0) >> >> kevent(5,0x0,0,{0x4,EVFILT_WRITE,EV_EOF,0,0x2000,0x0},1,0x0) = 1 (0x1) >> >> sendmsg(0x4,0x7fffffffd290,0x0,0x1,0x1,0x0) ERR#32 'Broken pipe' >> >> SIGNAL 13 (SIGPIPE) >> >> process exit, rval = 0 > >> > Apparently there is a bug that causes nscd to close the connection >> > immediately but even then it is wrong that this terminates the calling >> > program with SIGPIPE. > >> > The below patch prevents the SIGPIPE but cannot revive the connection to >> > nscd. This may cause numeric UIDs in top or increase the load on the >> > directory server. It is compile tested only. >> [...] > >> The patch seems to fix the issue in a world after r247804. I don't see >> numeric UIDs in top but without the patch top crashes with SIGPIPE a lot >> less frequently than sudo or make install (in base/ports) for me. > >> In my case shutting down nscd helped, too. Compared to stock >> nsswitch.conf I only have "cache" added. > > Can you find what causes nscd to close the connection quickly, such as > using ktrace? # single user mode $ ktrace -p $(pgrep nscd); top -b; ktrace -c; kdump 71 nscd GIO fd 5 wrote 0 bytes "" 71 nscd GIO fd 5 read 32 bytes 0x0000 0400 0000 0000 0000 ffff 1000 0000 0000 0100 |..................| 0x0012 0000 0000 0000 0000 0000 0000 0000 |..............| 71 nscd RET kevent 1 71 nscd CALL accept(0x4,0,0) 71 nscd RET accept 6 71 nscd CALL getsockopt(0x6,0,0x1,0x7fffff9fce28,0x7fffff9fce24) 71 nscd RET getsockopt 0 71 nscd CALL kevent(0x5,0x7fffff9fcf00,0x2,0,0,0x7fffff9fcf50) 71 nscd GIO fd 5 wrote 64 bytes 0x0000 0600 0000 0000 0000 f9ff 1100 0000 0000 401f |................_at_.| 0x0012 0000 401f 0000 40e6 4002 0800 0000 0600 0000 |.._at_..._at_._at_.........| 0x0024 0000 0000 ffff 1100 0100 0000 0400 0000 0000 |..................| 0x0036 0000 40e6 4002 0800 0000 |.._at_._at_.....| 71 nscd GIO fd 5 read 0 bytes "" 71 nscd RET kevent 0 71 nscd CALL kevent(0x5,0x7fffff9fcec0,0x1,0,0,0x7fffff9fcee0) 71 nscd GIO fd 5 wrote 32 bytes 0x0000 0400 0000 0000 0000 ffff 1100 0000 0000 0000 |..................| 0x0012 0000 0000 0000 0000 0000 0000 0000 |..............| 71 nscd GIO fd 5 read 0 bytes "" 71 nscd RET kevent 0 71 nscd CALL kevent(0x5,0,0,0x7fffff9fcec0,0x1,0) 71 nscd GIO fd 5 wrote 0 bytes "" 71 nscd GIO fd 5 read 32 bytes 0x0000 0600 0000 0000 0000 f9ff 3000 0000 0000 0100 |..........0.......| 0x0012 0000 0000 0000 40e6 4002 0800 0000 |......_at_._at_.....| 71 nscd RET kevent 1 71 nscd CALL close(0x6) 71 nscd RET close 0 71 nscd CALL kevent(0x5,0,0,0x7fffff9fcec0,0x1,0)Received on Sun Mar 10 2013 - 21:29:09 UTC
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