Re: 2.6.12-mm1: BUG() in fd_install, RCU related?

[Rafael J. Wysocki]

Hi,

On Thursday, 23 of June 2005 21:02, Dipankar Sarma wrote:
> On Thu, Jun 23, 2005 at 01:50:11PM +0200, syrius.ml@xxxxxxxxxx wrote:
> > Dipankar Sarma <dipankar@xxxxxxxxxx> writes:
> > 
> > > Some things are common - always with fcntl() or fcntl64() and with
> > > a daemon. Does your box come up at all ? If so, can you get me an
> > > strace on the process that triggers this ? If I can narrow it
> > > down to a small testcase, it would be a lot easier. Also, does
> > > switching off CONFIG_PREEMPT fix this problem ?
> > 
> > I haven't read about this thread. I hope u'll find a way to reproduce
> > it. here debian/sid i386 (.config sent in an earlier message), it 100%
> > reproducible when restarting bind9. (it also happens on its own on
> > different occasion)
> > 
> > 
> > then i restart the daemon:
> > 
> > end of a strace -f /etc/init.d/bind9 start
> > 6541  rt_sigaction(SIGPIPE, {0xb7ca2a70, [], 0}, {SIG_IGN}, 8) = 0
> > 6541  send(3, "<30>Jun 23 00:51:35 named[6540]:"..., 82, 0) = 82
> > 6541  rt_sigaction(SIGPIPE, {SIG_IGN}, NULL, 8) = 0
> > 6541  socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP) = 10
> > 6541  fcntl64(10, F_DUPFD, 20)          = 32
> > 6541  close(10)                         = 0
> > 6541  fcntl64(32, F_GETFL)              = 0x2 (flags O_RDWR)
> > 6541  fcntl64(32, F_SETFL, O_RDWR|O_NONBLOCK) = 0
> > 6541  setsockopt(32, SOL_SOCKET, SO_TIMESTAMP, [1], 4) = 0
> > 6541  setsockopt(32, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
> > 6541  bind(32, {sa_family=AF_INET, sin_port=htons(53),
> > sin_addr=inet_addr("172.16.254.1")}, 16) = 0
> > 6541  socket(PF_INET, SOCK_STREAM, IPPROTO_TCP) = 10
> > 6541  fcntl64(10, F_DUPFD, 20
> 
> Aha, this has been extremely helpful. Could you all please try the
> following (untested) patch ? This should fix the problem, or
> atleast one problem that I can see.

On my system the patch apparently fixes the problem.  Excellent job! :-)

Thanks,
Rafael


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