On 11/13/06, David Miller <[EMAIL PROTECTED]> wrote:
From: "Arnaldo Carvalho de Melo" <[EMAIL PROTECTED]>
Date: Fri, 10 Nov 2006 16:32:16 -0200
> On 11/10/06, James Morris <[EMAIL PROTECTED]> wrote:
> > On Fri, 10 Nov 2006, James Morris wrote:
> >
> > > I wonder if this facility can be integrated more generally into the kernel
> > > protocol which people are developing.
> >
> > Ugh, editor screwup. That was meant to be
> >
> > I wonder if this facility can be integrated more generally into the kernel
> > as a kernel hacking option, as this is not the only protocol which people
> > are developing.
> >
>
> See:
>
http://www.erg.abdn.ac.uk/users/gerrit/dccp/patch-backlog/09a_release_ctl_socket_at_exit.diff
>
> This one requires a bit more thinking, so I'm postponing it for now to
> get the simple bits in Gerrit's patch queue cherrypicked and sent for
> Dave.
One possible way to handle this is to flag certain sockets such that
no refrence counting is done for them against the module. It is
an indication that the module will take care of such sockets on
cleanup.
It seems that this would limit the cost to a test at socket create
and destroy time.
Yes, but this is not the case currently with Gerrit's proposed patch,
I'm postponing it for now, as one has to be very very careful to
monitor the TW sockets with iproute2's ss before rmmoding with
--force, have to revisit the old unload hack to combine its ideas with
SCTP/Gerrit's approach, the old one was ugly, but at least refused to
unload before all the TW sockets were gone.
- Arnaldo
[EMAIL PROTECTED] ~]# rmmod dccp_ipv4
ERROR: Module dccp_ipv4 is in use by [unsafe]
[EMAIL PROTECTED] ~]# rmmod --force dccp_ipv4
[ 128.264180] slab error in kmem_cache_destroy(): cache
`tw_sock_DCCP': Can't free all objects
[ 128.265284] [<c0141ea7>] kmem_cache_destroy+0x77/0xd0
[ 128.266133] [<c0201dcf>] proto_unregister+0x8f/0xb0
[ 128.267222] [<d085005c>] dccp_v4_exit+0x3c/0x5b [dccp_ipv4]
[ 128.268050] [<c0128458>] sys_delete_module+0x158/0x1d0
[ 128.268527] [<c0269ada>] do_page_fault+0x4ea/0x640
[ 128.269014] [<c0102abf>] syscall_call+0x7/0xb
[ 128.269472] =======================
[EMAIL PROTECTED] ~]# rmmod dccp
[ 141.267175] slab error in kmem_cache_destroy(): cache
`dccp_bind_bucket': Can't free all objects
[ 141.268392] [<c0141ea7>] kmem_cache_destroy+0x77/0xd0
[ 141.268950] [<d0847e93>] dccp_fini+0x63/0x70 [dccp]
[ 141.270046] [<c0128458>] sys_delete_module+0x158/0x1d0
[ 141.270530] [<c013b6e4>] do_munmap+0x1c4/0x230
[ 141.270964] [<c0102abf>] syscall_call+0x7/0xb
[ 141.271414] =======================
Followed by:
<BIG SNIP>
[ 147.347021] =======================
[ 147.359334] Code: c3 08 e9 69 ff ff ff eb 0d 90 90 90 90 90 90 90
90 90 90 90 90 90 55 89 cd 57 56 89 c6 53 8d 04 ca 83 ec 08 8b 10 89
e7 89 14 24 <89> 62 04 8b 50 04 89 22 89 54 24 04 89 00 8b 14 24 89 40
04 39
[ 147.395025] EIP: [<c0115b05>] cascade+0x15/0x60 SS:ESP 0068:c0304fa4
[ 147.403619] <0>Kernel panic - not syncing: Fatal exception in interrupt
[ 147.482149]
-
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