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xen-devel
Re: [Xen-devel] [PATCH] xencommons: kill xenstored when stop xencommons
Hi,
Yu Zhiguo wrote:
> xenstored should be killed when stop xencommons.
>
> do_stop () {
> + if read 2>/dev/null <$XENSTORED_PIDFILE pid; then
> + kill $pid
> + while kill -9 $pid >/dev/null 2>&1; do sleep 0.1; done
> + rm -f $XENSTORED_PIDFILE
> + fi
> +
It seems that kill xenstored will get taint message about
'HARDIRQ-safe -> HARDIRQ-unsafe'.
Maybe some fix is needed here...
# service xencommons start
# cat /var/run/xenstore.pid
1446
# kill -9 1446
Jun 22 22:51:10 localhost kernel:
======================================================
Jun 22 22:51:10 localhost kernel: [ INFO: HARDIRQ-safe -> HARDIRQ-unsafe lock
order detected ]
Jun 22 22:51:10 localhost kernel: 2.6.31.13 #2
Jun 22 22:51:10 localhost kernel:
------------------------------------------------------
Jun 22 22:51:10 localhost kernel: xenstored/1446 [HC0[0]:SC0[0]:HE0:SE1] is
trying to acquire:
Jun 22 22:51:10 localhost kernel: (proc_subdir_lock){+.+...}, at:
[<ffffffff8119c60f>] xlate_proc_name+0x4c/0xde
Jun 22 22:51:10 localhost kernel:
Jun 22 22:51:10 localhost kernel: and this task is already holding:
Jun 22 22:51:10 localhost kernel: (&port_user_lock){-.....}, at:
[<ffffffff8131d3fe>] evtchn_release+0x3a/0xb8
Jun 22 22:51:10 localhost kernel: which would create a new lock dependency:
Jun 22 22:51:10 localhost kernel: (&port_user_lock){-.....} ->
(proc_subdir_lock){+.+...}
Jun 22 22:51:10 localhost kernel:
Jun 22 22:51:10 localhost kernel: but this new dependency connects a
HARDIRQ-irq-safe lock:
Jun 22 22:51:10 localhost kernel: (&port_user_lock){-.....}
Jun 22 22:51:10 localhost kernel: ... which became HARDIRQ-irq-safe at:
Jun 22 22:51:10 localhost kernel: [<ffffffff8109915d>]
__lock_acquire+0x254/0xc0e
Jun 22 22:51:10 localhost kernel: [<ffffffff81099c05>] lock_acquire+0xee/0x12e
Jun 22 22:51:10 localhost kernel: [<ffffffff81521f7f>] _spin_lock+0x45/0x8e
Jun 22 22:51:10 localhost kernel: [<ffffffff8131dbfd>]
evtchn_interrupt+0x3a/0x13f
Jun 22 22:51:10 localhost kernel: [<ffffffff810c7dd4>]
handle_IRQ_event+0x62/0x148
Jun 22 22:51:10 localhost kernel: [<ffffffff810ca367>]
handle_level_irq+0x90/0xf9
Jun 22 22:51:10 localhost kernel: [<ffffffff813151f1>]
xen_evtchn_do_upcall+0x120/0x1c7
Jun 22 22:51:10 localhost kernel: [<ffffffff8101637e>]
xen_do_hypervisor_callback+0x1e/0x30
Jun 22 22:51:10 localhost kernel: [<ffffffffffffffff>] 0xffffffffffffffff
Jun 22 22:51:10 localhost kernel:
Jun 22 22:51:10 localhost kernel: to a HARDIRQ-irq-unsafe lock:
Jun 22 22:51:10 localhost kernel: (proc_subdir_lock){+.+...}
Jun 22 22:51:10 localhost kernel: ... which became HARDIRQ-irq-unsafe at:
Jun 22 22:51:10 localhost kernel: ... [<ffffffff810991d1>]
__lock_acquire+0x2c8/0xc0e
Jun 22 22:51:10 localhost kernel: [<ffffffff81099c05>] lock_acquire+0xee/0x12e
Jun 22 22:51:10 localhost kernel: [<ffffffff81521f7f>] _spin_lock+0x45/0x8e
Jun 22 22:51:10 localhost kernel: [<ffffffff8119c60f>]
xlate_proc_name+0x4c/0xde
Jun 22 22:51:10 localhost kernel: [<ffffffff8119d370>] __proc_create+0x53/0x148
Jun 22 22:51:10 localhost kernel: [<ffffffff8119d75d>] proc_symlink+0x3e/0xc5
Jun 22 22:51:10 localhost kernel: [<ffffffff81a49c03>] proc_root_init+0x75/0xe0
Jun 22 22:51:10 localhost kernel: [<ffffffff81a2063b>] start_kernel+0x403/0x44c
Jun 22 22:51:10 localhost kernel: [<ffffffff81a1f930>]
x86_64_start_reservations+0xbb/0xd6
Jun 22 22:51:10 localhost kernel: [<ffffffff81a23e98>]
xen_start_kernel+0x5e3/0x5ea
Jun 22 22:51:10 localhost kernel: [<ffffffffffffffff>] 0xffffffffffffffff
Jun 22 22:51:10 localhost kernel:
Jun 22 22:51:10 localhost kernel: other info that might help us debug this:
...
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