Re: [CFS Bandwidth Control v4 0/7] Introduction

From: Bharata B Rao
Date: Wed Feb 23 2011 - 03:31:47 EST

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In reply to: Paul Turner: "Re: [CFS Bandwidth Control v4 0/7] Introduction"
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On Tue, Feb 22, 2011 at 11:56:20PM -0800, Paul Turner wrote:
> On Tue, Feb 22, 2011 at 11:51 PM, Balbir Singh
> <balbir@xxxxxxxxxxxxxxxxxx> wrote:
> > * Paul Turner <pjt@xxxxxxxxxx> [2011-02-22 23:42:48]:
> >
> >> Thanks for the report Xiao -- I wasn't able to reproduce this yet with
> >> a simple guest, I will try a more modern image tomorrow.
> >>
> >> One suspicion is that this might be connected with the missing
> >> runnable accounting in sched_stoptask.c.
> >>
> >
> > I can confirm that, my guests work fine after the changes posted this
> > morning. I still see some lockdep errors, but none associated with the
> > scheduler.
> >
>
> Excellent!
>
> Ok, if this is resolved I'll roll this up and repost tomorrow, thanks!

As I said in an earlier reply, I too saw the lockups in guests. However those
lockups didn't occur consistently. After the sched_stoptask.c changes, I haven't
seen any lockups till now.

BTW, the lockups looked like this for me:

...
Mounting sysfs filesystem
Creating /dev
Creating initial device nodes
Loading /lib/kbd/keymaps/i386/qwerty/us.map
BUG: soft lockup - CPU#0 stuck for 61s! [init:1]
Modules linked in:

Pid: 1, comm: init Not tainted (2.6.27.24-170.2.68.fc10.i686 #1) KVM
EIP: 0060:[<c041b93e>] EFLAGS: 00000297 CPU: 0
EIP is at __ticket_spin_lock+0x13/0x19
EAX: c080ff00 EBX: 00000000 ECX: c05751ca EDX: 00008584
ESI: df92c904 EDI: dd700d80 EBP: df819e50 ESP: df819e50
DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
CR0: 8005003b CR2: 0805d3dc CR3: 1d706000 CR4: 000006d0
DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
DR6: ffff0ff0 DR7: 00000400
[<c06ab6cc>] lock_kernel+0x1f/0x2d
[<c05751dc>] tty_open+0x12/0x2aa
[<c0494a8c>] ? exact_match+0x0/0x7
[<c0494dc7>] chrdev_open+0x12b/0x142
[<c049141e>] __dentry_open+0x10e/0x1fc
[<c0491593>] nameidata_to_filp+0x1f/0x33
[<c0494c9c>] ? chrdev_open+0x0/0x142
[<c049b0b7>] do_filp_open+0x31c/0x611
[<c0422602>] ? set_next_entity+0x8b/0xf7
[<c041f81a>] ? need_resched+0x18/0x22
[<c049123c>] do_sys_open+0x42/0xb7
[<c04912f3>] sys_open+0x1e/0x26
[<c0404c8a>] syscall_call+0x7/0xb
=======================
BUG: soft lockup - CPU#3 stuck for 61s! [plymouthd:562]
Modules linked in:

Pid: 562, comm: plymouthd Not tainted (2.6.27.24-170.2.68.fc10.i686 #1) KVM
EIP: 0060:[<c041b93e>] EFLAGS: 00000293 CPU: 3
EIP is at __ticket_spin_lock+0x13/0x19
EAX: c080ff00 EBX: 00000000 ECX: df469198 EDX: 00008684
ESI: df469198 EDI: df424018 EBP: dd6b9dc0 ESP: dd6b9dc0
DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
CR0: 80050033 CR2: 0804e767 CR3: 1d6b7000 CR4: 000006d0
DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
DR6: ffff0ff0 DR7: 00000400
[<c06ab6cc>] lock_kernel+0x1f/0x2d
[<c04c827a>] proc_lookup_de+0x15/0xc0
[<c04c8337>] proc_lookup+0x12/0x17
[<c04c4934>] proc_root_lookup+0x11/0x2b
[<c0498fe2>] do_lookup+0xae/0x11e
[<c049a408>] __link_path_walk+0x57e/0x6b5
[<c049a92b>] path_walk+0x4c/0x9b
[<c049ab27>] do_path_lookup+0x12d/0x175
[<c049abb4>] __path_lookup_intent_open+0x45/0x76
[<c049abf5>] path_lookup_open+0x10/0x12
[<c049ae3c>] do_filp_open+0xa1/0x611
[<c04fadaa>] ? selinux_file_alloc_security+0x22/0x41
[<c052048c>] ? trace_hardirqs_on_thunk+0xc/0x10
[<c0404cd7>] ? restore_nocheck_notrace+0x0/0xe
[<c049123c>] do_sys_open+0x42/0xb7
[<c04912f3>] sys_open+0x1e/0x26
[<c0404c8a>] syscall_call+0x7/0xb
=======================
BUG: soft lockup - CPU#2 stuck for 63s! [setfont:559]
Modules linked in:

Pid: 559, comm: setfont Not tainted (2.6.27.24-170.2.68.fc10.i686 #1) KVM
EIP: 0060:[<c053a892>] EFLAGS: 00010283 CPU: 2
EIP is at vgacon_do_font_op+0x177/0x3ec
EAX: c095a1f8 EBX: df904000 ECX: 00000001 EDX: 00000043
ESI: 00000004 EDI: c095a1f4 EBP: dd743e0c ESP: dd743df0
DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
CR0: 8005003b CR2: 0826d000 CR3: 1d73c000 CR4: 000006d0
DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
DR6: ffff0ff0 DR7: 00000400
[<c053abac>] vgacon_font_set+0x59/0x208
[<c04427d8>] ? down+0x2b/0x2f
[<c053ab53>] ? vgacon_font_set+0x0/0x208
[<c057f659>] con_font_op+0x15c/0x378
[<c041f81a>] ? need_resched+0x18/0x22
[<c057a80f>] vt_ioctl+0x1338/0x14fd
[<c04fa419>] ? inode_has_perm+0x5b/0x65
[<c05794d7>] ? vt_ioctl+0x0/0x14fd
[<c0574b88>] tty_ioctl+0x665/0x6cf
[<c04fa689>] ? file_has_perm+0x7b/0x84
[<c0574523>] ? tty_ioctl+0x0/0x6cf
[<c049c74a>] vfs_ioctl+0x22/0x69
[<c049c9cc>] do_vfs_ioctl+0x23b/0x247
[<c04fa7ac>] ? selinux_file_ioctl+0x35/0x38
[<c049ca18>] sys_ioctl+0x40/0x5c
[<c0404c8a>] syscall_call+0x7/0xb
=======================
BUG: soft lockup - CPU#1 stuck for 63s! [loadkeys:560]
Modules linked in:

Pid: 560, comm: loadkeys Not tainted (2.6.27.24-170.2.68.fc10.i686 #1) KVM
EIP: 0060:[<c06ab54e>] EFLAGS: 00000282 CPU: 1
EIP is at _spin_unlock_irqrestore+0x2d/0x38
EAX: 00000282 EBX: 00000282 ECX: dd5b7f80 EDX: 00000282
ESI: c096f740 EDI: c096f7fc EBP: c08a5f78 ESP: c08a5f74
DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
CR0: 8005003b CR2: 009f0210 CR3: 1d73b000 CR4: 000006d0
DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
DR6: ffff0ff0 DR7: 00000400
[<c0593456>] serial8250_handle_port+0x220/0x230
[<c059114e>] ? serial_in+0x5a/0x61
[<c05934af>] serial8250_interrupt+0x49/0xc9
[<c0465313>] handle_IRQ_event+0x2f/0x64
[<c04662b5>] handle_edge_irq+0xb2/0xf4
[<c0466203>] ? handle_edge_irq+0x0/0xf4
[<c0406e6e>] do_IRQ+0xc7/0xfe
[<c0405668>] common_interrupt+0x28/0x30
[<c06ab54e>] ? _spin_unlock_irqrestore+0x2d/0x38
[<c058ef7d>] uart_start+0x4e/0x53
[<c058fa1e>] uart_write+0xce/0xd9
[<c0575d88>] write_chan+0x1e5/0x2b0
[<c0428218>] ? default_wake_function+0x0/0xd
[<c05742c9>] tty_write+0x155/0x1d5
[<c0575ba3>] ? write_chan+0x0/0x2b0
[<c05743a9>] redirected_tty_write+0x60/0x6d
[<c0574349>] ? redirected_tty_write+0x0/0x6d
[<c04930d6>] vfs_write+0x84/0xdf
[<c04931ca>] sys_write+0x3b/0x60
[<c0404c8a>] syscall_call+0x7/0xb
=======================
input: ImExPS/2 Generic Explorer Mouse as /devices/platform/i8042/serio1/input/input3
Setting up hotplug.
Creating block device nodes.
Creating character device nodes.
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Next message: Andrea Righi: "Re: [PATCH 0/5] blk-throttle: writeback and swap IO control"
Previous message: Dave Airlie: "Re: [PATCH] amd64-agp: fix crash at second module load"
In reply to: Paul Turner: "Re: [CFS Bandwidth Control v4 0/7] Introduction"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]