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Date: Wed, 23 Feb 2011 14:01:58 +0530 From: Bharata B Rao <bharata@...ux.vnet.ibm.com> To: Paul Turner <pjt@...gle.com> Cc: balbir@...ux.vnet.ibm.com, Xiao Guangrong <xiaoguangrong@...fujitsu.com>, linux-kernel@...r.kernel.org, Dhaval Giani <dhaval.giani@...il.com>, Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>, Srivatsa Vaddagiri <vatsa@...ibm.com>, Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>, Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Pavel Emelyanov <xemul@...nvz.org>, Herbert Poetzl <herbert@...hfloor.at>, Avi Kivity <avi@...hat.com>, Chris Friesen <cfriesen@...tel.com> Subject: Re: [CFS Bandwidth Control v4 0/7] Introduction 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@...ux.vnet.ibm.com> wrote: > > * Paul Turner <pjt@...gle.com> [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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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