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Date:	Fri, 30 May 2014 16:07:57 +0200
From:	Jan Kara <jack@...e.cz>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Sasha Levin <sasha.levin@...cle.com>, Jan Kara <jack@...e.cz>,
	pmladek@...e.cz, Andrew Morton <akpm@...ux-foundation.org>,
	Jet Chen <jet.chen@...el.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: console: lockup on boot

On Fri 30-05-14 09:58:14, Peter Hurley wrote:
> On 05/30/2014 09:11 AM, Sasha Levin wrote:
> >Hi all,
> >
> >I sometime see lockups when booting my KVM guest with the latest -next kernel,
> >it basically hangs right when it should start 'init', and after a while I get
> >the following spew:
> >
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> 
> Maybe related to this report: https://lkml.org/lkml/2014/5/30/26
> from Jet Chen which was bisected to
> 
> commit bafe980f5afc7ccc693fd8c81c8aa5a02fbb5ae0
> Author:     Jan Kara <jack@...e.cz>
> AuthorDate: Thu May 22 10:43:35 2014 +1000
> Commit:     Stephen Rothwell <sfr@...b.auug.org.au>
> CommitDate: Thu May 22 10:43:35 2014 +1000
> 
>     printk: enable interrupts before calling console_trylock_for_printk()
>         We need interrupts disabled when calling console_trylock_for_printk() only
>     so that cpu id we pass to can_use_console() remains valid (for other
>     things console_sem provides all the exclusion we need and deadlocks on
>     console_sem due to interrupts are impossible because we use
>     down_trylock()).  However if we are rescheduled, we are guaranteed to run
>     on an online cpu so we can easily just get the cpu id in
>     can_use_console().
>         We can lose a bit of performance when we enable interrupts in
>     vprintk_emit() and then disable them again in console_unlock() but OTOH it
>     can somewhat reduce interrupt latency caused by console_unlock()
>     especially since later in the patch series we will want to spin on
>     console_sem in console_trylock_for_printk().
>         Signed-off-by: Jan Kara <jack@...e.cz>
>     Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> 
> ?
  Yeah, very likely. I think I see the problem, I'll send the fix shortly.

								Honza
 
> >[   30.770667] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[   30.770667] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[  320.541585] kworker/dying (172) used greatest stack depth: 3656 bytes left
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  408.010589] INFO: task swapper/0:1 blocked for more than 200 seconds.
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[  321.761422] general protection fault: 0000 [#1]
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[ 2950.759251] BUG: spinlock lockup suspected on CPU#32, swapper/32/0
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[ 3109.224481] BUG: spinlock lockup suspected on CPU#32, swapper/32/0
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[ 3251.771402] BUG: spinlock lockup suspected on CPU#32, swapper/32/0
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[ 3401.522129] BUG: spinlock lockup suspected on CPU#32, swapper/32/0
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[ 3568.564422] BUG: spinlock lockup suspected on CPU#32, swapper/32/0
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[ 3754.638392] BUG: spinlock lockup suspected on CPU#32, swapper/32/0
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[ 3941.597288] BUG: spinlock lockup suspected on CPU#32, swapper/32/0
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[ 4114.243312] BUG: spinlock lockup suspected on CPU#32, swapper/32/0
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[ 4287.428963] BUG: spinlock lockup suspected on CPU#32, swapper/32/0
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[   30.790833] BUG: spinlock lockup suspected on CPU#1, swapper/1/0
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[  320.551104] BUG: spinlock lockup suspected on CPU#33, kworker/dying/172
> >[ 4458.566115] BUG: spinlock lockup suspected on CPU#32, swapper/32/0
> >[  408.020558] BUG: spinlock lockup suspected on CPU#43, khungtaskd/3760
> >[   30.790833] PANIC: double fault, error_code: 0x0
> >[  320.551104]  lock: console_sem+0x0/0x60, .magic: dead4ead, .owner: kworker/u101:1/484, .owner_cpu: -1
> >[  408.020558]  lock: console_sem+0x0/0x60, .magic: dead4ead, .owner: kworker/u101:1/484, .owner_cpu: 33
> >[  321.761422]  lock: console_sem+0x0/0x60, .magic: dead4ead, .owner: kworker/u101:1/484, .owner_cpu: -1
> >[  320.551104] CPU: 33 PID: 172 Comm: kworker/dying Tainted: G        W     3.15.0-rc7-next-20140529-sasha-00017-gd239c90-dirty #550
> >[  320.551104]  ffffffff8e087060 ffff88012a800b38 ffffffff8c4e92e3 0000000000000001
> >[   30.790833]  ffff88007bdd3000
> >[   30.790833] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G        W     3.15.0-rc7-next-20140529-sasha-00017-gd239c90-dirty #550
> >[   30.790833]  ffff88012a800b58
> >[   30.790833] task: ffff880a2b3f0000 ti: ffff88007c1d0000 task.ti: ffff88007c1d0000
> >[   30.790833]  ffffffff8c4dc9fe
> >[  320.551104] RIP:  (??:?)
> >[  320.551104]  ffffffff8e087060
> >[   30.790833]  0000000086c41770
> >[   30.790833] string.isra.5 (lib/vsprintf.c:506)
> >[   30.790833]  ffff88012a800b88
> >[   30.790833] RSP: 0000:ffff88012ba00000  EFLAGS: 00010092
> >[   30.790833]  ffffffff891d08b4
> >[   30.790833] RAX: ffffffff8d6ee711 RBX: ffffffff906949f0 RCX: 0000000000000000
> >[   30.790833]  ffffffff8e087078
> >[   30.790833] RDX: ffffffff8d6eb246 RSI: ffffffffffffffff RDI: ffffffff906949f0
> >[  320.551104]
> >[   30.790833] RBP: ffff88012ba00018 R08: 000000000000ffff R09: 000000000000ffff
> >[  320.551104] Call Trace:
> >[   30.790833] R10: 73203a4755423001 R11: 206b636f6c6e6970 R12: ffffffff90694dc0
> >[   30.790833] R13: ffffffff90694dc0 R14: 000000000000ffff R15: 0000000000000000
> >[   30.790833]  <UNK>
> >[   30.790833] FS:  0000000000000000(0000) GS:ffff88012ba00000(0000) knlGS:0000000000000000
> >[  321.761422] CPU: 0 PID: 484 Comm: kworker/u101:1 Tainted: G        W     3.15.0-rc7-next-20140529-sasha-00017-gd239c90-dirty #550
> >[   30.790833] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> >[  320.551104] sending NMI to all CPUs:
> >[   30.790833] CR2: ffff88012b9ffff8 CR3: 000000000e02c000 CR4: 00000000000006a0
> >[  321.761422] BUG: spinlock lockup suspected on CPU#0, kworker/u101:1/484
> >[  321.761422]  lock: logbuf_lock+0x0/0x48, .magic: dead4ead, .owner: kworker/u101:1/484, .owner_cpu: -1
> >[  321.761422] CPU: 0 PID: 484 Comm: kworker/u101:1 Tainted: G        W     3.15.0-rc7-next-20140529-sasha-00017-gd239c90-dirty #550
> >[  321.761422] Workqueue: events_power_efficient fb_flashcursor
> >[  321.761422]  ffffffff8e087000 ffff88007da06c78 ffffffff8c4e92e3 0000000000000000
> >[  321.761422]  ffff88007bdd3000 ffff88007da06c98 ffffffff8c4dc9fe ffffffff8e087000
> >[  321.761422]  0000000086c41770 ffff88007da06cc8 ffffffff891d08b4 ffffffff8e087018
> >[  321.761422] Call Trace:
> >[  321.761422] <NMI> dump_stack (lib/dump_stack.c:52)
> >[  321.761422] spin_dump (kernel/locking/spinlock_debug.c:68 (discriminator 6))
> >[  321.761422] do_raw_spin_lock (include/linux/nmi.h:35 kernel/locking/spinlock_debug.c:119 kernel/locking/spinlock_debug.c:137)
> >[  321.761422] _raw_spin_lock (include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:151)
> >[  321.761422] ? vprintk_emit (kernel/printk/printk.c:1620)
> >[  321.761422] vprintk_emit (kernel/printk/printk.c:1620)
> >[  321.761422] printk (kernel/printk/printk.c:1806)
> >[  321.761422] arch_trigger_all_cpu_backtrace_handler (arch/x86/kernel/apic/hw_nmi.c:85)
> >[  321.761422] nmi_handle (arch/x86/kernel/nmi.c:133)
> >[  321.761422] ? nmi_handle (arch/x86/kernel/nmi.c:114)
> >[  321.761422] default_do_nmi (arch/x86/kernel/nmi.c:336)
> >[  321.761422] ? get_color.isra.12 (drivers/video/console/fbcon.c:369)
> >[  321.761422] do_nmi (./arch/x86/include/asm/current.h:14 arch/x86/kernel/nmi.c:540)
> >[  321.761422] end_repeat_nmi (arch/x86/kernel/entry_64.S:1701)
> >[  321.761422] ? get_color.isra.12 (drivers/video/console/fbcon.c:369)
> >[  321.761422] ? get_color.isra.12 (drivers/video/console/fbcon.c:369)
> >[  321.761422] ? get_symbol_pos (kernel/kallsyms.c:230)
> >[  321.761422] ? get_symbol_pos (kernel/kallsyms.c:230)
> >[  321.761422] ? get_symbol_pos (kernel/kallsyms.c:230)
> >[  321.761422]  <<EOE>>  <UNK>
> >[  321.761422] NMI backtrace for cpu 0
> >[  321.761422] CPU: 0 PID: 484 Comm: kworker/u101:1 Tainted: G        W     3.15.0-rc7-next-20140529-sasha-00017-gd239c90-dirty #550
> >[  321.761422] Workqueue: events_power_efficient fb_flashcursor
> >[  321.761422] task: ffff88007bdd3000 ti: ffff88007bde8000 task.ti: ffff88007bde8000
> >[  321.761422] RIP: get_symbol_pos (kernel/kallsyms.c:230)
> >[  321.761422] RSP: 0000:ffff88007bde5c78  EFLAGS: 00000006
> >[  321.761422] RAX: 0000000000008c7c RBX: ffff88007bde5cd0 RCX: 0000000000009831
> >[  321.761422] RDX: ffff88007bde5cd8 RSI: ffff88007bde5ce0 RDI: ffffffff89bba9c0
> >[  321.761422] RBP: ffff88007bde5c78 R08: 000000000000a3e6 R09: 000000000000ffff
> >[  321.761422] R10: 000000000005da8d R11: 3a6d6d6f43203438 R12: ffff88007bde5d41
> >[  321.761422] R13: ffffffff89bba9c0 R14: 0000000000000000 R15: ffffffff8d6e8c47
> >[  321.761422] FS:  0000000000000000(0000) GS:ffff88007da00000(0000) knlGS:0000000000000000
> >[  321.761422] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> >[  321.761422] CR2: 00000000ffffffff CR3: 000000000e02c000 CR4: 00000000000006b0
> >[  321.761422] Stack:
> >[  321.761422]  ffff88007bde5cb8 ffffffff8920eb4e 70202c786c383025 ffff88007bde5e31
> >[  321.761422]  ffff8800fbde5e2b ffff88007bde5d41 ffffffff89bba9c0 0000000000000000
> >[  321.761422]  ffff88007bde5d08 ffffffff8920ec42 522829676e6fffff 296e656c3e2d4345
> >[  321.761422] Call Trace:
> >[  321.761422]  <UNK>
> >[ 321.761422] Code: 30 0e f7 8c 55 48 85 c0 48 89 e5 75 02 0f 0b 4c 8b 15 ca fc 04 04 31 c0 4d 89 d0 eb 16 48 d1 e9 48 01 c1 48 39 3c cd 30 0e f7 8c <4c> 0f 47 c1 48 0f 46 c1 4c 89 c1 48 29 c1 48 83 f9 01 77 de 48
> >All code
> >========
> >    0:	30 0e                	xor    %cl,(%rsi)
> >    2:	f7                   	(bad)
> >    3:	8c 55 48             	mov    %ss,0x48(%rbp)
> >    6:	85 c0                	test   %eax,%eax
> >    8:	48 89 e5             	mov    %rsp,%rbp
> >    b:	75 02                	jne    0xf
> >    d:	0f 0b                	ud2
> >    f:	4c 8b 15 ca fc 04 04 	mov    0x404fcca(%rip),%r10        # 0x404fce0
> >   16:	31 c0                	xor    %eax,%eax
> >   18:	4d 89 d0             	mov    %r10,%r8
> >   1b:	eb 16                	jmp    0x33
> >   1d:	48 d1 e9             	shr    %rcx
> >   20:	48 01 c1             	add    %rax,%rcx
> >   23:	48 39 3c cd 30 0e f7 	cmp    %rdi,-0x7308f1d0(,%rcx,8)
> >   2a:	8c
> >   2b:*	4c 0f 47 c1          	cmova  %rcx,%r8		<-- trapping instruction
> >   2f:	48 0f 46 c1          	cmovbe %rcx,%rax
> >   33:	4c 89 c1             	mov    %r8,%rcx
> >   36:	48 29 c1             	sub    %rax,%rcx
> >   39:	48 83 f9 01          	cmp    $0x1,%rcx
> >   3d:	77 de                	ja     0x1d
> >   3f:	48                   	rex.W
> >	...
> >
> >Code starting with the faulting instruction
> >===========================================
> >    0:	4c 0f 47 c1          	cmova  %rcx,%r8
> >    4:	48 0f 46 c1          	cmovbe %rcx,%rax
> >    8:	4c 89 c1             	mov    %r8,%rcx
> >    b:	48 29 c1             	sub    %rax,%rcx
> >    e:	48 83 f9 01          	cmp    $0x1,%rcx
> >   12:	77 de                	ja     0xfffffffffffffff2
> >   14:	48                   	rex.W
> >	...
> >[   30.790833] NMI backtrace for cpu 1
> >[hang]
> >
> >
> >Thanks,
> >Sasha
> >--
> >To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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> >More majordomo info at  http://vger.kernel.org/majordomo-info.html
> >Please read the FAQ at  http://www.tux.org/lkml/
> >
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
--
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