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 <j...@suse.cz>
> AuthorDate: Thu May 22 10:43:35 2014 +1000
> Commit: Stephen Rothwell <s...@canb.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 <j...@suse.cz>
> Signed-off-by: Andrew Morton <a...@linux-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
> >the body of a message to majord...@vger.kernel.org
> >More majordomo info at http://vger.kernel.org/majordomo-info.html
> >Please read the FAQ at http://www.tux.org/lkml/
> >
>
--
Jan Kara <j...@suse.cz>
SUSE Labs, CR
--
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