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Message-ID: <2859519.IO8aRDjQvR@vostro.rjw.lan>
Date: Fri, 02 Nov 2012 23:43:50 +0100
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Daniel Vetter <daniel.vetter@...ll.ch>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Linux PM list <linux-pm@...r.kernel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
David Airlie <airlied@...ux.ie>, Michal Hocko <mhocko@...e.cz>,
Jiri Kosina <jkosina@...e.cz>
Subject: Re: Linux 3.7-rc3
On Friday, November 02, 2012 03:26:22 PM Linus Torvalds wrote:
> On Fri, Nov 2, 2012 at 3:23 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> >
> > Well, it appears that Tumbleweed has acquired a broken s2disk binary.
> > Replace it with one built from upstream sources and it magically starts to
> > work. Grumble.
> >
> > Sorry for the noise.
>
> Heh. This was the report that so far made me most worried about the
> current state of the -rc process, so I'll curse you and be very
> relieved at the same time ;)
Well, not everything is rosy in the suspend land, though. This is a
failure to freeze khubd during the second in a row attempt to suspend to
RAM (your current tree):
[ 105.679281] PM: Syncing filesystems ... done.
[ 105.693722] PM: Preparing system for mem sleep
[ 105.760289] Freezing user space processes ... (elapsed 0.01 seconds) done.
[ 115.398131] usb 5-2: device descriptor read/64, error -110
[ 115.601126] usb 5-2: new full-speed USB device number 4 using uhci_hcd
[ 105.775886] Freezing remaining freezable tasks ...
[ 125.780627] Freezing of tasks failed after 20.00 seconds (1 tasks refusing to freeze, wq_busy=0):
[ 125.780718] khubd D ffff88007c920000
[ 125.780730] ===============================
[ 125.780766] [ INFO: suspicious RCU usage. ]
[ 125.780804] 3.7.0-rc3+ #988 Not tainted
[ 125.780838] -------------------------------
[ 125.780875] /home/rafael/src/linux/kernel/sched/core.c:4497 suspicious rcu_dereference_check() usage!
[ 125.780946]
[ 125.780946] other info that might help us debug this:
[ 125.780946]
[ 125.781031]
[ 125.781031] rcu_scheduler_active = 1, debug_locks = 0
[ 125.781087] 4 locks held by s2ram/4211:
[ 125.781120] #0: (&buffer->mutex){+.+.+.}, at: [<ffffffff811e2acf>] sysfs_write_file+0x3f/0x160
[ 125.781233] #1: (s_active#94){.+.+.+}, at: [<ffffffff811e2b58>] sysfs_write_file+0xc8/0x160
[ 125.781339] #2: (pm_mutex){+.+.+.}, at: [<ffffffff81090a81>] pm_suspend+0x81/0x230
[ 125.781439] #3: (tasklist_lock){.?.?..}, at: [<ffffffff8108feed>] try_to_freeze_tasks+0x2cd/0x3f0
[ 125.781543]
[ 125.781543] stack backtrace:
[ 125.781584] Pid: 4211, comm: s2ram Not tainted 3.7.0-rc3+ #988
[ 125.781632] Call Trace:
[ 125.781662] [<ffffffff810a3c73>] lockdep_rcu_suspicious+0x103/0x140
[ 125.781719] [<ffffffff8107cf21>] sched_show_task+0x121/0x180
[ 125.781770] [<ffffffff8108ffb4>] try_to_freeze_tasks+0x394/0x3f0
[ 125.781823] [<ffffffff810903b5>] freeze_kernel_threads+0x25/0x80
[ 125.781876] [<ffffffff81090b65>] pm_suspend+0x165/0x230
[ 125.781924] [<ffffffff8108fa29>] state_store+0x99/0x100
[ 125.781975] [<ffffffff812f5867>] kobj_attr_store+0x17/0x20
[ 125.782038] [<ffffffff811e2b71>] sysfs_write_file+0xe1/0x160
[ 125.782091] [<ffffffff811667a6>] vfs_write+0xc6/0x180
[ 125.782138] [<ffffffff81166ada>] sys_write+0x5a/0xa0
[ 125.782185] [<ffffffff812ff6ae>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[ 125.782242] [<ffffffff81669dd2>] system_call_fastpath+0x16/0x1b
[ 125.782294] 0 29 2 0x00000000
[ 125.782329] ffff88007cb099d8 0000000000000046 ffff88007cb09998 ffffffff810a865e
[ 125.784196] ffff88007cb09fd8 ffff88007cb06040 ffff88007cb09fd8 ffff88007cb08000
[ 125.786048] ffff88007cb09fd8 ffff88007cb08000 00000000000131c0 ffff88007cb09fd8
[ 125.787879] Call Trace:
[ 125.789655] [<ffffffff810a865e>] ? mark_held_locks+0x6e/0x130
[ 125.791465] [<ffffffff81667854>] schedule+0x24/0x70
[ 125.793278] [<ffffffff81664af3>] schedule_timeout+0x173/0x480
[ 125.795118] [<ffffffff810507c0>] ? lock_timer_base+0x70/0x70
[ 125.796975] [<ffffffff81666cc1>] wait_for_common+0xd1/0x170
[ 125.798836] [<ffffffff8107d6a0>] ? try_to_wake_up+0x320/0x320
[ 125.800665] [<ffffffff81666dee>] wait_for_completion_timeout+0xe/0x10
[ 125.802524] [<ffffffff814903ab>] usb_start_wait_urb+0xdb/0x170
[ 125.804382] [<ffffffff8149067c>] usb_control_msg+0xdc/0x110
[ 125.806208] [<ffffffff814873a9>] hub_port_init+0x649/0xa50
[ 125.808002] [<ffffffff810a88bd>] ? trace_hardirqs_on+0xd/0x10
[ 125.809749] [<ffffffff8148a38f>] hub_thread+0x6ff/0x1670
[ 125.811448] [<ffffffff81069a50>] ? wake_up_bit+0x40/0x40
[ 125.813111] [<ffffffff81489c90>] ? usb_new_device+0x2c0/0x2c0
[ 125.814774] [<ffffffff810691f6>] kthread+0xd6/0xe0
[ 125.816440] [<ffffffff81069120>] ? flush_kthread_worker+0x1a0/0x1a0
[ 125.818117] [<ffffffff81669d2c>] ret_from_fork+0x7c/0xb0
[ 125.819797] [<ffffffff81069120>] ? flush_kthread_worker+0x1a0/0x1a0
[ 125.821521]
[ 125.823147] Restarting kernel threads ... done.
[ 125.825210] Restarting tasks ... done.
Rafael
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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