linux-kernel - Re: 2.6.26-rc7: BUG at kernel/power/snapshot.c:493

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Message-ID: <20080711204023.GE6843@elf.ucw.cz>
Date:	Fri, 11 Jul 2008 22:40:23 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Soeren Sonnenburg <kernel@....de>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.26-rc7: BUG at kernel/power/snapshot.c:493

On Fri 2008-07-11 22:33:52, Rafael J. Wysocki wrote:
> On Friday, 11 of July 2008, Pavel Machek wrote:
> > Hi!
> > 
> > > > > Anyone else seeing this? Happened after resuming from s2both (from
> > > > > disk)...
> > > > 
> > > > At what point exactly did it happen?
> > > 
> > > I am attaching the full dmesg.
> > 
> > Something is seriously wrong here.
> > 
> > > usbcore: registered new interface driver usbhid
> > > usbhid: v2.6:USB HID core driver
> > > TCP cubic registered
> > > NET: Registered protocol family 10
> > > lo: Disabled Privacy Extensions
> > > Mobile IPv6
> > > NET: Registered protocol family 17
> > > NET: Registered protocol family 15
> > > Using IPI No-Shortcut mode
> > > RAMDISK: ext2 filesystem found at block 0
> > > RAMDISK: Loading 2000KiB [1 disk] into ram disk... |./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|./.-.\.|.done.

(1)
> > > EXT2-fs warning: checktime reached, running e2fsck is recommended
(2)
> > > VFS: Mounted root (ext2 filesystem).
> > > ------------[ cut here ]------------
> > > kernel BUG at kernel/power/snapshot.c:493!
> > > invalid opcode: 0000 [#1] PREEMPT SMP 
> > > Modules linked in:
> > 
> > This is _after_ we mounted filesystems... we should not be resuming at
> > this point.
> 
> This is an initrd, isn't it?

Does not look like so: it mounted some filesystem at (1), and
checktime is reached. I thought initrd is read-only RAM disk -- it
should not reach check time, no?

> In which case we can be resuming (using the user land "resume") exactly at this
> point, no?
>  
> > > Pid: 568, comm: linuxrc Not tainted (2.6.26-rc7-sonne #35)
> > > EIP: 0060:[<c0157f99>] EFLAGS: 00010282 CPU: 0
> > > EIP is at memory_bm_set_bit+0x29/0x30
> > > EAX: fffffff2 EBX: f7165f1c ECX: 00000000 EDX: 03000200
> > > ESI: f7115000 EDI: b7f2a008 EBP: f7165f28 ESP: f7165f18
> > >  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
> > > Process linuxrc (pid: 568, ti=f7164000 task=f7b65f80 task.ti=f7164000)
> > > Stack: f7165f1c 00000013 f7117000 00000002 f7165f5c c0158e9b bf96e5ec c02dd570 
> > >        00001000 c05fa980 00000008 00000008 00000000 00000000 f7000200 c05fa980 
> > >        b7f2a008 f7165f70 c015b3af f7000200 b7f2a008 00001000 f7165f90 c0185e28 
> > > Call Trace:
> > >  [<c0158e9b>] ? snapshot_write_next+0xcb/0x7a0
> > >  [<c02dd570>] ? write_chan+0x0/0x380
> > >  [<c015b3af>] ? snapshot_write+0x1f/0x70
> > >  [<c0185e28>] ? vfs_write+0x98/0x120
> > >  [<c015b390>] ? snapshot_write+0x0/0x70
> > >  [<c0185f6d>] ? sys_write+0x3d/0x70
> > >  [<c010333a>] ? syscall_call+0x7/0xb
> > >  =======================
> > > Code: 00 00 55 89 e5 53 83 ec 0c 8d 4d f8 8d 5d f4 89 1c 24 e8 4b ff ff ff 85 c0 75 10 8b 55 f8 8b 45 f4 f0 0f ab 02 83 c4 0c 5b 5d c3 <0f> 0b eb fe 8d 76 00 8b 0d 0c a9 5f c0 55 89 e5 85 c9 74 14 8b 
> > > EIP: [<c0157f99>] memory_bm_set_bit+0x29/0x30 SS:ESP 0068:f7165f18
> > > ---[ end trace 70a926e889075b3c ]---
> > 
> > > Clocksource tsc unstable (delta = -208377644 ns)
> > > kjournald starting.  Commit interval 5 seconds
> > > EXT3 FS on sda3, internal journal
> > > ext3_orphan_cleanup: deleting unreferenced inode 1805649
> > > ext3_orphan_cleanup: deleting unreferenced inode 1228813
> > > EXT3-fs: sda3: 2 orphan inodes deleted
> > > EXT3-fs: recovery complete.
> > > EXT3-fs: mounted filesystem with ordered data mode.
> > > VFS: Mounted root (ext3 filesystem).
> > > Trying to move old root to /initrd ... /initrd does not exist. Ignored.
> > > Unmounting old root
> > > Trying to free ramdisk memory ... okay
> > > Freeing unused kernel memory: 268k freed
> > > kjournald starting.  Commit interval 5 seconds
> > > EXT3-fs warning: mounting fs with errors, running e2fsck is recommended
> > > EXT3 FS on dm-0, internal journal
> > > EXT3-fs: recovery complete.
> > > EXT3-fs: mounted filesystem with ordered data mode.
> > 
> > You should really fsck at this point.
> 
> I don't really think so.

Well, "mounted fs with errors" indicates a problem, right?

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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