Re: page_mapcount(page) went negative

From: Dave Jones
Date: Sun Jan 07 2007 - 12:36:46 EST

On Tue, Dec 19, 2006 at 04:20:37PM +1100, Nick Piggin wrote:
> Dave Jones wrote:
>
> > Eeek! page_mapcount(page) went negative! (-2)
>
> Hmm, probably happened once before, too.
>
> > page->flags = 404
>
> What's that? PG_referenced|PG_reserved? So I'd say it is likely
> that some driver has got its refcounting wrong.
>
> Unfortunately, this debugging output is almost useless when it
> comes to trying to track down the problem any further.
>
> And I see we've got another report for 2.6.19.1 from Chris, which
> is equally vague.
>
> IMO the pattern is much too consistent to be able to attribute
> them all to hardware problems. And considering it takes so long
> for these things to appear, can we get something like the attached
> patch upstream at least until we manage to stamp them out? Any
> other debugging info we can add?

I finally got another trace out of a 2.6.19.1 with this debug patch..
I'm starting to wonder if this is hardware related.
That box makes me suspicious as its motherboard has a bunch
of bulging capacitors on it. I had three of these, the previous
two died like so: http://www.flickr.com/photos/kernelslacker/251807263/in/set-72157594298237090/
This board hasn't started 'oozing' yet, but I think it may be on
the cards.

iirc, the previous oopses were around the same time of morning,
whilst cron.daily was hammering the hell out of the disk.
Either there's a subtle bug, or this board just can't take the pressure.

Dave

Jan 7 04:24:35 firewall kernel: Eeek! page_mapcount(page) went negative! (-1)
Jan 7 04:24:35 firewall kernel: page->flags = 414
Jan 7 04:24:35 firewall kernel: page->count = 1
Jan 7 04:24:35 firewall kernel: page->mapping = 00000000
Jan 7 04:24:35 firewall kernel: vma->vm_ops->nopage = filemap_nopage+0x0/0x33e
Jan 7 04:24:35 firewall kernel: ------------[ cut here ]------------
Jan 7 04:24:35 firewall kernel: kernel BUG at mm/rmap.c:581!
Jan 7 04:24:35 firewall kernel: invalid opcode: 0000 [#1]
Jan 7 04:24:35 firewall kernel: SMP
Jan 7 04:24:35 firewall kernel: last sysfs file: /class/net/lo/type
Jan 7 04:24:35 firewall kernel: Modules linked in: tun ipt_MASQUERADE iptable_nat ip_nat ipt_LOG xt_limit ipv6 ip_conntrack_netbios_ns ipt_REJECT xt_state i
p_conntrack nfnetlink xt_tcpudp iptable_filter ip_tables x_tables video sbs i2c_ec button battery asus_acpi ac parport_pc lp parport sr_mod sg pcspkr i2c_via
pro ide_cd i2c_core 3c59x via_rhine cdrom mii via_ircc irda crc_ccitt serio_raw dm_snapshot dm_zero dm_mirror dm_mod ext3 jbd ehci_hcd ohci_hcd uhci_hcd
Jan 7 04:24:35 firewall kernel: CPU: 0
Jan 7 04:24:35 firewall kernel: EIP: 0060:[<c046d995>] Not tainted VLI
Jan 7 04:24:35 firewall kernel: EFLAGS: 00010286 (2.6.19-1.2886.fc6debug #1)
Jan 7 04:24:35 firewall kernel: EIP is at page_remove_rmap+0x8b/0xac
Jan 7 04:24:35 firewall kernel: eax: 00000034 ebx: c1000000 ecx: c042818c edx: da0b3550
Jan 7 04:24:35 firewall kernel: esi: daecd0c0 edi: 00000020 ebp: cd386140 esp: ce2f4dc4
Jan 7 04:24:35 firewall kernel: ds: 007b es: 007b ss: 0068
Jan 7 04:24:35 firewall kernel: Process zcat (pid: 22721, ti=ce2f4000 task=da0b3550 task.ti=ce2f4000)
Jan 7 04:24:35 firewall kernel: Stack: c066b7b6 00000000 c1000000 08050000 c0467c63 c06c7f10 00000046 00000000
Jan 7 04:24:35 firewall kernel: daecd0c0 ce2f4e44 003f7ffd 00000000 00000001 08055000 cf354080 dde93520
Jan 7 04:24:35 firewall kernel: c1401e80 00000000 fffffff9 dde9358c cf354080 08055000 00000000 ce2f4e44
Jan 7 04:24:35 firewall kernel: Call Trace:
Jan 7 04:24:35 firewall kernel: [<c0467c63>] unmap_vmas+0x2a6/0x536
Jan 7 04:24:35 firewall kernel: [<c046aaa8>] exit_mmap+0x77/0x105
Jan 7 04:24:35 firewall kernel: [<c0425471>] mmput+0x37/0x80
Jan 7 04:24:35 firewall kernel: [<c042a4b5>] do_exit+0x21c/0x7a3
Jan 7 04:24:35 firewall kernel: [<c042aac9>] sys_exit_group+0x0/0xd
Jan 7 04:24:35 firewall kernel: [<c043383d>] get_signal_to_deliver+0x38b/0x3b3
Jan 7 04:24:35 firewall kernel: [<c0403677>] do_notify_resume+0x83/0x6c6
Jan 7 04:24:35 firewall kernel: [<c0404159>] work_notifysig+0x13/0x1a
Jan 7 04:24:35 firewall kernel: [<0804a84e>] 0x804a84e
Jan 7 04:24:35 firewall kernel: =======================
Jan 7 04:24:35 firewall kernel: Code: 4c a4 fb ff 8b 43 10 c7 04 24 b6 b7 66 c0 89 44 24 04 e8 39 a4 fb ff 8b 46 40 85 c0 74 0d 8b 50 08 b8 cf b7 66 c0 e8 d
8 a9 fd ff <0f> 0b 45 02 4b b7 66 c0 8b 53 10 89 d8 59 5b 5b 5e 83 f2 01 83
Jan 7 04:24:35 firewall kernel: EIP: [<c046d995>] page_remove_rmap+0x8b/0xac SS:ESP 0068:ce2f4dc4
Jan 7 04:24:35 firewall kernel: <3>BUG: sleeping function called from invalid context at kernel/rwsem.c:20
Jan 7 04:24:35 firewall kernel: in_atomic():1, irqs_disabled():0
Jan 7 04:24:35 firewall kernel: [<c0405108>] dump_trace+0x69/0x1b6
Jan 7 04:24:35 firewall kernel: [<c040526d>] show_trace_log_lvl+0x18/0x2c
Jan 7 04:24:35 firewall kernel: [<c0405868>] show_trace+0xf/0x11
Jan 7 04:24:35 firewall kernel: [<c0405965>] dump_stack+0x15/0x17
Jan 7 04:24:35 firewall kernel: [<c043ccca>] down_read+0x15/0x4e
Jan 7 04:24:35 firewall kernel: [<c04345b6>] blocking_notifier_call_chain+0xe/0x29
Jan 7 04:24:35 firewall kernel: [<c042a2b4>] do_exit+0x1b/0x7a3
Jan 7 04:24:35 firewall kernel: [<c0405809>] die+0x2c3/0x2e8
Jan 7 04:24:35 firewall kernel: [<c0405d4a>] do_invalid_op+0xa2/0xab
Jan 7 04:24:35 firewall kernel: [<c063f7a1>] error_code+0x39/0x40
Jan 7 04:24:35 firewall kernel: [<c046d995>] page_remove_rmap+0x8b/0xac
Jan 7 04:24:35 firewall kernel: [<c0467c63>] unmap_vmas+0x2a6/0x536
Jan 7 04:24:35 firewall kernel: [<c046aaa8>] exit_mmap+0x77/0x105
Jan 7 04:24:35 firewall kernel: [<c0425471>] mmput+0x37/0x80
Jan 7 04:24:35 firewall kernel: [<c042a4b5>] do_exit+0x21c/0x7a3
Jan 7 04:24:35 firewall kernel: [<c042aac9>] sys_exit_group+0x0/0xd
Jan 7 04:24:35 firewall kernel: [<c043383d>] get_signal_to_deliver+0x38b/0x3b3
Jan 7 04:24:35 firewall kernel: [<c0403677>] do_notify_resume+0x83/0x6c6
Jan 7 04:24:35 firewall kernel: [<c0404159>] work_notifysig+0x13/0x1a
Jan 7 04:24:35 firewall kernel: [<0804a84e>] 0x804a84e
Jan 7 04:24:35 firewall kernel: =======================
Jan 7 04:24:35 firewall kernel: Fixing recursive fault but reboot is needed!
Jan 7 04:24:35 firewall kernel: BUG: scheduling while atomic: zcat/0x00000001/22721
Jan 7 04:24:35 firewall kernel: [<c0405108>] dump_trace+0x69/0x1b6
Jan 7 04:24:35 firewall kernel: [<c040526d>] show_trace_log_lvl+0x18/0x2c
Jan 7 04:24:35 firewall kernel: [<c0405868>] show_trace+0xf/0x11
Jan 7 04:24:35 firewall kernel: [<c0405965>] dump_stack+0x15/0x17
Jan 7 04:24:35 firewall kernel: [<c063c72f>] __sched_text_start+0x4f/0xa58
Jan 7 04:24:35 firewall kernel: [<c042a397>] do_exit+0xfe/0x7a3
Jan 7 04:24:35 firewall kernel: [<c0405809>] die+0x2c3/0x2e8
Jan 7 04:24:35 firewall kernel: [<c0405d4a>] do_invalid_op+0xa2/0xab
Jan 7 04:24:35 firewall kernel: [<c063f7a1>] error_code+0x39/0x40
Jan 7 04:24:35 firewall kernel: [<c046d995>] page_remove_rmap+0x8b/0xac
Jan 7 04:24:35 firewall kernel: [<c0467c63>] unmap_vmas+0x2a6/0x536
Jan 7 04:24:35 firewall kernel: [<c046aaa8>] exit_mmap+0x77/0x105
Jan 7 04:24:35 firewall kernel: [<c0425471>] mmput+0x37/0x80
Jan 7 04:24:35 firewall kernel: [<c042a4b5>] do_exit+0x21c/0x7a3
Jan 7 04:24:35 firewall kernel: [<c042aac9>] sys_exit_group+0x0/0xd
Jan 7 04:24:35 firewall kernel: [<c043383d>] get_signal_to_deliver+0x38b/0x3b3
Jan 7 04:24:35 firewall kernel: [<c0403677>] do_notify_resume+0x83/0x6c6
Jan 7 04:24:35 firewall kernel: [<c0404159>] work_notifysig+0x13/0x1a
Jan 7 04:24:35 firewall kernel: [<0804a84e>] 0x804a84e
Jan 7 04:24:35 firewall kernel: =======================


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