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From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Ignacy Gawedzki <lkml@qult.net>
Subject: Re: kernel BUG at mm/rmap.c:631!
Date: Sun, 17 Feb 2008 21:16:36 +0100
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On Sunday, 17 of February 2008, Ignacy Gawedzki wrote:
> Hi,

Hi,

> I was printing on the parallel port and suddenly the "parallel" CUPS backend
> went 50% CPU (obviously endless-looping), while the other 50% were eaten by
> ghostscript (strace didn't show anything, so this might be an "internal"
> loop).  When I eventually killed the latter, I got this:

Which kernel is this?  Is it a regression?  If so, what's the last known
working kernel?

Thanks,
Rafael


> Eeek! page_mapcount(page) went negative! (-1)
>   page pfn = 3
>   page->flags = 80014
>   page->count = 0
>   page->mapping = 00000000
>   vma->vm_ops = _stext+0x3feff000/0x14
> ------------[ cut here ]------------
> kernel BUG at mm/rmap.c:631!
> invalid opcode: 0000 [#1] 
> Modules linked in: cls_fw sch_prio sch_htb iptable_nat xt_limit xt_state
> ipt_REJECT xt_tcpudp ipt_LOG xt_DSCP xt_dscp xt_mark nf_conntrack_ipv4
> xt_CONNMARK xt_MARK iptable_mangle iptable_filter ip_tables x_tables aes_i586
> geode_aes aes_generic ieee80211_crypt_ccmp lirc_dev nf_nat_ftp nf_nat
> nf_conntrack_ftp nf_conntrack ipv6 evdev hostap_pci hostap ieee80211_crypt
> i2c_viapro via686a ide_cd
> 
> Pid: 5098, comm: gs Tainted: GF       (2.6.24.1 #9)
> EIP: 0060:[<c01443f1>] EFLAGS: 00010246 CPU: 0
> EIP is at page_remove_rmap+0xe4/0x111
> EAX: 00000000 EBX: c1000060 ECX: 00000046 EDX: 00005a52
> ESI: e90d3f44 EDI: ea61b720 EBP: b7000000 ESP: eefc7e00
>  DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
> Process gs (pid: 5098, ti=eefc6000 task=ea6fd570 task.ti=eefc6000)
> Stack: c0398eb6 00000000 c1000060 b6dc8000 c013f6c8 0000326b 00000000 e90d3f44 
>        eefc7e74 00000000 00000001 ef371b6c ef1073a0 c0454f98 ffffffa0 ffffffff 
>        ef371b6c 000eaeb1 b70bc000 00000000 eefc7e74 e90d3860 ef1073a0 eefc7f10 
> Call Trace:
>  [<c013f6c8>] unmap_vmas+0x23e/0x403
>  [<c0141c3e>] exit_mmap+0x5f/0xc9
>  [<c0116a82>] mmput+0x1b/0x5e
>  [<c011a8f8>] do_exit+0x1ad/0x5ae
>  [<c011ad4a>] sys_exit_group+0x0/0xd
>  [<c0120962>] get_signal_to_deliver+0x370/0x380
>  [<c02cf89e>] net_rx_action+0x70/0x144
>  [<c026d8bb>] intr_handler+0x9c/0xcf
>  [<c0111f67>] do_page_fault+0x0/0x52d
>  [<c0103326>] do_notify_resume+0x81/0x5c0
>  [<c013ff5d>] handle_mm_fault+0x70/0x49d
>  [<c010455b>] common_interrupt+0x23/0x28
>  [<c01120f3>] do_page_fault+0x18c/0x52d
>  [<c0336dc2>] schedule+0x1f3/0x20d
>  [<c0111f67>] do_page_fault+0x0/0x52d
>  [<c0103c4e>] work_notifysig+0x13/0x19
>  [<c0330000>] rpc_info_open+0x17/0x6a
>  =======================
> Code: 8b 46 40 8b 50 08 b8 05 8f 39 c0 e8 08 df fe ff 8b 46 48 85 c0 74 14 8b
> 40 10 85 c0 74 0d 8b 50 2c b8 23 8f 39 c0 e8 ed de fe ff <0f> 0b eb fe 8b 53
> 10 8b 03 83 e2 01 f7 da c1 e8 1e 83 c2 04 69 
> EIP: [<c01443f1>] page_remove_rmap+0xe4/0x111 SS:ESP 0068:eefc7e00
> ---[ end trace 42d12388f65d0f6f ]---
> Fixing recursive fault but reboot is needed!
> 
> Apparently this happened to me in the near past, but I didn't have any
> netconsole facility enabled at that time to capture the message.
> 
> Anybody has any idea where this might have come from?
> 
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