Date:	Sat, 15 Sep 2007 12:22:15 +0200
From:	Soeren Sonnenburg <kernel@....de>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	linux-fsdevel@...r.kernel.org,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.22.6: kernel BUG at fs/locks.c:171

On Sat, 2007-09-15 at 09:47 +0000, Soeren Sonnenburg wrote:
> On Fri, 2007-09-14 at 07:22 +1000, Nick Piggin wrote:
> > On Friday 14 September 2007 16:02, Soeren Sonnenburg wrote:
> > > On Thu, 2007-09-13 at 09:51 +1000, Nick Piggin wrote:
> > > > On Thursday 13 September 2007 19:20, Soeren Sonnenburg wrote:
> > > > > Dear all,
> > > > >
> > > > > I've just seen this in dmesg on a AMD K7 / kernel 2.6.22.6 machine
> > > > > (config attached).
> > > > >
> > > > > Any ideas / which further information needed ?
> > > >
> > > > Thanks for the report. Is it reproduceable? It seems like the
> > > > locks_free_lock call that's oopsing is coming from __posix_lock_file.
> > > > The actual function looks fine, but the lock being freed could have
> > > > been corrupted if there was slab corruption, or a hardware corruption.
> > > >
> > > > You could: try running memtest86+ overnight. And try the following
> > > > patch and turn on slab debugging then try to reproduce the problem.
> > >
> > > OK so far I've run memtest86+ 1.40 from freedos for 8 hrs (v1.70 hung on
> > > startup) - nothing.
> > 
> > Thanks.
> > 
> > > Could this corruption be caused by a pci card/driver? I am asking as I
> > > am using a new dvb-t card (asus p7131) and the oops happened after 5 or
> > > 6 days of uptime just about a day after watching some movie (very bad
> > > reception/lots of errors).
> > 
> > It could be caused by that, definitely. slab debugging plus my earlier
> > patch may help to narrow it down. (or stress testing with / without the
> > dvb card in action).
> > 
> > 
> > > However this machine used to have uptimes of months before the dvb card
> > > was in there and the kernel version upgrade (don't know which version
> > > that was...).
> > >
> > > Anyway I am not sure if this is reproducible, but I will keep memtest
> > > running today and then proceed as you said...
> > 
> > OK. Don't put too much effort into memtest if it hasn't caught anything
> > by now -- it's really only exercising your CPU and memory, so even if it
> > is your video hardware, it probably won't find the problem.
> 
> Memtest did not find anything after 16 passes so I finally stopped it
> applied your patch and used
> 
> CONFIG_DEBUG_SLAB=y
> CONFIG_DEBUG_SLAB_LEAK=y
> 
> and booted into the new kernel.
> 
> A few hours later the machine hung (due to nmi watchdog rebooted), so I
> restarted and disabled the watchdog and while compiling a kernel with a
> ``more minimal'' config I got this (not sure whether this is related/the
> cause .../ note that I don't use a swapfile/partition).
> 
> I would need more guidance on what to try now...
> 
> Thanks!
> Soeren
> 
> swap_dup: Bad swap file entry 28c8af9d
> VM: killing process cc1
> Eeek! page_mapcount(page) went negative! (-1)
>   page pfn = 36233
>   page->flags = 40000834
>   page->count = 2
>   page->mapping = c1cfed14
>   vma->vm_ops = run_init_process+0x3feff000/0x14
> ------------[ cut here ]------------
> kernel BUG at mm/rmap.c:628!
> invalid opcode: 0000 [#1]
> Modules linked in: ipt_iprange ipt_REDIRECT capi kernelcapi capifs ipt_REJECT xt_tcpudp xt_state xt_limit ipt_LOG ipt_MASQUERADE iptable_mangle iptable_nat nf_conntrack_ipv4 iptable_filter ip_tables x_tables b44 ohci1394 ieee1394 nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack lcd tda827x saa7134_dvb dvb_pll video_buf_dvb tda1004x tuner ves1820 usb_storage usblp budget_ci budget_core saa7134 compat_ioctl32 dvb_ttpci dvb_core saa7146_vv video_buf saa7146 ttpci_eeprom ir_kbd_i2c videodev v4l2_common v4l1_compat ir_common via_agp agpgart
> CPU:    0
> EIP:    0060:[<c0144487>]    Not tainted VLI
> EFLAGS: 00010246   (2.6.22.6 #2)
> EIP is at page_remove_rmap+0xd4/0x101
> eax: 00000000   ebx: c16c4660   ecx: 00000000   edx: 00000000
> esi: d4570b30   edi: d6560a78   ebp: b7400000   esp: d6265eac
> ds: 007b   es: 007b   fs: 0000  gs: 0000  ss: 0068
> Process cc1 (pid: 26095, ti=d6264000 task=d67af5b0 task.ti=d6264000)
> Stack: c0422e26 c1cfed14 c16c4660 b729e000 c013f5b8 36233cce 00000000 d4570b30 
>        d6265f20 00000000 00000001 f4ffcb70 f483a3b8 c04f44b8 00000000 ffffffff 
>        f4ffcb70 00303ff4 b7c18000 00000000 d6265f20 f4a8c510 f483a3b8 00000009 
> Call Trace:
>  [<c013f5b8>] unmap_vmas+0x23f/0x404
>  [<c0141c09>] exit_mmap+0x5f/0xc9
>  [<c011923a>] mmput+0x1b/0x5e
>  [<c011cf97>] do_exit+0x1a0/0x606
>  [<c01135f8>] do_page_fault+0x49c/0x518
>  [<c011e340>] __do_softirq+0x35/0x75
>  [<c011315c>] do_page_fault+0x0/0x518
>  [<c039aada>] error_code+0x6a/0x70
>  =======================
> Code: c0 74 0d 8b 50 08 b8 56 2e 42 c0 e8 ac f4 fe ff 8b 46 48 85 c0 74 14 8b 40 10 85 c0 74 0d 8b 50 2c b8 75 2e 42 c0 e8 91 f4 fe ff <0f> 0b eb fe 8b 53 10 8b 03 83 e2 01 c1 e8 1e f7 da 83 c2 04 69 
> EIP: [<c0144487>] page_remove_rmap+0xd4/0x101 SS:ESP 0068:d6265eac
> Fixing recursive fault but reboot is needed!

Hmmhh, so now I rebooted and again tried to

$ make 

the new kernel which again triggered this(?) BUG:

Any ideas?
Soeren.

Eeek! page_mapcount(page) went negative! (-1)
  page pfn = 18722
  page->flags = 40000000
  page->count = 1
  page->mapping = 00000000
  vma->vm_ops = run_init_process+0x3feff000/0x14
------------[ cut here ]------------
kernel BUG at mm/rmap.c:628!
invalid opcode: 0000 [#1]
Modules linked in: ipt_iprange ipt_REDIRECT capi kernelcapi capifs ipt_REJECT xt_tcpudp xt_state xt_limit ipt_LOG ipt_MASQUERADE iptable_mangle iptable_nat nf_conntrack_ipv4 iptable_filter ip_tables x_t
CPU:    0
EIP:    0060:[<c0144487>]    Not tainted VLI
EFLAGS: 00010246   (2.6.22.6 #2)
EIP is at page_remove_rmap+0xd4/0x101
eax: 00000000   ebx: c130e440   ecx: 00000000   edx: 00000000
esi: f438b510   edi: f3328ac8   ebp: c130e440   esp: f28d5eec
ds: 007b   es: 007b   fs: 0000  gs: 0033  ss: 0068
Process cc1 (pid: 17957, ti=f28d4000 task=f60bb0d0 task.ti=f28d4000)
Stack: c0422e26 00000000 f3328ac8 00000002 c013f185 b76b2000 f438b510 f43013b8 
       c1a7c640 18722229 b76b2000 f3328ac8 f438b510 c014021d f3328ac8 f4360b74 
       f43013f8 18722229 00100073 b76b2000 f43013b8 f4360b74 00000100 f28d5f90 
Call Trace:
 [<c013f185>] do_wp_page+0x28a/0x35c
 [<c014021d>] __handle_mm_fault+0x626/0x6a4
 [<c0113368>] do_page_fault+0x20c/0x518
 [<c011315c>] do_page_fault+0x0/0x518
 [<c039aada>] error_code+0x6a/0x70
 =======================
Code: c0 74 0d 8b 50 08 b8 56 2e 42 c0 e8 ac f4 fe ff 8b 46 48 85 c0 74 14 8b 40 10 85 c0 74 0d 8b 50 2c b8 75 2e 42 c0 e8 91 f4 fe ff <0f> 0b eb fe 8b 53 10 8b 03 83 e2 01 c1 e8 1e f7 da 83 c2 04 69 
EIP: [<c0144487>] page_remove_rmap+0xd4/0x101 SS:ESP 0068:f28d5eec
Eeek! page_mapcount(page) went negative! (-2)
  page pfn = 18722
  page->flags = 40000004
  page->count = 1
  page->mapping = 00000000
  vma->vm_ops = run_init_process+0x3feff000/0x14
------------[ cut here ]------------
kernel BUG at mm/rmap.c:628!
invalid opcode: 0000 [#2]
Modules linked in: ipt_iprange ipt_REDIRECT capi kernelcapi capifs ipt_REJECT xt_tcpudp xt_state xt_limit ipt_LOG ipt_MASQUERADE iptable_mangle iptable_nat nf_conntrack_ipv4 iptable_filter ip_tables x_t
CPU:    0
EIP:    0060:[<c0144487>]    Not tainted VLI
EFLAGS: 00010246   (2.6.22.6 #2)
EIP is at page_remove_rmap+0xd4/0x101
eax: 00000000   ebx: c130e440   ecx: 00000000   edx: 00000000
esi: f438b510   edi: f3328ac8   ebp: b7800000   esp: f28d5d30
ds: 007b   es: 007b   fs: 0000  gs: 0000  ss: 0068
Process cc1 (pid: 17957, ti=f28d4000 task=f60bb0d0 task.ti=f28d4000)
Stack: c0422e26 00000000 c130e440 b76b2000 c013f5b8 18722229 00000000 f438b510 
       f28d5da4 00000000 00000001 f4360b74 f43013b8 c04f44b8 00000000 ffffffff 
       f4360b74 00173c7a b7c03000 00000000 f28d5da4 f6754cf0 f43013b8 0000000b 
Call Trace:
 [<c013f5b8>] unmap_vmas+0x23f/0x404
 [<c0141c09>] exit_mmap+0x5f/0xc9
 [<c011923a>] mmput+0x1b/0x5e
 [<c011cf97>] do_exit+0x1a0/0x606
 [<c0104db5>] die+0x188/0x190
 [<c0105123>] do_invalid_op+0x0/0x8a
 [<c01051a4>] do_invalid_op+0x81/0x8a
 [<c0144487>] page_remove_rmap+0xd4/0x101
 [<c011ae03>] wake_up_klogd+0x33/0x35
 [<c01066e5>] timer_interrupt+0x1d/0x23
 [<c013445c>] handle_IRQ_event+0x1a/0x3f
 [<c039aada>] error_code+0x6a/0x70
 [<c0144487>] page_remove_rmap+0xd4/0x101
 [<c013f185>] do_wp_page+0x28a/0x35c
 [<c014021d>] __handle_mm_fault+0x626/0x6a4
 [<c0113368>] do_page_fault+0x20c/0x518
 [<c011315c>] do_page_fault+0x0/0x518
 [<c039aada>] error_code+0x6a/0x70
 =======================
Code: c0 74 0d 8b 50 08 b8 56 2e 42 c0 e8 ac f4 fe ff 8b 46 48 85 c0 74 14 8b 40 10 85 c0 74 0d 8b 50 2c b8 75 2e 42 c0 e8 91 f4 fe ff <0f> 0b eb fe 8b 53 10 8b 03 83 e2 01 c1 e8 1e f7 da 83 c2 04 69 
EIP: [<c0144487>] page_remove_rmap+0xd4/0x101 SS:ESP 0068:f28d5d30
Fixing recursive fault but reboot is needed!
-- 
Sometimes, there's a moment as you're waking, when you become aware of
the real world around you, but you're still dreaming.
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