* kernel BUG at drivers/xen/blkback/blkback-pagemap.c:65!
@ 2009-07-16 16:19 Christopher S. Aker
2009-07-16 17:01 ` Keir Fraser
0 siblings, 1 reply; 3+ messages in thread
From: Christopher S. Aker @ 2009-07-16 16:19 UTC (permalink / raw)
To: xen devel
Xen 3.3-testing @ changeset 18651, 64bit
dom0 2.6.18.8 @ changeset 888, PAE
Files: http://theshore.net/~caker/xen/BUGS/1.22/
clearing empty pagemap 311
------------[ cut here ]------------
kernel BUG at drivers/xen/blkback/blkback-pagemap.c:65!
invalid opcode: 0000 [#1]
SMP
Modules linked in: e1000e e1000
CPU: 0
EIP: 0061:[<c0390507>] Not tainted VLI
EFLAGS: 00010292 (2.6.18.8-888-1 #1)
EIP is at blkback_pagemap_clear+0x57/0xa0
eax: 0000001e ebx: 00000137 ecx: 00000000 edx: fdb4e000
esi: d24f4ea0 edi: c0691a14 ebp: d24f4e94 esp: cdc0fbd4
ds: 007b es: 007b ss: 0069
Process blkback.166.xvd (pid: 30401, ti=cdc0e000 task=cb028570
task.ti=cdc0e000)
Stack: c05441a0 00000137 00000003 d23463f0 00000002 0000023e c038e00d
cdc0fbf8
00000135 d2b65000 00000000 00000000 00000000 00000010 00000000
d2b66000
00000000 00000000 00000000 0000037b 00003b18 00005617 00000000
00000000
Call Trace:
[<c038e00d>] fast_flush_area+0xad/0x130
[<c0439774>] dm_request+0xc4/0xf0
[<c02eda83>] generic_make_request+0x173/0x210
[<c03841ca>] evtchn_do_upcall+0x10a/0x200
[<c02edb89>] submit_bio+0x69/0x120
[<c0174217>] bio_add_page+0x37/0x50
[<c038e58d>] dispatch_rw_block_io+0x1fd/0x730
[<c04fcd4c>] schedule+0x33c/0xa00
[<c02ea84a>] elv_next_request+0x12a/0x220
[<c02ef133>] __generic_unplug_device+0x33/0x40
[<c02ef5e5>] generic_unplug_device+0x15/0x50
[<c043a07a>] dm_table_unplug_all+0x2a/0x40
[<c038eb73>] blkif_schedule+0xb3/0x620
[<c04fcd4c>] schedule+0x33c/0xa00
[<c038eac0>] blkif_schedule+0x0/0x620
[<c0136b62>] kthread+0xc2/0x100
[<c0136aa0>] kthread+0x0/0x100
[<c0102c45>] kernel_thread_helper+0x5/0x10
Code: 1a 69 c0 7d 4d 8d 04 5b bf 08 1a 69 c0 8d 2c 82 b9 0c 00 00 00 89
ee f3 a6 75 18 89 5c 24 04 c7 04 24 a0 41 54 c0 e8 f9 13 d9 ff <0f> 0b
41 00 50 65 55 c0 b9 03 00 00 00 89 ef 31 c0 f3 ab 8b 5c
EIP: [<c0390507>] blkback_pagemap_clear+0x57/0xa0 SS:ESP 0069:cdc0fbd4
-Chris
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: kernel BUG at drivers/xen/blkback/blkback-pagemap.c:65!
2009-07-16 16:19 kernel BUG at drivers/xen/blkback/blkback-pagemap.c:65! Christopher S. Aker
@ 2009-07-16 17:01 ` Keir Fraser
2009-07-16 23:28 ` jake wires
0 siblings, 1 reply; 3+ messages in thread
From: Keir Fraser @ 2009-07-16 17:01 UTC (permalink / raw)
To: Christopher S. Aker, xen devel; +Cc: Dutch Meyer, jake.wires
I suggest you stick with the xen-3.4.0 tag in linux-2.6.18-xen.hg and see if
that serves you better. This particular bug may have been introduced by the
blktap2 additions (at least the BUG() is in a file which that patch
introduces). Cc'ed the blktap2 guys.
-- Keir
On 16/07/2009 17:19, "Christopher S. Aker" <caker@theshore.net> wrote:
> Xen 3.3-testing @ changeset 18651, 64bit
> dom0 2.6.18.8 @ changeset 888, PAE
>
> Files: http://theshore.net/~caker/xen/BUGS/1.22/
>
> clearing empty pagemap 311
> ------------[ cut here ]------------
> kernel BUG at drivers/xen/blkback/blkback-pagemap.c:65!
> invalid opcode: 0000 [#1]
> SMP
> Modules linked in: e1000e e1000
> CPU: 0
> EIP: 0061:[<c0390507>] Not tainted VLI
> EFLAGS: 00010292 (2.6.18.8-888-1 #1)
> EIP is at blkback_pagemap_clear+0x57/0xa0
> eax: 0000001e ebx: 00000137 ecx: 00000000 edx: fdb4e000
> esi: d24f4ea0 edi: c0691a14 ebp: d24f4e94 esp: cdc0fbd4
> ds: 007b es: 007b ss: 0069
> Process blkback.166.xvd (pid: 30401, ti=cdc0e000 task=cb028570
> task.ti=cdc0e000)
> Stack: c05441a0 00000137 00000003 d23463f0 00000002 0000023e c038e00d
> cdc0fbf8
> 00000135 d2b65000 00000000 00000000 00000000 00000010 00000000
> d2b66000
> 00000000 00000000 00000000 0000037b 00003b18 00005617 00000000
> 00000000
> Call Trace:
> [<c038e00d>] fast_flush_area+0xad/0x130
> [<c0439774>] dm_request+0xc4/0xf0
> [<c02eda83>] generic_make_request+0x173/0x210
> [<c03841ca>] evtchn_do_upcall+0x10a/0x200
> [<c02edb89>] submit_bio+0x69/0x120
> [<c0174217>] bio_add_page+0x37/0x50
> [<c038e58d>] dispatch_rw_block_io+0x1fd/0x730
> [<c04fcd4c>] schedule+0x33c/0xa00
> [<c02ea84a>] elv_next_request+0x12a/0x220
> [<c02ef133>] __generic_unplug_device+0x33/0x40
> [<c02ef5e5>] generic_unplug_device+0x15/0x50
> [<c043a07a>] dm_table_unplug_all+0x2a/0x40
> [<c038eb73>] blkif_schedule+0xb3/0x620
> [<c04fcd4c>] schedule+0x33c/0xa00
> [<c038eac0>] blkif_schedule+0x0/0x620
> [<c0136b62>] kthread+0xc2/0x100
> [<c0136aa0>] kthread+0x0/0x100
> [<c0102c45>] kernel_thread_helper+0x5/0x10
> Code: 1a 69 c0 7d 4d 8d 04 5b bf 08 1a 69 c0 8d 2c 82 b9 0c 00 00 00 89
> ee f3 a6 75 18 89 5c 24 04 c7 04 24 a0 41 54 c0 e8 f9 13 d9 ff <0f> 0b
> 41 00 50 65 55 c0 b9 03 00 00 00 89 ef 31 c0 f3 ab 8b 5c
> EIP: [<c0390507>] blkback_pagemap_clear+0x57/0xa0 SS:ESP 0069:cdc0fbd4
>
> -Chris
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: kernel BUG at drivers/xen/blkback/blkback-pagemap.c:65!
2009-07-16 17:01 ` Keir Fraser
@ 2009-07-16 23:28 ` jake wires
0 siblings, 0 replies; 3+ messages in thread
From: jake wires @ 2009-07-16 23:28 UTC (permalink / raw)
To: Keir Fraser; +Cc: Dutch Meyer, xen devel, jake.wires
[-- Attachment #1.1: Type: text/plain, Size: 3208 bytes --]
the attached patch fixes one possible code path to the failed assertion, but
it's not clear from the stack trace that this path was actually taken. were
there any interesting errors in the dom0 logs?
Signed-off-by: Jake Wires <jake.wires@citrix.com>
On Thu, Jul 16, 2009 at 10:01 AM, Keir Fraser <keir.fraser@eu.citrix.com>wrote:
> I suggest you stick with the xen-3.4.0 tag in linux-2.6.18-xen.hg and see
> if
> that serves you better. This particular bug may have been introduced by the
> blktap2 additions (at least the BUG() is in a file which that patch
> introduces). Cc'ed the blktap2 guys.
>
> -- Keir
>
> On 16/07/2009 17:19, "Christopher S. Aker" <caker@theshore.net> wrote:
>
> > Xen 3.3-testing @ changeset 18651, 64bit
> > dom0 2.6.18.8 @ changeset 888, PAE
> >
> > Files: http://theshore.net/~caker/xen/BUGS/1.22/<http://theshore.net/%7Ecaker/xen/BUGS/1.22/>
> >
> > clearing empty pagemap 311
> > ------------[ cut here ]------------
> > kernel BUG at drivers/xen/blkback/blkback-pagemap.c:65!
> > invalid opcode: 0000 [#1]
> > SMP
> > Modules linked in: e1000e e1000
> > CPU: 0
> > EIP: 0061:[<c0390507>] Not tainted VLI
> > EFLAGS: 00010292 (2.6.18.8-888-1 #1)
> > EIP is at blkback_pagemap_clear+0x57/0xa0
> > eax: 0000001e ebx: 00000137 ecx: 00000000 edx: fdb4e000
> > esi: d24f4ea0 edi: c0691a14 ebp: d24f4e94 esp: cdc0fbd4
> > ds: 007b es: 007b ss: 0069
> > Process blkback.166.xvd (pid: 30401, ti=cdc0e000 task=cb028570
> > task.ti=cdc0e000)
> > Stack: c05441a0 00000137 00000003 d23463f0 00000002 0000023e c038e00d
> > cdc0fbf8
> > 00000135 d2b65000 00000000 00000000 00000000 00000010 00000000
> > d2b66000
> > 00000000 00000000 00000000 0000037b 00003b18 00005617 00000000
> > 00000000
> > Call Trace:
> > [<c038e00d>] fast_flush_area+0xad/0x130
> > [<c0439774>] dm_request+0xc4/0xf0
> > [<c02eda83>] generic_make_request+0x173/0x210
> > [<c03841ca>] evtchn_do_upcall+0x10a/0x200
> > [<c02edb89>] submit_bio+0x69/0x120
> > [<c0174217>] bio_add_page+0x37/0x50
> > [<c038e58d>] dispatch_rw_block_io+0x1fd/0x730
> > [<c04fcd4c>] schedule+0x33c/0xa00
> > [<c02ea84a>] elv_next_request+0x12a/0x220
> > [<c02ef133>] __generic_unplug_device+0x33/0x40
> > [<c02ef5e5>] generic_unplug_device+0x15/0x50
> > [<c043a07a>] dm_table_unplug_all+0x2a/0x40
> > [<c038eb73>] blkif_schedule+0xb3/0x620
> > [<c04fcd4c>] schedule+0x33c/0xa00
> > [<c038eac0>] blkif_schedule+0x0/0x620
> > [<c0136b62>] kthread+0xc2/0x100
> > [<c0136aa0>] kthread+0x0/0x100
> > [<c0102c45>] kernel_thread_helper+0x5/0x10
> > Code: 1a 69 c0 7d 4d 8d 04 5b bf 08 1a 69 c0 8d 2c 82 b9 0c 00 00 00 89
> > ee f3 a6 75 18 89 5c 24 04 c7 04 24 a0 41 54 c0 e8 f9 13 d9 ff <0f> 0b
> > 41 00 50 65 55 c0 b9 03 00 00 00 89 ef 31 c0 f3 ab 8b 5c
> > EIP: [<c0390507>] blkback_pagemap_clear+0x57/0xa0 SS:ESP 0069:cdc0fbd4
> >
> > -Chris
> >
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@lists.xensource.com
> > http://lists.xensource.com/xen-devel
>
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
>
[-- Attachment #1.2: Type: text/html, Size: 4528 bytes --]
[-- Attachment #2: blkback-set-pagemap.diff --]
[-- Type: text/x-diff, Size: 887 bytes --]
diff -r b420e936c022 drivers/xen/blkback/blkback.c
--- a/drivers/xen/blkback/blkback.c Wed Jul 15 09:10:37 2009 +0100
+++ b/drivers/xen/blkback/blkback.c Thu Jul 16 16:27:16 2009 -0700
@@ -453,6 +453,11 @@
DPRINTK("invalid buffer -- could not remap it\n");
map[i].handle = BLKBACK_INVALID_HANDLE;
ret |= 1;
+ } else {
+ blkback_pagemap_set(vaddr_pagenr(pending_req, i),
+ virt_to_page(vaddr(pending_req, i)),
+ blkif->domid, req->handle,
+ req->seg[i].gref);
}
pending_handle(pending_req, i) = map[i].handle;
@@ -465,10 +470,6 @@
FOREIGN_FRAME(map[i].dev_bus_addr >> PAGE_SHIFT));
seg[i].buf = map[i].dev_bus_addr |
(req->seg[i].first_sect << 9);
- blkback_pagemap_set(vaddr_pagenr(pending_req, i),
- virt_to_page(vaddr(pending_req, i)),
- blkif->domid, req->handle,
- req->seg[i].gref);
}
if (ret)
[-- Attachment #3: Type: text/plain, Size: 138 bytes --]
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel
^ permalink raw reply [flat|nested] 3+ messages in thread
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2009-07-16 16:19 kernel BUG at drivers/xen/blkback/blkback-pagemap.c:65! Christopher S. Aker
2009-07-16 17:01 ` Keir Fraser
2009-07-16 23:28 ` jake wires
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