On Sat, 2002-11-09 at 04:06, Heinz J . Mauelshagen wrote:
> On Thu, Nov 07, 2002 at 07:44:36PM -0800, Gregory Ade wrote:
> > Okay, I disabled high memory support (only change from production
> > kernel), rebooted with this test kernel, and tried to create a snapshot:
[snip]
> > It worked just fine:
[snip]
> > So I removed it:
[snip]
> > No kernel oops or BUG in the dmesg.
> >
> > Again, the _ONLY DIFFERENCE_ between this test kernel and the production
> > kernel is the high-memory support option. On the test kernel, it is
> > off, and on the production kernel, it is set to 64GB.
> >
> > Hope this helps.
[snip]
> this proves my assumption right that something is fishy with the high
> memory support in your SMP environment.
>
> I guess that it might work as well in case you make a single processor kernel
> _with_ high memory enabled and repeat the very same test and that it might
> be a highmem/smp problem still to be fixed.
Well, it's not solely an SMP thing. I finally got an opportunity to
test a non-SMP high-memory kernel tonight, and it's the exact same
failure mode as the original problem report. Here's a full report,
complete with the Oops and a run through ksymoops.
root@burpr(pts/0):~ 24 # uname -a
Linux burpr 2.4.19-2.burpr.test #1 Thu Dec 5 16:22:49 PST 2002 i686 unknown
root@burpr(pts/0):~ 25 # cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 1
model name : Intel(R) Xeon(TM) CPU 1.60GHz
stepping : 1
cpu MHz : 1595.176
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm
bogomips : 3185.04
root@burpr(pts/0):~ 26 # free -tm
total used free shared buffers cached
Mem: 7580 132 7448 0 46 28
-/+ buffers/cache: 57 7523
Swap: 8191 0 8191
Total: 15772 132 15640
root@burpr(pts/0):~ 27 # lvcreate --snapshot --extents 512 --name tmp_snap /dev/vg00/tmp
lvcreate -- INFO: using default snapshot chunk size of 64 KB for "/dev/vg00/tmp_snap"
Segmentation fault
--->8--[ Oops output taken from dmesg ]-->8---
kernel BUG at vmalloc.c:236!
invalid operand: 0000
CPU: 0
EIP: 0010:[<c012caa6>] Not tainted
EFLAGS: 00010246
eax: ffffffff ebx: 00000000 ecx: 51eb851f edx: 00000000
esi: 00000000 edi: f4f51a00 ebp: fffffff4 esp: f3ce9d20
ds: 0018 es: 0018 ss: 0018
Process lvcreate (pid: 740, stackpage=f3ce9000)
Stack: 00000000 00000000 f4f51a00 fffffff4 000001f0 f930f000 00000001 fffffff4
c02eab14 c02eac7c 000001f0 00000001 c023ad1b 00000000 000001f2 00000163
f4f51b6c 00000000 f4f51a00 f3ce9df8 c023adc8 f4f51a00 f4f51a00 000bd000
Call Trace: [<c023ad1b>] [<c023adc8>] [<c0238870>] [<c023614c>] [<c01dad7f>]
[<c01419f7>] [<c010867b>]
Code: 0f 0b ec 00 20 cb 29 c0 31 c0 e9 bf 01 00 00 6a 02 53 e8 9f
--->8--[ Oops output taken from dmesg ]-->8---
--->8--[ Oops output from ksymoops ]-->8---
ksymoops 2.4.1 on i686 2.4.19-2.burpr.test. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.19-2.burpr.test/ (default)
-m /boot/System.map-2.4.19-2.burpr.test (default)
Warning: You did not tell me where to find symbol information. I will
assume that the log matches the kernel and modules that are running
right now and I'll use the default options above for symbol resolution.
If the current kernel and/or modules do not match the log, you can get
more accurate output by telling me the kernel version and where to find
map, modules, ksyms etc. ksymoops -h explains the options.
Warning (compare_maps): mismatch on symbol usb_devfs_handle , usbcore says f922a6f4, /lib/modules/2.4.19-2.burpr.test/kernel/drivers/usb/usbcore.o says f922a1b4. Ignoring /lib/modules/2.4.19-2.burpr.test/kernel/drivers/usb/usbcore.o entry
Warning (compare_maps): mismatch on symbol icmpv6_socket , ipv6 says f921ac80, /lib/modules/2.4.19-2.burpr.test/kernel/net/ipv6/ipv6.o says f9218960. Ignoring /lib/modules/2.4.19-2.burpr.test/kernel/net/ipv6/ipv6.o entry
Warning (compare_maps): mismatch on symbol icmpv6_statistics , ipv6 says f921ab80, /lib/modules/2.4.19-2.burpr.test/kernel/net/ipv6/ipv6.o says f9218860. Ignoring /lib/modules/2.4.19-2.burpr.test/kernel/net/ipv6/ipv6.o entry
Warning (compare_maps): mismatch on symbol inet6_dev_count , ipv6 says f921a7a0, /lib/modules/2.4.19-2.burpr.test/kernel/net/ipv6/ipv6.o says f9218480. Ignoring /lib/modules/2.4.19-2.burpr.test/kernel/net/ipv6/ipv6.o entry
Warning (compare_maps): mismatch on symbol inet6_ifa_count , ipv6 says f921a7a4, /lib/modules/2.4.19-2.burpr.test/kernel/net/ipv6/ipv6.o says f9218484. Ignoring /lib/modules/2.4.19-2.burpr.test/kernel/net/ipv6/ipv6.o entry
Warning (compare_maps): mismatch on symbol inet6_protos , ipv6 says f921ab00, /lib/modules/2.4.19-2.burpr.test/kernel/net/ipv6/ipv6.o says f92187e0. Ignoring /lib/modules/2.4.19-2.burpr.test/kernel/net/ipv6/ipv6.o entry
Warning (compare_maps): mismatch on symbol inetsw6 , ipv6 says f921a740, /lib/modules/2.4.19-2.burpr.test/kernel/net/ipv6/ipv6.o says f9218420. Ignoring /lib/modules/2.4.19-2.burpr.test/kernel/net/ipv6/ipv6.o entry
Warning (compare_maps): mismatch on symbol ip6_ra_chain , ipv6 says f921aa00, /lib/modules/2.4.19-2.burpr.test/kernel/net/ipv6/ipv6.o says f92186e0. Ignoring /lib/modules/2.4.19-2.burpr.test/kernel/net/ipv6/ipv6.o entry
Warning (compare_maps): mismatch on symbol ipv6_statistics , ipv6 says f921a940, /lib/modules/2.4.19-2.burpr.test/kernel/net/ipv6/ipv6.o says f9218620. Ignoring /lib/modules/2.4.19-2.burpr.test/kernel/net/ipv6/ipv6.o entry
Warning (compare_maps): mismatch on symbol raw_v6_htable , ipv6 says f921aa80, /lib/modules/2.4.19-2.burpr.test/kernel/net/ipv6/ipv6.o says f9218760. Ignoring /lib/modules/2.4.19-2.burpr.test/kernel/net/ipv6/ipv6.o entry
Warning (compare_maps): mismatch on symbol rt6_stats , ipv6 says f921a908, /lib/modules/2.4.19-2.burpr.test/kernel/net/ipv6/ipv6.o says f92185e8. Ignoring /lib/modules/2.4.19-2.burpr.test/kernel/net/ipv6/ipv6.o entry
Warning (compare_maps): mismatch on symbol udp_stats_in6 , ipv6 says f921aa40, /lib/modules/2.4.19-2.burpr.test/kernel/net/ipv6/ipv6.o says f9218720. Ignoring /lib/modules/2.4.19-2.burpr.test/kernel/net/ipv6/ipv6.o entry
LAPIC_NMI (acpi_id[0x0007] polarity[0x1] trigger[0x1] lint[0x1])
LAPIC_NMI (acpi_id[0x0008] polarity[0x1] trigger[0x1] lint[0x1])
cpu: 0, clocks: 996964, slice: 498482
kernel BUG at vmalloc.c:236!
invalid operand: 0000
CPU: 0
EIP: 0010:[<c012caa6>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010246
eax: ffffffff ebx: 00000000 ecx: 51eb851f edx: 00000000
esi: 00000000 edi: f4f51a00 ebp: fffffff4 esp: f3ce9d20
ds: 0018 es: 0018 ss: 0018
Process lvcreate (pid: 740, stackpage=f3ce9000)
Stack: 00000000 00000000 f4f51a00 fffffff4 000001f0 f930f000 00000001 fffffff4
c02eab14 c02eac7c 000001f0 00000001 c023ad1b 00000000 000001f2 00000163
f4f51b6c 00000000 f4f51a00 f3ce9df8 c023adc8 f4f51a00 f4f51a00 000bd000
Call Trace: [<c023ad1b>] [<c023adc8>] [<c0238870>] [<c023614c>] [<c01dad7f>]
[<c01419f7>] [<c010867b>]
Code: 0f 0b ec 00 20 cb 29 c0 31 c0 e9 bf 01 00 00 6a 02 53 e8 9f
>>EIP; c012caa6 <__vmalloc+26/1fc> <=====
Trace; c023ad1b <lvm_snapshot_alloc_hash_table+3f/80>
Trace; c023adc8 <lvm_snapshot_alloc+6c/e0>
Trace; c0238870 <lvm_do_lv_create+518/868>
Trace; c023614c <lvm_chr_ioctl+710/81c>
Trace; c01dad7f <locate_hd_struct+27/70>
Trace; c01419f7 <sys_ioctl+16b/184>
Trace; c010867b <system_call+33/38>
Code; c012caa6 <__vmalloc+26/1fc>
00000000 <_EIP>:
Code; c012caa6 <__vmalloc+26/1fc> <=====
0: 0f 0b ud2a <=====
Code; c012caa8 <__vmalloc+28/1fc>
2: ec in (%dx),%al
Code; c012caa9 <__vmalloc+29/1fc>
3: 00 20 add %ah,(%eax)
Code; c012caab <__vmalloc+2b/1fc>
5: cb lret
Code; c012caac <__vmalloc+2c/1fc>
6: 29 c0 sub %eax,%eax
Code; c012caae <__vmalloc+2e/1fc>
8: 31 c0 xor %eax,%eax
Code; c012cab0 <__vmalloc+30/1fc>
a: e9 bf 01 00 00 jmp 1ce <_EIP+0x1ce> c012cc74 <__vmalloc+1f4/1fc>
Code; c012cab5 <__vmalloc+35/1fc>
f: 6a 02 push $0x2
Code; c012cab7 <__vmalloc+37/1fc>
11: 53 push %ebx
Code; c012cab8 <__vmalloc+38/1fc>
12: e8 9f 00 00 00 call b6 <_EIP+0xb6> c012cb5c <__vmalloc+dc/1fc>
13 warnings issued. Results may not be reliable.
--->8--[ Oops output from ksymoops ]-->8---
--
Gregory K. Ade <gkade@bigbrother.net>
http://bigbrother.net/~gkade
OpenPGP Key ID: EAF4844B keyserver: pgpkeys.mit.edu
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