Gregory, as Jon already thought, this seems to be a flaw in the VM subsystem. The ksymoops you provided shows that, because it fails in vmalloc when lvm_snapshot_alloc_hash_table() tries to allocated virtual memory for the copy-on-write exeception table it needs to track the changes which happen to the original logical volume. Is there any chance to prove that by running the system with less than 2GB of memory and _without_ high memory support for a test run? Regards, Heinz -- The LVM Guy -- On Mon, Oct 28, 2002 at 08:37:52PM -0800, Gregory K. Ade wrote: > On Mon, 2002-10-28 at 01:17, Heinz J . Mauelshagen wrote: > > > Run the kernel oops you probably got for "lvcreate --snapshot ..." through > > ksymoops, please. > > Okay, just for consistency's sake, I ran: > > --->8--[Cut Here]-->8--- > root@burpr(pts/24):/ 36 # lvdisplay /dev/vg00/tmp > --- Logical volume --- > LV Name /dev/vg00/tmp > VG Name vg00 > LV Write Access read/write > LV Status available > LV # 2 > # open 1 > LV Size 2 GB > Current LE 512 > Allocated LE 512 > Allocation next free > Read ahead sectors 120 > Block device 58:1 > > > root@burpr(pts/24):/ 37 # 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 > root@burpr(pts/24):/ 38 # > --->8--[Cut Here]-->8--- > > That gave me an oops. pulling it from dmesg and sticking it into a > file, I ran ksymoops, and here's the output in all it's hairy glory: > > --->8--[Cut Here]-->8--- > ksymoops 2.4.1 on i686 2.4.19-2.burpr. Options used > -V (default) > -k /proc/ksyms (default) > -l /proc/modules (default) > -o /lib/modules/2.4.19-2.burpr/ (default) > -m /boot/System.map-2.4.19-2.burpr (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 f9233274, /lib/modules/2.4.19-2.burpr/kernel/drivers/usb/usbcore.o says f9232d34. Ignoring /lib/modules/2.4.19-2.burpr/kernel/drivers/usb/usbcore.o entry > Warning (compare_maps): mismatch on symbol icmpv6_socket , ipv6 says f92232e0, /lib/modules/2.4.19-2.burpr/kernel/net/ipv6/ipv6.o says f9220420. Ignoring /lib/modules/2.4.19-2.burpr/kernel/net/ipv6/ipv6.o entry > Warning (compare_maps): mismatch on symbol icmpv6_statistics , ipv6 says f92212e0, /lib/modules/2.4.19-2.burpr/kernel/net/ipv6/ipv6.o says f921e420. Ignoring /lib/modules/2.4.19-2.burpr/kernel/net/ipv6/ipv6.o entry > Warning (compare_maps): mismatch on symbol inet6_dev_count , ipv6 says f921f000, /lib/modules/2.4.19-2.burpr/kernel/net/ipv6/ipv6.o says f921c140. Ignoring /lib/modules/2.4.19-2.burpr/kernel/net/ipv6/ipv6.o entry > Warning (compare_maps): mismatch on symbol inet6_ifa_count , ipv6 says f921f004, /lib/modules/2.4.19-2.burpr/kernel/net/ipv6/ipv6.o says f921c144. Ignoring /lib/modules/2.4.19-2.burpr/kernel/net/ipv6/ipv6.o entry > Warning (compare_maps): mismatch on symbol inet6_protos , ipv6 says f9221260, /lib/modules/2.4.19-2.burpr/kernel/net/ipv6/ipv6.o says f921e3a0. Ignoring /lib/modules/2.4.19-2.burpr/kernel/net/ipv6/ipv6.o entry > Warning (compare_maps): mismatch on symbol inetsw6 , ipv6 says f921efa0, /lib/modules/2.4.19-2.burpr/kernel/net/ipv6/ipv6.o says f921c0e0. Ignoring /lib/modules/2.4.19-2.burpr/kernel/net/ipv6/ipv6.o entry > Warning (compare_maps): mismatch on symbol ip6_ra_chain , ipv6 says f92209a0, /lib/modules/2.4.19-2.burpr/kernel/net/ipv6/ipv6.o says f921dae0. Ignoring /lib/modules/2.4.19-2.burpr/kernel/net/ipv6/ipv6.o entry > Warning (compare_maps): mismatch on symbol ipv6_statistics , ipv6 says f921f1a0, /lib/modules/2.4.19-2.burpr/kernel/net/ipv6/ipv6.o says f921c2e0. Ignoring /lib/modules/2.4.19-2.burpr/kernel/net/ipv6/ipv6.o entry > Warning (compare_maps): mismatch on symbol raw_v6_htable , ipv6 says f92211e0, /lib/modules/2.4.19-2.burpr/kernel/net/ipv6/ipv6.o says f921e320. Ignoring /lib/modules/2.4.19-2.burpr/kernel/net/ipv6/ipv6.o entry > Warning (compare_maps): mismatch on symbol rt6_stats , ipv6 says f921f168, /lib/modules/2.4.19-2.burpr/kernel/net/ipv6/ipv6.o says f921c2a8. Ignoring /lib/modules/2.4.19-2.burpr/kernel/net/ipv6/ipv6.o entry > Warning (compare_maps): mismatch on symbol udp_stats_in6 , ipv6 says f92209e0, /lib/modules/2.4.19-2.burpr/kernel/net/ipv6/ipv6.o says f921db20. Ignoring /lib/modules/2.4.19-2.burpr/kernel/net/ipv6/ipv6.o entry > kernel BUG at vmalloc.c:236! > invalid operand: 0000 > CPU: 2 > EIP: 0010:[<c0132082>] Not tainted > Using defaults from ksymoops -t elf32-i386 -a i386 > EFLAGS: 00010246 > eax: ffffffff ebx: 00000000 ecx: 51eb851f edx: 00000000 > esi: 00000000 edi: e6421400 ebp: fffffff4 esp: d5d7bd20 > ds: 0018 es: 0018 ss: 0018 > Process lvcreate (pid: 19229, stackpage=d5d7b000) > Stack: 00000000 00000000 e6421400 fffffff4 000001f0 f931a000 00000001 fffffff4 > c030ca14 c030cb7c 000001f0 00000001 c024cd45 00000000 000001f2 00000163 > e642156c 00000000 e6421400 d5d7bdf8 c024cdf8 e6421400 e6421400 000bd000 > Call Trace: [<c024cd45>] [<c024cdf8>] [<c024a850>] [<c02480cc>] [<c01eaaff>] > [<c014b397>] [<c01089cb>] > Code: 0f 0b ec 00 00 ae 2b c0 31 c0 e9 e4 01 00 00 6a 02 53 e8 3f > > >>EIP; c0132082 <__vmalloc+26/224> <===== > Trace; c024cd45 <lvm_snapshot_alloc_hash_table+45/8c> > Trace; c024cdf8 <lvm_snapshot_alloc+6c/e0> > Trace; c024a850 <lvm_do_lv_create+528/878> > Trace; c02480cc <lvm_chr_ioctl+71c/828> > Trace; c01eaaff <locate_hd_struct+27/70> > Trace; c014b397 <sys_ioctl+1bb/1f6> > Trace; c01089cb <system_call+33/38> > Code; c0132082 <__vmalloc+26/224> > 00000000 <_EIP>: > Code; c0132082 <__vmalloc+26/224> <===== > 0: 0f 0b ud2a <===== > Code; c0132084 <__vmalloc+28/224> > 2: ec in (%dx),%al > Code; c0132085 <__vmalloc+29/224> > 3: 00 00 add %al,(%eax) > Code; c0132087 <__vmalloc+2b/224> > 5: ae scas %es:(%edi),%al > Code; c0132088 <__vmalloc+2c/224> > 6: 2b c0 sub %eax,%eax > Code; c013208a <__vmalloc+2e/224> > 8: 31 c0 xor %eax,%eax > Code; c013208c <__vmalloc+30/224> > a: e9 e4 01 00 00 jmp 1f3 <_EIP+0x1f3> c0132275 <__vmalloc+219/224> > Code; c0132091 <__vmalloc+35/224> > f: 6a 02 push $0x2 > Code; c0132093 <__vmalloc+37/224> > 11: 53 push %ebx > Code; c0132094 <__vmalloc+38/224> > 12: e8 3f 00 00 00 call 56 <_EIP+0x56> c01320d8 <__vmalloc+7c/224> > > > 13 warnings issued. Results may not be reliable. > --->8--[Cut Here]-->8--- > > Anything else I can provide? > > -- > Gregory K. Ade <gkade@bigbrother.net> > http://bigbrother.net/~gkade > OpenPGP Key ID: EAF4844B keyserver: pgpkeys.mit.edu *** Software bugs are stupid. Nevertheless it needs not so stupid people to solve them *** =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Heinz Mauelshagen Sistina Software Inc. Senior Consultant/Developer Am Sonnenhang 11 56242 Marienrachdorf Germany Mauelshagen@Sistina.com +49 2626 141200 FAX 924446 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- _______________________________________________ linux-lvm mailing list linux-lvm@sistina.com http://lists.sistina.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
