Hello List, Testing LVM with 2 spare partitions on one of my harddrives I found the following problem with DEVFS + LVM. If I make a VG inactive (vgchange -an) the partitions associated with it become unavailable. I can still see them in /dev/ide/../part3 but trying to access them gives a kernel OOPS (see below). It looks like the LVM does something nasty to the devfs structure. I tried it with several different kernels and devfs version, the result was the same every time. After much compiling and rebooting I pinpointed the problem down to the PATCHES archive. If I use a non-patched LVM from the kernel everything works. I looked at the patch but didn't find a reference to devfs or similar changes that might explain that behaviour. I put the patch on http://mike.it-loops.com/lvm/lvm-1.0.1-2.4.16.patch.gz if someone wants to take a look at it. BTW, a non devfs-kernel works with the patch just fine. I hope I gave all the relevant information, if someone needs more I'd be glad to provide it. Kind regards, Michael Guntsche ________OOPS_________ ksymoops 2.4.3 on i686 2.4.16. Options used -V (default) -k /proc/ksyms (default) -l /proc/modules (default) -o /lib/modules/2.4.16/ (default) -m /boot/System.map (specified) Nov 27 18:19:41 deepblue kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000018 Nov 27 18:19:41 deepblue kernel: c0152f46 Nov 27 18:19:41 deepblue kernel: *pde = 00000000 Nov 27 18:19:41 deepblue kernel: Oops: 0002 Nov 27 18:19:41 deepblue kernel: CPU: 0 Nov 27 18:19:41 deepblue kernel: EIP: 0010:[devfs_open+118/352] Not tainted Nov 27 18:19:41 deepblue kernel: EFLAGS: 00010282 Nov 27 18:19:41 deepblue kernel: eax: 00000000 ebx: cff5d8c0 ecx: cd7b29c0 edx: c01efd20 Nov 27 18:19:41 deepblue kernel: esi: cfc5b480 edi: cff5d8c8 ebp: cd7b29c0 esp: cd675f40 Nov 27 18:19:41 deepblue kernel: ds: 0018 es: 0018 ss: 0018 Nov 27 18:19:41 deepblue kernel: Process vgchange (pid: 620, stackpage=cd675000) Nov 27 18:19:41 deepblue kernel: Stack: cd7b29c0 cfc5b480 ffffffe9 cffe93c0 c01e7020 c012f081 cfc5b480 cd7b29c0 Nov 27 18:19:41 deepblue kernel: 0804d554 cff4c000 00000000 bffff4fc c012ef92 cfc5f8c0 cffe93c0 00000000 Nov 27 18:19:41 deepblue kernel: 00000004 cff4c000 0804d554 cfc5f8c0 cffe93c0 0804d554 bffff4fc 00000000 Nov 27 18:19:41 deepblue kernel: Call Trace: [dentry_open+225/400] [filp_open+82/96] [sys_open+54/160] [system_call+51/56] Nov 27 18:19:41 deepblue kernel: Code: 89 50 18 eb 2b 90 8d 74 26 00 8b 43 08 85 c0 74 1a 8b 00 85 Using defaults from ksymoops -t elf32-i386 -a i386 Code; 00000000 Before first symbol 00000000 <_EIP>: Code; 00000000 Before first symbol 0: 89 50 18 mov %edx,0x18(%eax) Code; 00000002 Before first symbol 3: eb 2b jmp 30 <_EIP+0x30> 00000030 Before first symbol Code; 00000004 Before first symbol 5: 90 nop Code; 00000006 Before first symbol 6: 8d 74 26 00 lea 0x0(%esi,1),%esi Code; 0000000a Before first symbol a: 8b 43 08 mov 0x8(%ebx),%eax Code; 0000000c Before first symbol d: 85 c0 test %eax,%eax Code; 0000000e Before first symbol f: 74 1a je 2b <_EIP+0x2b> 0000002a Before first symbol Code; 00000010 Before first symbol 11: 8b 00 mov (%eax),%eax Code; 00000012 Before first symbol 13: 85 00 test %eax,(%eax) ________________
