Also I try to upgrade my kernel and insert disk I already use with previous releases (so udf structures on this disc are correct) I got same problem pktcdvd: inserted media is CD-RW pktcdvd: Fixed packets, 32 blocks, Mode-2 disc pktcdvd: speed (R/W) 6/4 pktcdvd: 551488kB available on disc UDF-fs DEBUG lowlevel.c:57:udf_get_last_session: XA disk: no, vol_desc_start=0 UDF-fs DEBUG super.c:1413:udf_read_super: Multi-session=0 UDF-fs DEBUG super.c:410:udf_vrs: Starting at sector 16 (2048 byte sectors) Unable to handle kernel NULL pointer dereference at virtual address 00000174 printing eip: d29d1781 *pde = 00000000 Oops: 0000 CPU: 0 EIP: 0010:[<d29d1781>] Not tainted EFLAGS: 00010282 eax: 00000140 ebx: 00008000 ecx: 0000000b edx: cb3e6740 esi: 00000120 edi: cb5ca510 ebp: cb5ca400 esp: cb4a5db0 ds: 0018 es: 0018 ss: 0018 Process mount (pid: 1201, stackpage=cb4a5000) Stack: cb5ca400 00000100 00000100 cb4a5dda 00000246 00000000 cb5ca4e4 cb3e6540 00000003 00000140 0002a400 00000000 cb5ca400 d29d1290 cb5ca400 cb5ca440 cb5ca400 00000000 cb4a5e3c d29d1f43 cb5ca400 cb4a5e3c 00000000 d29d6a27 Call Trace: [<d29d1290>] [<d29d1f43>] [<d29d6a27>] [<d291f2e3>] [<d29a7193>] [<d290af00>] [<d290ffff>] [<d29acf20>] [<c013f064>] [<c015052c>] [<c015047a>] [<d29d8060>] [<c013f63e>] [<d29d8060>] [<c01515be>] [<c01518a0>] [<c01516e9>] [<c01519b1>] [<c01072ab>] Code: 8b 40 34 d3 fb 01 f3 8b 68 18 89 14 24 d3 fd 03 6c 24 24 e8 Now I have blackhole# uname -a Linux blackhole.adamant.net 2.4.19-pre1-ac1 #1 Втр Фев 26 10:33:58 EET 2002 i686 unknown blackhole# packet patch version unchanged -- Best regard, Alexander Trotsai aka MAGE-RIPE aka MAGE-UANIC My PGP at ftp://blackhole.adamant.net/pgp/trotsai.key[.asc] Big trouble - electromagnetic radiation from satellite debris