ok, here's a different but similar crash that triggers on the testbox:
[ 233.438890] BUG: unable to handle kernel paging request at virtual address 7d93e000
[ 233.446390] printing eip: 784e9480 *pde = 01000067 *pte = 0593e000
[ 233.452630] Oops: 0000 [#1] DEBUG_PAGEALLOC
[ 233.456790]
[ 233.458264] Pid: 0, comm: swapper Not tainted (2.6.23 #5)
[ 233.463637] EIP: 0060:[<784e9480>] EFLAGS: 00010087 CPU: 0
[ 233.469101] EIP is at ata_qc_issue+0x90/0x380
[ 233.473429] EAX: 7d93dff0 EBX: 0000001f ECX: 7d93dff0 EDX: 798daf80
[ 233.479668] ESI: 00000020 EDI: 7d93de00 EBP: 7b54007c ESP: 78a13e14
[ 233.485908] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
[ 233.491282] Process swapper (pid: 0, ti=78a12000 task=789753e0 task.ti=78a12000)
[ 233.498473] Stack: 7d93de00 7b540000 7b540000 00000000 7d93dfe0 7b54007c 7d93db00 7b5417a4
[ 233.506793] 784c2490 784ef69e 784f21f3 7b52de98 7d93db00 7b540000 7b5417a4 7d93db00
[ 233.515112] 7b540000 7b524004 784f22e0 784ef380 784c2490 7d93db00 00000202 7b524004
[ 233.523432] Call Trace:
[ 233.526033] [<784c2490>] scsi_done+0x0/0x20
[ 233.530279] [<784ef69e>] ata_scsi_translate+0xbe/0x140
[ 233.535478] [<784f21f3>] ata_scsi_queuecmd+0x33/0x200
[ 233.540591] [<784f22e0>] ata_scsi_queuecmd+0x120/0x200
[ 233.545791] [<784ef380>] ata_scsi_rw_xlat+0x0/0x220
[ 233.550730] [<784c2490>] scsi_done+0x0/0x20
[ 233.554976] [<784c2d12>] scsi_dispatch_cmd+0x152/0x290
[ 233.560177] [<78135c67>] trace_hardirqs_on+0x67/0xb0
[ 233.565202] [<784c8c7e>] scsi_request_fn+0x1be/0x370
[ 233.570229] [<78408086>] blk_run_queue+0x36/0x80
[ 233.574909] [<784c7520>] scsi_next_command+0x30/0x50
[ 233.579935] [<784c76ab>] scsi_end_request+0xab/0xe0
[ 233.584875] [<784c83f9>] scsi_io_completion+0xa9/0x3d0
[ 233.590075] [<78135c67>] trace_hardirqs_on+0x67/0xb0
[ 233.595100] [<78405125>] blk_done_softirq+0x45/0x80
[ 233.600040] [<78405153>] blk_done_softirq+0x73/0x80
[ 233.604981] [<7811d4c3>] __do_softirq+0x53/0xb0
[ 233.609573] [<7811d588>] do_softirq+0x68/0x70
[ 233.613993] [<78105351>] do_IRQ+0x51/0x90
[ 233.618066] [<78135c9c>] trace_hardirqs_on+0x9c/0xb0
[ 233.623092] [<7810f2d0>] pgd_dtor+0x0/0x50
[ 233.627252] [<7810388e>] common_interrupt+0x2e/0x40
[ 233.632192] [<7810f2d0>] pgd_dtor+0x0/0x50
[ 233.636352] [<7815f3be>] quicklist_trim+0x5e/0x90
[ 233.641118] [<7810f2cb>] check_pgt_cache+0x1b/0x20
[ 233.645971] [<78100c52>] cpu_idle+0x32/0x60
[ 233.650217] [<78a14b35>] start_kernel+0x265/0x300
[ 233.654983] [<78a14380>] unknown_bootoption+0x0/0x1e0
[ 233.660097] =======================
[ 233.663649] Code: 00 00 00 8b 45 34 a8 02 0f 84 ed 00 00 00 8b bd 88 00 00 00 31 db 89 3c 24 8b 75 3c 89 f8 c7 44 24 10 00 00 00 00 eb 1b 8d 76 00 <8b> 50 10 8d 48 10 f6 c2 01 0f 85 be 02 00 00 89 44 24 10 83 c3
[ 233.682455] EIP: [<784e9480>] ata_qc_issue+0x90/0x380 SS:ESP 0068:78a13e14
[ 233.689302] Kernel panic - not syncing: Fatal exception in interrupt
(gdb) list *0x784e9480
0x784e9480 is in ata_qc_issue (include/linux/scatterlist.h:48).
43 */
44 static inline struct scatterlist *sg_next(struct scatterlist *sg)
45 {
46 sg++;
47
48 if (unlikely(sg_is_chain(sg)))
49 sg = sg_chain_ptr(sg);
50
51 return sg;
52 }
(gdb)
so there's sg_next() involvement too. Below is the disassembly.
Ingo
------------------------->
784e93f0 <ata_qc_issue>:
784e93f0: 55 push %ebp
784e93f1: 89 c5 mov %eax,%ebp
784e93f3: 57 push %edi
784e93f4: 56 push %esi
784e93f5: 53 push %ebx
784e93f6: 83 ec 14 sub $0x14,%esp
784e93f9: 8b 00 mov (%eax),%eax
784e93fb: 89 44 24 04 mov %eax,0x4(%esp)
784e93ff: 8b 45 04 mov 0x4(%ebp),%eax
784e9402: 80 7d 14 04 cmpb $0x4,0x14(%ebp)
784e9406: 8b 10 mov (%eax),%edx
784e9408: 0f 84 d2 01 00 00 je 784e95e0 <ata_qc_issue+0x1f0>
784e940e: 8b 5c 24 04 mov 0x4(%esp),%ebx
784e9412: 83 83 84 16 00 00 01 addl $0x1,0x1684(%ebx)
784e9419: 8b 45 38 mov 0x38(%ebp),%eax
784e941c: 89 42 08 mov %eax,0x8(%edx)
784e941f: 83 4d 34 01 orl $0x1,0x34(%ebp)
784e9423: b8 01 00 00 00 mov $0x1,%eax
784e9428: 8b 4d 38 mov 0x38(%ebp),%ecx
784e942b: 89 c7 mov %eax,%edi
784e942d: 8b 54 24 04 mov 0x4(%esp),%edx
784e9431: d3 e7 shl %cl,%edi
784e9433: 09 ba 80 16 00 00 or %edi,0x1680(%edx)
784e9439: 8b 4d 00 mov 0x0(%ebp),%ecx
784e943c: 89 4c 24 08 mov %ecx,0x8(%esp)
784e9440: 80 7d 14 07 cmpb $0x7,0x14(%ebp)
784e9444: 0f 87 c6 00 00 00 ja 784e9510 <ata_qc_issue+0x120>
784e944a: 0f be 4d 14 movsbl 0x14(%ebp),%ecx
784e944e: d3 e0 shl %cl,%eax
784e9450: a8 98 test $0x98,%al
784e9452: 0f 84 ab 00 00 00 je 784e9503 <ata_qc_issue+0x113>
784e9458: 8b 45 34 mov 0x34(%ebp),%eax
784e945b: a8 02 test $0x2,%al
784e945d: 0f 84 ed 00 00 00 je 784e9550 <ata_qc_issue+0x160>
784e9463: 8b bd 88 00 00 00 mov 0x88(%ebp),%edi
784e9469: 31 db xor %ebx,%ebx
784e946b: 89 3c 24 mov %edi,(%esp)
784e946e: 8b 75 3c mov 0x3c(%ebp),%esi
784e9471: 89 f8 mov %edi,%eax
784e9473: c7 44 24 10 00 00 00 movl $0x0,0x10(%esp)
784e947a: 00
784e947b: eb 1b jmp 784e9498 <ata_qc_issue+0xa8>
784e947d: 8d 76 00 lea 0x0(%esi),%esi
784e9480: 8b 50 10 mov 0x10(%eax),%edx
784e9483: 8d 48 10 lea 0x10(%eax),%ecx
784e9486: f6 c2 01 test $0x1,%dl
784e9489: 0f 85 be 02 00 00 jne 784e974d <ata_qc_issue+0x35d>
784e948f: 89 44 24 10 mov %eax,0x10(%esp)
784e9493: 83 c3 01 add $0x1,%ebx
784e9496: 89 c8 mov %ecx,%eax
784e9498: 39 f3 cmp %esi,%ebx
784e949a: 75 e4 jne 784e9480 <ata_qc_issue+0x90>
784e949c: 8b 54 24 10 mov 0x10(%esp),%edx
784e94a0: 8b 42 0c mov 0xc(%edx),%eax
784e94a3: 83 e0 03 and $0x3,%eax
784e94a6: 85 c0 test %eax,%eax
784e94a8: 89 45 4c mov %eax,0x4c(%ebp)
784e94ab: 0f 85 53 01 00 00 jne 784e9604 <ata_qc_issue+0x214>
784e94b1: 89 f1 mov %esi,%ecx
784e94b3: 83 f9 00 cmp $0x0,%ecx
784e94b6: 0f 84 df 01 00 00 je 784e969b <ata_qc_issue+0x2ab>
784e94bc: 7e 30 jle 784e94ee <ata_qc_issue+0xfe>
784e94be: 31 d2 xor %edx,%edx
784e94c0: 8b 1c 24 mov (%esp),%ebx
784e94c3: 83 c2 01 add $0x1,%edx
784e94c6: 8b 03 mov (%ebx),%eax
784e94c8: 2b 05 f8 ec d7 78 sub 0x78d7ecf8,%eax
784e94ce: c1 f8 05 sar $0x5,%eax
784e94d1: c1 e0 0c shl $0xc,%eax
784e94d4: 03 43 04 add 0x4(%ebx),%eax
784e94d7: 89 43 08 mov %eax,0x8(%ebx)
784e94da: 83 c3 10 add $0x10,%ebx
784e94dd: 89 1c 24 mov %ebx,(%esp)
784e94e0: 8b 03 mov (%ebx),%eax
784e94e2: a8 01 test $0x1,%al
784e94e4: 0f 85 6d 02 00 00 jne 784e9757 <ata_qc_issue+0x367>
784e94ea: 39 ca cmp %ecx,%edx
784e94ec: 75 d2 jne 784e94c0 <ata_qc_issue+0xd0>
784e94ee: f0 83 44 24 00 00 lock addl $0x0,0x0(%esp)
784e94f4: 85 c9 test %ecx,%ecx
784e94f6: 89 c8 mov %ecx,%eax
784e94f8: 0f 8e 2c 02 00 00 jle 784e972a <ata_qc_issue+0x33a>
784e94fe: 89 45 3c mov %eax,0x3c(%ebp)
784e9501: eb 11 jmp 784e9514 <ata_qc_issue+0x124>
784e9503: a8 24 test $0x24,%al
784e9505: 0f 85 b5 00 00 00 jne 784e95c0 <ata_qc_issue+0x1d0>
784e950b: 90 nop
784e950c: 8d 74 26 00 lea 0x0(%esi),%esi
784e9510: 83 65 34 f9 andl $0xfffffff9,0x34(%ebp)
784e9514: 8b 5c 24 04 mov 0x4(%esp),%ebx
784e9518: 89 e8 mov %ebp,%eax
784e951a: 8b 53 04 mov 0x4(%ebx),%edx
784e951d: ff 52 48 call *0x48(%edx)
784e9520: 8b 9d 8c 00 00 00 mov 0x8c(%ebp),%ebx
784e9526: 89 e8 mov %ebp,%eax
784e9528: 8b 7c 24 04 mov 0x4(%esp),%edi
784e952c: 8b 57 04 mov 0x4(%edi),%edx
784e952f: ff 52 4c call *0x4c(%edx)
784e9532: 09 d8 or %ebx,%eax
784e9534: 85 c0 test %eax,%eax
784e9536: 89 85 8c 00 00 00 mov %eax,0x8c(%ebp)
784e953c: 0f 85 fd 01 00 00 jne 784e973f <ata_qc_issue+0x34f>
784e9542: 83 c4 14 add $0x14,%esp
784e9545: 5b pop %ebx
784e9546: 5e pop %esi
784e9547: 5f pop %edi
784e9548: 5d pop %ebp
784e9549: c3 ret
784e954a: 8d b6 00 00 00 00 lea 0x0(%esi),%esi
784e9550: a8 04 test $0x4,%al
784e9552: 74 c0 je 784e9514 <ata_qc_issue+0x124>
784e9554: 8b 95 88 00 00 00 mov 0x88(%ebp),%edx
784e955a: 8b 42 0c mov 0xc(%edx),%eax
784e955d: 83 e0 03 and $0x3,%eax
784e9560: 85 c0 test %eax,%eax
784e9562: 89 45 4c mov %eax,0x4c(%ebp)
784e9565: 0f 84 3a 01 00 00 je 784e96a5 <ata_qc_issue+0x2b5>
784e956b: 8b 45 38 mov 0x38(%ebp),%eax
784e956e: 8d 3c 85 00 00 00 00 lea 0x0(,%eax,4),%edi
784e9575: 8b 44 24 08 mov 0x8(%esp),%eax
784e9579: 03 78 24 add 0x24(%eax),%edi
784e957c: c7 07 00 00 00 00 movl $0x0,(%edi)
784e9582: f6 45 10 08 testb $0x8,0x10(%ebp)
784e9586: 0f 85 3a 01 00 00 jne 784e96c6 <ata_qc_issue+0x2d6>
784e958c: 8b 4c 24 08 mov 0x8(%esp),%ecx
784e9590: 8b 45 38 mov 0x38(%ebp),%eax
784e9593: c1 e0 02 shl $0x2,%eax
784e9596: 03 41 28 add 0x28(%ecx),%eax
784e9599: c7 85 80 00 00 00 04 movl $0x4,0x80(%ebp)
784e95a0: 00 00 00
784e95a3: 89 45 7c mov %eax,0x7c(%ebp)
784e95a6: 8b 42 0c mov 0xc(%edx),%eax
784e95a9: 2b 45 4c sub 0x4c(%ebp),%eax
784e95ac: 85 c0 test %eax,%eax
784e95ae: 89 42 0c mov %eax,0xc(%edx)
784e95b1: 0f 85 ee 00 00 00 jne 784e96a5 <ata_qc_issue+0x2b5>
784e95b7: 83 6d 3c 01 subl $0x1,0x3c(%ebp)
784e95bb: e9 54 ff ff ff jmp 784e9514 <ata_qc_issue+0x124>
784e95c0: 8b 5c 24 08 mov 0x8(%esp),%ebx
784e95c4: 80 7b 0c 00 cmpb $0x0,0xc(%ebx)
784e95c8: 0f 89 42 ff ff ff jns 784e9510 <ata_qc_issue+0x120>
784e95ce: 8b 45 34 mov 0x34(%ebp),%eax
784e95d1: a8 02 test $0x2,%al
784e95d3: 0f 84 77 ff ff ff je 784e9550 <ata_qc_issue+0x160>
784e95d9: e9 85 fe ff ff jmp 784e9463 <ata_qc_issue+0x73>
784e95de: 89 f6 mov %esi,%esi
784e95e0: 8b 42 0c mov 0xc(%edx),%eax
784e95e3: 85 c0 test %eax,%eax
784e95e5: 75 0b jne 784e95f2 <ata_qc_issue+0x202>
784e95e7: 8b 4c 24 04 mov 0x4(%esp),%ecx
784e95eb: 83 81 84 16 00 00 01 addl $0x1,0x1684(%ecx)
784e95f2: 8b 4d 38 mov 0x38(%ebp),%ecx
784e95f5: b8 01 00 00 00 mov $0x1,%eax
784e95fa: d3 e0 shl %cl,%eax
784e95fc: 09 42 0c or %eax,0xc(%edx)
784e95ff: e9 1b fe ff ff jmp 784e941f <ata_qc_issue+0x2f>
784e9604: 8b 45 38 mov 0x38(%ebp),%eax
784e9607: 8b 4c 24 08 mov 0x8(%esp),%ecx
784e960b: c1 e0 02 shl $0x2,%eax
784e960e: 89 44 24 0c mov %eax,0xc(%esp)
784e9612: 8b 49 24 mov 0x24(%ecx),%ecx
784e9615: 01 c8 add %ecx,%eax
784e9617: 89 44 24 0c mov %eax,0xc(%esp)
784e961b: c7 00 00 00 00 00 movl $0x0,(%eax)
784e9621: 8b 5c 24 10 mov 0x10(%esp),%ebx
784e9625: 8b 7c 24 10 mov 0x10(%esp),%edi
784e9629: 8b 53 04 mov 0x4(%ebx),%edx
784e962c: 03 53 0c add 0xc(%ebx),%edx
784e962f: 8b 07 mov (%edi),%eax
784e9631: 8b 1d f8 ec d7 78 mov 0x78d7ecf8,%ebx
784e9637: 2b 55 4c sub 0x4c(%ebp),%edx
784e963a: 29 d8 sub %ebx,%eax
784e963c: 89 d1 mov %edx,%ecx
784e963e: c1 f8 05 sar $0x5,%eax
784e9641: 81 e2 ff 0f 00 00 and $0xfff,%edx
784e9647: c1 e9 0c shr $0xc,%ecx
784e964a: 01 c8 add %ecx,%eax
784e964c: c1 e0 05 shl $0x5,%eax
784e964f: 01 c3 add %eax,%ebx
784e9651: f6 45 10 08 testb $0x8,0x10(%ebp)
784e9655: 89 5d 74 mov %ebx,0x74(%ebp)
784e9658: 89 55 78 mov %edx,0x78(%ebp)
784e965b: 0f 85 88 00 00 00 jne 784e96e9 <ata_qc_issue+0x2f9>
784e9661: 8b 54 24 08 mov 0x8(%esp),%edx
784e9665: 8b 45 38 mov 0x38(%ebp),%eax
784e9668: c1 e0 02 shl $0x2,%eax
784e966b: 03 42 28 add 0x28(%edx),%eax
784e966e: c7 85 80 00 00 00 04 movl $0x4,0x80(%ebp)
784e9675: 00 00 00
784e9678: 89 45 7c mov %eax,0x7c(%ebp)
784e967b: 8b 4c 24 10 mov 0x10(%esp),%ecx
784e967f: 8b 41 0c mov 0xc(%ecx),%eax
784e9682: 2b 45 4c sub 0x4c(%ebp),%eax
784e9685: 85 c0 test %eax,%eax
784e9687: 89 41 0c mov %eax,0xc(%ecx)
784e968a: 75 32 jne 784e96be <ata_qc_issue+0x2ce>
784e968c: 8b 4d 3c mov 0x3c(%ebp),%ecx
784e968f: 85 c9 test %ecx,%ecx
784e9691: 74 08 je 784e969b <ata_qc_issue+0x2ab>
784e9693: 83 e9 01 sub $0x1,%ecx
784e9696: e9 18 fe ff ff jmp 784e94b3 <ata_qc_issue+0xc3>
784e969b: 31 c0 xor %eax,%eax
784e969d: 8d 76 00 lea 0x0(%esi),%esi
784e96a0: e9 59 fe ff ff jmp 784e94fe <ata_qc_issue+0x10e>
784e96a5: 8b 85 84 00 00 00 mov 0x84(%ebp),%eax
784e96ab: f0 83 44 24 00 00 lock addl $0x0,0x0(%esp)
784e96b1: 2d 00 00 00 78 sub $0x78000000,%eax
784e96b6: 89 42 08 mov %eax,0x8(%edx)
784e96b9: e9 56 fe ff ff jmp 784e9514 <ata_qc_issue+0x124>
784e96be: 8b 75 3c mov 0x3c(%ebp),%esi
784e96c1: e9 eb fd ff ff jmp 784e94b1 <ata_qc_issue+0xc1>
784e96c6: 8b 45 4c mov 0x4c(%ebp),%eax
784e96c9: 8b 72 0c mov 0xc(%edx),%esi
784e96cc: 03 b5 84 00 00 00 add 0x84(%ebp),%esi
784e96d2: 89 c1 mov %eax,%ecx
784e96d4: c1 e9 02 shr $0x2,%ecx
784e96d7: 29 c6 sub %eax,%esi
784e96d9: f3 a5 rep movsl %ds:(%esi),%es:(%edi)
784e96db: 89 c1 mov %eax,%ecx
784e96dd: 83 e1 03 and $0x3,%ecx
784e96e0: 74 02 je 784e96e4 <ata_qc_issue+0x2f4>
784e96e2: f3 a4 rep movsb %ds:(%esi),%es:(%edi)
784e96e4: e9 a3 fe ff ff jmp 784e958c <ata_qc_issue+0x19c>
784e96e9: 89 e2 mov %esp,%edx
784e96eb: 81 e2 00 e0 ff ff and $0xffffe000,%edx
784e96f1: 83 42 14 01 addl $0x1,0x14(%edx)
784e96f5: 8b 45 4c mov 0x4c(%ebp),%eax
784e96f8: 2b 1d f8 ec d7 78 sub 0x78d7ecf8,%ebx
784e96fe: 8b 7c 24 0c mov 0xc(%esp),%edi
784e9702: c1 fb 05 sar $0x5,%ebx
784e9705: 89 c1 mov %eax,%ecx
784e9707: c1 e3 0c shl $0xc,%ebx
784e970a: 8d b3 00 00 00 78 lea 0x78000000(%ebx),%esi
784e9710: c1 e9 02 shr $0x2,%ecx
784e9713: 03 75 78 add 0x78(%ebp),%esi
784e9716: f3 a5 rep movsl %ds:(%esi),%es:(%edi)
784e9718: 89 c1 mov %eax,%ecx
784e971a: 83 e1 03 and $0x3,%ecx
784e971d: 74 02 je 784e9721 <ata_qc_issue+0x331>
784e971f: f3 a4 rep movsb %ds:(%esi),%es:(%edi)
784e9721: 83 6a 14 01 subl $0x1,0x14(%edx)
784e9725: e9 37 ff ff ff jmp 784e9661 <ata_qc_issue+0x271>
784e972a: 8b 54 24 10 mov 0x10(%esp),%edx
784e972e: 8b 45 4c mov 0x4c(%ebp),%eax
784e9731: 01 42 0c add %eax,0xc(%edx)
784e9734: 83 65 34 f9 andl $0xfffffff9,0x34(%ebp)
784e9738: 83 8d 8c 00 00 00 40 orl $0x40,0x8c(%ebp)
784e973f: 83 c4 14 add $0x14,%esp
784e9742: 89 e8 mov %ebp,%eax
784e9744: 5b pop %ebx
784e9745: 5e pop %esi
784e9746: 5f pop %edi
784e9747: 5d pop %ebp
784e9748: e9 23 fc ff ff jmp 784e9370 <ata_qc_complete>
784e974d: 89 d1 mov %edx,%ecx
784e974f: 83 e1 fe and $0xfffffffe,%ecx
784e9752: e9 38 fd ff ff jmp 784e948f <ata_qc_issue+0x9f>
784e9757: 83 e0 fe and $0xfffffffe,%eax
784e975a: 89 04 24 mov %eax,(%esp)
784e975d: e9 88 fd ff ff jmp 784e94ea <ata_qc_issue+0xfa>
784e9762: 8d b4 26 00 00 00 00 lea 0x0(%esi),%esi
784e9769: 8d bc 27 00 00 00 00 lea 0x0(%edi),%edi
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