I have a read error on one drive that triggers an oops.
HEAD=99abfeafb5f2eea1bb481330ff37343e1133c924
-----------
hdg: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hdg: dma_intr: error=0x40 { UncorrectableError }, LBAsect=227940458, high=13,
low=9836650, sector=227940352
ide: failed opcode was: unknown
end_request: I/O error, dev hdg, sector 227940352
BUG: unable to handle kernel paging request at virtual address 6b707483
printing eip:
c0241019
*pde = 00000000
Oops: 0002 [#1]
DEBUG_PAGEALLOC
Modules linked in: netconsole ipv6 ppdev lp dm_snapshot dm_mirror sk98lin st
via_agp uhci_hcd skge aic7xxx scsi_transport_spi agpgart evdev sd_mod
CPU: 0
EIP: 0060:[<c0241019>] Not tainted VLI
EFLAGS: 00210006 (2.6.20-rc6 #5)
EIP is at __end_that_request_first+0x3e9/0x540
eax: 6b70747b ebx: ee542f90 ecx: 00000001 edx: 0001adb0
esi: 00010000 edi: 00000000 ebp: ebe53e64 esp: ebe53e08
ds: 007b es: 007b ss: 0068
Process rosetta_5.43_i6 (pid: 2437, ti=ebe52000 task=ebdcb5d0 task.ti=ebe52000)
Stack: fffffffb ef7c9f04 0d961800 00000000 00000000 c057e580 ebe53e94 00200046
c0515f7c d9a7ff40 00001000 00001000 fffffffb 00000001 00000001 c0515f60
00200082 00000000 ebe53e6c c03f2d1a d9a7ff40 c07ca680 00000001 ebe53e6c
Call Trace:
[<c0103e9a>] show_trace_log_lvl+0x1a/0x30
[<c0103f59>] show_stack_log_lvl+0xa9/0xd0
[<c010413e>] show_registers+0x1be/0x2a0
[<c0104333>] die+0x113/0x270
[<c03f45f0>] do_page_fault+0x2b0/0x5d0
[<c03f2ecc>] error_code+0x74/0x7c
[<c024118b>] end_that_request_first+0xb/0x10
[<c02e6ff3>] ide_end_request+0x63/0x100
[<c02e70b4>] ide_kill_rq+0x24/0x50
[<c02e7f4b>] __ide_error+0x9b/0x270
[<c02e818b>] ide_error+0x6b/0x90
[<c02ef2b6>] ide_dma_intr+0x46/0xc0
[<c02e7ca4>] ide_intr+0x74/0x1e0
[<c013d678>] handle_IRQ_event+0x28/0x60
-----------
This was triggered by the badblocks program. The last output was
Checking for bad blocks (read-only test): 113968064/ 245117375
the numbers are in block where a block is 1024.
Now I would like to write over the bad block with zeros but I want to
write as little as I could possibly do so I need to convert the sector
numbers to something I can use with dd.
But what sector is wrong here ? LBAsect=227940458 or sector=227940352
and how do I turn this into a byte offset "dd if=/dev/zero of=/dev/hdg
bs=512 count=1 seek=??????
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