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SubjectRe: 2.2.6 ext2 kernel oops
Date
> using 2.2.6 and managed to get the following kernel oops. Missing code to
> check error conditions?

Possibly.

> scsi0: MEDIUM ERROR on channel 0, id 4, lun 0, CDB: Read (6) 1b 00 53 02 00
> Current error sd08:01: sense key Medium Error
> Additional sense indicates Unrecovered read error

That is a bad block.

> EXT2-fs error (device sd(8,1)): read_block_bitmap: Cannot read block bitmap - block_group = 108, block_bitmap = 884746

ext2fs needless to say gets a bit upset

> tar: usr/bin/orbit-idl: Could not write to file: Input/output error

The I/O is aborted

> Unable to handle kernel NULL pointer dereference at virtual address 00000024
> current->tss.cr3 = 07394000, %cr3 = 07394000
> *pde = 00000000
> Oops: 0000
> CPU: 0
> EIP: 0010:[<c0144ae8>]
> EFLAGS: 00010246
> eax: 0000006c ebx: 00000000 ecx: 00000000 edx: c706f800
> esi: c1999ed0 edi: c706f800 ebp: 000d4001 esp: c2d2de00
> ds: 0018 es: 0018 ss: 0018
> Process tar (pid: 364, process nr: 26, stackpage=c2d2d000)
> Stack: c2d2df14 000d4001 000d799e c62f8660 00000001 c706f800 000d8000 00000000
> 00000801 000d799e 00000400 c6fd2800 c6fd5980 000d799e 0000006c 00000000
> c7534f20 c0146e8c c1999ed0 000d4001 c1999fd4 c1999fd0 c2d2df14 ffffffff
> Call Trace: [<c0146e8c>] [<c01471ee>] [<c01475f3>] [<c0145ad5>] [<c01458f0>] [<c0129747>] [<c0148aaa>]
> [<c012ea48>] [<c0112804>] [<c012e30e>] [<c011275c>] [<c0127c8f>] [<c0108d14>]
> Code: 8b 73 24 8b 4a 54 c1 e9 03 89 f5 74 0c 89 f7 31 c0 fc f2 ae
> Broken pipe

On an error read_block_bitmap sets the block group number and sets the
pointer to NULL. I can't see any cases this is then not picked up, hence
I need the ksymoops data from your crash

Alan


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