tux3: crash upon writing data with bs=1M

[Daniel Phillips]

On Wednesday, January 02, 2013 03:27:38 PM Dongsu Park wrote:
>   # insmod ./user/kernel/tux3.ko
>   # ./user/tux3 mkfs -b 4096 /dev/vdb
>   # mount -t tux3 /dev/vdb /mnt/tux3
>   # dd if=/dev/zero of=/mnt/tux3/test1 bs=1M count=256
>
> ---------------------------------------------------------------------
> [  259.269921] tux3_fill_super: s_blocksize 4096
> [  339.038377] balloc: couldn't balloc: blocks 46390
> [  339.038434] ------------[ cut here ]------------
> [  339.038736] kernel BUG at 
/home/dpark/Dev/tux3/user/kernel/buffer_writeback.c:67!
>
> [  339.040036]  [<ffffffffa03f495a>] ? tux3_write_begin+0x3a/0x570 [tux3]
> [  339.040036]  [<ffffffffa03f2190>] ? blockget+0xd0/0xd0 [tux3]
> [  339.040036]  [<ffffffffa03fca83>] ? tux3_flush_inode+0x323/0x3e0 [tux3]
> [  339.040036]  [<ffffffffa03fcbd4>] ? tux3_flush_inodes+0x94/0xb0 [tux3]
> [  339.040036]  [<ffffffffa03ee435>] ? flush_delta_work+0x135/0x5a0 [tux3]
> [  339.040036]  [<ffffffffa03ee300>] ? setup_sb+0x30/0x30 [tux3]
> [  339.040036]  [<ffffffffa03ee300>] ? setup_sb+0x30/0x30 [tux3]
> [  339.040036]  [<ffffffff810609b6>] ? kthread+0xc6/0xd0
> [  339.040036]  [<ffffffff814fcec4>] ? kernel_thread_helper+0x4/0x10
> ...

Hi Dongsu,

Thanks for the report, and thanks for proving that you can build Tux3 as a 
module. Tux3 hit an assert because bufvec->contig is not empty as it should 
be, definitely a bug. Let the debugging begin.

Regards,

Daniel