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Subjectdd if=/dev/fd0... & sync
Date
Hi!

I noticed a strange thing in my linux 1.99.8 PC (Pentium) yesterday, I
made a backup copy of some floppyes with 'dd if=/dev/fd0 of=...' and
while dd was reading my floppy I wanted to check if there was enough
space left for a couple of floppyes on the partition wher I wrote
them, the when I wrote 'df' the df process hung and did nothing (^C or
^Z didn't work) until the dd process was done.

I tested this a bit further and found that when I'm reading a floppy
with dd, ex 'dd if=/dev/fd0 of=/dev/null', the systemcall sync()
(strace {df,sync} or whatever program that calls sync()) hangs while dd
is reading /dev/fd0. This is not the case in 1.2.13 nor 1.3.71, is
this possibly a bug somewhere or should it behave tis way (I don't
think so).

Here's .config if someone's interested.
--------------------------
CONFIG_EXPERIMENTAL=y
CONFIG_MODULES=y
CONFIG_KERNELD=y
CONFIG_NET=y
CONFIG_PCI=y
CONFIG_PCI_OPTIMIZE=y
CONFIG_SYSVIPC=y
CONFIG_BINFMT_AOUT=m
CONFIG_BINFMT_ELF=y
CONFIG_BINFMT_JAVA=m
CONFIG_KERNEL_ELF=y
CONFIG_M586=y
CONFIG_M586_COPY=y
CONFIG_BLK_DEV_FD=m
CONFIG_BLK_DEV_LOOP=m
CONFIG_BLK_DEV_RAM=m
CONFIG_INET=y
CONFIG_INET_RARP=m
CONFIG_IP_NOSR=y
CONFIG_SKB_LARGE=y
CONFIG_SCSI=y
CONFIG_BLK_DEV_SD=y
CONFIG_CHR_DEV_ST=m
CONFIG_BLK_DEV_SR=m
CONFIG_CHR_DEV_SG=m
CONFIG_SCSI_NCR53C7xx=y
CONFIG_SCSI_NCR53C7xx_sync=y
CONFIG_SCSI_NCR53C7xx_FAST=y
CONFIG_SCSI_NCR53C7xx_DISCONNECT=y
CONFIG_NETDEVICES=y
CONFIG_DUMMY=m
CONFIG_NET_ETHERNET=y
CONFIG_NET_VENDOR_3COM=y
CONFIG_EL3=m
CONFIG_VORTEX=m
CONFIG_NET_EISA=y
CONFIG_DE4X5=m
CONFIG_MINIX_FS=m
CONFIG_EXT_FS=m
CONFIG_EXT2_FS=y
CONFIG_XIA_FS=m
CONFIG_FAT_FS=m
CONFIG_MSDOS_FS=m
CONFIG_VFAT_FS=m
CONFIG_UMSDOS_FS=m
CONFIG_PROC_FS=y
CONFIG_NFS_FS=m
CONFIG_SMB_FS=m
CONFIG_ISO9660_FS=m
CONFIG_HPFS_FS=m
CONFIG_SYSV_FS=m
CONFIG_UFS_FS=m
CONFIG_BSD_DISKLABEL=y
CONFIG_SMD_DISKLABEL=y
CONFIG_SERIAL=m
CONFIG_PRINTER=m

--
Johnny Stenback, programmer / University of Vaasa, Computer Centre
E-Mail jst@uwasa.fi, Phone +358 61 3248 387, +358 50 5575 094


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