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filesystem suddenly read-only - how come?



  system: debian unstable, kernel 2.4.10

  my /home filesystem was suddenly read-only, here' what I've found:

/var/log/syslog:
...
Nov 15 23:38:01 localhost /USR/SBIN/CRON[18175]: (list) CMD ([ -x
/usr/bin/python -a -f /usr/lib/mailman/cron/q
runner ] && /usr/bin/python /usr/lib/mailman/cron/qrunner)
Nov 15 23:38:04 localhost kernel: EXT2-fs error (device ide0(3,71)):
ext2_new_block: Free blocks count corrupted for block group 120
Nov 15 23:38:04 localhost kernel: Remounting filesystem read-only
Nov 15 23:39:14 localhost squid[16292]: Squid Parent: child process
16295 exited due to signal 9
Nov 15 23:39:08 localhost kernel: __alloc_pages: 0-order allocation
failed (gfp=0x1d2/0) from c0127d7e
Nov 15 23:39:21 localhost kernel: VM: killing process mozilla-bin
Nov 15 23:39:21 localhost kernel: __alloc_pages: 0-order allocation
failed (gfp=0x1d2/0) from c0127d7e
Nov 15 23:39:21 localhost kernel: VM: killing process nmbd
Nov 15 23:39:21 localhost kernel: __alloc_pages: 0-order allocation
failed (gfp=0x1d2/0) from c0127d7e
Nov 15 23:39:21 localhost kernel: VM: killing process squid
Nov 15 23:39:20 localhost inetd[687]: /usr/sbin/tcpd: exit signal 0x9
Nov 15 23:39:30 localhost kernel: __alloc_pages: 0-order allocation
failed (gfp=0x1d2/0) from c0127d7e
Nov 15 23:39:31 localhost kernel: VM: killing process xmms
Nov 15 23:39:31 localhost kernel: __alloc_pages: 0-order allocation
failed (gfp=0x1d2/0) from c0127d7e
Nov 15 23:39:31 localhost kernel: VM: killing process smbd
Nov 15 23:39:34 localhost /USR/SBIN/CRON[18442]: (list) CMD ([ -x
/usr/bin/python -a -f /usr/lib/mailman/cron/q
runner ] && /usr/bin/python /usr/lib/mailman/cron/qrunner)

  the filesystem is set to remount read-only when an error is
encountered:

/dev/hdb7 on /home type ext2 (rw,errors=remount-ro)

  could that be the reason? I did not found what does the error below
mean? is the HD dying? or is it filesystem problem (this is the first
this problem occured)

  I unmounted the filesystem, filesystem check found:

------ fsck output begin
...
Pass 5: Checking block summary information
Block bitmap differences: -3937687
Fix<y>? yes


home: ***** FILE SYSTEM WAS MODIFIED *****
home: 208192/2443200 files (11.6% non-contiguous), 3643236/4883752
blocks
------ fsck output end

  I mounted the filesystem, restarted xdm and everything looks ok... any
ideas on what's going on?

  TIA

	erik



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