Hi,

We have tried the following:
- removing a USB mass storage device (USB memory "key") on /dev/sda while
  accessing /dev/sda via mcopy
- removing a USB mass storage device while /dev/sda is mounted.

We have observed the following two different behaviors on different
kernels:

1. On a RedHat 2.4.20-8 or -9 kernel, mcopy and umount respectively are
   killed (mcopy obviously gets a EIO).

2. On other kernels, both processes stay indefinitely in the "D" state,
   which behavior we DON'T want.

Does somebody here know what motivates those different machines/kernels to
have such different reactions to the same actions?
A kernel patch? Some kernel settings?


Best regards,

David Monniaux            http://www.di.ens.fr/~monniaux
Laboratoire d'informatique de l'�cole Normale Sup�rieure,
Paris, France



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