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AkihiroSuda avatar AkihiroSuda commented on July 19, 2024

Thank you a lot for reporting this issue.

AFAIK, FUSE does not support O_DIRECT.
https://sourceforge.net/p/fuse/mailman/message/27377600/
hanwen/go-fuse#146

So maybe we should support non-FUSE inspector as well (kprobes? NBD? iSCSI?)

PTAL @mitake

from namazu.

AkihiroSuda avatar AkihiroSuda commented on July 19, 2024

If you are just interesting in injecting an error or non-interruptible sleeps (i.e. makes whole the system sleep, not single LWP), I suggest using "guru"-mode SystemTap

e245f5a

PTAL @mitake what do you suggest for injecting interruptible sleeps for filesystem operations, with support for O_DIRECT?

from namazu.

mitake avatar mitake commented on July 19, 2024

@AkihiroSuda I think the approach based on block device (nbd, iSCSI, qemu, etc) is too costly because correspondence between file accesses and block requests will be hard to be analyzed. kprobe based approach would be suitable for the case.

from namazu.

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