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kern/44378: uprintf() get lost in rump kernel

>Number:         44378
>Category:       kern
>Synopsis:       uprintf() get lost in rump kernel
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jan 12 18:20:00 +0000 2011
>Originator:     Manuel Bouyer
>Release:        NetBSD 5.99.42
System: NetBSD 5.99.42 NetBSD 5.99.42 (XEN3_DOMU) #0: Sat Jan  1 
03:39:17 UTC 2011
Architecture: amd64
Machine: amd64
        trying rump_ffs on a filesystem image with unsupported features
        (like a unsupported flag in fs_flags) fails with EINVAL.
        The kernel also does a uprintf() with details about the unsupported
        feature, but this doesn't show up even with RUMP_VERBOSE.
        I would expect this message to go to stderr.
        This can probably be repeated by filling up the rump_ffs-mounted
        filesystem; this triggers the uprintf() at the end of
        ffs_alloc(), ffs_realloccg() or ffs_valloc().

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