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Date:      Fri, 15 Nov 2019 09:52:17 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 241980] panic: I/O to pool appears to be hung on vdev
Message-ID:  <bug-241980-227-nAsFtx5lu8@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-241980-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-241980-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D241980

--- Comment #12 from Eugene Grosbein <eugen@freebsd.org> ---
ZFS seem to have some means to produce debugging output on-the-fly,
zfs_debug.c:

/*
 * Print these messages by running:
 * echo ::zfs_dbgmsg | mdb -k
 *
 * Monitor these messages by running:
 * dtrace -qn 'zfs-dbgmsg{printf("%s\n", stringof(arg0))}'
 *
 * When used with libzpool, monitor with:
 * dtrace -qn 'zfs$pid::zfs_dbgmsg:probe1{printf("%s\n", copyinstr(arg1))}'
 */
void
zfs_dbgmsg(const char *fmt, ...)

Does it work with FreeBSD?

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