[Bug 241980] panic: I/O to pool appears to be hung on vdev

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241980

--- Comment #12 from Eugene Grosbein <eugen at 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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