Date: Sun, 1 Feb 2004 19:12:57 +0100 (CET) From: Lukas Ertl <l.ertl@univie.ac.at> To: freebsd-geom@freebsd.org Cc: sos@freebsd.org Subject: Panic in g_disk_done() with atacontrol detach Message-ID: <20040201190653.M613@korben.in.tern>
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Hi,
I can provoke a panic when doing "atacontrol detach 1" if there's an
active filesystem on the disk being detached. The panic happens in
g_disk_done() at:
devstat_end_transaction_bio(dp->d_devstat, bp2);
The problem obviously is that ad_detach() calls disk_destroy() which nulls
out the softc, and in g_disk_done() this softc is referenced again.
The question is: is this an unsupported operation in the sense of "don't
do that"? If yes, then "atacontrol detach" should probably refuse to do
the actual detach when there are I/O requests running, this would prevent
a lot of foot shooting.
regards,
le
--
Lukas Ertl eMail: l.ertl@univie.ac.at
UNIX Systemadministrator Tel.: (+43 1) 4277-14073
Vienna University Computer Center Fax.: (+43 1) 4277-9140
University of Vienna http://mailbox.univie.ac.at/~le/
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