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Re: kern/51377: fss(4) panic if snapshot mounted read/write

The following reply was made to PR kern/51377; it has been noted by GNATS.

From: Paul Goyette <>
Subject: Re: kern/51377: fss(4) panic if snapshot mounted read/write
Date: Sun, 31 Jul 2016 12:48:48 +0800 (PHT)

 The traceback here is somewhat misleading.  The frame which references 
 do_sys_waitid()+0x960 is really in proc_exit() at line 1193
 (gdb) list *do_sys_waitid+0x960
 0xffffffff80819231 is in do_sys_waitid 
 1188             * Release reference to text vnode
 1189             */
 1190            if (p->p_textvp)
 1191                    vrele(p->p_textvp);
 1193            mutex_destroy(&p->p_auxlock);
 1194            mutex_obj_free(p->p_lock);
 1195            mutex_destroy(&p->p_stmutex);
 1196            cv_destroy(&p->p_waitcv);
 1197            cv_destroy(&p->p_lwpcv);
 It would appear that mount_ffs(8) detected an inconsistency with the 
 snapshot (file-system dirty), and unmounted it (which generated the 
 "snapshot invalid: forced unmount" message).  then, when mount_ffs tried 
 to exit, it ran into a problem with its iamge/text file, resulting in 
 the panic.
 It is unclear to me how the fss unmount hook could have caused the 
 corruption of the process's text vnode.
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