From owner-freebsd-bugs  Sat Jun 16  7:50:19 2001
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Date: Sat, 16 Jun 2001 07:50:02 -0700 (PDT)
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From: Thomas Quinot <thomas@cuivre.fr.eu.org>
Subject: Re: kern/24596: sysinstall crash: Page fault while in kernel mode
Reply-To: Thomas Quinot <thomas@cuivre.fr.eu.org>
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The following reply was made to PR kern/24596; it has been noted by GNATS.

From: Thomas Quinot <thomas@cuivre.fr.eu.org>
To: freebsd-gnats-submit@FreeBSD.org, stable@freebsd.org
Cc:  
Subject: Re: kern/24596: sysinstall crash: Page fault while in kernel mode
Date: Sat, 16 Jun 2001 16:40:53 +0200

 Le 2001-06-16, Thomas Quinot écrivait :
 
 > (kgdb) print *pdev
 > $3 = {si_flags = 0, si_udev = 69378, si_hash = {le_next = 0xc0342818, 
 >     le_prev = 0xc0c48a88}, si_hlist = {slh_first = 0x0}, 
 >   si_name = "cd0", '\000' <repeats 12 times>, si_drv1 = 0x0, si_drv2 = 0x0, 
 >   si_devsw = 0xc033e540, si_devfs = 0x0, si_bdevfs = 0x0, 
 >   si_iosize_max = 65536, __si_u = {__si_tty = {__sit_tty = 0xc0c46034}, 
 >     __si_disk = {__sid_disk = 0xc0c46034, __sid_mountpoint = 0x0, 
 >       __sid_bsize_phys = 0, __sid_bsize_best = 0}}}
 
 Since we had some indication (si_name) that this problem was related
 to cd0 (an HP Surestore CDW 6020) I investigated that direction a bit further.
 I was able to recreate a similar crash when trying to mount a CD, but
 the crash dump was of no help (the stack frame pointer was apparently
 wrong, and gdb was unable to produce a backtrace).
 
 However, I noted that these crashes occur only when one specific
 faulty disc is present in the CD burner at boot time (a failed disc
 that was not fixated correctly). When this CD is in the drive at boot
 time, I get the following messages:
 
 (cd0:sym0:0:2:0): got CAM status 0x4c
 (cd0:sym0:0:2:0): fatal error, failed to attach to device
 (cd0:sym0:0:2:0): lost device
 (cd0:sym0:0:2:0): removing device entry
 
 When the CD is not in the drive at boot time, I get no such error, and
 sysinstall and mounting a CD work correctly afterward.
 
 Hope this helps,
 Thomas.
 
 -- 
     Thomas.Quinot@Cuivre.FR.EU.ORG

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