Re: kern/55699: Panic certainly in iSCSI initiator

[Paul Goyette <paul%whooppee.com@localhost>]

The following reply was made to PR kern/55699; it has been noted by GNATS.

From: Paul Goyette <paul%whooppee.com@localhost>
To: =?UTF-8?Q?BERTRAND_Jo=c3=abl?= <joel.bertrand%systella.fr@localhost>
Cc: gnats-bugs%netbsd.org@localhost, kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost, 
    netbsd-bugs%netbsd.org@localhost
Subject: Re: kern/55699: Panic certainly in iSCSI initiator
Date: Wed, 7 Oct 2020 08:07:05 -0700 (PDT)

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 That confirms that the module is being auto-loaded and -unloaded
 
 So now we just have to identify where it is being used-after-unload.
 
 
 
 On Wed, 7 Oct 2020, BERTRAND Jo=C3=ABl wrote:
 
 > Paul Goyette a =C3=A9crit=C2=A0:
 >> The following reply was made to PR kern/55699; it has been noted by GNAT=
 S.
 >>
 >> From: Paul Goyette <paul%whooppee.com@localhost>
 >> To: gnats-bugs%netbsd.org@localhost
 >> Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost, netbsd-bugs@netb=
 sd.org,
 >>     joel.bertrand%systella.fr@localhost
 >> Subject: Re: kern/55699: Panic certainly in iSCSI initiator
 >> Date: Wed, 7 Oct 2020 07:04:38 -0700 (PDT)
 >>
 >>  On Wed, 7 Oct 2020, Michael van Elst wrote:
 >>
 >>  <snip>
 >>
 >> > The rip is the same as the fault adress (cr2), which means some
 >> > code should be executed that is no longer in memory. My guess is
 >> > that the usbverbose module is unloaded while in use (which would
 >> > be a bug). A workaround would then be to load that module manually.
 >>
 >>  It might be helpful to set
 >>
 >>   =09sysctl -w kern.module.verbose=3D1
 >>
 >>  to confirm this possibility.
 >>
 >
 > I don't know if I can confirm this possibility.
 >
 > I have removed usbverbose from kernel: modunload usbverbose.
 > No error. Just after, I have set kern.module.verbose=3D1
 >
 > When I start bacula job (and stop to avoid panic...), I obtain on console=
  :
 >
 >
 >
 > [ 10736.911324] DEBUG: module: Loading plist from
 > /stand/amd64/9.0/modules/usbverbose/usbverbose.plist
 > [ 10736.911324] DEBUG: module: plist load returned error 2 for
 > `/stand/amd64/9.0/modules/usbverbose/usbverbose.kmod'
 > [ 10736.921726] DEBUG: module: module `usbverbose' loaded successfully
 > [ 10746.925138] DEBUG: module: unload requested for 'usbverbose' (FALSE)
 > [ 10746.925138] DEBUG: module: unloaded module `usbverbose'
 > [ 10746.965153] DEBUG: module: Loading module from
 > /stand/amd64/9.0/modules/usbverbose/usbverbose.kmod
 > [ 10746.965153] DEBUG: module: Loading plist from
 > /stand/amd64/9.0/modules/usbverbose/usbverbose.plist
 > [ 10746.965153] DEBUG: module: plist load returned error 2 for
 > `/stand/amd64/9.0/modules/usbverbose/usbverbose.kmod'
 > [ 10746.975404] DEBUG: module: module `usbverbose' loaded successfully
 > [ 10753.947813] DEBUG: module: unload requested for 'usbverbose' (TRUE)
 > [ 10753.947813] DEBUG: module: unloaded module `usbverbose'
 > [ 10756.998976] DEBUG: module: Loading module from
 > /stand/amd64/9.0/modules/usbverbose/usbverbose.kmod
 > [ 10756.998976] DEBUG: module: Loading plist from
 > /stand/amd64/9.0/modules/usbverbose/usbverbose.plist
 > [ 10756.998976] DEBUG: module: plist load returned error 2 for
 > `/stand/amd64/9.0/modules/usbverbose/usbverbose.kmod'
 > [ 10757.019631] DEBUG: module: module `usbverbose' loaded successfully
 > [ 10767.012792] DEBUG: module: unload requested for 'usbverbose' (FALSE)
 > [ 10767.012792] DEBUG: module: unloaded module `usbverbose'
 > [ 10767.042803] DEBUG: module: Loading module from
 > /stand/amd64/9.0/modules/usbverbose/usbverbose.kmod
 > [ 10767.042803] DEBUG: module: Loading plist from
 > /stand/amd64/9.0/modules/usbverbose/usbverbose.plist
 > [ 10767.042803] DEBUG: module: plist load returned error 2 for
 > `/stand/amd64/9.0/modules/usbverbose/usbverbose.kmod'
 > [ 10767.052828] DEBUG: module: module `usbverbose' loaded successfully
 > [ 10777.056620] DEBUG: module: unload requested for 'usbverbose' (FALSE)
 > [ 10777.056620] DEBUG: module: unloaded module `usbverbose'
 > [ 10777.076627] DEBUG: module: Loading module from
 > /stand/amd64/9.0/modules/usbverbose/usbverbose.kmod
 > [ 10777.076627] DEBUG: module: Loading plist from
 > /stand/amd64/9.0/modules/usbverbose/usbverbose.plist
 > [ 10777.076627] DEBUG: module: plist load returned error 2 for
 > `/stand/amd64/9.0/modules/usbverbose/usbverbose.kmod'
 > [ 10777.096792] DEBUG: module: module `usbverbose' loaded successfully
 > [ 10787.090445] DEBUG: module: unload requested for 'usbverbose' (FALSE)
 > [ 10787.090445] DEBUG: module: unloaded module `usbverbose'
 > [ 10787.120456] DEBUG: module: Loading module from
 > /stand/amd64/9.0/modules/usbverbose/usbverbose.kmod
 >
 > =09Regards,
 >
 > =09JKB
 >
 > !DSPAM:5f7dd61c75301160512031!
 >
 >
 
 +--------------------+--------------------------+-----------------------+
 | Paul Goyette       | PGP Key fingerprint:     | E-mail addresses:     |
 | (Retired)          | FA29 0E3B 35AF E8AE 6651 | paul%whooppee.com@localhost     |
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 +--------------------+--------------------------+-----------------------+
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