Re: kern/50491: unkillable wait in usbd_transfer while using usmsc0 on raspberry pi 2

[Nick Hudson <skrll%netbsd.org@localhost>]

The following reply was made to PR kern/50491; it has been noted by GNATS.

From: Nick Hudson <skrll%netbsd.org@localhost>
To: gnats-bugs%NetBSD.org@localhost, gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost,
 mfpnb%plass-family.net@localhost
Cc: 
Subject: Re: kern/50491: unkillable wait in usbd_transfer while using usmsc0
 on raspberry pi 2
Date: Fri, 11 Dec 2015 09:05:35 +0000

 On 12/09/15 03:30, Michael Plass wrote:
 > The following reply was made to PR kern/50491; it has been noted by GNATS.
 >
 > From: Michael Plass <mfpnb%plass-family.net@localhost>
 > To: gnats-bugs%NetBSD.org@localhost
 > Cc:
 > Subject: Re: kern/50491: unkillable wait in usbd_transfer while using usmsc0 on raspberry pi 2
 > Date: Tue, 8 Dec 2015 19:27:02 -0800
 >
 >   On Dec 7, 2015, at 9:50 PM, Michael Plass wrote:
 >   
 >   > I'm going to try it using a kernel without LOCKDEBUG
 >   
 >   It looks good! No more unkillable lockups.
 
 Good news.
 
 >   
 >   Maybe related, maybe not:
 >   I did have a dropped tcp connection (ip4, I think). Also, I had a ipv6 =
 >   connection
 >   transferring from the pi to my laptop (inetd/chargen on the pi), and =
 >   that transfer stalled - no data moving, but the connection didn't drop.  =
 >   This happened twice.  The first time I killed the transfer, the other =
 >   one is still in the stuck state.
 >   
 >   The kernel and user stack traces are:
 >   db{0}> bt/a b5ce74a0
 >   trace: pid 4567 lid 1 at 0xb4e2fcdc
 >   0xb4e2fcdc: netbsd:mi_switch+0x10
 >   0xb4e2fd0c: netbsd:sleepq_block+0xb4
 >   0xb4e2fd44: netbsd:cv_timedwait_sig+0x108
 >   0xb4e2fee4: netbsd:kevent1+0x2cc
 >   0xb4e2ff0c: netbsd:sys___kevent50+0x38
 >   0xb4e2ff7c: netbsd:syscall+0x88
 >   0xb4e2ffac: netbsd:swi_handler+0x98
 >   db{0}> cont
 
 Would need some more information about other lwps, I think.
 
 Thanks,
 Nick