kern/54345: panic: kernel diagnostic assertion "xfer != NULL" in wdc.c

[gson%gson.org@localhost (Andreas Gustafsson)]

>Number:         54345
>Category:       kern
>Synopsis:       panic: kernel diagnostic assertion "xfer != NULL" in wdc.c
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jul 05 18:35:00 +0000 2019
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current
>Organization:

>Environment:
System: NetBSD
Architecture: i386
Machine: i386
>Description:

On the TNF i386 testbed, the qemu guest running the ATF tests has
recently paniced several times with an assertion failure in wdc.c, as
seen by grepping the logs on the testbed (sorry about the long lines):

  babylon5.netbsd.org /bracket/i386/results$ find . -name test.log.gz | xargs zgrep 'xfer != NULL' | grep -v savecore
  ./2019/2019.06.21.14.58.32/test.log.gz:    too_many_args: [ 70855.0868137] panic: kernel diagnostic assertion "xfer != NULL" failed: file "/tmp/bracket/build/2019.06.21.14.58.32-i386/src/sys/dev/ic/wdc.c", line 1342 
  ./2019/2019.06.25.04.25.11/test.log.gz:    ipsec_update_sp_ah_hmacsha512: [ 30591.2890487] panic: kernel diagnostic assertion "xfer != NULL" failed: file "/tmp/bracket/build/2019.06.25.04.25.11-i386/src/sys/dev/ic/wdc.c", line 1342 
  ./2019/2019.06.25.05.04.35/test.log.gz:    ipsec_esp_camelliacbc_valid_keys: [ 23122.7142124] panic: kernel diagnostic assertion "xfer != NULL" failed: file "/tmp/bracket/build/2019.06.25.05.04.35-i386/src/sys/dev/ic/wdc.c", line 1342 
  ./2019/2019.06.25.07.14.45/test.log.gz:    dad_duplicated: [ 15478.1861096] panic: kernel diagnostic assertion "xfer != NULL" failed: file "/tmp/bracket/build/2019.06.25.07.14.45-i386/src/sys/dev/ic/wdc.c", line 1342 
  ./2019/2019.06.25.10.30.29/test.log.gz:    c_comments: [ 7511.6765260] panic: kernel diagnostic assertion "xfer != NULL" failed: file "/tmp/bracket/build/2019.06.25.10.30.29-i386/src/sys/dev/ic/wdc.c", line 1342 
  ./2019/2019.06.25.16.58.02/test.log.gz:    shrink_24M_16M_v0_4096: [ 51100.3032982] panic: kernel diagnostic assertion "xfer != NULL" failed: file "/tmp/bracket/build/2019.06.25.16.58.02-i386/src/sys/dev/ic/wdc.c", line 1342 
  ./2019/2019.07.03.23.10.43/test.log.gz:    traceme_sendsignal_ignored3: [ 9684.6583573] panic: kernel diagnostic assertion "xfer != NULL" failed: file "/tmp/bracket/build/2019.07.03.23.10.43-i386/src/sys/dev/ic/wdc.c", line 1342 
  ./2019/2019.07.04.09.02.24/test.log.gz:    ipsec_tunnel_ipv4_ah_hmacsha1: [ 36364.6862198] panic: kernel diagnostic assertion "xfer != NULL" failed: file "/tmp/bracket/build/2019.07.04.09.02.24-i386/src/sys/dev/ic/wdc.c", line 1342

The logs grepped above go back to 2011, but the message "xfer != NULL"
only appears in the logs from the last couple of weeks, so this looks
very much like a recent regression.
-- 
Andreas Gustafsson, gson%gson.org@localhost

>Fix:

Unknown