Re: port-evbmips/51219: TLB miss panic in in_cksum

[Thor Lancelot Simon <tls%panix.com@localhost>]

The following reply was made to PR port-evbmips/51219; it has been noted by GNATS.

From: Thor Lancelot Simon <tls%panix.com@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: tls%NetBSD.ORG@localhost
Subject: Re: port-evbmips/51219: TLB miss panic in in_cksum
Date: Sun, 5 Jun 2016 19:24:59 -0400

 It can be triggered even more simply:
 	cat /dev/zero | ssh somehost dd of=/dev/null
 
 The trace through ipintr->tcp_input->tcp_output suggests this is triggered
 by sending an ack, I think.
 
 id 0(system): trap: cpu0, TLB miss (load or instr. fetch) in kernel mode
 status=0x80fc83, cause=0x208, epc=0xffffffff8045cb98, vaddr=0xc00000000e5c86a4
 tf=0x9800000410003800 ksp=0x9800000410003940 ra=0xffffffff8025cf38 ppl=0
 kernel: TLB miss (load or instr. fetch) trap
 Stopped in pid 0.3 (system) at  netbsd:cpu_in_cksum+0x128:      lwu
 a6,-60(v
 0)
 db> trace
 0x9800000410003940: cpu_in_cksum+128 (568,30a6616a2,2bad416a2,ee330d06) ra
 fffff
 fff8025cf38 sz 48
 0x9800000410003970: in_delayed_cksum+40 (568,30a6616a2,2bad416a2,ee330d06) ra
 ff
 ffffff8025e760 sz 48
 0x98000004100039a0: ip_output+f68
 (980000000fef3a00,30a6616a2,2bad416a2,ee330d06
 ) ra ffffffff802697d4 sz 192
 0x9800000410003a60: tcp_output+14e4
 (980000000fef3a00,30a6616a2,2bad416a2,ee330d
 06) ra ffffffff80265b90 sz 320
 0x9800000410003ba0: tcp_input+dc0 (980000000fef3a00,14,6,20) ra
 ffffffff8025b8a0
  sz 512
 0x9800000410003da0: ipintr+9f0 (980000000fef3a00,14,6,20) ra ffffffff803a0fc4
 sz
  160
 0x9800000410003e40: softint_dispatch+114 (980000000fef3a00,14,6,20) ra
 ffffffff8
 0200244 sz 96
 0x9800000410003ea0: softint_fast_dispatch+7c (0,14,6,20) ra 0 sz 32
 User-level: pid 0.3