Sounds like a problem I so a couple of months ago, I thought the fix was already in
the CVS.
Here is my previous mail:
There seems to be a hazard problem in the local_flush_tlb_range function
in tlb-r4k.c, which the patch below will fix.
It could hit anyone, but it probably only a problem on CPUs, which
doesn't allow matching entries in the TLB.
/Carsten
Index: arch/mips/mm/tlb-r4k.c
===================================================================
RCS file: /cvs/linux/arch/mips/mm/tlb-r4k.c,v
retrieving revision 1.6.2.3
diff -u -r1.6.2.3 tlb-r4k.c
--- arch/mips/mm/tlb-r4k.c 2002/01/18 03:16:24 1.6.2.3
+++ arch/mips/mm/tlb-r4k.c 2002/05/17 11:36:58
@@ -119,12 +119,11 @@
idx = get_index();
set_entrylo0(0);
set_entrylo1(0);
- set_entryhi(KSEG0);
if (idx < 0)
continue;
- BARRIER;
/* Make sure all entries differ. */
set_entryhi(KSEG0+idx*0x2000);
+ BARRIER;
tlb_write_indexed();
BARRIER;
}
Jun Sun wrote:
> See the crash scene. Anybody knows the cause? It is strange to see the
> reserved exception.
>
> Jun
>
> FDC 0 is a post-1991 82077
> RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
> pcnet32.c:v1.27a 10.02.2002 tsbogend@alpha.franken.de
> pcnet32: PCnet/FAST III 79C973 at 0x1200, 00 d0 a0 00 01 e7 assigned IRQ 10.
> eth0: registered as PCnet/FAST III 79C973
> pcnet32: 1 cards_found.
> SCSI subsystem driver Revision: 1.00
> NET4: Linux TCP/IP 1.0 for NET4.0
> IP Protocols: ICMP, UDP, TCP
> IP: routing cache hash table of 512 buckets, 4Kbytes
> TCP: Hash tables configured (established 4096 bind 4096)
> Sending BOOTP requests . OK
> IP-Config: Got BOOTP answer from 10.0.0.75, my address is 10.0.18.6
> IP-Config: Complete:
> device=eth0, addr=10.0.18.6, mask=255.255.0.0, gw=255.255.255.255,
> host=10.0.18.6, domain=, nis-domain=(none),
> bootserver=10.0.0.75, rootserver=10.0.0.75, rootpath=/opt/mvl-installs/mvl2
> .1/hardhat/devkit/mips/fp_le/target
> NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
> Looking up port of RPC 100003/2 on 10.0.0.75
> Looking up port of RPC 100005/1 on 10.0.0.75
> VFS: Mounted root (nfs filesystem).
> Freeing prom memory: 956kb freed
> Freeing unused kernel memory: 84k freed
> Algorithmics/MIPS FPU Emulator v1.5
> INIT: version 2.78 booting
> $0 : 00000000 80000000 80002000 00000006 00000006 0040c000 0040c000 00000001
> $8 : 80000000 00000034 8004bde8 8004bbf0 8004bde8 00000080 8004baf8 00000001
> $16: 00800000 800071c0 1000fc01 8004c008 0000b000 8004c008 00800000 0040b000
> $24: 00000000 00000080 8004a000 8004ba78 0000000b 8011db6c
> Hi : ffffe4f4
> Lo : 00000904
> epc : 8010d528 Not tainted
> Status: 1020fc02
> Cause : 00800060
> Kernel panic: Caught reserved exception - should not happen.
>
> ==========================================================ffffffff8010d490:
> 92240080 lbu $a0,128($s1)
> ffffffff8010d494: 3c088000 lui $t0,0x8000
> ffffffff8010d498: 00a41025 or $v0,$a1,$a0
> ffffffff8010d49c: 40825000 mtc0 $v0,$10
> ffffffff8010d4a0: 24a52000 addiu $a1,$a1,8192
> ...
> ffffffff8010d4bc: 42000008 tlbp
> ...
> ffffffff8010d4d8: 40070000 mfc0 $a3,$0
> ffffffff8010d4dc: 00000000 nop
> ffffffff8010d4e0: 00e01021 move $v0,$a3
> ffffffff8010d4e4: 40801000 mtc0 $zero,$2
> ffffffff8010d4e8: 00000000 nop
> ffffffff8010d4ec: 40801800 mtc0 $zero,$3
> ffffffff8010d4f0: 00000000 nop
> ffffffff8010d4f4: 40885000 mtc0 $t0,$10
> ffffffff8010d4f8: 04400013 bltz $v0,ffffffff8010d548 <local_flus
> h_tlb_range+0x150>
> ffffffff8010d4fc: 00a6102b sltu $v0,$a1,$a2
> ...
> ffffffff8010d518: 00071340 sll $v0,$a3,0xd
> ffffffff8010d51c: 3c018000 lui $at,0x8000
> ffffffff8010d520: 00221021 addu $v0,$at,$v0
> ffffffff8010d524: 40825000 mtc0 $v0,$10
> ffffffff8010d528: 42000002 tlbwi
> ...
> ffffffff8010d544: 00a6102b sltu $v0,$a1,$a2
> ffffffff8010d548: 1440ffd4 bnez $v0,ffffffff8010d49c <local_flus
> h_tlb_range+0xa4>
> ffffffff8010d54c: 00a41025 or $v0,$a1,$a0
> ffffffff8010d550: 40835000 mtc0 $v1,$10
> ffffffff8010d554: 08043569 j ffffffff8010d5a4 <local_flush_tl
> b_range+0x1ac>
> ffffffff8010d558: 00000000 nop
> ffffffff8010d55c: 3c108025 lui $s0,0x8025
> ffffffff8010d560: 8e105910 lw $s0,22800($s0)
> ffffffff8010d564: 26100001 addiu $s0,$s0,1
> ffffffff8010d568: 320200ff andi $v0,$s0,0xff
> ffffffff8010d56c: 14400005 bnez $v0,ffffffff8010d584 <local_flus
> h_tlb_range+0x18c>
> ffffffff8010d570: 00000000 nop
--
_ _ ____ ___ Carsten Langgaard Mailto:carstenl@mips.com
|\ /|||___)(___ MIPS Denmark Direct: +45 4486 5527
| \/ ||| ____) Lautrupvang 4B Switch: +45 4486 5555
TECHNOLOGIES 2750 Ballerup Fax...: +45 4486 5556
Denmark http://www.mips.com
