Hi,
2.6.28-git4 kernel drops to xmon with kernel expection. Similar kernel
expection was seen next-20081230 and next-20081231 and was reported
earlier at http://lkml.org/lkml/2008/12/31/157
1:mon> e
cpu 0x1: Vector: 300 (Data Access) at [c0000002763cb700]
pc: c0000000000e2c54: .kmem_cache_free+0x1b8/0x244
lr: c00000000005ab04: .__cleanup_sighand+0x44/0x5c
sp: c0000002763cb980
msr: 9000000000009032
dar: 0
dsisr: 40000000
current = 0xc0000002763c5180
paca = 0xc000000000548500
pid = 6, comm = ksoftirqd/1
1:mon> t
[c0000002763cba30] c00000000005ab04 .__cleanup_sighand+0x44/0x5c
[c0000002763cbab0] c00000000006080c .release_task+0x2dc/0x400
[c0000002763cbb50] c0000000000610dc .do_exit+0x7ac/0x858
[c0000002763cbc20] c00000000006128c .complete_and_exit+0x0/0x2c
[c0000002763cbca0] c00000000000852c syscall_exit+0x0/0x40
--- Exception: c01 (System Call) at c00000000002472c .kernel_thread+0x60/0x70
1:mon>
c0000000000e2cec fbe1fff8 std r31,-8(r1)
c0000000000e2cf0 ebc2b260 ld r30,-19872(r2)
c0000000000e2cf4 7c9f2378 mr r31,r4
c0000000000e2cf8 f8010010 std r0,16(r1)
c0000000000e2cfc f821ff71 stdu r1,-144(r1)
c0000000000e2d00 7c7d1b78 mr r29,r3
c0000000000e2d04 60000000 nop
c0000000000e2d08 81630114 lwz r11,276(r3)
c0000000000e2d0c e9240018 ld r9,24(r4)
c0000000000e2d10 e8040010 ld r0,16(r4)
c0000000000e2d14 796a6fe3 rldicl. r10,r11,45,63
c0000000000e2d18 7d204850 subf r9,r0,r9
c0000000000e2d1c 7d244b78 mr r4,r9
1:mon> di c0000000000e2c54
c0000000000e2c54 817f0000 lwz r11,0(r31)
c0000000000e2c58 801f0004 lwz r0,4(r31)
c0000000000e2c5c 7f8b0040 cmplw cr7,r11,r0
c0000000000e2c60 409c001c bge cr7,c0000000000e2c7c #
.kmem_cache_free+0x1e0/0x244
c0000000000e2c64 79691f24 rldicr r9,r11,3,60
c0000000000e2c68 380b0001 addi r0,r11,1
c0000000000e2c6c 7d29fa14 add r9,r9,r31
c0000000000e2c70 901f0000 stw r0,0(r31)
c0000000000e2c74 fba90018 std r29,24(r9)
c0000000000e2c78 48000028 b c0000000000e2ca0 #
.kmem_cache_free+0x204/0x244
c0000000000e2c7c 7f63db78 mr r3,r27
c0000000000e2c80 7fe4fb78 mr r4,r31
c0000000000e2c84 480005a5 bl c0000000000e3228 #
.cache_flusharray+0x0/0x150
1:mon> di %pc
c0000000000e2c54 817f0000 lwz r11,0(r31)
c0000000000e2c58 801f0004 lwz r0,4(r31)
c0000000000e2c5c 7f8b0040 cmplw cr7,r11,r0
c0000000000e2c60 409c001c bge cr7,c0000000000e2c7c #
.kmem_cache_free+0x1e0/0x244
c0000000000e2c64 79691f24 rldicr r9,r11,3,60
c0000000000e2c68 380b0001 addi r0,r11,1
c0000000000e2c6c 7d29fa14 add r9,r9,r31
c0000000000e2c70 901f0000 stw r0,0(r31)
c0000000000e2c74 fba90018 std r29,24(r9)
c0000000000e2c78 48000028 b c0000000000e2ca0 #
.kmem_cache_free+0x204/0x244
c0000000000e2c7c 7f63db78 mr r3,r27
c0000000000e2c80 7fe4fb78 mr r4,r31
c0000000000e2c84 480005a5 bl c0000000000e3228 #
.cache_flusharray+0x0/0x150
1:mon> di %lr
c00000000005ab04 60000000 nop
c00000000005ab08 38210080 addi r1,r1,128
c00000000005ab0c e8010010 ld r0,16(r1)
c00000000005ab10 ebc1fff0 ld r30,-16(r1)
c00000000005ab14 7c0803a6 mtlr r0
c00000000005ab18 4e800020 blr
c00000000005ab1c 7c0802a6 mflr r0
c00000000005ab20 fb81ffe0 std r28,-32(r1)
c00000000005ab24 fbe1fff8 std r31,-8(r1)
c00000000005ab28 fba1ffe8 std r29,-24(r1)
c00000000005ab2c 7c7f1b78 mr r31,r3
c00000000005ab30 f8010010 std r0,16(r1)
c00000000005ab34 f821ff71 stdu r1,-144(r1)
1:mon> di $.kmem_cache_free
c0000000000e2a9c 7c0802a6 mflr r0
c0000000000e2aa0 fb61ffd8 std r27,-40(r1)
c0000000000e2aa4 fba1ffe8 std r29,-24(r1)
c0000000000e2aa8 fbc1fff0 std r30,-16(r1)
c0000000000e2aac fb41ffd0 std r26,-48(r1)
c0000000000e2ab0 fb81ffe0 std r28,-32(r1)
c0000000000e2ab4 fbe1fff8 std r31,-8(r1)
c0000000000e2ab8 f8010010 std r0,16(r1)
c0000000000e2abc ebc2b260 ld r30,-19872(r2)
c0000000000e2ac0 f821ff51 stdu r1,-176(r1)
c0000000000e2ac4 7c7b1b78 mr r27,r3
c0000000000e2ac8 7c9d2378 mr r29,r4
c0000000000e2acc 38000000 li r0,0
1:mon> ls .kmem_cache_free
.kmem_cache_free: c0000000000e2a9c
1:mon> di c0000000000e2a9c+1b8
c0000000000e2a9c 7c0802a6 mflr r0
c0000000000e2aa0 fb61ffd8 std r27,-40(r1)
c0000000000e2aa4 fba1ffe8 std r29,-24(r1)
c0000000000e2aa8 fbc1fff0 std r30,-16(r1)
c0000000000e2aac fb41ffd0 std r26,-48(r1)
c0000000000e2ab0 fb81ffe0 std r28,-32(r1)
c0000000000e2ab4 fbe1fff8 std r31,-8(r1)
c0000000000e2ab8 f8010010 std r0,16(r1)
c0000000000e2abc ebc2b260 ld r30,-19872(r2)
c0000000000e2ac0 f821ff51 stdu r1,-176(r1)
c0000000000e2ac4 7c7b1b78 mr r27,r3
c0000000000e2ac8 7c9d2378 mr r29,r4
c0000000000e2acc 38000000 li r0,0
c0000000000e2ad0 8b4d01da lbz r26,474(r13)
c0000000000e2ad4 980d01da stb r0,474(r13)
c0000000000e2ad8 e93e8110 ld r9,-32496(r30)
c0000000000e2adc a00d000a lhz r0,10(r13)
c0000000000e2ae0 7daa6b78 mr r10,r13
c0000000000e2ae4 81290000 lwz r9,0(r9)
c0000000000e2ae8 78001f24 rldicr r0,r0,3,60
c0000000000e2aec 7fe3002a ldx r31,r3,r0
c0000000000e2af0 2f890000 cmpwi cr7,r9,0
c0000000000e2af4 419e0160 beq cr7,c0000000000e2c54 #
.kmem_cache_free+0x1b8/0x244
c0000000000e2af8 3d204000 lis r9,16384
c0000000000e2afc f8810070 std r4,112(r1)
c0000000000e2b00 38000038 li r0,56
c0000000000e2b04 3960ffff li r11,-1
c0000000000e2b08 792907c6 rldicr r9,r9,32,31
c0000000000e2b0c 796b00c4 rldicr r11,r11,0,3
c0000000000e2b10 7d244a14 add r9,r4,r9
c0000000000e2b14 7929a302 rldicl r9,r9,52,12
c0000000000e2b18 7d2901d2 mulld r9,r9,r0
c0000000000e2b1c 7c09582a ldx r0,r9,r11
c0000000000e2b20 7d695a14 add r11,r9,r11
c0000000000e2b24 780997e3 rldicl. r9,r0,50,63
c0000000000e2b28 41a20008 beq c0000000000e2b30 #
.kmem_cache_free+0x94/0x244
c0000000000e2b2c e96b0010 ld r11,16(r11)
c0000000000e2b30 e80b0000 ld r0,0(r11)
c0000000000e2b34 68000080 xori r0,r0,128
c0000000000e2b38 7800cfe2 rldicl r0,r0,57,63
c0000000000e2b3c 0b000000 tdnei r0,0
c0000000000e2b40 a00a000a lhz r0,10(r10)
c0000000000e2b44 e93e8028 ld r9,-32728(r30)
c0000000000e2b48 e96b0030 ld r11,48(r11)
c0000000000e2b4c 78001764 rldicr r0,r0,2,61
c0000000000e2b50 a38b0028 lhz r28,40(r11)
c0000000000e2b54 7d2902aa lwax r9,r9,r0
c0000000000e2b58 7f9c4800 cmpw cr7,r28,r9
c0000000000e2b5c 41be00f8 beq cr7,c0000000000e2c54 #
.kmem_cache_free+0x1b8/0x244
c0000000000e2b60 79291f24 rldicr r9,r9,3,60
c0000000000e2b64 7d29da14 add r9,r9,r27
c0000000000e2b68 e9290168 ld r9,360(r9)
c0000000000e2b6c e8690050 ld r3,80(r9)
c0000000000e2b70 2fa30000 cmpdi cr7,r3,0
c0000000000e2b74 419e0088 beq cr7,c0000000000e2bfc #
.kmem_cache_free+0x160/0x244
c0000000000e2b78 7b891f24 rldicr r9,r28,3,60
c0000000000e2b7c 7fa3482a ldx r29,r3,r9
c0000000000e2b80 2fbd0000 cmpdi cr7,r29,0
c0000000000e2b84 419e0078 beq cr7,c0000000000e2bfc #
.kmem_cache_free+0x160/0x244
c0000000000e2b88 387d0010 addi r3,r29,16
c0000000000e2b8c 4823eb5d bl c0000000003216e8 #
._spin_lock+0x0/0x88
c0000000000e2b90 60000000 nop
c0000000000e2b94 801d0000 lwz r0,0(r29)
c0000000000e2b98 813d0004 lwz r9,4(r29)
c0000000000e2b9c 7f804840 cmplw cr7,r0,r9
c0000000000e2ba0 40be0014 bne cr7,c0000000000e2bb4 #
.kmem_cache_free+0x118/0x244
c0000000000e2ba4 7f63db78 mr r3,r27
--
Thanks & Regards,
Kamalesh Babulal,
Linux Technology Center,
IBM, ISTL.
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