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Message #135482
[Bug 1496989] [NEW] ISST-LTE: system crashes at lpfc_sli4_scmd_to_wqidx_distr
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-- Problem Description --
We have Ubuntu 15.10 installed on our system and run stress test for around 24 hrs then it crashes at lpfc_sli4_scmd_to_wqidx_distr+0x30/0x100
0:mon> e
cpu 0x0: Vector: 300 (Data Access) at [c00000000a0575a0]
pc: d000000003115b30: lpfc_sli4_scmd_to_wqidx_distr+0x30/0x100 [lpfc]
lr: d0000000030b749c: lpfc_sli_calc_ring.part.20+0xdc/0x100 [lpfc]
sp: c00000000a057820
msr: 8000000100009033
dar: 0
dsisr: 40000000
current = 0xc000000272dbbcf0
paca = 0xc00000000e7f0000 softe: 0 irq_happened: 0x01
pid = 246, comm = scsi_eh_0
0:mon> t
[c00000000a057850] d0000000030b749c lpfc_sli_calc_ring.part.20+0xdc/0x100 [lpfc]
[c00000000a057890] d0000000030bf680 lpfc_sli_issue_iocb+0xf0/0x320 [lpfc]
[c00000000a0578f0] d0000000030c3804 lpfc_sli_issue_iocb_wait+0x264/0x680 [lpfc]
[c00000000a0579d0] d000000003110fd4 lpfc_send_taskmgmt+0x2d4/0x7d0 [lpfc]
[c00000000a057aa0] d000000003111bf4 lpfc_device_reset_handler+0x114/0x210 [lpfc]
[c00000000a057b60] c00000000071254c scsi_eh_ready_devs+0x68c/0xee0
[c00000000a057c50] c00000000071474c scsi_error_handler+0x6ac/0x9e0
[c00000000a057d80] c0000000000e1e20 kthread+0x110/0x130
[c00000000a057e30] c000000000009530 ret_from_kernel_thread+0x5c/0xac
0:mon> di d000000003115b30
d000000003115b30 e92a0000 ld r9,0(r10)
d000000003115b34 e9290000 ld r9,0(r9)
d000000003115b38 e92901a8 ld r9,424(r9)
d000000003115b3c 7928b7e3 rldicl. r8,r9,54,63
d000000003115b40 40820090 bne d000000003115bd0 # lpfc_sli4_scmd_to_wqidx_distr+0xd0/0x100 [lpfc]
d000000003115b44 813f0ae0 lwz r9,2784(r31)
d000000003115b48 2f890001 cmpwi cr7,r9,1
d000000003115b4c 419e0054 beq cr7,d000000003115ba0 # lpfc_sli4_scmd_to_wqidx_distr+0xa0/0x100 [lpfc]
d000000003115b50 395f0d58 addi r10,r31,3416
d000000003115b54 39200001 li r9,1
d000000003115b58 7c2004ac lwsync
d000000003115b5c 7c605028 lwarx r3,0,r10
d000000003115b60 7c691a14 add r3,r9,r3
d000000003115b64 7c60512d stwcx. r3,0,r10
d000000003115b68 40c2fff4 bne- d000000003115b5c # lpfc_sli4_scmd_to_wqidx_distr+0x5c/0x100 [lpfc]
d000000003115b6c 7c0004ac sync
0:mon> d c000000000ab00e0
c000000000ab00e0 4c696e7578207665 7273696f6e20342e |Linux version 4.|
c000000000ab00f0 322e302d372d6765 6e65726963202862 |2.0-7-generic (b|
c000000000ab0100 75696c6464406465 6e6e656564303429 |uildd@denneed04)|
c000000000ab0110 2028676363207665 7273696f6e20352e | (gcc version 5.|
lpfc_sli4_scmd_to_wqidx_distr() got moved around and changed a bit to
lpfc_scsi.c with commit 8b0dff14164d3f43eba8365950b506d898e0e1e6 and the
crash appears to be due to an invalid address of 0x0 for struct
scsi_cmnd *cmnd
3860 int lpfc_sli4_scmd_to_wqidx_distr(struct lpfc_hba *phba,
3861 struct lpfc_scsi_buf *lpfc_cmd)
3862 {
3863 struct scsi_cmnd *cmnd = lpfc_cmd->pCmd;
3864 struct lpfc_vector_map_info *cpup;
3865 int chann, cpu;
3866 uint32_t tag;
3867 uint16_t hwq;
3868
3869 if (shost_use_blk_mq(cmnd->device->host)) {
3870 tag = blk_mq_unique_tag(cmnd->request);
3871 hwq = blk_mq_unique_tag_to_hwq(tag);
3872
3873 return hwq;
3874 }
0:mon> r
R00 = d0000000030b749c R16 = c00000000a057cd0
R01 = c00000000a057820 R17 = c00000000a057cb8
R02 = d000000003163d28 R18 = c00000000a52a088
R03 = c00000027e9fe000 R19 = c00000000a057cb0
R04 = c00000027139a400 R20 = 000000000000001e
R05 = c00000027139a470 R21 = 0000000000000001
R06 = 0000000000000001 R22 = c00000000180c268
R07 = d000000003163d28 R23 = c00000027139a470
R08 = d00000000310de90 R24 = c00000027139a400
R09 = 0000000000000004 R25 = c00000000a057978
R10 = 0000000000000000 R26 = 0000000000000001
R11 = d000000003137e20 R27 = 0000000000000000
R12 = 0000000028641824 R28 = c00000000a528000
R13 = c00000000e7f0000 R29 = c00000027e9fe000
R14 = c00000000a057cb8 R30 = c00000027139a400
R15 = 0000000000000000 R31 = c00000027e9fe000
pc = d000000003115b30 lpfc_sli4_scmd_to_wqidx_distr+0x30/0x100 [lpfc]
cfar= c000000000008468 slb_miss_realmode+0x50/0x78
lr = d0000000030b749c lpfc_sli_calc_ring.part.20+0xdc/0x100 [lpfc]
msr = 8000000100009033 cr = 28648828
ctr = c000000000a95a70 xer = 0000000020000000 trap = 300
dar = 0000000000000000 dsisr = 40000000
0:mon> di $lpfc_sli4_scmd_to_wqidx_distr
d000000003115b00 3c4c0005 addis r2,r12,5
d000000003115b04 3842e228 addi r2,r2,-7640
d000000003115b08 7c0802a6 mflr r0
d000000003115b0c fbc1fff0 std r30,-16(r1)
d000000003115b10 fbe1fff8 std r31,-8(r1)
d000000003115b14 f8010010 std r0,16(r1)
d000000003115b18 f821ffd1 stdu r1,-48(r1)
d000000003115b1c 7c9e2378 mr r30,r4
d000000003115b20 7c7f1b78 mr r31,r3
d000000003115b24 48000008 b d000000003115b2c # lpfc_sli4_scmd_to_wqidx_distr+0x2c/0x100 [lpfc]
d000000003115b28 e8410018 ld r2,24(r1)
d000000003115b2c e95e0010 ld r10,16(r30)
d000000003115b30 e92a0000 ld r9,0(r10)
d000000003115b34 e9290000 ld r9,0(r9)
d000000003115b38 e92901a8 ld r9,424(r9)
d000000003115b3c 7928b7e3 rldicl. r8,r9,54,63
0:mon> d c00000027139a400
c00000027139a400 0001100000000000 0002200000000000 |.......... .....|
c00000027139a410 0000000000000000 a8649972020000c0 |.........d.r....|
c00000027139a420 3c00000000000000 0000000000000000 |<...............|
c00000027139a430 0000000000000000 0000000000000000 |................|
0:mon>
There were some I/O errors and failed paths before the kernel faults...
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Taco Screen team (taco-screen-team)
Status: New
** Tags: architecture-ppc64le bot-comment bugnameltc-130686 severity-high targetmilestone-inin1510
--
ISST-LTE: system crashes at lpfc_sli4_scmd_to_wqidx_distr
https://bugs.launchpad.net/bugs/1496989
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