Or Gerlitz wrote:
> Hi Erez, Mike,
> 
> testing with 2.6.26-rc2 I get the below nice oops with iser but not with tcp 
> :(
> attached is my compressed .config, also I am using some derivative of 2.0-865,
> so I will move tomorrow to -869 but I wonder if you have any insight for
> this trace. The two warnings on the hwscan program don't seem very nice, 
> thoughts?
> 
> Or.
> 
> # iscsid -v
> iscsid version 2.0-865
> 
> # rpm -qi
> 
> rpm -qi open-iscsi
> Name        : open-iscsi                   Relocations: (not relocatable)
> Version     : 2.0                               Vendor: Voltaire Inc.
> Release     : b4fae5f2fb14aaf7a92ff2f454c74081c552818c   Build Date: Tue Jan 
> 29 11:03:13 2008
> Install date: Tue Jan 29 11:04:58 2008      Build Host: dill.voltaire.com
> Group       : Productivity/Networking/Other   Source RPM: 
> open-iscsi-generic-2.0-b4fae5f2fb14aaf7a92ff2f454c74081c552818c.src.rpm
> Size        : 5645667                          License: GPL
> Signature   : (none)
> Packager    : Erez Zilber <[EMAIL PROTECTED]>
> Summary     : Linux* Open-iSCSI Software Initiator
> 
> 
> ib1: no IPv6 routers present
> Loading iSCSI transport class v2.0-869.
> iscsi: registered transport (tcp)
> iscsi: registered transport (iser)
> iser: iser_connect:connecting to: 192.168.10.55, port 0xbc0c
> iser: iser_cma_handler:event 0 conn ffff81001c91a4d0 id ffff81001c1340d8
> iser: iser_cma_handler:event 2 conn ffff81001c91a4d0 id ffff81001c1340d8
> iser: iser_create_ib_conn_res:setting conn ffff81001c91a4d0 cma_id 
> ffff81001c1340d8: fmr_pool ffff81002db6b470 qp ffff8100300a86e0
> iser: iser_cma_handler:event 9 conn ffff81001c91a4d0 id ffff81001c1340d8
> iser: iscsi_iser_ep_poll:ib conn ffff81001c91a4d0 rc = 1
> scsi0 : iSCSI Initiator over iSER, v.0.1
> iser: iscsi_iser_conn_bind:binding iscsi conn ffff810010c08f08 to iser_conn 
> ffff81001c91a4d0
> scsi 0:0:0:0: Direct-Access     vendor   vendor DISK      v1.0 PQ: 0 ANSI: 4
> sd 0:0:0:0: [sda] 34789376 512-byte hardware sectors (17812 MB)
> sd 0:0:0:0: [sda] Write Protect is off
> sd 0:0:0:0: [sda] Mode Sense: 99 00 10 08
> sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, supports DPO 
> and FUA
> sd 0:0:0:0: [sda] 34789376 512-byte hardware sectors (17812 MB)
> sd 0:0:0:0: [sda] Write Protect is off
> sd 0:0:0:0: [sda] Mode Sense: 99 00 10 08
> sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, supports DPO 
> and FUA
>  sda: unknown partition table
> sd 0:0:0:0: [sda] Attached SCSI disk
> sd 0:0:0:0: Attached scsi generic sg0 type 0
> Program hwscan tried to access /dev/mem between f9000->10a000.
> program hwscan is using a deprecated SCSI ioctl, please convert it to SG_IO
> BUG: unable to handle kernel NULL pointer dereference at 0000000000000698
> IP: [<ffffffff8025a91a>] get_page_from_freelist+0x60/0x594
> PGD dd3b067 PUD 1c166067 PMD 0
> Oops: 0000 [1] SMP
> CPU 1
> Modules linked in: ib_iser rdma_cm iw_cm ib_addr iscsi_tcp libiscsi 
> scsi_transport_iscsi ib_ipoib ib_cm ib_sa ipv6 sg st sd_mod sr_mod scsi_mod 
> ib_mthca ib_mad ib_core e100 i2c_amd756 i2c_amd8111 i2c_core
> Pid: 16520, comm: hwscan Not tainted 2.6.26-rc2 #3
> RIP: 0010:[<ffffffff8025a91a>]  [<ffffffff8025a91a>] 
> get_page_from_freelist+0x60/0x594
> RSP: 0018:ffff81002f96d918  EFLAGS: 00010282
> RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff81002f96d970
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff810020002e68
> RBP: 00000000000692d1 R08: 0000000000000000 R09: 0000000000000044
> R10: 0000000000000000 R11: 0000000000000246 R12: ffff810020002e48
> R13: ffff810020002e40 R14: 0000000000000000 R15: 0000000000000000
> FS:  00007f205a7054c0(0000) GS:ffff81003f917d58(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 0000000000000698 CR3: 0000000012814000 CR4: 00000000000006e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Process hwscan (pid: 16520, threadinfo ffff81002f96c000, task 
> ffff81002b165100)
> Stack:  0000000000000000 ffff81002f96d948 0000000000000000 0000000000000000
>  0000000000000000 ffffffff8022683d 0000000000000044 ffff810020002e40
>  0000000000000000 000612d180227482 0000000000000002 0000000000000000
> Call Trace:
>  [<ffffffff8022683d>] ? __resched_task+0x64/0x66
>  [<ffffffff8025afaf>] ? __alloc_pages_internal+0xab/0x3cd
>  [<ffffffff802794f5>] ? kmem_getpages+0x99/0x149
>  [<ffffffff80279952>] ? cache_grow+0x9c/0x33d
>  [<ffffffff80279e60>] ? cache_alloc_refill+0x26d/0x2b9
>  [<ffffffff803217fd>] ? sg_scsi_ioctl+0xd4/0x2e9
>  [<ffffffff8027a2fe>] ? __kmalloc+0xe7/0x179
>  [<ffffffff803217fd>] ? sg_scsi_ioctl+0xd4/0x2e9
>  [<ffffffffa0057b06>] ? :scsi_mod:scsi_request_fn+0x346/0x363
>  [<ffffffff80255475>] ? sync_page+0x0/0x45
>  [<ffffffff80321dbb>] ? scsi_cmd_ioctl+0x3a9/0x3ee
>  [<ffffffff80255464>] ? __lock_page+0x7d/0x83
>  [<ffffffff802407cd>] ? wake_bit_function+0x0/0x23
>  [<ffffffff802557a4>] ? add_to_page_cache+0x6f/0x84
>  [<ffffffff802407cd>] ? wake_bit_function+0x0/0x23
>  [<ffffffff80278306>] ? poison_obj+0x35/0x43
>  [<ffffffff802784fa>] ? cache_free_debugcheck+0x1e6/0x1f5
>  [<ffffffffa0080771>] ? :sd_mod:sd_ioctl+0x95/0xc3
>  [<ffffffff8031f738>] ? blkdev_driver_ioctl+0x54/0x66
>  [<ffffffff8031fe99>] ? blkdev_ioctl+0x744/0x75b
>  [<ffffffff802a236c>] ? blkdev_open+0x0/0x5b
>  [<ffffffff802a2399>] ? blkdev_open+0x2d/0x5b
>  [<ffffffff8027d1dd>] ? __dentry_open+0x14b/0x234
>  [<ffffffff8027d36b>] ? nameidata_to_filp+0x26/0x35
>  [<ffffffff80287b2d>] ? do_filp_open+0x392/0x759
>  [<ffffffff802a17cf>] ? block_ioctl+0x18/0x1d
>  [<ffffffff802895f9>] ? vfs_ioctl+0x29/0x6f
>  [<ffffffff8028989c>] ? do_vfs_ioctl+0x25d/0x26c
>  [<ffffffff802898e7>] ? sys_ioctl+0x3c/0x61
>  [<ffffffff8020b17b>] ? system_call_after_swapgs+0x7b/0x80
> 
> 
> Code: 44 24 34 44 89 4c 24 30 48 c7 44 24 18 00 00 00 00 c7 44 24 14 00 00 00 
> 00 c7 44 24 10 00 00 00 00 e8 5f 5d 00 00 48 8b 44 24 58 <48> 2b 80 98 06 00 
> 00 48 c1 f8 08 69 c0 b7 6d db b6 89 44 24 24
> RIP  [<ffffffff8025a91a>] get_page_from_freelist+0x60/0x594
>  RSP <ffff81002f96d918>
> CR2: 0000000000000698
> ---[ end trace 91fc8fbfba7644e6 ]---

I have not seen it before. You might want to report to linux-scsi or 
lkml if it is regression between mainline kernels. I do not think iser 
has come into play in the trace. We are just setting up the sg io open/IO.

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