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    SubjectRe: Linux 2.6.37-rc1 (scsi_debug: list corruption)


    [ 102.555847] calling scsi_debug_init+0x0/0x704 [scsi_debug] @ 3337
    Nov 3 16:06:12 control kernel: [ 102.555847] calling scsi_deb[ 102.622974] scsi_debug: host protection
    [ 102.627513] scsi4 : scsi_debug, version 1.82 [20100324], dev_size_mb=8, opts=0x0
    Nov 3 16:06:13 control kernel: [ 102.639095] initcall scsi_debug_init+0x0/0x704 [scsi_debug] returned 0 after 75039 usecs
    Nov 3 16:06:13 [ 102.651072] ------------[ cut here ]------------
    [ 102.657373] WARNING: at /local/linsrc/lnx-2637-rc1/lib/list_debug.c:26 __list_add+0x4d/0xa5()
    [ 102.666012] Hardware name: OptiPlex GX620
    [ 102.671396] list_add corruption. next->prev should be prev (ffffffff81ae5e50), but was 6b6b6b6b6b6b6b6b. (next=ffff88006c880590).
    [ 102.683509] Modules linked in: scsi_debug ipt_MASQUERADE iptable_nat nf_nat af_packet nfsd lockd nfs_acl auth_rpcgss exportfs sco bridge stp llc bnep l2cap crc16 bluetooth rfkill sunrpc ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 iptable_filter ip_tables ip6t_REJECT xt_tcpudp nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_conntrack ip6table_filter ip6_tables x_tables ipv6 p4_clockmod freq_table speedstep_lib binfmt_misc dm_mirror dm_region_hash dm_log dm_multipath scsi_dh dm_mod kvm uinput mousedev joydev ppdev snd_intel8x0 snd_ac97_codec ac97_bus snd_seq snd_seq_device usbkbd snd_pcm usbmouse led_class snd_timer usbhid iTCO_wdt hid tg3 snd sr_mod iTCO_vendor_support dcdbas cdrom pcspkr i2c_i801 sg soundcore rtc_cmos parport_pc rng_core evdev snd_page_alloc shpchp rtc_core parport rtc_lib mac_hid 8250_pnp pci_hotplug unix ide_pci_generic ide_core ata_generic pata_acpi ata_piix sd_mod crc_t10dif ext3 jbd mbcache uhci_hcd ohci_hcd ssb mmc_core pcmcia pcmcia_core firmware_clas!
    s ehci_hcd usbcore nls_base i915 drm_kms_helper intel_agp button intel_gtt video thermal_sys hwmon output [last unloaded: mperf]
    [ 102.787884] Pid: 3349, comm: scsi_scan_4 Not tainted 2.6.37-rc1 #10
    [ 102.794602] Call Trace:
    [ 102.797152] [<ffffffff8107e1ed>] warn_slowpath_common+0xc6/0xf3
    [ 102.803270] [<ffffffff812d3582>] ? __percpu_counter_init+0x9e/0xdf
    [ 102.809973] [<ffffffff8107e30a>] warn_slowpath_fmt+0x5b/0x6b
    [ 102.815846] [<ffffffff812cf38b>] __list_add+0x4d/0xa5
    Nov 3 16:06:13 [ 102.821109] [<ffffffff812d359f>] __percpu_counter_init+0xbb/0xdf
    control kernel: [ 102.829046] [<ffffffff8117c577>] bdi_init+0x13f/0x1c2
    [ 102.651072] -[ 102.835171] [<ffffffff81411c7c>] ? scsi_request_fn+0x0/0x6f4
    -----------[ cut[ 102.842260] [<ffffffff81411c7c>] ? scsi_request_fn+0x0/0x6f4
    here ]---------[ 102.849903] [<ffffffff812a7444>] blk_alloc_queue_node+0x8f/0x220
    ---
    Nov 3 16:06[ 102.856915] [<ffffffff812a773b>] blk_init_queue_node+0x30/0x90
    :13 control kern[ 102.864592] [<ffffffff812a77b3>] blk_init_queue+0x18/0x21
    el: [ 102.65737[ 102.871037] [<ffffffff8141239d>] __scsi_alloc_queue+0x2d/0x207
    [ 102.878377] [<ffffffff8141259b>] scsi_alloc_queue+0x24/0x9c
    Nov 3 16:06:13 [ 102.884579] [<ffffffff81414f27>] scsi_alloc_sdev+0x1de/0x31d
    control kernel: [ 102.891302] [<ffffffff814162bb>] scsi_probe_and_add_lun+0x191/0x615
    [ 102.671396] l[ 102.899044] [<ffffffff813f9cde>] ? attribute_container_add_device+0x258/0x26e
    ist_add corrupti[ 102.908167] [<ffffffff813eedda>] ? get_device+0x1e/0x36
    on. next->prev s[ 102.914335] [<ffffffff81414c3b>] ? scsi_alloc_target+0x2d9/0x33e
    hould be prev (f[ 102.922209] [<ffffffff814173c5>] ? scsi_scan_host_selected+0xec/0x1a7
    fffffff81ae5e50)[ 102.929769] [<ffffffff814173c5>] ? scsi_scan_host_selected+0xec/0x1a7
    , but was 6b6b6b[ 102.938062] [<ffffffff8141708b>] __scsi_scan_target+0xbe/0x25c
    6b6b6b6b6b. (nex[ 102.944996] [<ffffffff8141729c>] scsi_scan_channel+0x73/0xb0
    t=ffff88006c8805[ 102.952467] [<ffffffff8141742b>] scsi_scan_host_selected+0x152/0x1a7
    90).
    Nov 3 16:0[ 102.959976] [<fffffff141752d>] ? do_scan_async+0x0/0x3d
    6:13 control ker[ 102.966801] [<ffffffff81417521>] do_scsi_scan_host+0xa1/0xad
    nel: [ 102.683509] Modules linked in: scsi_debu[ 102.976609] [<ffffffff8141754e>] do_scan_async+0x21/0x3d
    g ipt_MASQUERADE iptable_nat nf_[ 102.985889] [<ffffffff8141752d>] ? do_scan_async+0x0/0x3d
    nat af_packet nfsd lockd nfs_acl auth_rpcgss exp[ 102.994412] [<ffffffff810a77f6>] kthread+0xc3/0xd2
    ortfs sco bridge stp llc bnep l2[ 103.003098] [<ffffffff8113785d>] ? trace_hardirqs_on_caller+0x18/0x48
    Nov 3 16:06:13 control kernel: [ 103.003098] [ 103.012765] [<ffffffff8100f904>] kernel_thread_helper+0x4/0x10
    [<ffffffff8113785d>] ? trace_har[ 103.022542] [<ffffffff81551210>] ? restore_args+0x0/0x30
    dirqs_on_caller+0x18/0x48
    Nov 3 16:06:13 contro[ 103.031013] [<ffffffff810a7733>] ? kthread+0x0/0xd2
    l kernel: [ 103.012765] [<ffff[ 103.039803] [<ffffffff8100f900>] ? kernel_thread_helper+0x0/0x10
    ffff8100f904>] kernel_thread_helper+0x4/0x10
    Nov[ 103.048967] ---[ end trace 0acaa11d0c3e9c22 ]---
    3 16:06:13 control kernel: [ 103.022542] [<ffffffff81551210>] ? restore_args+0x0/0x30
    Nov 3 16:06:13 control kernel: [ 103.031013] [<ffffffff810a7733>] ? kthread+0x0/0xd[ 103.070125] scsi 4:0:0:0: Direct-Access Linux scsi_debug 0004 PQ: 0 ANSI: 5
    2
    Nov 3 16:06:13 control kernel: [ 103.039803] [<ffffffff8100f900>] ? kernel_thread_helper+0x0/0x10
    Nov 3 16:06:13 control kernel: [ 103.048967] ---[ end trace 0acaa11d0c3e9c22 ]---
    Nov 3 16:06:13 control kernel: [ 103.070125] scsi 4:0:0:0: Direct-Access Linux scsi_debug 0004 PQ: 0 ANSI: 5
    [ 103.110940] sd 4:0:0:0: Attached scsi generic sg2 type 0
    Nov 3 16:06:13 control kernel: [ 103.110940] sd 4:0:0:0: Attached scsi generic[ 103.125754] sd 4:0:0:0: [sdb] 16384 512-byte logical blocks: (8.38 MB/8.00 MiB)
    sg2 type 0
    Nov 3 16:06:13 [ 103.164255] sd 4:0:0:0: [sdb] Write Protect is off
    [ 103.171863] sd 4:0:0:0: [sdb] Mode Sense: 73 00 10 08
    Nov 3 16:06:13 control kernel: Nov 3 16:06:13 control kernel: [ 103.224509] sd 4:0:0:0: [sdb] Write cache: enabled, read cache: enabled, supports DPO and FUA
    Nov 3 16:06:13 control kernel: [ 103.224509] sd 4:0:0:0: [sdb] Write cache: en[ 103.284456] sdb: unknown partition table
    Nov 3 16:06:13 control kernel: [ 103.284456] sdb: unknown par[ 103.308541] sd 4:0:0:0: [sdb] Attached SCSI disk
    Nov 3 16:06:13 control kernel: [ 103.308541] sd 4:0:0:0: [sdb]


    ---
    ~Randy
    *** Remember to use Documentation/SubmitChecklist when testing your code ***


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