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    SubjectRe: 2.6.24-rc5-mm1 - SCSI/blkdev probing hang
    On Thu, 20 Dec 2007 15:57:45 -0500
    Rik van Riel <riel@redhat.com> wrote:

    > 2.6.24-rc5-mm1 seems to have a hang related to the SCSI or block
    > device probing code.
    >
    > This is on a dual quad-core x86-64 system with megaraid_sas controller.
    >
    > scsi 0:2:0:0: Direct-Access DELL PERC 5/i 1.03 PQ: 0 ANSI: 5
    > general protection fault: 0000 [1] SMP
    > last sysfs file: /sys/class/firmware/timeout
    > CPU 7
    > Modules linked in: ata_piix libata dm_snapshot dm_zero dm_mirror dm_mod shpchp megaraid_sas sd_mod scsi_mod ext3 jbd mbcache uhci_hcd ohci_hcd ehci_hcd
    > Pid: 678, comm: scsi_scan_0 Not tainted 2.6.24-rc5-mm1 #1
    > RIP: 0010:[<ffffffff81058183>] [<ffffffff81058183>] mark_lock+0x1b/0x472

    Could be that someone passed a garbage pointer into lockdep.

    > RSP: 0018:ffff81043ba29c20 EFLAGS: 00010002
    > RAX: 0000000000000010 RBX: ffff81043b9ee8f0 RCX: ffff81043b9ee804
    > RDX: 6b6b6b6b6b6b6b6b RSI: ffff81043b9ee8f0 RDI: ffff81043b9ee000
    > RBP: ffff81043b9ee000 R08: 0000000000000002 R09: 0000000000000000
    > R10: ffffffff81129055 R11: 0000000281128c8d R12: 0000000000000004
    > R13: 0000000000000001 R14: 0000000000000002 R15: ffff81043e508028
    > FS: 0000000000000000(0000) GS:ffff81043e4e6a28(0000) knlGS:0000000000000000
    > CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
    > CR2: 000000361969afa0 CR3: 0000000000201000 CR4: 00000000000006e0
    > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    > Process scsi_scan_0 (pid: 678, threadinfo ffff81043ba28000, task ffff81043b9ee000)
    > Stack: ffff81043b9ee8f0 6b6b6b6b6b6b6b6b ffff81043b9ee000<6>ata1.00: ATAPI: HL-DT-STCD-RW/DVD-ROM GCC-T10N, A102, max UDMA/33
    > ffffffff81059139
    > 000000003ba29c50 0000000000000002 0000000000000000 ffffffff81058623
    > ffff81043b504660 0000000000000246 ffff81043e508028 ffff81043b504660
    > Call Trace:
    > [<ffffffff81059139>] __lock_acquire+0x4d7/0xc8e
    > [<ffffffff81058623>] mark_held_locks+0x49/0x67
    > [<ffffffff81059ce2>] lock_acquire+0x5a/0x73
    > [<ffffffff81129055>] kobject_add+0xca/0x194
    > [<ffffffff8126d56c>] mutex_lock_nested+0x2a1/0x2b0
    > [<ffffffff8126e997>] _spin_lock+0x26/0x52
    > [<ffffffff81129055>] kobject_add+0xca/0x194
    > [<ffffffff811a318c>] device_add+0x9a/0x56e
    > [<ffffffff8805c327>] :scsi_mod:scsi_alloc_target+0x2cd/0x343
    > [<ffffffff8805c492>] :scsi_mod:__scsi_scan_target+0x66/0x5c6
    > [<ffffffff810587f0>] trace_hardirqs_on+0x115/0x138
    > [<ffffffff8805ca37>] :scsi_mod:scsi_scan_channel+0x45/0x70
    > [<ffffffff8805cb37>] :scsi_mod:scsi_scan_host_selected+0xd5/0x110
    > ata1.00: configured for UDMA/33
    > ata2: port disabled. ignoring.
    > [<ffffffff8805cbe5>] :scsi_mod:do_scan_async+0x0/0x152
    > [<ffffffff8805cbf9>] :scsi_mod:do_scan_async+0x14/0x152
    > [<ffffffff8805cbe5>] :scsi_mod:do_scan_async+0x0/0x152
    > [<ffffffff8104d4e8>] kthread+0x47/0x73
    > [<ffffffff8126e418>] trace_hardirqs_on_thunk+0x35/0x3a
    > [<ffffffff8100cee8>] child_rip+0xa/0x12
    > [<ffffffff8100c5ff>] restore_args+0x0/0x30
    > [<ffffffff811e0908>] menu_reflect+0x0/0x75
    > [<ffffffff8104d371>] kthreadd+0x115/0x13a
    > [<ffffffff8104d4a1>] kthread+0x0/0x73
    > [<ffffffff8100cede>] child_rip+0x0/0x12
    >

    It could be a scsi problem, or it could be all the kobject changes in
    Greg's driver tree. Or a combination of the two.

    Don't know, sorry.



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