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    SubjectRe: 2.6.26-rc2-mm1: sparc64 - possible recursive locking detected
    On Wed, 14 May 2008 20:29:40 +0200 Mariusz Kozlowski <m.kozlowski@tuxland.pl> wrote:

    > Hello,
    >
    > Got this on sparc64 startup:

    whoa. A sparc64 tester? Thanks!

    > =============================================
    > [ INFO: possible recursive locking detected ]
    > 2.6.26-rc2-mm1 #2
    > ---------------------------------------------
    > modprobe/514 is trying to acquire lock:
    > (&cls->mutex){--..}, at: [<00000000005ff538>] device_add+0x3c0/0x5c0
    >
    > but task is already holding lock:
    > (&cls->mutex){--..}, at: [<000000000060287c>] class_interface_register+0x44/0xe0
    >
    > other info that might help us debug this:
    > 1 lock held by modprobe/514:
    > #0: (&cls->mutex){--..}, at: [<000000000060287c>] class_interface_register+0x44/0xe0
    >
    > stack backtrace:
    > Call Trace:
    > [000000000048cc64] __lock_acquire+0x104c/0x1400
    > [000000000048d098] lock_acquire+0x80/0xa0
    > [0000000000701898] mutex_lock_nested+0xc0/0x4e0
    > [00000000005ff538] device_add+0x3c0/0x5c0
    > [00000000005ff74c] device_register+0x14/0x20
    > [00000000005ff808] device_create+0xb0/0xe0
    > [0000000010012ef8] sg_add+0x160/0x380 [sg]
    > [00000000006028d4] class_interface_register+0x9c/0xe0
    > [0000000000617050] scsi_register_interface+0x18/0x40
    > [000000001001c0a4] init_sg+0xac/0x180 [sg]
    > [00000000004960c8] sys_init_module+0xb0/0x1c0
    > [00000000004463cc] sys32_init_module+0x14/0x20
    > [0000000000406294] linux_sparc_syscall32+0x3c/0x40
    > [0000000000013698] 0x136a0
    >

    Yeah, this is a bug which has always been there, afaik. A
    semaphore was converted to a mutex. Semaphores don't have lockdep
    checking, but mutexes do, so we just now got to find out about it.
    Some finger-pointing is occurring over on the scsi list ;)

    I assume the machine otherwise works OK?


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