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    SubjectBUG: sleeping function called from invalid context at kernel/fork.c:385
    Saw this when running strace -f on a script on 2.6.21 on ia64:

    BUG: sleeping function called from invalid context at kernel/fork.c:385
    in_atomic():1, irqs_disabled():0

    Call Trace:
    [<a000000100014700>] show_stack+0x80/0xa0
    sp=e00000306e6f7a00 bsp=e00000306e6f0ef8
    [<a000000100014750>] dump_stack+0x30/0x60
    sp=e00000306e6f7bd0 bsp=e00000306e6f0ee0
    [<a0000001000acaf0>] __might_sleep+0x1f0/0x260
    sp=e00000306e6f7bd0 bsp=e00000306e6f0eb8
    [<a0000001000bd2e0>] mmput+0x20/0x220
    sp=e00000306e6f7bd0 bsp=e00000306e6f0e90
    [<a0000001000321e0>] sys_ptrace+0x460/0x1600
    sp=e00000306e6f7bd0 bsp=e00000306e6f0d80
    [<a00000010000bc40>] ia64_ret_from_syscall+0x0/0x20
    sp=e00000306e6f7e30 bsp=e00000306e6f0d80
    [<a000000000010620>] __kernel_syscall_via_break+0x0/0x20
    sp=e00000306e6f8000 bsp=e00000306e6f0d80
    BUG: sleeping function called from invalid context at kernel/fork.c:385
    in_atomic():1, irqs_disabled():0

    Call Trace:
    [<a000000100014700>] show_stack+0x80/0xa0
    sp=e00000306e6f7a00 bsp=e00000306e6f0ef8
    [<a000000100014750>] dump_stack+0x30/0x60
    sp=e00000306e6f7bd0 bsp=e00000306e6f0ee0
    [<a0000001000acaf0>] __might_sleep+0x1f0/0x260
    sp=e00000306e6f7bd0 bsp=e00000306e6f0eb8
    [<a0000001000bd2e0>] mmput+0x20/0x220
    sp=e00000306e6f7bd0 bsp=e00000306e6f0e90
    [<a0000001000321e0>] sys_ptrace+0x460/0x1600
    sp=e00000306e6f7bd0 bsp=e00000306e6f0d80
    [<a00000010000bc40>] ia64_ret_from_syscall+0x0/0x20
    sp=e00000306e6f7e30 bsp=e00000306e6f0d80
    [<a000000000010620>] __kernel_syscall_via_break+0x0/0x20
    sp=e00000306e6f8000 bsp=e00000306e6f0d80

    I could reproduce it via 'strace -f sleep 1'

    Cheers,

    Dave.
    --
    Dave Chinner
    Principal Engineer
    SGI Australian Software Group
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