BUG: 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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