Hi Steve,
I get a "sleeping function called from invalid context" when I invoke sysrq Z.
I get this both with CONFIG_MAGIC_SYSRQ_FORCE_PRINTK enabled and disabled.
3.0.12-rt29
ARM Pandaboard
I have not tried this on 3.2-rc4-rt5.
[ 900.963226] SysRq : Dump ftrace buffer
[ 900.967163] Dumping ftrace buffer:
[ 900.970733] BUG: sleeping function called from invalid context at kernel/rtmutex.c:645
[ 900.985137] in_atomic(): 0, irqs_disabled(): 128, pid: 563, name: irq/106-OMAP UA
[ 900.992980] 2 locks held by irq/106-OMAP UA/563:
[ 900.997833] #0: (&port_lock_key){+.+...}, at: [<c02d8b14>] serial_omap_irq+0x4c/0x7dc
[ 901.006286] #1: (sysrq_key_table_lock){+.+...}, at: [<c02c13a0>] __handle_sysrq+0x20/0x18c
[ 901.015167] irq event stamp: 45345
[ 901.018737] hardirqs last enabled at (45344): [<c0482f68>] _raw_spin_unlock_irq+0x24/0x4c
[ 901.027435] hardirqs last disabled at (45345): [<c00fb854>] ftrace_dump+0x14/0x23c
[ 901.035400] softirqs last enabled at (0): [<c009dca8>] copy_process+0x364/0xf84
[ 901.043182] softirqs last disabled at (0): [< (null)>] (null)
[ 901.049499] [<c00681b8>] (unwind_backtrace+0x0/0xf0) from [<c04824d0>] (rt_spin_lock+0x24/0x5c)
[ 901.058654] [<c04824d0>] (rt_spin_lock+0x24/0x5c) from [<c00f3b34>] (read_buffer_lock+0x4c/0x6c)
[ 901.067871] [<c00f3b34>] (read_buffer_lock+0x4c/0x6c) from [<c00f5908>] (ring_buffer_empty_cpu+0x50/0x7c)
[ 901.077911] [<c00f5908>] (ring_buffer_empty_cpu+0x50/0x7c) from [<c00fa3cc>] (trace_empty+0x58/0xd8)
[ 901.087524] [<c00fa3cc>] (trace_empty+0x58/0xd8) from [<c00fb9f8>] (ftrace_dump+0x1b8/0x23c)
[ 901.096374] [<c00fb9f8>] (ftrace_dump+0x1b8/0x23c) from [<c02c1428>] (__handle_sysrq+0xa8/0x18c)
[ 901.105621] [<c02c1428>] (__handle_sysrq+0xa8/0x18c) from [<c02d90cc>] (serial_omap_irq+0x604/0x7dc)
[ 901.115203] [<c02d90cc>] (serial_omap_irq+0x604/0x7dc) from [<c00eb934>] (irq_forced_thread_fn+0x20/0x40)
[ 901.125244] [<c00eb934>] (irq_forced_thread_fn+0x20/0x40) from [<c00eb7dc>] (irq_thread+0x144/0x1e4)
[ 901.134887] [<c00eb7dc>] (irq_thread+0x144/0x1e4) from [<c00c094c>] (kthread+0x7c/0x84)
[ 901.143310] [<c00c094c>] (kthread+0x7c/0x84) from [<c0061e30>] (kernel_thread_exit+0x0/0x8)
[ 901.152496] (ftrace buffer empty)
-Frank
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