magic sysrq via /proc

If you can't type magic-sysrq for some reason, you can echo the magic sysreq key to /proc/sysrq-trigger for the same effect.

baci:~# echo t > /proc/sysrq-trigger
SysRq : Show State

  task                 PC          pid father child younger older
init          S a0000001006363c0     0     1      0     2               (NOTLB)

Call Trace:
 [] schedule+0xbf0/0x1280
                                sp=e00000407fe07d80 bsp=e00000407fe010e8
 [] schedule_timeout+0x100/0x1a0
                                sp=e00000407fe07d90 bsp=e00000407fe010b0
 [] do_select+0x270/0x4c0
                                sp=e00000407fe07dd0 bsp=e00000407fe00f80
 [] sys_select+0x590/0x8c0
                                sp=e00000407fe07df0 bsp=e00000407fe00ea0
 [] ia64_ret_from_syscall+0x0/0x20
                                sp=e00000407fe07e30 bsp=e00000407fe00ea0
migration/0   S a000000100081010     0     2      1             3       (L-TLB)