[<ffffffffb3491d2e>] proc_pid_stack+0xae/0x100
[<ffffffffb3492df2>] proc_single_show+0x52/0x90
[<ffffffffb3441410>] seq_read+0x110/0x3f0
[<ffffffffb341ab3f>] vfs_read+0x9f/0x170
[<ffffffffb341ba0f>] SyS_read+0x7f/0xf0
[<ffffffffb391f7d5>] system_call_fastpath+0x1c/0x21
[<ffffffffffffffff>] 0xffffffffffffffff