killall -9 mytest

[ 59.004047] CPU: 1 PID: 1432 Comm: mytest Not tainted 4.7.0-rc2+ #250
[ 59.004059] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014
[ 59.004061] 0000000000000000 ffff880137547cf8 ffffffff8133018a ffff88007f049e48
[ 59.004063] ffff88007f049be0 ffff880137547d60 ffffffff8106f865 0000000001bf0005
[ 59.004064] 0000000137547d60 000000053fffae00 ffff88007f049f00 ffff880137547d28
[ 59.004066] Call Trace:
[ 59.004071] [<ffffffff8133018a>] dump_stack+0x63/0x89
[ 59.004074] [<ffffffff8106f865>] do_exit+0xb05/0xb20
[ 59.004076] [<ffffffff8106f8fa>] do_group_exit+0x3a/0xa0
[ 59.004078] [<ffffffff81079a1d>] get_signal+0x1ed/0x560
[ 59.004080] [<ffffffff81025363>] do_signal+0x23/0x750
[ 59.004083] [<ffffffff81095ef0>] ? pick_next_entity+0xa0/0x150
[ 59.004085] [<ffffffff810246ba>] ? __switch_to+0x20a/0x590
[ 59.004087] [<ffffffff8108ce53>] ? finish_task_switch+0x73/0x1f0
[ 59.004090] [<ffffffff816eed5e>] ? __schedule+0x1de/0x590
[ 59.004093] [<ffffffff81059bd8>] ? __do_page_fault+0x1c8/0x4e0
[ 59.004094] [<ffffffff810674a0>] exit_to_usermode_loop+0x47/0x90
[ 59.004097] [<ffffffff81003386>] prepare_exit_to_usermode+0x26/0x30
[ 59.004098] [<ffffffff816f3325>] retint_user+0x8/0x13

[ 26.392961] CPU: 0 PID: 1449 Comm: bash Not tainted 4.7.0-rc2+ #251
[ 26.392962] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014
[ 26.392963] 0000000000000000 ffff88007f5d7da8 ffffffff813301aa 00007fffffffeffd
[ 26.392964] ffff88013a118c00 ffff88007f5d7e00 ffffffff8106de26 00000000000005b6
[ 26.392965] ffff88007f5d7e00 ffffffff8109532c 000000000000059d 00007fffffffeffd
[ 26.392967] Call Trace:
[ 26.392969] [<ffffffff813301aa>] dump_stack+0x63/0x89
[ 26.392971] [<ffffffff8106de26>] release_task+0x486/0x4a0
[ 26.392973] [<ffffffff8109532c>] ? thread_group_cputime_adjusted+0x3c/0x50
[ 26.392975] [<ffffffff8106e429>] wait_consider_task+0x5e9/0xb00
[ 26.392976] [<ffffffff8106ea26>] do_wait+0xe6/0x1f0
[ 26.392978] [<ffffffff8106fb70>] SyS_wait4+0x60/0xc0
[ 26.392979] [<ffffffff8106d910>] ? task_stopped_code+0x50/0x50
[ 26.392982] [<ffffffff816f29f6>] entry_SYSCALL_64_fastpath+0x1e/0xa

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