linux-kernel - [lkp] [sched] ec58e50592: WARNING: CPU: 0 PID: 5132 at kernel/fork.c:296 free

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Date:	Mon, 27 Jun 2016 09:33:05 +0800
From:	kernel test robot <xiaolong.ye@...el.com>
To:	Andy Lutomirski <luto@...nel.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>, lkp@...org
Subject: [lkp] [sched]  ec58e50592: WARNING: CPU: 0 PID: 5132 at
 kernel/fork.c:296 free_task+0x35/0x5f


FYI, we noticed the following commit:

https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/vmap_stack
commit ec58e505925c46bd43f9c4275c78292d4483af16 ("sched: Free the stack early if CONFIG_THREAD_INFO_IN_TASK")

in testcase: trinity
with following parameters: runtime=300s

on test machine: vm-kbuild-2G: 2 threads qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap with 2G memory

caused below changes:


+-------------------------------------+------------+------------+
|                                     | ddf4847e6f | ec58e50592 |
+-------------------------------------+------------+------------+
| boot_successes                      | 8          | 4          |
| boot_failures                       | 0          | 4          |
| WARNING:at_kernel/fork.c:#free_task | 0          | 4          |
| backtrace:_do_fork                  | 0          | 4          |
| backtrace:SyS_clone                 | 0          | 4          |
+-------------------------------------+------------+------------+



[   29.950472] sock: process `trinity-main' is using obsolete setsockopt SO_BSDCOMPAT
[   39.309659] VFS: Warning: trinity-c0 using old stat() call. Recompile your binary.
[   40.512647] ------------[ cut here ]------------
[   40.514588] WARNING: CPU: 0 PID: 5132 at kernel/fork.c:296 free_task+0x35/0x5f
[   40.523082] Modules linked in: acpi_cpufreq
[   40.525310] CPU: 0 PID: 5132 Comm: trinity-c0 Not tainted 4.7.0-rc4-00255-gec58e50 #1
[   40.530022] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[   40.546800]  0000000000000000 ffff88007e90fd50 ffffffff814e4776 0000000000000000
[   40.559103]  0000000000000000 ffff88007e90fd90 ffffffff8110267c 000001287e90fda0
[   40.572406]  ffff88007e84d280 ffff8800751b2800 00000000fffffff4 ffff88007e42f0b8
[   40.584404] Call Trace:
[   40.586590]  [<ffffffff814e4776>] dump_stack+0x85/0xbe
[   40.588487]  [<ffffffff8110267c>] __warn+0xca/0xe5
[   40.600659]  [<ffffffff81102753>] warn_slowpath_null+0x1d/0x1f
[   40.607024]  [<ffffffff810ffcc8>] free_task+0x35/0x5f
[   40.610301]  [<ffffffff81100a03>] copy_process+0x710/0x1717
[   40.612306]  [<ffffffff81101bb6>] _do_fork+0xbe/0x358
[   40.623198]  [<ffffffff81101ed6>] SyS_clone+0x19/0x1b
[   40.628181]  [<ffffffff810019c6>] do_syscall_64+0x69/0xc6
[   40.634729]  [<ffffffff81a9ae44>] entry_SYSCALL64_slow_path+0x25/0x25
[   40.650469] ---[ end trace 942898900a0dd524 ]---
[  222.049702] random: nonblocking pool is initialized


FYI, raw QEMU command line is:

	qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap -kernel /pkg/linux/x86_64-lkp/gcc-4.9/ec58e505925c46bd43f9c4275c78292d4483af16/vmlinuz-4.7.0-rc4-00255-gec58e50 -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-kbuild-2G-11/bisect_trinity-300s-debian-x86_64-2015-02-07.cgz-x86_64-lkp-ec58e505925c46bd43f9c4275c78292d4483af16-20160627-111363-1oj47zp-0.yaml ARCH=x86_64 kconfig=x86_64-lkp branch=luto/x86/vmap_stack commit=ec58e505925c46bd43f9c4275c78292d4483af16 BOOT_IMAGE=/pkg/linux/x86_64-lkp/gcc-4.9/ec58e505925c46bd43f9c4275c78292d4483af16/vmlinuz-4.7.0-rc4-00255-gec58e50 max_uptime=1500 RESULT_ROOT=/result/trinity/300s/vm-kbuild-2G/debian-x86_64-2015-02-07.cgz/x86_64-lkp/gcc-4.9/ec58e505925c46bd43f9c4275c78292d4483af16/0 LKP_SERVER=inn earlyprintk=ttyS0,115200 systemd.log_level=err debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal rw ip=::::vm-kbuild-2G-11::dhcp'  -initrd /fs/sdd1/initrd-vm-kbuild-2G-11 -m 2048 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0,hostfwd=tcp::23026-:22 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -drive file=/fs/sdd1/disk0-vm-kbuild-2G-11,media=disk,if=virtio -drive file=/fs/sdd1/disk1-vm-kbuild-2G-11,media=disk,if=virtio -drive file=/fs/sdd1/disk2-vm-kbuild-2G-11,media=disk,if=virtio -drive file=/fs/sdd1/disk3-vm-kbuild-2G-11,media=disk,if=virtio -drive file=/fs/sdd1/disk4-vm-kbuild-2G-11,media=disk,if=virtio -drive file=/fs/sdd1/disk5-vm-kbuild-2G-11,media=disk,if=virtio -drive file=/fs/sdd1/disk6-vm-kbuild-2G-11,media=disk,if=virtio -pidfile /dev/shm/kboot/pid-vm-kbuild-2G-11 -serial file:/dev/shm/kboot/serial-vm-kbuild-2G-11 -daemonize -display none -monitor null 


To reproduce:

        git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml



Thanks,
Xiaolong

View attachment "config-4.7.0-rc4-00255-gec58e50" of type "text/plain" (96954 bytes)

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