Message-ID: <20160630015612.GE8951@yexl-desktop>
Date:	Thu, 30 Jun 2016 09:56:12 +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]  325e2efd8c: BUG: unable to handle kernel paging
 request at ffff88000ea0befc


FYI, we noticed the following commit:

https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/vmap_stack
commit 325e2efd8c4ae6b4bf328e0ede2acfe8b3b48e79 ("sched: Free the stack early if CONFIG_THREAD_INFO_IN_TASK")

in testcase: boot

on test machine: 1 threads qemu-system-x86_64 -enable-kvm -cpu Westmere with 320M memory

caused below changes:


+--------------------------------------------------------------+------------+------------+
|                                                              | 7117d60112 | 325e2efd8c |
+--------------------------------------------------------------+------------+------------+
| boot_successes                                               | 91         | 1          |
| boot_failures                                                | 9          | 30         |
| Out_of_memory:Kill_process                                   | 4          |            |
| BUG:kernel_test_oversize                                     | 4          |            |
| WARNING:at_arch/x86/include/asm/fpu/internal.h:#fpu__restore | 1          |            |
| BUG:unable_to_handle_kernel                                  | 0          | 30         |
| Oops                                                         | 0          | 30         |
| RIP:do_raw_spin_lock                                         | 0          | 30         |
| Kernel_panic-not_syncing:Fatal_exception                     | 0          | 30         |
| backtrace:kthread_stop                                       | 0          | 30         |
| backtrace:test_rht_init                                      | 0          | 30         |
| backtrace:kernel_init_freeable                               | 0          | 30         |
+--------------------------------------------------------------+------------+------------+



[    1.603591] Test failed: thread 6 returned: -12
[    1.603595] Test failed: thread 7 returned: -12
[    1.631305] Test failed: thread 8 returned: -12
[    1.632027] BUG: unable to handle kernel paging request at ffff88000ea0befc
[    1.633135] IP: [<ffffffff8111599a>] do_raw_spin_lock+0x2a/0x120
[    1.634101] PGD 55e1067 PUD 55e2067 PMD 1398b067 PTE 800000000ea0b060
[    1.635199] Oops: 0000 [#1] PREEMPT DEBUG_PAGEALLOC
[    1.635935] CPU: 0 PID: 1 Comm: swapper Not tainted 4.7.0-rc4-00256-g325e2ef #2
[    1.637047] task: ffff880013552600 task.stack: ffff880013558000
[    1.637979] RIP: 0010:[<ffffffff8111599a>]  [<ffffffff8111599a>] do_raw_spin_lock+0x2a/0x120
[    1.639304] RSP: 0000:ffff88001355bd18  EFLAGS: 00010082
[    1.640118] RAX: 0000000000000000 RBX: ffff88000ea0bef8 RCX: 0000000000000000
[    1.641206] RDX: 0000000000000000 RSI: 00000000000005a8 RDI: ffff88000ea0bef8
[    1.642294] RBP: ffff88001355bd30 R08: 0000000000001000 R09: 0000000000000002
[    1.643376] R10: 0000000000000067 R11: 00003ffffffff000 R12: ffff88000ea0bef8
[    1.644453] R13: ffff88000ea0bef0 R14: ffff880013552600 R15: ffff880013552600
[    1.645539] FS:  0000000000000000(0000) GS:ffffffff8304c000(0000) knlGS:0000000000000000
[    1.646755] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    1.647647] CR2: ffff88000ea0befc CR3: 000000000300c000 CR4: 00000000000006b0
[    1.648718] Stack:
[    1.649055]  ffff88000ea0bef8 ffff88000ea0bef8 ffff88000ea0bef0 ffff88001355bd48
[    1.650269]  ffffffff82793ca1 7fffffffffffffff ffff88001355bdb0 ffffffff8278ecf3
[    1.651467]  ffff88001355bd78 0000000000000001 ffff880013552600 ffffffff811007b0
[    1.652679] Call Trace:
[    1.653048]  [<ffffffff82793ca1>] _raw_spin_lock_irq+0x21/0x30
[    1.653944]  [<ffffffff8278ecf3>] wait_for_completion+0x133/0x1c0
[    1.654887]  [<ffffffff811007b0>] ? sched_set_stop_task+0x60/0x60
[    1.655807]  [<ffffffff810f801b>] kthread_stop+0x5b/0xa0
[    1.656623]  [<ffffffff8449d644>] test_rht_init+0xa87/0xb40
[    1.657476]  [<ffffffff8449cbbd>] ? test_kstrtox_init+0xb9b/0xb9b
[    1.658454]  [<ffffffff8446b454>] do_one_initcall+0xd1/0x164
[    1.659328]  [<ffffffff8446b71b>] kernel_init_freeable+0x234/0x2ff
[    1.660288]  [<ffffffff827843da>] kernel_init+0xa/0x110
[    1.661047]  [<ffffffff8279449d>] ret_from_fork+0x1d/0x40
[    1.661869]  [<ffffffff827843d0>] ? rest_init+0x80/0x80
[    1.662667] Code: 00 55 48 89 e5 48 83 ec 18 48 85 ff 48 89 5d e8 4c 89 65 f0 48 89 fb 4c 89 6d f8 75 0e 31 f6 48 c7 c7 c0 8b 0d 83 e8 a6 dd 69 00 <81> 7b 04 ad 4e ad de 74 18 e8 a8 37 63 00 85 c0 74 0f 48 c7 c6 
[    1.666891] RIP  [<ffffffff8111599a>] do_raw_spin_lock+0x2a/0x120
[    1.667830]  RSP <ffff88001355bd18>
[    1.668391] CR2: ffff88000ea0befc
[    1.668904] ---[ end trace fdce1905cee5a7a0 ]---
[    1.669633] Kernel panic - not syncing: Fatal exception


FYI, raw QEMU command line is:

	qemu-system-x86_64 -enable-kvm -cpu Westmere -kernel /pkg/linux/x86_64-randconfig-s4-06300257/gcc-6/325e2efd8c4ae6b4bf328e0ede2acfe8b3b48e79/vmlinuz-4.7.0-rc4-00256-g325e2ef -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-kbuild-yocto-ia32-28/bisect_boot-1-yocto-minimal-i386.cgz-x86_64-randconfig-s4-06300257-325e2efd8c4ae6b4bf328e0ede2acfe8b3b48e79-20160630-98844-15a2z12-0.yaml ARCH=x86_64 kconfig=x86_64-randconfig-s4-06300257 branch=linux-devel/devel-spot-201606300239 commit=325e2efd8c4ae6b4bf328e0ede2acfe8b3b48e79 BOOT_IMAGE=/pkg/linux/x86_64-randconfig-s4-06300257/gcc-6/325e2efd8c4ae6b4bf328e0ede2acfe8b3b48e79/vmlinuz-4.7.0-rc4-00256-g325e2ef max_uptime=600 RESULT_ROOT=/result/boot/1/vm-kbuild-yocto-ia32/yocto-minimal-i386.cgz/x86_64-randconfig-s4-06300257/gcc-6/325e2efd8c4ae6b4bf328e0ede2acfe8b3b48e79/0 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-yocto-ia32-28::dhcp drbd.minor_count=8'  -initrd /fs/sdg1/initrd-vm-kbuild-yocto-ia32-28 -m 320 -smp 1 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -drive file=/fs/sdg1/disk0-vm-kbuild-yocto-ia32-28,media=disk,if=virtio -pidfile /dev/shm/kboot/pid-vm-kbuild-yocto-ia32-28 -serial file:/dev/shm/kboot/serial-vm-kbuild-yocto-ia32-28 -daemonize -display none -monitor null 





Thanks,
Xiaolong

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