linux-kernel - 0e80a5db05: WARNING: CPU: 1 PID: 0 at kernel/smp.c:416 smp_call_function

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Date:	Thu, 30 Jun 2016 05:22:13 +0800
From:	kernel test robot <xiaolong.ye@...el.com>
To:	Andy Lutomirski <luto@...nel.org>
Cc:	lkp@...org, Andy Lutomirski <luto@...capital.net>,
	LKML <linux-kernel@...r.kernel.org>
Subject: 0e80a5db05: WARNING: CPU: 1 PID: 0 at kernel/smp.c:416
 smp_call_function_many+0xa7/0x2bb



FYI, we noticed the following commit:

https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/vmap_stack
commit 0e80a5db0584e9505a8dfaa94d4d72fbc8b0315f ("[DEBUG] forcibly free stacks immediately")

in testcase: boot

on test machine: 2 threads qemu-system-x86_64 -enable-kvm with 360M memory

caused below changes:


+---------------------------------------------------+------------+------------+
|                                                   | e5aec78386 | 0e80a5db05 |
+---------------------------------------------------+------------+------------+
| boot_successes                                    | 9          | 0          |
| boot_failures                                     | 3          | 20         |
| WARNING:at_kernel/fork.c:#free_task               | 3          |            |
| backtrace:_do_fork                                | 3          |            |
| backtrace:SyS_clone                               | 3          |            |
| WARNING:at_kernel/smp.c:#smp_call_function_many   | 0          | 20         |
| WARNING:at_kernel/smp.c:#smp_call_function_single | 0          | 14         |
| BUG:spinlock_lockup_suspected_on_CPU              | 0          | 14         |
| RIP:__default_send_IPI_dest_field                 | 0          | 14         |
| RIP:smp_call_function_single                      | 0          | 14         |
| backtrace:sysfs_remove_group                      | 0          | 1          |
| backtrace:param_sysfs_init                        | 0          | 1          |
| backtrace:kernel_init_freeable                    | 0          | 5          |
| BUG:unable_to_handle_kernel                       | 0          | 6          |
| Oops                                              | 0          | 6          |
| RIP:__lock_acquire                                | 0          | 6          |
| Kernel_panic-not_syncing:Fatal_exception          | 0          | 6          |
| backtrace:__clocksource_register_scale            | 0          | 3          |
| backtrace:init_jiffies_clocksource                | 0          | 3          |
| backtrace:do_mount                                | 0          | 6          |
| backtrace:compat_SyS_mount                        | 0          | 4          |
| backtrace:schedule_timeout                        | 0          | 3          |
| backtrace:schedule                                | 0          | 3          |
| backtrace:SyS_mount                               | 0          | 2          |
| backtrace:__class_create                          | 0          | 1          |
| backtrace:vtconsole_class_init                    | 0          | 1          |
+---------------------------------------------------+------------+------------+



[    1.185876] xor: measuring software checksum speed
[    1.188092] kworker/u4:0 (19) used greatest stack depth: 13440 bytes left
[    1.189789] ------------[ cut here ]------------
[    1.191115] WARNING: CPU: 1 PID: 0 at kernel/smp.c:416 smp_call_function_many+0xa7/0x2bb
[    1.193741] Modules linked in:
[    1.194924] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.7.0-rc4-00261-g0e80a5db #266
[    1.197245] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[    1.199734]  0000000000000000 ffffc9000011fc38
[    1.209171]    prefetch64-sse: 17332.000 MB/sec



FYI, raw QEMU command line is:

	qemu-system-x86_64 -enable-kvm -kernel /pkg/linux/x86_64-nfsroot/gcc-6/0e80a5db0584e9505a8dfaa94d4d72fbc8b0315f/vmlinuz-4.7.0-rc4-00261-g0e80a5db -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-vp-quantal-x86_64-3/bisect_boot-1-quantal-core-x86_64.cgz-x86_64-nfsroot-0e80a5db0584e9505a8dfaa94d4d72fbc8b0315f-20160630-12888-1uqtsqt-0.yaml ARCH=x86_64 kconfig=x86_64-nfsroot branch=linux-devel/devel-catchup-201606300112 commit=0e80a5db0584e9505a8dfaa94d4d72fbc8b0315f BOOT_IMAGE=/pkg/linux/x86_64-nfsroot/gcc-6/0e80a5db0584e9505a8dfaa94d4d72fbc8b0315f/vmlinuz-4.7.0-rc4-00261-g0e80a5db max_uptime=600 RESULT_ROOT=/result/boot/1/vm-vp-quantal-x86_64/quantal-core-x86_64.cgz/x86_64-nfsroot/gcc-6/0e80a5db0584e9505a8dfaa94d4d72fbc8b0315f/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-vp-quantal-x86_64-3::dhcp drbd.minor_count=8'  -initrd /fs/sdb1/initrd-vm-vp-quantal-x86_64-3 -m 360 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -pidfile /dev/shm/kboot/pid-vm-vp-quantal-x86_64-3 -serial file:/dev/shm/kboot/serial-vm-vp-quantal-x86_64-3 -daemonize -display none -monitor null 





Thanks,
Kernel Test Robot

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