linux-kernel - a81de5e161: BUG: unable to handle kernel paging request at ffffc90000647e38

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Message-ID: <57b92a5e.LtbFjOy5dxaJTqSl%xiaolong.ye@intel.com>
Date:   Sun, 21 Aug 2016 12:13:18 +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: a81de5e161: BUG: unable to handle kernel paging request at
 ffffc90000647e38


FYI, we noticed the following commit:

https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/vmap_stack
commit a81de5e16134480cc93596945601f19e1ace7723 ("[DEBUG] forcibly free stacks immediately")

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap -smp 2 -m 1G

caused below changes:


+------------------------------------------+------------+------------+
|                                          | b3768b6fde | a81de5e161 |
+------------------------------------------+------------+------------+
| boot_successes                           | 4          | 8          |
| boot_failures                            | 1          | 4          |
| BUG:kernel_hang_in_early-boot_stage      | 1          |            |
| BUG:unable_to_handle_kernel              | 0          | 4          |
| Oops                                     | 0          | 4          |
| RIP:get_wchan                            | 0          | 4          |
| calltrace:SyS_read                       | 0          | 4          |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 4          |
+------------------------------------------+------------+------------+



         Starting RPC Remote Quota Server...
         Starting LSB: Load kernel image with kexec...
         Starting Getty on tty1...
[   22.394549] BUG: unable to handle kernel paging request at ffffc90000647e38
[   22.396728] IP: [<ffffffff81066404>] get_wchan+0x60/0xb5
[   22.412223] PGD 2bc9b067 PUD 2bcb0067 PMD 2a7fb067 PTE 0
[   22.412225] Oops: 0000 [#1] SMP
[   22.412227] Modules linked in: acpi_cpufreq
[   22.412230] CPU: 0 PID: 2630 Comm: pidof Not tainted 4.8.0-rc1-00017-ga81de5e #1
[   22.412231] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[   22.412233] task: ffff8800110c4600 task.stack: ffffc900005d4000
[   22.412239] RIP: 0010:[<ffffffff81066404>]  [<ffffffff81066404>] get_wchan+0x60/0xb5
[   22.412240] RSP: 0018:ffffc900005d7c58  EFLAGS: 00010216
[   22.412241] RAX: ffffc90000647e38 RBX: ffff88003f74e300 RCX: 0000000000000000
[   22.412242] RDX: ffffc90000647ff0 RSI: 0000000000000286 RDI: ffff88003f160000
[   22.412243] RBP: ffffc900005d7c88 R08: 0000000000000000 R09: 0000000000000000
[   22.412244] R10: ffff88002a70d000 R11: ffff8800110c4600 R12: ffff88003f160000
[   22.412245] R13: 0000000000000000 R14: ffffc90000644000 R15: ffff880029c05b01
[   22.412247] FS:  00007fe0f8b2b700(0000) GS:ffff880038800000(0000) knlGS:0000000000000000
[   22.412248] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   22.412249] CR2: ffffc90000647e38 CR3: 000000003f752000 CR4: 00000000000406f0
[   22.412253] Stack:
[   22.412256]  0000000000000000 ffff88003f74e300 ffff88003f160000 0000000000000000
[   22.412258]  0000000000000a44 ffff880029c05b01 ffffc900005d7d98 ffffffff8129eeed
[   22.412260]  ffff880029c05b00 ffff88003f662aa0 5a00000000000000 ffffffffffffffff
[   22.412261] Call Trace:
[   22.412266]  [<ffffffff8129eeed>] do_task_stat+0x3cb/0x93d
[   22.412269]  [<ffffffff8129fe15>] proc_tgid_stat+0x14/0x16
[   22.412271]  [<ffffffff8129a2d3>] proc_single_show+0x56/0x76
[   22.412274]  [<ffffffff8125b83c>] seq_read+0x171/0x333
[   22.412277]  [<ffffffff8123c47b>] __vfs_read+0x26/0xed
[   22.412281]  [<ffffffff811e7169>] ? vm_mmap_pgoff+0x81/0xa7
[   22.412283]  [<ffffffff8123cfb8>] vfs_read+0xa7/0x132
[   22.412285]  [<ffffffff8123e155>] SyS_read+0x4e/0x88
[   22.412288]  [<ffffffff81abc541>] entry_SYSCALL_64_fastpath+0x1f/0xbd
[   22.412306] Code: 41 55 41 54 53 51 4c 8b 77 10 4d 85 f6 75 04 31 c0 eb 5e 48 8b 87 e0 09 00 00 49 8d 96 f0 3f 00 00 49 39 c6 77 e9 48 39 c2 72 e4 <4c> 8b 20 48 89 fb 41 bf 11 00 00 00 4d 39 f4 72 d3 49 39 d4 48 
[   22.412309] RIP  [<ffffffff81066404>] get_wchan+0x60/0xb5
[   22.412310]  RSP <ffffc900005d7c58>
[   22.412310] CR2: ffffc90000647e38
[   22.412313] ---[ end trace 397d4f30e4b22143 ]---
[   22.412315] Kernel panic - not syncing: Fatal exception


FYI, raw QEMU command line is:

	qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap -kernel /pkg/linux/x86_64-lkp/gcc-6/a81de5e16134480cc93596945601f19e1ace7723/vmlinuz-4.8.0-rc1-00017-ga81de5e -append 'ip=::::vm-kbuild-1G-5::dhcp root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-kbuild-1G-5/boot-1-debian-x86_64-2015-02-07.cgz-a81de5e16134480cc93596945601f19e1ace7723-20160821-39118-ygsw4a-0.yaml ARCH=x86_64 kconfig=x86_64-lkp branch=linux-devel/devel-catchup-201608171102 commit=a81de5e16134480cc93596945601f19e1ace7723 BOOT_IMAGE=/pkg/linux/x86_64-lkp/gcc-6/a81de5e16134480cc93596945601f19e1ace7723/vmlinuz-4.8.0-rc1-00017-ga81de5e max_uptime=600 RESULT_ROOT=/result/boot/1/vm-kbuild-1G/debian-x86_64-2015-02-07.cgz/x86_64-lkp/gcc-6/a81de5e16134480cc93596945601f19e1ace7723/0 LKP_SERVER=inn 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 systemd.log_level=err ignore_loglevel earlyprintk=ttyS0,115200 console=ttyS0,115200 console=tty0 vga=normal rw'  -initrd /fs/sdg1/initrd-vm-kbuild-1G-5 -m 1024 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0,hostfwd=tcp::23004-:22 -boot order=nc -no-reboot -watchdog i6300esb -watchdog-action debug -rtc base=localtime -device virtio-scsi-pci,id=scsi0 -drive file=/fs/sdg1/disk0-vm-kbuild-1G-5,if=none,id=hd0,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd0,scsi-id=1,lun=0 -drive file=/fs/sdg1/disk1-vm-kbuild-1G-5,if=none,id=hd1,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd1,scsi-id=1,lun=1 -drive file=/fs/sdg1/disk2-vm-kbuild-1G-5,if=none,id=hd2,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd2,scsi-id=1,lun=2 -drive file=/fs/sdg1/disk3-vm-kbuild-1G-5,if=none,id=hd3,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd3,scsi-id=1,lun=3 -drive file=/fs/sdg1/disk4-vm-kbuild-1G-5,if=none,id=hd4,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd4,scsi-id=1,lun=4 -pidfile /dev/shm/kboot/pid-vm-kbuild-1G-5 -serial file:/dev/shm/kboot/serial-vm-kbuild-1G-5 -daemonize -display none -monitor null 





Thanks,
Kernel Test Robot

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