linux-kernel - [lkp] [mntns] 1ef38d2db6: general protection fault: 0000 [#1] SMP

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Date:	Tue, 9 Aug 2016 23:06:22 +0800
From:	kernel test robot <xiaolong.ye@...el.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Kees Cook <keescook@...omium.org>,
	LKML <linux-kernel@...r.kernel.org>,
	containers@...ts.linux-foundation.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>, lkp@...org
Subject: [lkp] [mntns]  1ef38d2db6: general protection fault: 0000 [#1] SMP


FYI, we noticed the following commit:

https://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git for-testing
commit 1ef38d2db643a00884e5296ad7b8118509c070a6 ("mntns: Add a limit on the number of mount namespaces.")

in testcase: boot

on test machine: 4 threads qemu-system-x86_64 -enable-kvm -cpu IvyBridge with 2G memory

caused below changes:


+------------------------------------------+------------+------------+
|                                          | 703286608a | 1ef38d2db6 |
+------------------------------------------+------------+------------+
| boot_successes                           | 8          | 4          |
| boot_failures                            | 0          | 4          |
| general_protection_fault:#[##]SMP        | 0          | 4          |
| RIP:dec_ucount                           | 0          | 4          |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 4          |
| backtrace:nfs_fs_mount                   | 0          | 4          |
| backtrace:SyS_mount                      | 0          | 4          |
+------------------------------------------+------------+------------+



[   40.882582] /lkp/lkp/src/bin/run-lkp
[   40.916380] RESULT_ROOT=/result/boot/1/vm-ivb41-2G/debian-x86_64-2015-02-07.cgz/x86_64-allyesdebian/gcc-6/1ef38d2db643a00884e5296ad7b8118509c070a6/0
[   40.922250] job=/lkp/scheduled/vm-ivb41-2G-1/boot-1-debian-x86_64-2015-02-07.cgz-1ef38d2db643a00884e5296ad7b8118509c070a6-20160809-97512-123arxg-0.yaml
[   41.013896] general protection fault: 0000 [#1] SMP
[   41.014931] Modules linked in:
[   41.016069] CPU: 3 PID: 863 Comm: mount.nfs Not tainted 4.8.0-rc1-00012-g1ef38d2 #180
[   41.017628] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[   41.019613] task: ffff88007a9e00c0 task.stack: ffff88007d4d8000
[   41.020811] RIP: 0010:[<ffffffff81106016>]  [<ffffffff81106016>] dec_ucount+0x30/0x81
[   41.022476] RSP: 0018:ffff88007d4dbcc0  EFLAGS: 00010206
[   41.023554] RAX: ffff88007a9e00c0 RBX: 5a5a5a5a5a5a5a5a RCX: 5a5a5a5a5a5a5a8e
[   41.024966] RDX: 000000000001f3a0 RSI: 0000000000000005 RDI: 5a5a5a5a5a5a5a5a
[   41.028615] RBP: ffff88007d4dbce0 R08: 00000011f84cb2a8 R09: 0000000000000001
[   41.029819] R10: ffff88009bb4ca98 R11: 0000000000000000 R12: ffffffff839ee3fc
[   41.031755] R13: 5a5a5a5a5a5a5a5a R14: 0000000000000034 R15: ffff88007d6ce920
[   41.033459] FS:  00007f6b3a7a3880(0000) GS:ffff88009cc00000(0000) knlGS:0000000000000000
[   41.035743] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   41.037087] CR2: 00000000015b6000 CR3: 000000007b4ca000 CR4: 00000000001406e0
[   41.038868] Stack:
[   41.039756]  ffff88007c870f00 ffff88007c870f00 ffff88007c93ef40 ffff88007c93ef40
[   41.042211]  ffff88007d4dbcf8 ffffffff812425c4 0000000000000000 ffff88007d4dbd30
[   41.044951]  ffffffff81242618 ffff88007c8908e0 ffff88007b1772b8 0000000000000000
[   41.047647] Call Trace:
[   41.048382]  [<ffffffff812425c4>] put_mnt_ns+0x35/0x40
[   41.049564]  [<ffffffff81242618>] mount_subtree+0x49/0x7e
[   41.050859]  [<ffffffff81397c7c>] nfs_follow_remote_path+0xde/0x127
[   41.052619]  [<ffffffff81397d50>] nfs4_try_mount+0x49/0x4e
[   41.054050]  [<ffffffff8136fc14>] nfs_fs_mount+0x816/0x847
[   41.055607]  [<ffffffff81122875>] ? lockdep_init_map+0xc3/0x1c6
[   41.057082]  [<ffffffff8136fcd1>] ? nfs_initialise_sb+0x8c/0x8c
[   41.058259]  [<ffffffff8136d336>] ? param_set_portnr+0x48/0x48
[   41.059781]  [<ffffffff81227564>] mount_fs+0x67/0x131
[   41.061091]  [<ffffffff81227564>] ? mount_fs+0x67/0x131
[   41.062210]  [<ffffffff8123f287>] vfs_kern_mount+0x6b/0xdb
[   41.063827]  [<ffffffff81241cdb>] do_mount+0x708/0x97d
[   41.065151]  [<ffffffff8124154c>] ? copy_mount_options+0xba/0x124
[   41.066790]  [<ffffffff81242181>] SyS_mount+0x77/0x9f
[   41.068076]  [<ffffffff82ef7c7c>] entry_SYSCALL_64_fastpath+0x1f/0xbd
[   41.069684]  [<ffffffff81121b35>] ? trace_hardirqs_off_caller+0x3f/0xab
[   41.071204] Code: 55 89 f6 48 89 e5 41 56 4c 8d 34 b5 20 00 00 00 41 55 49 89 fd 41 54 49 c7 c4 fc e3 9e 83 53 48 89 fb 48 85 db 74 44 4a 8d 0c 33 <8b> 11 89 d6 ff ce 78 0e 89 d0 f0 0f b1 31 39 c2 74 21 89 c2 eb 
[   41.090703] RIP  [<ffffffff81106016>] dec_ucount+0x30/0x81
[   41.092106]  RSP <ffff88007d4dbcc0>
[   41.093105] ---[ end trace b9983de5f2860fb3 ]---
[   41.094220] Kernel panic - not syncing: Fatal exception


FYI, raw QEMU command line is:

	qemu-system-x86_64 -enable-kvm -cpu IvyBridge -kernel /pkg/linux/x86_64-allyesdebian/gcc-6/1ef38d2db643a00884e5296ad7b8118509c070a6/vmlinuz-4.8.0-rc1-00012-g1ef38d2 -append 'ip=::::vm-ivb41-2G-1::dhcp root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-ivb41-2G-1/boot-1-debian-x86_64-2015-02-07.cgz-1ef38d2db643a00884e5296ad7b8118509c070a6-20160809-97512-123arxg-0.yaml ARCH=x86_64 kconfig=x86_64-allyesdebian branch=linux-devel/devel-catchup-201608090432 commit=1ef38d2db643a00884e5296ad7b8118509c070a6 BOOT_IMAGE=/pkg/linux/x86_64-allyesdebian/gcc-6/1ef38d2db643a00884e5296ad7b8118509c070a6/vmlinuz-4.8.0-rc1-00012-g1ef38d2 max_uptime=600 RESULT_ROOT=/result/boot/1/vm-ivb41-2G/debian-x86_64-2015-02-07.cgz/x86_64-allyesdebian/gcc-6/1ef38d2db643a00884e5296ad7b8118509c070a6/0 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/sda5/initrd-vm-ivb41-2G-1 -m 2560 -smp 4 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -watchdog-action debug -rtc base=localtime -drive file=/fs/sda5/disk0-vm-ivb41-2G-1,media=disk,if=virtio -drive file=/fs/sda5/disk1-vm-ivb41-2G-1,media=disk,if=virtio -drive file=/fs/sda5/disk2-vm-ivb41-2G-1,media=disk,if=virtio -drive file=/fs/sda5/disk3-vm-ivb41-2G-1,media=disk,if=virtio -drive file=/fs/sda5/disk4-vm-ivb41-2G-1,media=disk,if=virtio -drive file=/fs/sda5/disk5-vm-ivb41-2G-1,media=disk,if=virtio -pidfile /dev/shm/kboot/pid-vm-ivb41-2G-1 -serial file:/dev/shm/kboot/serial-vm-ivb41-2G-1 -daemonize -display none -monitor null 





Thanks,
Xiaolong

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