linux-kernel - [lkp] 8700e3e7c4: BUG: unable to handle kernel NULL pointer dereference at 000001fc

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Date:	Mon, 15 Aug 2016 12:39:42 +0800
From:	kernel test robot <xiaolong.ye@...el.com>
To:	Moni Shoua <monis@...lanox.com>
Cc:	Doug Ledford <dledford@...hat.com>,
	Kamal Heib <kamalh@...lanox.com>,
	Amir Vadai <amirv@...lanox.com>,
	Haggai Eran <haggaie@...lanox.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>, lkp@...org
Subject: [lkp] 8700e3e7c4: BUG: unable to handle kernel NULL pointer
 dereference at 000001fc


FYI, we noticed the following commit:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
commit 8700e3e7c4857d28ebaa824509934556da0b3e76 ("Soft RoCE driver")

in testcase: boot

on test machine: 1 threads qemu-system-i386 -enable-kvm with 256M memory

caused below changes:


+-----------------------------------------------------+----------+------------+
|                                                     | v4.7-rc4 | 8700e3e7c4 |
+-----------------------------------------------------+----------+------------+
| boot_successes                                      | 15       | 0          |
| boot_failures                                       | 10       | 18         |
| invoked_oom-killer:gfp_mask=0x                      | 1        |            |
| Mem-Info                                            | 1        |            |
| INFO:task_blocked_for_more_than#seconds             | 2        |            |
| EIP_is_at__default_send_IPI_dest_field              | 2        |            |
| Kernel_panic-not_syncing:hung_task:blocked_tasks    | 2        |            |
| backtrace:torture_shuffle                           | 2        |            |
| WARNING:at_arch/x86/mm/dump_pagetables.c:#note_page | 7        |            |
| backtrace:mark_rodata_ro                            | 7        |            |
| BUG:unable_to_handle_kernel                         | 0        | 18         |
| Oops                                                | 0        | 18         |
| EIP_is_at_setup_udp_tunnel_sock                     | 0        | 18         |
| Kernel_panic-not_syncing:Fatal_exception            | 0        | 18         |
| backtrace:rxe_net_init                              | 0        | 18         |
| backtrace:rxe_module_init                           | 0        | 18         |
| backtrace:kernel_init_freeable                      | 0        | 18         |
+-----------------------------------------------------+----------+------------+



[   46.816381] usnic_verbs:usnic_uiom_init:581: IOMMU required but not present or enabled.  USNIC QPs will not function w/o enabling IOMMU
[   46.835874] usnic_verbs:usnic_ib_init:647: Unable to initalize umem with err -1
[   46.864766] iscsi: registered transport (iser)
[   46.884623] BUG: unable to handle kernel NULL pointer dereference at 000001fc
[   46.888632] IP: [<c220705a>] setup_udp_tunnel_sock+0x6/0x4f
[   46.891355] *pdpt = 0000000000000000 *pde = f000ff53f000ff53 
[   46.893918] Oops: 0002 [#1] PREEMPT
[   46.896014] CPU: 0 PID: 1 Comm: swapper Not tainted 4.7.0-rc4-00001-g8700e3e #1
[   46.900280] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[   46.904905] task: cf06c040 ti: cf05e000 task.ti: cf05e000
[   46.907854] EIP: 0060:[<c220705a>] EFLAGS: 00210246 CPU: 0
[   46.911137] EIP is at setup_udp_tunnel_sock+0x6/0x4f
[   46.914070] EAX: 00000044 EBX: 00000001 ECX: cf05fef0 EDX: ca8142e0
[   46.917236] ESI: c2c4505b EDI: cf05fef0 EBP: cf05fed0 ESP: cf05fed0
[   46.919836]  DS: 007b ES: 007b FS: 0000 GS: 00e0 SS: 0068
[   46.922046] CR0: 80050033 CR2: 000001fc CR3: 02cec000 CR4: 000006b0
[   46.924550] Stack:
[   46.926014]  cf05ff10 c1fd4657 ca8142e0 0000000a 00000000 00000000 0000b712 00000008
[   46.931274]  00000000 6bb5bd01 c1fd48de 00000000 00000000 cf05ff1c 00000000 00000000
[   46.936122]  cf05ff1c c1fd4bdf 00000000 cf05ff28 c2c4507b ffffffff cf05ff88 c2bf1c74
[   46.942350] Call Trace:
[   46.944403]  [<c1fd4657>] rxe_setup_udp_tunnel+0x8f/0x99
[   46.947689]  [<c1fd48de>] ? net_to_rxe+0x4e/0x4e
[   46.950567]  [<c1fd4bdf>] rxe_net_init+0xe/0xa4
[   46.953147]  [<c2c4507b>] rxe_module_init+0x20/0x4c
[   46.955448]  [<c2bf1c74>] do_one_initcall+0x89/0x113
[   46.957797]  [<c2bf15eb>] ? set_debug_rodata+0xf/0xf
[   46.959966]  [<c2bf1dbc>] ? kernel_init_freeable+0xbe/0x15b
[   46.962262]  [<c2bf1ddc>] kernel_init_freeable+0xde/0x15b
[   46.964418]  [<c232eb54>] kernel_init+0x8/0xd0
[   46.966618]  [<c2333122>] ret_from_kernel_thread+0xe/0x24
[   46.969592]  [<c232eb4c>] ? rest_init+0x6f/0x6f
[   46.973288] Code: 80 04 f7 ff c7 06 00 00 00 00 89 d8 8b 75 f0 65 33 35 14 00 00 00 74 05 e8 3a 1f e6 fe 8d 65 f4 5b 5e 5f 5d c3 55 8b 42 14 89 e5 <80> a0 b8 01 00 00 ef fe 80 bb 01 00 00 8b 11 89 90 60 01 00 00
[   46.991320] EIP: [<c220705a>] setup_udp_tunnel_sock+0x6/0x4f SS:ESP 0068:cf05fed0
[   46.995035] CR2: 00000000000001fc
[   46.996817] ---[ end trace 1be5f94d2ecf9b78 ]---
[   47.001073] Kernel panic - not syncing: Fatal exception


FYI, raw QEMU command line is:

	qemu-system-i386 -enable-kvm -kernel /pkg/linux/i386-randconfig-c0-08121125/gcc-4.9/8700e3e7c4857d28ebaa824509934556da0b3e76/vmlinuz-4.7.0-rc4-00001-g8700e3e -append 'ip=::::vm-intel12-openwrt-i386-1::dhcp root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-intel12-openwrt-i386-1/boot-1-openwrt-i386.cgz-8700e3e7c4857d28ebaa824509934556da0b3e76-20160812-54756-6to0wa-0.yaml ARCH=i386 kconfig=i386-randconfig-c0-08121125 branch=linus/master commit=8700e3e7c4857d28ebaa824509934556da0b3e76 BOOT_IMAGE=/pkg/linux/i386-randconfig-c0-08121125/gcc-4.9/8700e3e7c4857d28ebaa824509934556da0b3e76/vmlinuz-4.7.0-rc4-00001-g8700e3e max_uptime=600 RESULT_ROOT=/result/boot/1/vm-intel12-openwrt-i386/openwrt-i386.cgz/i386-randconfig-c0-08121125/gcc-4.9/8700e3e7c4857d28ebaa824509934556da0b3e76/0 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 drbd.minor_count=8'  -initrd /fs/KVM/initrd-vm-intel12-openwrt-i386-1 -m 256 -smp 1 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -watchdog-action debug -rtc base=localtime -drive file=/fs/KVM/disk0-vm-intel12-openwrt-i386-1,media=disk,if=virtio -drive file=/fs/KVM/disk1-vm-intel12-openwrt-i386-1,media=disk,if=virtio -pidfile /dev/shm/kboot/pid-vm-intel12-openwrt-i386-1 -serial file:/dev/shm/kboot/serial-vm-intel12-openwrt-i386-1 -daemonize -display none -monitor null 





Thanks,
Xiaolong

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