linux-kernel - [mm] 68ab21008a: BUG:unable_to_handle

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Message-ID: <20161125212009.GA119711@inn.lkp.intel.com>
Date:   Sat, 26 Nov 2016 05:20:09 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     Miklos Szeredi <mszeredi@...hat.com>
Cc:     linux-unionfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, lkp@...org
Subject: [mm]  68ab21008a: BUG:unable_to_handle_kernel

FYI, we noticed the following commit:

commit 68ab21008a656abeb1fe2c7117a67eeab4d68ded ("mm: ovl: copy-up on MAP_SHARED")
url: https://github.com/0day-ci/linux/commits/Miklos-Szeredi/overlayfs-fix-ro-rw-fd-data-inconsistecies/20161124-233654
base: https://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs.git overlayfs-next

in testcase: trinity
with following parameters:

	runtime: 300s

test-description: Trinity is a linux system call fuzz tester.
test-url: http://codemonkey.org.uk/projects/trinity/


on test machine: qemu-system-x86_64 -enable-kvm -cpu IvyBridge -m 360M

caused below changes:


+------------------------------------------+------------+------------+
|                                          | b45dbaab96 | 68ab21008a |
+------------------------------------------+------------+------------+
| boot_successes                           | 4          | 0          |
| boot_failures                            | 0          | 5          |
| BUG:unable_to_handle_kernel              | 0          | 5          |
| Oops                                     | 0          | 5          |
| RIP:vm_mmap_pgoff                        | 0          | 5          |
| calltrace:SyS_mmap_pgoff                 | 0          | 5          |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 5          |
+------------------------------------------+------------+------------+



[    5.829350] job=/lkp/scheduled/vm-ivb41-yocto-ia32-22/trinity-300s-yocto-tiny-i386-2016-04-22.cgz-68ab21008a656abeb1fe2c7117a67eeab4d68ded-20161126-104135-1r99nk0-0.yaml
[    5.829350] run-job /lkp/scheduled/vm-ivb41-yocto-ia32-22/trinity-300s-yocto-tiny-i386-2016-04-22.cgz-68ab21008a656abeb1fe2c7117a67eeab4d68ded-20161126-104135-1r99nk0-0.yaml
[    5.829350] /bin/busybox wget -q http://inn:80/~lkp/cgi-bin/lkp-jobfile-append-var?job_file=/lkp/scheduled/vm-ivb41-yocto-ia32-22/trinity-300s-yocto-tiny-i386-2016-04-22.cgz-68ab21008a656abeb1fe2c7117a67eeab4d68ded-20161126-104135-1r99nk0-0.yaml&job_state=running -O /dev/null
[   16.146778] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
[   16.150092] IP: [<ffffffff811eb290>] vm_mmap_pgoff+0x63/0xe7
[   16.152858] PGD 71bf067 
[   16.153453] PUD 688b067 
PMD 0 
[   16.154890] 
[   16.156053] Oops: 0000 [#1] SMP
[   16.157251] Modules linked in:
[   16.158444] CPU: 0 PID: 1483 Comm: trinity Not tainted 4.9.0-rc4-00032-g68ab210 #1
[   16.160691] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[   16.162901] task: ffff880006cc1c00 task.stack: ffffc9000027c000
[   16.164145] RIP: 0010:[<ffffffff811eb290>]  [<ffffffff811eb290>] vm_mmap_pgoff+0x63/0xe7
[   16.166525] RSP: 0000:ffffc9000027fe90  EFLAGS: 00010246
[   16.167620] RAX: ffff880006cc1c00 RBX: 0000000000000000 RCX: 0000000000000001
[   16.169186] RDX: 0000000000001000 RSI: 0000000000000000 RDI: 0000000000000000
[   16.170761] RBP: ffffc9000027fed8 R08: 0000000000000021 R09: 0000000000000000
[   16.172283] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
[   16.173878] R13: 0000000000001000 R14: ffff880006cc8800 R15: 0000000000000000
[   16.175332] FS:  0000000000000000(0000) GS:ffff880016000000(0063) knlGS:0000000009af2840
[   16.177455] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   16.178827] CR2: 0000000000000018 CR3: 00000000071b4000 CR4: 00000000001406f0
[   16.180266] Stack:
[   16.181094]  0000000000000000 0000000000001000 0000000000000000 ffff880004b6ff00
[   16.183365]  0000000000001000 0000000000000021 0000000000001000 0000000000000000
[   16.185548]  0000000000000000 ffffc9000027ff30 ffffffff812036f8 0000000600270000
[   16.187824] Call Trace:
[   16.188656]  [<ffffffff812036f8>] SyS_mmap_pgoff+0x184/0x1a9
[   16.189918]  [<ffffffff810019e8>] do_int80_syscall_32+0x64/0xbf
[   16.191138]  [<ffffffff81ae3938>] entry_INT80_compat+0x38/0x50
[   16.192397] Code: 03 00 00 75 21 49 83 c6 68 4c 89 45 b8 49 c7 c5 fc ff ff ff 4c 89 f7 e8 c0 4c 8f 00 85 c0 4c 8b 45 b8 75 79 eb 37 f6 c1 02 75 da <48> 8b 47 18 8b 10 0f ba e2 1a 73 19 48 8b 48 60 4c 89 45 b8 ba 
[   16.201562] RIP  [<ffffffff811eb290>] vm_mmap_pgoff+0x63/0xe7
[   16.203254]  RSP <ffffc9000027fe90>
[   16.204501] CR2: 0000000000000018
[   16.206063] ---[ end trace 910d3120db07d449 ]---
[   16.226016] Kernel panic - not syncing: Fatal exception
[   16.227115] Kernel Offset: disabled

Elapsed time: 20


To reproduce:

        git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script  # job-script is attached in this email



Thanks,
Kernel Test Robot

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