linux-kernel - [fsnotify] ced8959181: kernel BUG at fs/notify/notification.c:66!

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Date:   Fri, 16 Sep 2016 11:24:35 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     Jan Kara <jack@...e.cz>
Cc:     lkp@...org, LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Al Viro <viro@...IV.linux.org.uk>,
        Eric Paris <eparis@...hat.com>,
        Miklos Szeredi <mszeredi@...hat.com>,
        Lino Sanfilippo <LinoSanfilippo@....de>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: [fsnotify]  ced8959181: kernel BUG at
 fs/notify/notification.c:66!


FYI, we noticed the following commit:

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
commit ced89591817caae5d5e1c0c1e76a7f809d004f57 ("fsnotify: convert notification_mutex to a spinlock")

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu kvm64,+ssse3 -smp 2 -m 8G

caused below changes:


+------------------------------------------+------------+------------+
|                                          | f82fa3d0e7 | ced8959181 |
+------------------------------------------+------------+------------+
| boot_successes                           | 8          | 0          |
| boot_failures                            | 0          | 8          |
| kernel_BUG_at_fs/notify/notification.c   | 0          | 8          |
| invalid_opcode:#[##]DEBUG_PAGEALLOC      | 0          | 8          |
| RIP:fsnotify_notify_queue_is_empty       | 0          | 8          |
| calltrace:SyS_poll                       | 0          | 4          |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 8          |
| calltrace:SyS_epoll_ctl                  | 0          | 4          |
+------------------------------------------+------------+------------+



[   17.967731] random: systemd: uninitialized urandom read (16 bytes read)
[   17.969211] random: systemd: uninitialized urandom read (16 bytes read)
[   17.971379] ------------[ cut here ]------------
[   17.972173] kernel BUG at fs/notify/notification.c:66!
[   17.973243] invalid opcode: 0000 [#1] DEBUG_PAGEALLOC
[   17.974000] Modules linked in:
[   17.974487] CPU: 0 PID: 1 Comm: systemd Not tainted 4.8.0-rc6-00236-gced8959 #1
[   17.975597] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[   17.976943] task: ffffa1d9f2be7000 task.stack: ffffa1d9f2bfc000
[   17.977825] RIP: 0010:[<ffffffff979ab459>]  [<ffffffff979ab459>] fsnotify_notify_queue_is_empty+0x9/0x10
[   17.979342] RSP: 0018:ffffa1d9f2bffe58  EFLAGS: 00010297
[   17.980134] RAX: ffffa1d9f2be7000 RBX: ffffa1d9f2bfff00 RCX: ffffa1d9eb8ce408
[   17.981244] RDX: 0000000000000000 RSI: ffffa1d9eb8ce358 RDI: ffffa1d9eb8ce3e8
[   17.982452] RBP: ffffa1d9f2bffe58 R08: 0000000000000004 R09: ffffa1d9eb8ce340
[   17.983499] R10: 00000000000001c4 R11: ffffa1d9eb8ce000 R12: ffffa1d9eb8ce3e8
[   17.984594] R13: ffffa1d9eb8cea00 R14: ffffa1d9eb8ce408 R15: ffffffff979ae630
[   17.985710] FS:  00007f81ac2c5900(0000) GS:ffffffff9801f000(0000) knlGS:0000000000000000
[   17.986903] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   17.987772] CR2: 00007f81aadc12a0 CR3: 000000022a715000 CR4: 00000000000006b0
[   17.988921] Stack:
[   17.989237]  ffffa1d9f2bffe90 ffffffff979ada7f fffffffffffffff4 ffffa1d9eb8ce200
[   17.990420]  317ed0e000000019 ffffa1d9eb8cea00 ffffa1d9ebefdd00 ffffa1d9f2bfff48
[   17.991618]  ffffffff979afd0a ffffa1d9eb8cea00 ffffa1d9eb8cea00 ffffa1d9f2bffed0
[   17.992832] Call Trace:
[   17.993215]  [<ffffffff979ada7f>] inotify_poll+0x5f/0x80
[   17.994015]  [<ffffffff979afd0a>] SyS_epoll_ctl+0x55a/0xce0
[   17.994858]  [<ffffffff979ae630>] ? ep_poll_wakeup_proc+0x30/0x30
[   17.995775]  [<ffffffff97d13bf3>] entry_SYSCALL_64_fastpath+0x1e/0xa8
[   17.996778] Code: 66 90 55 48 89 e5 e8 f7 d4 f0 ff b8 01 00 00 00 0f c1 05 db 8b 86 00 83 c0 01 5d c3 66 0f 1f 44 00 00 55 48 89 e5 e8 d7 d4 f0 ff <0f> 0b 0f 1f 44 00 00 55 48 89 e5 41 54 53 48 89 f3 49 89 fc e8 
[   18.001178] RIP  [<ffffffff979ab459>] fsnotify_notify_queue_is_empty+0x9/0x10
[   18.002268]  RSP <ffffa1d9f2bffe58>
[   18.002809] ---[ end trace 299e1f1032a0eef3 ]---
[   18.003501] Kernel panic - not syncing: Fatal exception





Thanks,
Kernel Test Robot

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