linux-kernel - [lkp-robot] [fscache] 0f845cab95: BUG:unable_to_handle

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Date:   Mon, 2 Apr 2018 11:21:01 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     David Howells <dhowells@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        David Howells <dhowells@...hat.com>, lkp@...org
Subject: [lkp-robot] [fscache]  0f845cab95: BUG:unable_to_handle_kernel


FYI, we noticed the following commit (built with gcc-7):

commit: 0f845cab957c0aef79a51bfc1d5bd9bef2c6a864 ("fscache: Maintain a catalogue of allocated cookies")
https://git.kernel.org/cgit/linux/kernel/git/dhowells/linux-fs.git afs-next

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -m 420M

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


+---------------------------------------------+------------+------------+
|                                             | b5ddac45de | 0f845cab95 |
+---------------------------------------------+------------+------------+
| boot_successes                              | 0          | 0          |
| boot_failures                               | 15         | 16         |
| WARNING:possible_recursive_locking_detected | 15         | 16         |
| BUG:unable_to_handle_kernel                 | 0          | 16         |
| Oops:#[##]                                  | 0          | 16         |
| RIP:fscache_cookie_put                      | 0          | 16         |
| Kernel_panic-not_syncing:Fatal_exception    | 0          | 16         |
+---------------------------------------------+------------+------------+



[    8.262524] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
[    8.263370] IP: fscache_cookie_put+0x70/0xc5
[    8.263837] PGD 0 P4D 0 
[    8.264161] Oops: 0000 [#1] SMP PTI
[    8.264554] Modules linked in:
[    8.270560] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.16.0-rc6-02087-g0f845ca #244
[    8.271391] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[    8.272257] RIP: 0010:fscache_cookie_put+0x70/0xc5
[    8.272769] RSP: 0000:ffffb76240197e60 EFLAGS: 00010246
[    8.273328] RAX: 0000000000006664 RBX: ffff949cebbd3b48 RCX: 0000000000000000
[    8.274048] RDX: 0000000000000000 RSI: 0000000000000007 RDI: ffffffff937049a0
[    8.274776] RBP: ffffffff9173ff80 R08: ffffffff91606b40 R09: 0000000000000000
[    8.275524] R10: ffffb76240197da0 R11: 0000000000000228 R12: dead000000000100
[    8.276240] R13: ffffffff937049a0 R14: ffffffff9268774c R15: 0000000000000000
[    8.276946] FS:  0000000000000000(0000) GS:ffff949cf9c00000(0000) knlGS:0000000000000000
[    8.277803] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.278398] CR2: 0000000000000000 CR3: 0000000032684000 CR4: 00000000000006f0
[    8.279144] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    8.279874] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    8.280607] Call Trace:
[    8.280912]  __fscache_unregister_netfs+0x5b/0x78
[    8.281458]  afs_init+0x3c2/0x412
[    8.281848]  ? trace_event_define_fields_afs_call_state+0xe2/0xe2
[    8.282475]  do_one_initcall+0x9e/0x149
[    8.282902]  kernel_init_freeable+0x1d4/0x25c
[    8.283422]  ? rest_init+0xc4/0xc4
[    8.283808]  kernel_init+0xa/0xf5
[    8.284210]  ret_from_fork+0x3a/0x50
[    8.284644] Code: 00 25 ff 7f 00 00 4c 8d 2c c5 80 16 6d 93 4c 89 ef e8 87 ee ff ff f6 c3 01 48 8b 93 b8 00 00 00 48 8b 8b c0 00 00 00 74 02 0f 0b <48> 8b 01 83 e0 01 48 09 d0 48 85 d2 48 89 01 74 04 48 89 4a 08 
[    8.286534] RIP: fscache_cookie_put+0x70/0xc5 RSP: ffffb76240197e60
[    8.287211] CR2: 0000000000000000
[    8.287592] ---[ end trace ce5706455109e764 ]---


To reproduce:

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script  # job-script is attached in this email



Thanks,
Xiaolong

View attachment "config-4.16.0-rc6-02087-g0f845ca" of type "text/plain" (165866 bytes)

View attachment "job-script" of type "text/plain" (4009 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (25848 bytes)