linux-kernel - [lkp] [hrtimer] 512d7dce5e: BUG: unable to handle kernel NULL pointer dereference at 0000000000000018

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Date:	Mon, 14 Dec 2015 11:02:05 +0800
From:	kernel test robot <ying.huang@...ux.intel.com>
TO:	Marc Zyngier <marc.zyngier@....com>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: [lkp] [hrtimer] 512d7dce5e: BUG: unable to handle kernel NULL
 pointer dereference at 0000000000000018

FYI, we noticed the below changes on

https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git hrtimer/monotonic-raw
commit 512d7dce5e97b2242cd50032ae7cf56c63342f2c ("hrtimer: Catch illegal clockids")


+----------------+------------+------------+
|                | f144b63298 | 512d7dce5e |
+----------------+------------+------------+
| boot_successes | 44         | 0          |
+----------------+------------+------------+

[    1.171029] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
[    1.171035] IP: [<ffffffff8bafac73>] __hrtimer_get_next_event+0x33/0x70
[    1.171037] PGD 0 
[    1.171039] Oops: 0000 [#1] SMP 
[    1.171041] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.4.0-rc4-00002-g512d7dc #2
[    1.171042] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[    1.171044] task: ffff8800001a8000 ti: ffff88000017c000 task.ti: ffff88000017c000
[    1.171046] RIP: 0010:[<ffffffff8bafac73>]  [<ffffffff8bafac73>] __hrtimer_get_next_event+0x33/0x70
[    1.171047] RSP: 0000:ffff880013c03ee0  EFLAGS: 00010002
[    1.171049] RAX: 7fffffffffffffff RBX: ffff880013dcd900 RCX: ffff880013dcdb00
[    1.171050] RDX: 0000000000000001 RSI: 000001cd42e4dffb RDI: ffff880013dcd900
[    1.171050] RBP: ffff880013c03ee0 R08: 0000000000000000 R09: 0000000000000000
[    1.171051] R10: 0000000000006df8 R11: ffffffff8da362ed R12: ffff880013dcd900
[    1.171052] R13: 0000000000000000 R14: ffffffff8da3dda8 R15: 0000000000000000
[    1.171054] FS:  0000000000000000(0000) GS:ffff880013c00000(0000) knlGS:0000000000000000
[    1.171055] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[    1.171056] CR2: 0000000000000018 CR3: 000000000ca09000 CR4: 00000000000006f0
[    1.171060] Stack:
[    1.171062]  ffff880013c03ef8 ffffffff8bafb0c5 ffff880013dcd900 ffff880013c03f18
[    1.171064]  ffffffff8bafbb3e ffff8800001a8000 0000000000000000 ffff880013c03f38
[    1.171066]  ffffffff8bafab02 ffff880013c0c500 7fffffffffffffff ffff880013c03f50
[    1.171067] Call Trace:
[    1.171071]  <IRQ> 
[    1.171071]  [<ffffffff8bafb0c5>] retrigger_next_event+0x65/0x90
[    1.171073]  [<ffffffff8bafbb3e>] hrtimer_run_queues+0x6e/0xd0
[    1.171075]  [<ffffffff8bafab02>] update_process_times+0x22/0x60
[    1.171078]  [<ffffffff8bb0764a>] tick_periodic+0x2a/0xb0
[    1.171080]  [<ffffffff8bb076f0>] ? tick_handle_periodic+0x20/0x70
[    1.171082]  [<ffffffff8bb076f0>] tick_handle_periodic+0x20/0x70
[    1.171085]  [<ffffffff8ba2d083>] smp_trace_apic_timer_interrupt+0x63/0x90
[    1.171086]  [<ffffffff8ba2d0b9>] smp_apic_timer_interrupt+0x9/0x10
[    1.171090]  [<ffffffff8c2f8c44>] apic_timer_interrupt+0x84/0x90
[    1.171094]  <EOI> 
[    1.171094]  [<ffffffff8bd94945>] ? serial8250_console_write+0xe5/0x220
[    1.171098]  [<ffffffff8bae8f50>] ? console_unlock+0x2f0/0x530
[    1.171101]  [<ffffffff8bae948f>] vprintk_emit+0x2ff/0x560
[    1.171102]  [<ffffffff8bae980a>] vprintk_default+0x1a/0x20
[    1.171105]  [<ffffffff8bb33316>] printk+0x43/0x4b
[    1.171107]  [<ffffffff8bb03d67>] __clocksource_select+0xd7/0x110
[    1.171111]  [<ffffffff8ce69c0e>] ? ntp_init+0xb/0xb
[    1.171112]  [<ffffffff8ce69c42>] clocksource_done_booting+0x34/0x44
[    1.171115]  [<ffffffff8ce51f5f>] do_one_initcall+0xe2/0x172
[    1.171116]  [<ffffffff8ce521a8>] kernel_init_freeable+0x1b9/0x23c
[    1.171119]  [<ffffffff8c2f0ff0>] ? rest_init+0xd0/0xd0
[    1.171121]  [<ffffffff8c2f0ff9>] kernel_init+0x9/0xe0
[    1.171123]  [<ffffffff8c2f829f>] ret_from_fork+0x3f/0x70
[    1.171125]  [<ffffffff8c2f0ff0>] ? rest_init+0xd0/0xd0
[    1.171152] Code: c7 87 a0 00 00 00 00 00 00 00 48 89 e5 85 d2 74 47 48 8d 8f c0 00 00 00 48 b8 ff ff ff ff ff ff ff 7f f6 c2 01 74 1b 4c 8b 41 18 <49> 8b 70 18 48 2b 71 28 48 39 c6 7d 0a 4c 89 87 a0 00 00 00 48 
[    1.171155] RIP  [<ffffffff8bafac73>] __hrtimer_get_next_event+0x33/0x70
[    1.171155]  RSP <ffff880013c03ee0>
[    1.171156] CR2: 0000000000000018
[    1.171162] ---[ end trace 164f7953b3ea131d ]---
[    1.171163] Kernel panic - not syncing: Fatal exception in interrupt


Thanks,
Kernel Test Robot

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