Date:	Fri, 27 Feb 2015 09:53:59 -0500
From:	"Justin Piszcz" <jpiszcz@...idpixels.com>
To:	<linux-kernel@...r.kernel.org>
Subject: 3.19 kernel: BUG: unable to handle kernel NULL pointer dereference

Hello,

With kernel 3.15, I do not recall having any issues, with 3.19, I am getting
a kernel crash when I copy files over NFS from machine A to B.
Is this a known issue?

I suspect it has to do something with this:
Feb 27 09:31:20 remote-host [   15.745342] dmar: DRHD: handling fault status
reg 2
Feb 27 09:31:20 remote-host [   15.745361] dmar: DMAR:[DMA Read] Request
device [04:00.0] fault addr 0 #012[   15.745361] DMAR:[fault reason 06] PTE
Read access is not set

Logs from netconsole during kernel crash:
Feb 27 09:31:19 atom kernel: [ 2296.410022] ixgbe 0000:01:00.0 eth4: NIC
Link is Up 10 Gbps, Flow Control: RX/TX
Feb 27 09:31:19 remote-host [   15.138220] ixgbe 0000:86:00.0 eth2: NIC Link
is Up 10 Gbps, Flow Control: RX/TX
Feb 27 09:31:19 remote-host [   15.138370] IPv6: ADDRCONF(NETDEV_CHANGE):
eth2: link becomes ready
Feb 27 09:31:20 remote-host [   15.565505] systemd-logind[3863]: Failed to
start user service: Unknown unit: user@...0.service
Feb 27 09:31:20 remote-host [   15.569093] systemd-logind[3863]: New session
c2 of user user.
Feb 27 09:31:20 remote-host [   15.745342] dmar: DRHD: handling fault status
reg 2
Feb 27 09:31:20 remote-host [   15.745361] dmar: DMAR:[DMA Read] Request
device [04:00.0] fault addr 0 #012[   15.745361] DMAR:[fault reason 06] PTE
Read access is not set
Feb 27 09:31:23 remote-host [   18.719490] xfsettingsd[4040]: segfault at 20
ip 00007f23665916b7 sp 00007fff80d9d4b0 error 4
Feb 27 09:31:23 remote-host  in
libxfce4kbd-private-2.so.0.0.0[7f236658c000+9000]
Feb 27 09:31:23 remote-host  
Feb 27 09:31:24 remote-host [   20.241049] systemd-logind[3863]: New session
c3 of user user.
Feb 27 09:31:57 remote-host [   52.361903] systemd-logind[3863]: New session
c4 of user user.
Feb 27 09:32:10 remote-host [   65.621540] NFSD: Using
/var/lib/nfs/v4recovery as the NFSv4 state recovery directory
Feb 27 09:32:10 remote-host [   65.621827] NFSD: starting 90-second grace
period (net ffffffff81b82000)
Feb 27 09:36:01 atom kernel: [ 2578.355223] device eth0 left promiscuous
mode
Feb 27 09:43:29 remote-host [  745.070043] systemd-logind[3863]: New session
c5 of user user.
Feb 27 09:44:18 remote-host [  794.622189] systemd-logind[3863]: Removed
session c5.
Feb 27 09:44:21 remote-host [  797.309290] systemd-logind[3863]: New session
c6 of user user.
Feb 27 09:45:21 remote-host [  857.360193] systemd-logind[3863]: New session
c7 of user user.
Feb 27 09:45:32 remote-host [  868.472759] systemd-logind[3863]: Removed
session c7.
Feb 27 09:46:09 atom rsyslogd: -- MARK --
Feb 27 09:49:17 remote-host [ 1093.754960] BUG: unable to handle kernel 
Feb 27 09:49:17 NULL pointer dereference
Feb 27 09:49:17 remote-host  at 0000000000000010
Feb 27 09:49:17 remote-host [ 1093.758337] IP:
Feb 27 09:49:17 remote-host  [<ffffffff814b7160>] intel_unmap_sg+0x0/0x10
Feb 27 09:49:17 remote-host [ 1093.760661] PGD 0 
Feb 27 09:49:17 remote-host  
Feb 27 09:49:17 remote-host [ 1093.761481] Oops: 0000 [#1] 
Feb 27 09:49:17 SMP  
Feb 27 09:49:17 remote-host  
Feb 27 09:49:17 remote-host [ 1093.762837] CPU: 6 PID: 0 Comm: swapper/6 Not
tainted 3.19.0 #2
Feb 27 09:49:17 remote-host [ 1093.765189] Hardware name: Supermicro
X8DTH-i/6/iF/6F/X8DTH, BIOS 2.1b       05/04/12  
Feb 27 09:49:17 remote-host [ 1093.768377] task: ffff880624600010 ti:
ffff880624630000 task.ti: ffff880624630000
Feb 27 09:49:17 remote-host [ 1093.771354] RIP: 0010:[<ffffffff814b7160>] 
Feb 27 09:49:17 remote-host  [<ffffffff814b7160>] intel_unmap_sg+0x0/0x10
Feb 27 09:49:17 remote-host [ 1093.774615] RSP: 0018:ffff880c3fc03ea0
EFLAGS: 00010046
Feb 27 09:49:17 remote-host [ 1093.776717] RAX: ffff880623d2b098 RBX:
ffff880c231706d8 RCX: 0000000000000001
Feb 27 09:49:17 remote-host [ 1093.779553] RDX: 0000000000000005 RSI:
0000000000000000 RDI: ffff880623d2b098
Feb 27 09:49:17 remote-host [ 1093.782390] RBP: 0000000000000008 R08:
0000000000000000 R09: ffffffff814b7160
Feb 27 09:49:17 remote-host [ 1093.785227] R10: 0000000000000000 R11:
0000000000000045 R12: ffff880c23174c30
Feb 27 09:49:17 remote-host [ 1093.788063] R13: 000000006ef5de4d R14:
00000000000000e0 R15: 00000000000006e2
Feb 27 09:49:17 remote-host [ 1093.790900] FS:  0000000000000000(0000)
GS:ffff880c3fc00000(0000) knlGS:0000000000000000
Feb 27 09:49:17 remote-host [ 1093.794122] CS:  0010 DS: 0000 ES: 0000 CR0:
000000008005003b
Feb 27 09:49:17 remote-host [ 1093.796399] CR2: 0000000000000010 CR3:
0000000001ad2000 CR4: 00000000000007e0
Feb 27 09:49:17 remote-host [ 1093.799235] Stack:
Feb 27 09:49:17 remote-host [ 1093.800009]  ffffffff815e5005
Feb 27 09:49:17 remote-host  ffffffff81b2f888
Feb 27 09:49:17 remote-host  ffff880c00000040
Feb 27 09:49:17 remote-host  ffff880c3fc03eb8
Feb 27 09:49:17 remote-host  
Feb 27 09:49:17 remote-host [ 1093.803103]  ffff880c3fc03eb8
Feb 27 09:49:17 remote-host  ffff880c3fc03ec8
Feb 27 09:49:17 remote-host  ffff880624372d40
Feb 27 09:49:17 remote-host  ffff880624633e18
Feb 27 09:49:17 remote-host  
Feb 27 09:49:17 remote-host [ 1093.806196]  0000000000000000
Feb 27 09:49:17 remote-host  0000000000000000
Feb 27 09:49:17 remote-host  0000000000000040
Feb 27 09:49:17 remote-host  ffff880c23e52e00
Feb 27 09:49:17 remote-host  
Feb 27 09:49:17 remote-host [ 1093.809290] Call Trace:
Feb 27 09:49:17 remote-host [ 1093.810240]  <IRQ> 
Feb 27 09:49:17 remote-host  
Feb 27 09:49:17 remote-host [ 1093.811048] 
Feb 27 09:49:17 remote-host  [<ffffffff815e5005>] ?
twl_interrupt+0x425/0x720
Feb 27 09:49:17 remote-host [ 1093.813409]  [<ffffffff8110baf5>] ?
handle_irq_event_percpu+0x55/0x100
Feb 27 09:49:17 remote-host [ 1093.816002]  [<ffffffff8110bbcc>] ?
handle_irq_event+0x2c/0x50
Feb 27 09:49:17 remote-host [ 1093.818316]  [<ffffffff8110e7e6>] ?
handle_edge_irq+0x96/0x140
Feb 27 09:49:17 remote-host [ 1093.820631]  [<ffffffff8103f195>] ?
handle_irq+0x15/0x30
Feb 27 09:49:17 remote-host [ 1093.822734]  [<ffffffff8103efc1>] ?
do_IRQ+0x41/0xd0
Feb 27 09:49:17 remote-host [ 1093.824700]  [<ffffffff8186e02a>] ?
common_interrupt+0x6a/0x6a
Feb 27 09:49:17 remote-host [ 1093.827012]  <EOI> 
Feb 27 09:49:17 remote-host  
Feb 27 09:49:17 remote-host [ 1093.827820] 
Feb 27 09:49:17 remote-host  [<ffffffff81719405>] ?
cpuidle_enter_state+0x45/0xc0
Feb 27 09:49:17 remote-host [ 1093.830317]  [<ffffffff817193fa>] ?
cpuidle_enter_state+0x3a/0xc0
Feb 27 09:49:17 remote-host [ 1093.832738]  [<ffffffff81104817>] ?
cpu_startup_entry+0x277/0x2f0
Feb 27 09:49:17 remote-host [ 1093.835158]  [<ffffffff8186cdd5>] ?
_raw_spin_unlock_irqrestore+0x5/0x10
Feb 27 09:49:17 remote-host [ 1093.837820] Code: 
Feb 27 09:49:17 e7  
Feb 27 09:49:17 5b  
Feb 27 09:49:17 5d  
Feb 27 09:49:17 41  
Feb 27 09:49:17 5d  
Feb 27 09:49:17 41  
Feb 27 09:49:17 5e  
Feb 27 09:49:17 41  
Feb 27 09:49:17 5f  
Feb 27 09:49:17 e9  
Feb 27 09:49:17 db  
Feb 27 09:49:17 e5  
Feb 27 09:49:17 ff  
Feb 27 09:49:17 ff  
Feb 27 09:49:17 0f  
Feb 27 09:49:17 1f  
Feb 27 09:49:17 00  
Feb 27 09:49:17 0f  
Feb 27 09:49:17 0b  
Feb 27 09:49:17 66  
Feb 27 09:49:17 0f  
Feb 27 09:49:17 1f  
Feb 27 09:49:17 44  
Feb 27 09:49:17 00  
Feb 27 09:49:17 00  
Feb 27 09:49:17 e8  
Feb 27 09:49:17 1b  
Feb 27 09:49:17 e6  
Feb 27 09:49:17 ff  
Feb 27 09:49:17 ff  
Feb 27 09:49:17 e9  
Feb 27 09:49:17 c7  
Feb 27 09:49:17 fe  
Feb 27 09:49:17 ff  
Feb 27 09:49:17 ff  
Feb 27 09:49:17 66  
Feb 27 09:49:17 0f  
Feb 27 09:49:17 1f  
Feb 27 09:49:17 44  
Feb 27 09:49:17 00  
Feb 27 09:49:17 00  
Feb 27 09:49:17 8b  
Feb 27 09:49:17 76  
Feb 27 09:49:17 10  
Feb 27 09:49:17 e9  
Feb 27 09:49:17 07  
Feb 27 09:49:17 fe  
Feb 27 09:49:17 ff  
Feb 27 09:49:17 ff  
Feb 27 09:49:17 0f  
Feb 27 09:49:17 1f  
Feb 27 09:49:17 80  
Feb 27 09:49:17 00  
Feb 27 09:49:17 00  
Feb 27 09:49:17 00  
Feb 27 09:49:17 00  
Feb 27 09:49:17 e9  
Feb 27 09:49:17 fb  
Feb 27 09:49:17 fd  
Feb 27 09:49:17 ff  
Feb 27 09:49:17 ff  
Feb 27 09:49:17 remote-host  
Feb 27 09:49:17 remote-host [ 1093.847921] RIP 
Feb 27 09:49:17 remote-host  [<ffffffff814b7160>] intel_unmap_sg+0x0/0x10
Feb 27 09:49:17 remote-host [ 1093.850238]  RSP <ffff880c3fc03ea0>
Feb 27 09:49:17 remote-host [ 1093.851607] CR2: 0000000000000010
Feb 27 09:49:18 remote-host [ 1095.111283] ---[ end trace 501d5952594f8825
]---
Feb 27 09:49:18 remote-host [ 1095.111320] Kernel panic - not syncing: Fatal
exception in interrupt
Feb 27 09:49:18 remote-host [ 1095.114369] Kernel Offset: 0x0 from
0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffff9fffffff)
Feb 27 09:49:18 remote-host [ 1095.118435] drm_kms_helper: panic occurred,
switching back to text console
Feb 27 09:49:18 remote-host [ 1095.121166] ---[ end Kernel panic - not
syncing: Fatal exception in interrupt
Feb 27 09:49:18 remote-host [ 1095.121176] ------------[ cut here
]------------
Feb 27 09:49:18 remote-host [ 1095.121183] WARNING: CPU: 6 PID: 0 at
arch/x86/kernel/smp.c:124 update_process_times+0x49/0x60()
Feb 27 09:49:18 remote-host [ 1095.121187] CPU: 6 PID: 0 Comm: swapper/6
Tainted: G      D        3.19.0 #2
Feb 27 09:49:18 remote-host [ 1095.121190] Hardware name: Supermicro
X8DTH-i/6/iF/6F/X8DTH, BIOS 2.1b       05/04/12  
Feb 27 09:49:18 remote-host [ 1095.121193]  0000000000000000
Feb 27 09:49:18 remote-host  ffffffff81a26a3c
Feb 27 09:49:18 remote-host  ffffffff81867dad
Feb 27 09:49:18 remote-host  0000000000000000
Feb 27 09:49:18 remote-host  
Feb 27 09:49:18 remote-host [ 1095.121206]  ffffffff810d3782
Feb 27 09:49:18 remote-host  ffff880624600010
Feb 27 09:49:18 remote-host  0000000000000000
Feb 27 09:49:18 remote-host  ffff880c3fc03b38
Feb 27 09:49:18 remote-host  
Feb 27 09:49:18 remote-host [ 1095.121218]  0000000000000000
Feb 27 09:49:18 remote-host  ffff880c3fc0d238
Feb 27 09:49:18 remote-host  ffffffff81115fd9
Feb 27 09:49:18 remote-host  ffff880c3fc0d200
Feb 27 09:49:18 remote-host  
Feb 27 09:49:18 remote-host [ 1095.121229] Call Trace:
Feb 27 09:49:18 remote-host [ 1095.121232]  <IRQ> 
Feb 27 09:49:18 remote-host  [<ffffffff81867dad>] ? dump_stack+0x40/0x50
Feb 27 09:49:18 remote-host [ 1095.121244]  [<ffffffff810d3782>] ?
warn_slowpath_common+0x72/0xb0
Feb 27 09:49:18 remote-host [ 1095.121248]  [<ffffffff81115fd9>] ?
update_process_times+0x49/0x60
Feb 27 09:49:18 remote-host [ 1095.121254]  [<ffffffff81123923>] ?
tick_sched_timer+0x33/0x70
Feb 27 09:49:18 remote-host [ 1095.121258]  [<ffffffff811164a0>] ?
__run_hrtimer.isra.34+0x40/0x100
Feb 27 09:49:18 remote-host [ 1095.121263]  [<ffffffff81116d1f>] ?
hrtimer_interrupt+0xef/0x240
Feb 27 09:49:18 remote-host [ 1095.121269]  [<ffffffff810673f4>] ?
smp_apic_timer_interrupt+0x34/0x50
Feb 27 09:49:18 remote-host [ 1095.121273]  [<ffffffff8186e2ea>] ?
apic_timer_interrupt+0x6a/0x70
Feb 27 09:49:18 remote-host [ 1095.121277]  [<ffffffff81866fb0>] ?
panic+0x191/0x1c9
Feb 27 09:49:18 remote-host [ 1095.121281]  [<ffffffff81866fad>] ?
panic+0x18e/0x1c9
Feb 27 09:49:18 remote-host [ 1095.121285]  [<ffffffff81040685>] ?
oops_end+0x85/0xa0
Feb 27 09:49:18 remote-host [ 1095.121290]  [<ffffffff8106fcb4>] ?
no_context+0x134/0x380
Feb 27 09:49:18 remote-host [ 1095.121294]  [<ffffffff810703de>] ?
__do_page_fault+0x9e/0x4c0
Feb 27 09:49:18 remote-host [ 1095.121299]  [<ffffffff814b2be1>] ?
dma_pte_clear_level+0x121/0x1b0
Feb 27 09:49:18 remote-host [ 1095.121304]  [<ffffffff8186ea72>] ?
page_fault+0x22/0x30
Feb 27 09:49:18 remote-host [ 1095.121308]  [<ffffffff814b7160>] ?
intel_unmap+0x1f0/0x1f0
Feb 27 09:49:18 remote-host [ 1095.121312]  [<ffffffff814b7160>] ?
intel_unmap+0x1f0/0x1f0
Feb 27 09:49:18 remote-host [ 1095.121316]  [<ffffffff815e5005>] ?
twl_interrupt+0x425/0x720
Feb 27 09:49:18 remote-host [ 1095.121320]  [<ffffffff8110baf5>] ?
handle_irq_event_percpu+0x55/0x100
Feb 27 09:49:18 remote-host [ 1095.121324]  [<ffffffff8110bbcc>] ?
handle_irq_event+0x2c/0x50
Feb 27 09:49:18 remote-host [ 1095.121328]  [<ffffffff8110e7e6>] ?
handle_edge_irq+0x96/0x140
Feb 27 09:49:18 remote-host [ 1095.121332]  [<ffffffff8103f195>] ?
handle_irq+0x15/0x30
Feb 27 09:49:18 remote-host [ 1095.121335]  [<ffffffff8103efc1>] ?
do_IRQ+0x41/0xd0
Feb 27 09:49:18 remote-host [ 1095.121339]  [<ffffffff8186e02a>] ?
common_interrupt+0x6a/0x6a
Feb 27 09:49:18 remote-host [ 1095.121342]  <EOI> 
Feb 27 09:49:18 remote-host  [<ffffffff81719405>] ?
cpuidle_enter_state+0x45/0xc0
Feb 27 09:49:18 remote-host [ 1095.121349]  [<ffffffff817193fa>] ?
cpuidle_enter_state+0x3a/0xc0
Feb 27 09:49:18 remote-host [ 1095.121353]  [<ffffffff81104817>] ?
cpu_startup_entry+0x277/0x2f0
Feb 27 09:49:18 remote-host [ 1095.121357]  [<ffffffff8186cdd5>] ?
_raw_spin_unlock_irqrestore+0x5/0x10
Feb 27 09:49:18 remote-host [ 1095.121361] ---[ end trace 501d5952594f8826
]---

Justin.

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