Date:   Mon, 4 Sep 2017 09:26:58 +0200
From:   Michael Stapelberg <michael+lkml@...pelberg.ch>
To:     linux-kernel@...r.kernel.org
Subject: BUG: bfq scheduler results in soft lockup

Hey,

I recently tried enabling the bfq scheduler by booting with
scsi_mod.use_blk_mq=1 and selecting the scheduler using the following
/etc/udev/rules.d/60-scheduler.rules:

ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/scheduler}="bfq"

I’m using an INTEL SSDSC2BP48 disk.

The system boots up fine, but as soon as I try to start chrome, it
locks up. This is what I got via netconsole:

[  204.799350] INFO: rcu_sched detected stalls on CPUs/tasks:
[  204.799356] 0-...: (1 GPs behind) idle=e82/140000000000000/0
softirq=5404/5407 fqs=2
[  204.799358] 1-...: (1 GPs behind) idle=e2a/140000000000000/0
softirq=4218/4227 fqs=2
[  204.799360] 2-...: (1 GPs behind) idle=47e/140000000000000/0
softirq=5774/5818 fqs=2
[  204.799361] 6-...: (1 GPs behind) idle=2d2/140000000000000/0
softirq=4241/4243 fqs=2
[  204.799363] 7-...: (1 GPs behind) idle=53e/140000000000000/0
softirq=4998/4999 fqs=2
[  204.799364] (detected by 3, t=5252 jiffies, g=3910, c=3909, q=1199)
[  204.799367] Sending NMI from CPU 3 to CPUs 0:
[  204.800361] NMI backtrace for cpu 0
[  204.800361] CPU: 0 PID: 2585 Comm: chrome Tainted: G           O
4.12.0-1-amd64 #1 Debian 4.12.6-1
[  204.800362] Hardware name: Supermicro Super Server/X11SSZ-QF, BIOS
1.0a 11/09/2015
[  204.800362] task: ffff89ce04fdd080 task.stack: ffff9a54c668c000
[  204.800362] RIP: 0010:native_queued_spin_lock_slowpath+0x10f/0x190
[  204.800362] RSP: 0000:ffff9a54c668fa80 EFLAGS: 00000046
[  204.800363] RAX: 0000000000000000 RBX: ffff89ce0804b000 RCX: ffff89ce32c1b9c0
[  204.800363] RDX: 0000000000000006 RSI: 00000000001c0001 RDI: ffff89ce03544760
[  204.800363] RBP: ffff9a54c668fae8 R08: 0000000000040000 R09: 0000000000000000
[  204.800363] R10: 00000000184e2acf R11: ffff89ce03544400 R12: ffff89ce03544760
[  204.800364] R13: ffff9a54c668fae8 R14: ffff89ce0853a800 R15: ffff89ce09320040
[  204.800364] FS:  00007f4e8271aac0(0000) GS:ffff89ce32c00000(0000)
knlGS:0000000000000000
[  204.800364] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  204.800364] CR2: 0000555f64c8a1a0 CR3: 00000007d0b33000 CR4: 00000000003406f0
[  204.800365] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  204.800365] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  204.800365] Call Trace:
[  204.800365]  ? _raw_spin_lock_irq+0x24/0x30
[  204.800365]  ? bfq_dispatch_request+0x34/0x910 [bfq]
[  204.800365]  ? blk_mq_sched_dispatch_requests+0x170/0x1e0
[  204.800366]  ? __blk_mq_delay_run_hw_queue+0x91/0xa0
[  204.800366]  ? blk_mq_flush_plug_list+0x184/0x260
[  204.800366]  ? blk_flush_plug_list+0xf2/0x280
[  204.800366]  ? blk_finish_plug+0x27/0x40
[  204.800366]  ? __do_page_cache_readahead+0x210/0x2d0
[  204.800367]  ? find_get_entry+0x19/0xc0
[  204.800367]  ? filemap_fault+0x42d/0x620
[  204.800367]  ? filemap_fault+0x42d/0x620
[  204.800367]  ? filemap_map_pages+0x182/0x330
[  204.800367]  ? ext4_filemap_fault+0x2c/0x40 [ext4]
[  204.800368]  ? __do_fault+0x19/0xb0
[  204.800368]  ? __handle_mm_fault+0xab9/0xf80
[  204.800368]  ? handle_mm_fault+0xee/0x210
[  204.800368]  ? __do_page_fault+0x2a4/0x510
[  204.800368]  ? page_fault+0x28/0x30
[  204.800368] Code: 41 c1 ea 12 83 e0 03 83 ea 01 48 c1 e0 04 48 63
d2 48 05 c0 b9 01 00 48 03 04 d5 e0 c3 e7 9b 48 89 08 8b 41 08 85 c0
75 09 f3 90 <8b> 41 08 85 c0 74 f7 4c 8b 09 4d 85 c9 74 08 41 0f 0d 09
eb 02
[  204.800375] Sending NMI from CPU 3 to CPUs 1:
[  204.801395] NMI backtrace for cpu 1
[  204.801396] CPU: 1 PID: 214 Comm: kworker/1:1H Tainted: G
O    4.12.0-1-amd64 #1 Debian 4.12.6-1
[  204.801396] Hardware name: Supermicro Super Server/X11SSZ-QF, BIOS
1.0a 11/09/2015
[  204.801396] Workqueue: kblockd blk_mq_run_work_fn
[  204.801396] task: ffff89ce093490c0 task.stack: ffff9a54c3c04000
[  204.801397] RIP: 0010:native_queued_spin_lock_slowpath+0x10f/0x190
[  204.801397] RSP: 0000:ffff9a54c3c07dc0 EFLAGS: 00000046
[  204.801397] RAX: 0000000000000000 RBX: ffff89ce0804b000 RCX: ffff89ce32c5b9c0
[  204.801397] RDX: 0000000000000000 RSI: 0000000000040001 RDI: ffff89ce03544760
[  204.801398] RBP: ffff9a54c3c07e28 R08: 0000000000080000 R09: 0000000000000000
[  204.801398] R10: ffff9a54c3b1fd70 R11: ffffffffc06e1858 R12: ffff89ce03544760
[  204.801398] R13: 0000000000000001 R14: ffff89ce0853a800 R15: ffff89ce09320040
[  204.801398] FS:  0000000000000000(0000) GS:ffff89ce32c40000(0000)
knlGS:0000000000000000
[  204.801399] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  204.801399] CR2: 000017e7ea4ec008 CR3: 00000007bcc85000 CR4: 00000000003406e0
[  204.801399] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  204.801399] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  204.801399] Call Trace:
[  204.801400]  ? _raw_spin_lock_irq+0x24/0x30
[  204.801400]  ? bfq_dispatch_request+0x34/0x910 [bfq]
[  204.801400]  ? __switch_to+0x234/0x430
[  204.801400]  ? blk_mq_sched_dispatch_requests+0x170/0x1e0
[  204.801400]  ? process_one_work+0x181/0x370
[  204.801400]  ? worker_thread+0x4d/0x3a0
[  204.801401]  ? kthread+0xfc/0x130
[  204.801401]  ? process_one_work+0x370/0x370
[  204.801401]  ? kthread_create_on_node+0x70/0x70
[  204.801401]  ? ret_from_fork+0x25/0x30
[  204.801401] Code: 41 c1 ea 12 83 e0 03 83 ea 01 48 c1 e0 04 48 63
d2 48 05 c0 b9 01 00 48 03 04 d5 e0 c3 e7 9b 48 89 08 8b 41 08 85 c0
75 09 f3 90 <8b> 41 08 85 c0 74 f7 4c 8b 09 4d 85 c9 74 08 41 0f 0d 09
eb 02
[  204.801407] Sending NMI from CPU 3 to CPUs 2:
[  204.802479] NMI backtrace for cpu 2
[  204.802479] CPU: 2 PID: 2672 Comm: chrome Tainted: G           O
4.12.0-1-amd64 #1 Debian 4.12.6-1
[  204.802479] Hardware name: Supermicro Super Server/X11SSZ-QF, BIOS
1.0a 11/09/2015
[  204.802479] task: ffff89ce053d8040 task.stack: ffff9a54c675c000
[  204.802480] RIP: 0010:bfq_update_active_tree+0xa9/0x110 [bfq]
[  204.802480] RSP: 0000:ffff9a54c675f988 EFLAGS: 00000046
[  204.802480] RAX: ffff89ce0c4e8098 RBX: ffff89ce0c4e8098 RCX: 0000000000000000
[  204.802480] RDX: ffff89ce0c4e8098 RSI: 000001a06ef8036b RDI: ffff89ce0c4e8098
[  204.802481] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[  204.802481] R10: ffff89ce08907e00 R11: ffff89ce03544400 R12: ffff89ce0c4e8098
[  204.802481] R13: ffff89ce0db41158 R14: 0000000000000000 R15: 0000000000000000
[  204.802481] FS:  00007f4e8271aac0(0000) GS:ffff89ce32c80000(0000)
knlGS:0000000000000000
[  204.802481] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  204.802482] CR2: 0000555f64c8a1a0 CR3: 00000007bd367000 CR4: 00000000003406e0
[  204.802482] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  204.802482] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  204.802482] Call Trace:
[  204.802482]  ? bfq_active_extract+0x69/0x140 [bfq]
[  204.802483]  ? __bfq_requeue_entity+0x2f/0x80 [bfq]
[  204.802483]  ? bfq_activate_requeue_entity+0xf5/0x200 [bfq]
[  204.802483]  ? bfq_activate_bfqq+0x24/0x30 [bfq]
[  204.802483]  ? bfq_add_bfqq_busy+0x2b/0xb0 [bfq]
[  204.802483]  ? bfq_insert_requests+0x7fb/0xf80 [bfq]
[  204.802484]  ? blk_mq_sched_insert_requests+0xbf/0x120
[  204.802484]  ? blk_mq_flush_plug_list+0x184/0x260
[  204.802484]  ? blk_flush_plug_list+0xf2/0x280
[  204.802484]  ? blk_finish_plug+0x27/0x40
[  204.802484]  ? __do_page_cache_readahead+0x210/0x2d0
[  204.802485]  ? find_get_entry+0x19/0xc0
[  204.802485]  ? filemap_fault+0x42d/0x620
[  204.802485]  ? filemap_fault+0x42d/0x620
[  204.802485]  ? alloc_set_pte+0x3c2/0x550
[  204.802485]  ? filemap_map_pages+0x182/0x330
[  204.802485]  ? ext4_filemap_fault+0x2c/0x40 [ext4]
[  204.802486]  ? __do_fault+0x19/0xb0
[  204.802486]  ? __handle_mm_fault+0xab9/0xf80
[  204.802486]  ? handle_mm_fault+0xee/0x210
[  204.802486]  ? __do_page_fault+0x2a4/0x510
[  204.802486]  ? page_fault+0x28/0x30
[  204.802486] Code: 76 40 48 29 f1 48 85 c9 7e 04 48 89 70 40 48 8b
48 10 48 85 c9 74 14 48 8b 71 40 48 8b 48 40 48 29 f1 48 85 c9 0f 8f
62 ff ff ff <48> 8b 42 10 e9 61 ff ff ff 48 8b 4a 08 48 85 c9 74 ab 48
8b 71
[  204.802492] Sending NMI from CPU 3 to CPUs 6:
[  204.803509] NMI backtrace for cpu 6
[  204.803510] CPU: 6 PID: 2712 Comm: chrome Tainted: G           O
4.12.0-1-amd64 #1 Debian 4.12.6-1
[  204.803510] Hardware name: Supermicro Super Server/X11SSZ-QF, BIOS
1.0a 11/09/2015
[  204.803510] task: ffff89ce02dc7040 task.stack: ffff9a54c6844000
[  204.803510] RIP: 0010:native_queued_spin_lock_slowpath+0x10f/0x190
[  204.803511] RSP: 0000:ffff9a54c6847a58 EFLAGS: 00000046
[  204.803511] RAX: 0000000000000000 RBX: ffff89ce0bf6ab00 RCX: ffff89ce32d9b9c0
[  204.803511] RDX: 0000000000000007 RSI: 0000000000200000 RDI: ffff89ce03544760
[  204.803511] RBP: ffff89ce03544760 R08: 00000000001c0000 R09: 0000000000000000
[  204.803511] R10: 0000000000000000 R11: 0000000000001000 R12: ffff89ce03544400
[  204.803512] R13: ffff89ce09320040 R14: ffff9a54c6847b78 R15: ffff9a54c6847b78
[  204.803512] FS:  00007f4e8271aac0(0000) GS:ffff89ce32d80000(0000)
knlGS:0000000000000000
[  204.803512] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  204.803512] CR2: 0000555f64c8a1a0 CR3: 00000007afb49000 CR4: 00000000003406e0
[  204.803513] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  204.803513] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  204.803513] Call Trace:
[  204.803513]  ? _raw_spin_lock_irq+0x24/0x30
[  204.803513]  ? bfq_insert_requests+0xb0/0xf80 [bfq]
[  204.803513]  ? blk_mq_sched_insert_requests+0xbf/0x120
[  204.803514]  ? blk_mq_flush_plug_list+0x184/0x260
[  204.803514]  ? blk_flush_plug_list+0xf2/0x280
[  204.803514]  ? blk_finish_plug+0x27/0x40
[  204.803514]  ? __do_page_cache_readahead+0x210/0x2d0
[  204.803514]  ? find_get_entry+0x19/0xc0
[  204.803515]  ? filemap_fault+0x42d/0x620
[  204.803515]  ? filemap_fault+0x42d/0x620
[  204.803515]  ? alloc_set_pte+0x4de/0x550
[  204.803515]  ? filemap_map_pages+0x182/0x330
[  204.803515]  ? ext4_filemap_fault+0x2c/0x40 [ext4]
[  204.803515]  ? __do_fault+0x19/0xb0
[  204.803516]  ? __handle_mm_fault+0xab9/0xf80
[  204.803516]  ? handle_mm_fault+0xee/0x210
[  204.803516]  ? __do_page_fault+0x2a4/0x510
[  204.803516]  ? page_fault+0x28/0x30
[  204.803516] Code: 41 c1 ea 12 83 e0 03 83 ea 01 48 c1 e0 04 48 63
d2 48 05 c0 b9 01 00 48 03 04 d5 e0 c3 e7 9b 48 89 08 8b 41 08 85 c0
75 09 f3 90 <8b> 41 08 85 c0 74 f7 4c 8b 09 4d 85 c9 74 08 41 0f 0d 09
eb 02
[  204.803522] Sending NMI from CPU 3 to CPUs 7:
[  204.804600] NMI backtrace for cpu 7
[  204.804600] CPU: 7 PID: 2614 Comm: chrome Tainted: G           O
4.12.0-1-amd64 #1 Debian 4.12.6-1
[  204.804600] Hardware name: Supermicro Super Server/X11SSZ-QF, BIOS
1.0a 11/09/2015
[  204.804601] task: ffff89ce071d70c0 task.stack: ffff9a54c673c000
[  204.804601] RIP: 0010:native_queued_spin_lock_slowpath+0x126/0x190
[  204.804601] RSP: 0000:ffff9a54c673fa58 EFLAGS: 00000002
[  204.804601] RAX: 0000000000000001 RBX: ffff89ce07342600 RCX: ffff89ce32ddb9c0
[  204.804601] RDX: 0000000000180001 RSI: 00000000000c0000 RDI: ffff89ce03544760
[  204.804602] RBP: ffff89ce03544760 R08: 0000000000200000 R09: ffff89ce32d9b9c0
[  204.804602] R10: ffff89ce0d213c50 R11: 0000000000001000 R12: ffff89ce03544400
[  204.804602] R13: ffff89ce09320040 R14: 0000000000000000 R15: ffff9a54c673fb78
[  204.804602] FS:  00007f4e8271aac0(0000) GS:ffff89ce32dc0000(0000)
knlGS:0000000000000000
[  204.804603] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  204.804603] CR2: 0000555f64c8a1a0 CR3: 00000007bcce2000 CR4: 00000000003406e0
[  204.804603] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  204.804603] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  204.804603] Call Trace:
[  204.804604]  ? _raw_spin_lock_irq+0x24/0x30
[  204.804604]  ? bfq_insert_requests+0xe0/0xf80 [bfq]
[  204.804604]  ? blk_mq_sched_insert_requests+0xbf/0x120
[  204.804604]  ? blk_mq_flush_plug_list+0x184/0x260
[  204.804604]  ? blk_flush_plug_list+0xf2/0x280
[  204.804604]  ? blk_finish_plug+0x27/0x40
[  204.804605]  ? __do_page_cache_readahead+0x210/0x2d0
[  204.804605]  ? find_get_entry+0x19/0xc0
[  204.804605]  ? filemap_fault+0x42d/0x620
[  204.804605]  ? filemap_fault+0x42d/0x620
[  204.804605]  ? filemap_map_pages+0x182/0x330
[  204.804606]  ? ext4_filemap_fault+0x2c/0x40 [ext4]
[  204.804606]  ? __do_fault+0x19/0xb0
[  204.804606]  ? __handle_mm_fault+0xab9/0xf80
[  204.804606]  ? handle_mm_fault+0xee/0x210
[  204.804606]  ? __do_page_fault+0x2a4/0x510
[  204.804606]  ? page_fault+0x28/0x30
[  204.804606] Code: 48 03 04 d5 e0 c3 e7 9b 48 89 08 8b 41 08 85 c0
75 09 f3 90 8b 41 08 85 c0 74 f7 4c 8b 09 4d 85 c9 74 08 41 0f 0d 09
eb 02 f3 90 <8b> 17 66 85 d2 75 f7 be 01 00 00 00 eb 10 89 d0 f0 0f b1
37 39
[  204.804613] rcu_sched kthread starved for 5248 jiffies! g3910 c3909
f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0
[  204.804635] rcu_sched       R  running task        0     8      2 0x00000000
[  204.804637] Call Trace:
[  204.804639]  ? __schedule+0x3c5/0x850
[  204.804640]  ? schedule+0x32/0x80
[  204.804642]  ? schedule_timeout+0x17c/0x310
[  204.804643]  ? rcu_report_qs_rnp+0xd7/0xf0
[  204.804645]  ? call_timer_fn+0x120/0x120
[  204.804647]  ? rcu_gp_kthread+0x51e/0x850
[  204.804649]  ? rcu_gp_kthread+0x51e/0x850
[  204.804651]  ? kthread+0xfc/0x130
[  204.804652]  ? rcu_note_context_switch+0x110/0x110
[  204.804654]  ? kthread_create_on_node+0x70/0x70
[  204.804655]  ? ret_from_fork+0x25/0x30

[  232.319383] NMI watchdog: BUG: soft lockup - CPU#3 stuck for 22s!
[chrome:2568]
[  232.319385] Modules linked in: arc4 md4 nls_utf8 cifs ccm
dns_resolver fscache fuse ufs qnx4 hfsplus hfs minix ntfs vfat msdos
fat jfs xfs netconsole xt_comment xfrm_user xfrm_algo xt_addrtype
xt_conntrack br_netfilter dm_thin_pool dm_persistent_data
dm_bio_prison dm_bufio loop pci_stub vboxpci(O) vboxnetadp(O)
vboxnetflt(O) vboxdrv(O) xt_CHECKSUM iptable_mangle ipt_MASQUERADE
nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4
nf_nat_ipv4 nf_nat nf_conntrack libcrc32c xt_tcpudp bridge stp llc
iptable_filter binfmt_misc snd_hda_codec_hdmi snd_hda_codec_realtek
snd_hda_codec_generic intel_rapl x86_pkg_temp_thermal intel_powerclamp
coretemp kvm_intel snd_hda_intel snd_virtuoso snd_oxygen_lib
snd_mpu401_uart kvm i915 snd_hda_codec ast snd_rawmidi irqbypass
snd_hda_core snd_seq_device
[  232.319402]  ttm snd_hwdep snd_pcm intel_cstate intel_uncore
snd_timer joydev drm_kms_helper snd iTCO_wdt intel_rapl_perf pcspkr
evdev soundcore iTCO_vendor_support shpchp sg mei_me drm mei
intel_pch_thermal hci_uart btbcm btqca btintel bluetooth battery
ipmi_si ipmi_devintf ipmi_msghandler ecdh_generic rfkill
intel_lpss_acpi intel_lpss video mfd_core button acpi_pad acpi_als
kfifo_buf industrialio tcp_bbr sch_fq nfsd auth_rpcgss nfs_acl lockd
grace sunrpc bfq ip_tables x_tables autofs4 ext4 crc16 jbd2 fscrypto
ecb mbcache btrfs crc32c_generic xor raid6_pq algif_skcipher af_alg
hid_logitech_hidpp hid_logitech_dj uas usb_storage hid_generic usbhid
dm_crypt dm_mod configfs sd_mod crct10dif_pclmul crc32_pclmul
crc32c_intel ghash_clmulni_intel pcbc aesni_intel aes_x86_64
crypto_simd glue_helper cryptd
[  232.319421]  igb e1000e ahci i2c_algo_bit i2c_i801 dca libahci
xhci_pci ptp pps_core libata xhci_hcd scsi_mod usbcore usb_common fan
thermal i2c_hid hid
[  232.319427] CPU: 3 PID: 2568 Comm: chrome Tainted: G           O
4.12.0-1-amd64 #1 Debian 4.12.6-1
[  232.319427] Hardware name: Supermicro Super Server/X11SSZ-QF, BIOS
1.0a 11/09/2015
[  232.319429] task: ffff89ce0368f080 task.stack: ffff9a54c66a4000
[  232.319431] RIP: 0010:smp_call_function_single+0xc9/0xf0
[  232.319432] RSP: 0000:ffff9a54c66a7cc8 EFLAGS: 00000202 ORIG_RAX:
ffffffffffffff10
[  232.319433] RAX: 0000000000000000 RBX: ffff89ce0273f000 RCX: 0000000000000000
[  232.319434] RDX: 0000000000000001 RSI: 00000000000000fb RDI: 0000000000000286
[  232.319435] RBP: 00007f7865d49000 R08: fffffffffffffff0 R09: 000000000000000a
[  232.319436] R10: 0000000000000000 R11: 0000000000000001 R12: ffff89ce0273f2e8
[  232.319437] R13: ffff89cd7d0877d0 R14: ffff89ce0273f000 R15: 00007f7865d49000
[  232.319438] FS:  00007f7876aa1ac0(0000) GS:ffff89ce32cc0000(0000)
knlGS:0000000000000000
[  232.319439] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  232.319440] CR2: 00007f7865d49038 CR3: 00000007bcc85000 CR4: 00000000003406e0
[  232.319441] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
232.319443] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  232.319443] Call Trace:
[  232.319445]  ? do_flush_tlb_all+0x40/0x40
[  232.319447]  ? native_flush_tlb_others+0x54/0x120
[  232.319449]  ? flush_tlb_page+0x55/0x90
[  232.319451]  ? ptep_clear_flush+0x48/0x60
[  232.319452]  ? wp_page_copy+0x278/0x630
[  232.319453]  ? do_wp_page+0x14a/0x4e0
[  232.319455]  ? __handle_mm_fault+0x6cd/0xf80
[  232.319456]  ? handle_mm_fault+0xee/0x210
[  232.319458]  ? __do_page_fault+0x2a4/0x510
[  232.319459]  ? page_fault+0x28/0x30
[  232.319461] Code: 24 20 65 48 33 0c 25 28 00 00 00 75 37 48 83 c4
28 c3 48 89 d1 48 89 f2 48 89 e6 e8 82 fe ff ff 8b 54 24 18 83 e2 01
74 0b f3 90 <8b> 54 24 18 83 e2 01 75 f5 eb c7 8b 05 4e 18 dd 00 85 c0
75 85
[  260.319411] NMI watchdog: BUG: soft lockup - CPU#3 stuck for 22s!
[chrome:2568]

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