Patch to nilfs2 by Ryusuke Konishi (https://www.spinics.net/lists/linux-
nilfs/msg04322.html) has found its way to Ubuntu kernel image linux-
image-5.3.0-64-lowlatency (5.3.0-64.58), and the kernel oops doesn't
appear any more. To me it seems this issue is finally resolved.
** Changed in: linux (Ubuntu)
Status: Expired => Fix Released
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https://bugs.launchpad.net/bugs/1859979
Title:
nilfs2 segctord kthread dies after which write to nilfs2 fs freezes
the process writing
Status in linux package in Ubuntu:
Fix Released
Bug description:
With linux-image-5.3.0-26-lowlatency, segctord kthread encounters a
"BUG: kernel NULL pointer dereference, address: 00000000000000a8" some
half a minute from boot. Before that, one can log in to the system
(/home is on a nilfs2 filesystem), but after the kernel BUG report,
any write to a nilfs2 filesystem freezes the process trying to write,
or any new login attempt freezes. This bug can be reproduced with
every boot.
With linux-image-5.3.0-24-lowlatency and earlier, this doesn't happen.
Relevant excerpt from syslog:
...
Jan 16 10:56:59 lillukka kernel: [ 0.000000] Linux version
5.3.0-26-lowlatency (buildd@lgw01-amd64-013) (gcc version 9.2.1 20191008
(Ubuntu 9.2.1-9ubuntu2)) #28-Ubuntu SMP
PREEMPT Wed Dec 18 06:21:38 UTC 2019 (Ubuntu 5.3.0-26.28-lowlatency 5.3.13)
...
Jan 16 10:57:13 lillukka kernel: [ 28.727753] BUG: kernel NULL pointer
dereference, address: 00000000000000a8
Jan 16 10:57:13 lillukka kernel: [ 28.727852] #PF: supervisor read access
in kernel mode
Jan 16 10:57:13 lillukka kernel: [ 28.727914] #PF: error_code(0x0000) -
not-present page
Jan 16 10:57:13 lillukka kernel: [ 28.727974] PGD 0 P4D 0
Jan 16 10:57:13 lillukka kernel: [ 28.728012] Oops: 0000 [#1] PREEMPT SMP
PTI
Jan 16 10:57:13 lillukka kernel: [ 28.728067] CPU: 3 PID: 838 Comm:
segctord Not tainted 5.3.0-26-lowlatency #28-Ubuntu
Jan 16 10:57:13 lillukka kernel: [ 28.728156] Hardware name: Sony
Corporation SVP1321C5E/VAIO, BIOS R0280V7 07/11/2013
Jan 16 10:57:13 lillukka kernel: [ 28.728257] RIP:
0010:percpu_counter_add_batch+0x13/0x80
Jan 16 10:57:13 lillukka kernel: [ 28.728334] Code: e0 41 5c 41 5d 41 5e 5d
c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 55 48 89 e5 41 55 41 54 49 89 fc
53 65 ff 05 b5 5c
ed 72 <48> 8b 47 20 48 63 ca 65 44 8b 28 49 63 dd 48 01 f3 48 39 d9 7e 0a
Jan 16 10:57:13 lillukka kernel: [ 28.728536] RSP: 0018:ffffb582c02afcb0
EFLAGS: 00010082
Jan 16 10:57:13 lillukka kernel: [ 28.728598] RAX: 0000000000000002 RBX:
0000000000000000 RCX: 0000000000000001
Jan 16 10:57:13 lillukka kernel: [ 28.728679] RDX: 0000000000000018 RSI:
0000000000000001 RDI: 0000000000000088
Jan 16 10:57:13 lillukka kernel: [ 28.728760] RBP: ffffb582c02afcc8 R08:
ffff8f519357ab40 R09: 0000000000000018
Jan 16 10:57:13 lillukka kernel: [ 28.728841] R10: 0000000000030140 R11:
ffff8f5193609eea R12: 0000000000000088
Jan 16 10:57:13 lillukka kernel: [ 28.728920] R13: ffff8f518a3ee498 R14:
ffff8f518a3ee608 R15: ffffe52b07e5a200
Jan 16 10:57:13 lillukka kernel: [ 28.729001] FS: 0000000000000000(0000)
GS:ffff8f5197980000(0000) knlGS:0000000000000000
Jan 16 10:57:13 lillukka kernel: [ 28.729091] CS: 0010 DS: 0000 ES: 0000
CR0: 0000000080050033
Jan 16 10:57:13 lillukka kernel: [ 28.729157] CR2: 00000000000000a8 CR3:
000000008d60a002 CR4: 00000000001606e0
Jan 16 10:57:13 lillukka kernel: [ 28.729237] Call Trace:
Jan 16 10:57:13 lillukka kernel: [ 28.729280]
__test_set_page_writeback+0x2f1/0x310
Jan 16 10:57:13 lillukka kernel: [ 28.729362]
nilfs_segctor_do_construct+0xd13/0x1260 [nilfs2]
Jan 16 10:57:13 lillukka kernel: [ 28.729432] ? __switch_to_asm+0x40/0x70
Jan 16 10:57:13 lillukka kernel: [ 28.729496]
nilfs_segctor_construct+0x1ff/0x2f0 [nilfs2]
Jan 16 10:57:13 lillukka kernel: [ 28.729572]
nilfs_segctor_thread+0x136/0x3a0 [nilfs2]
Jan 16 10:57:13 lillukka kernel: [ 28.729640] kthread+0x104/0x140
Jan 16 10:57:13 lillukka kernel: [ 28.729690] ?
nilfs_segctor_construct+0x2f0/0x2f0 [nilfs2]
Jan 16 10:57:13 lillukka kernel: [ 28.729760] ? kthread_park+0x80/0x80
Jan 16 10:57:13 lillukka kernel: [ 28.729807] ret_from_fork+0x35/0x40
Jan 16 10:57:13 lillukka kernel: [ 28.729854] Modules linked in: ccm rfcomm
aufs overlay cmac bnep nilfs2 snd_hda_codec_realtek snd_hda_codec_generic
ledtrig_audio snd_hda_codec_hdmi snd_hda_intel pn544_mei mei_phy pn544
snd_hda_codec hci snd_hda_core snd_hwdep intel_rapl_msr mei_hdcp nfc snd_pcm
snd_seq_midi snd_seq_midi_event intel_rapl_common x86_pkg_temp_thermal
intel_powerclamp snd_rawmidi coretemp iwlmvm mac80211 snd_seq btusb btrtl
libarc4 btbcm uvcvideo btintel kvm videobuf2_vmalloc iwlwifi videobuf2_memops
bluetooth snd_seq_device videobuf2_v4l2 videobuf2_common irqbypass joydev
input_leds intel_cstate videodev ecdh_generic snd_timer intel_rapl_perf ecc
serio_raw mc mei_me cfg80211 mei snd soundcore sony_laptop mac_hid
intel_smartconnect sch_fq_codel cuse parport_pc ppdev lp parport ip_tables
x_tables autofs4 btrfs xor zstd_compress raid6_pq libcrc32c dm_crypt dm_mirror
dm_region_hash dm_log crct10dif_pclmul i915 crc32_pclmul ghash_clmulni_intel
i2c_algo_bit drm_kms_helper syscopyarea aesni_intel sysfillrect
Jan 16 10:57:13 lillukka kernel: [ 28.729928] sysimgblt aes_x86_64
crypto_simd cryptd glue_helper psmouse ahci fb_sys_fops libahci i2c_i801 drm
lpc_ich video
Jan 16 10:57:13 lillukka kernel: [ 28.730961] CR2: 00000000000000a8
Jan 16 10:57:13 lillukka kernel: [ 28.731005] ---[ end trace
c5ef8752d8fe754e ]---
Jan 16 10:57:13 lillukka kernel: [ 28.731064] RIP:
0010:percpu_counter_add_batch+0x13/0x80
Jan 16 10:57:13 lillukka kernel: [ 28.731128] Code: e0 41 5c 41 5d 41 5e 5d
c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 55 48 89 e5 41 55 41 54 49 89 fc
53 65 ff 05 b5 5c ed 72 <48> 8b 47 20 48 63 ca 65 44 8b 28 49 63 dd 48 01 f3 48
39 d9 7e 0a
Jan 16 10:57:13 lillukka kernel: [ 28.731326] RSP: 0018:ffffb582c02afcb0
EFLAGS: 00010082
Jan 16 10:57:13 lillukka kernel: [ 28.731388] RAX: 0000000000000002 RBX:
0000000000000000 RCX: 0000000000000001
Jan 16 10:57:13 lillukka kernel: [ 28.731468] RDX: 0000000000000018 RSI:
0000000000000001 RDI: 0000000000000088
Jan 16 10:57:13 lillukka kernel: [ 28.731549] RBP: ffffb582c02afcc8 R08:
ffff8f519357ab40 R09: 0000000000000018
Jan 16 10:57:13 lillukka kernel: [ 28.731629] R10: 0000000000030140 R11:
ffff8f5193609eea R12: 0000000000000088
Jan 16 10:57:13 lillukka kernel: [ 28.731709] R13: ffff8f518a3ee498 R14:
ffff8f518a3ee608 R15: ffffe52b07e5a200
Jan 16 10:57:13 lillukka kernel: [ 28.731790] FS: 0000000000000000(0000)
GS:ffff8f5197980000(0000) knlGS:0000000000000000
Jan 16 10:57:13 lillukka kernel: [ 28.731881] CS: 0010 DS: 0000 ES: 0000
CR0: 0000000080050033
Jan 16 10:57:13 lillukka kernel: [ 28.731947] CR2: 00000000000000a8 CR3:
000000008d60a002 CR4: 00000000001606e0
Jan 16 10:57:13 lillukka kernel: [ 28.732084] note: segctord[838] exited
with preempt_count 2
Jan 16 10:57:11 lillukka systemd-resolved[928]: Server returned error
NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying
transaction with reduced feature level UDP.
Jan 16 10:57:19 lillukka systemd-resolved[928]: Using degraded feature set
(UDP) for DNS server 192.168.1.1.
Jan 16 10:57:22 lillukka systemd[1]: NetworkManager-dispatcher.service:
Succeeded.
Jan 16 10:57:29 lillukka systemd-timesyncd[929]: Synchronized to time server
for the first time 91.189.91.157:123 (ntp.ubuntu.com).
Jan 16 10:57:30 lillukka systemd[1]: systemd-hostnamed.service: Succeeded.
Jan 16 11:01:16 lillukka wpa_supplicant[976]: wlp1s0: WPA: Group rekeying
completed with 00:22:07:18:db:7e [GTK=TKIP]
...
ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: linux-image-5.3.0-26-lowlatency 5.3.0-26.28
ProcVersionSignature: Ubuntu 5.3.0-24.26-lowlatency 5.3.10
Uname: Linux 5.3.0-24-lowlatency x86_64
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: jnykopp 4979 F.... pulseaudio
/dev/snd/controlC0: jnykopp 4979 F.... pulseaudio
CurrentDesktop: XFCE
Date: Thu Jan 16 14:24:09 2020
MachineType: Sony Corporation SVP1321C5E
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.3.0-24-lowlatency
root=/dev/mapper/hostname-root ro quiet splash
RelatedPackageVersions:
linux-restricted-modules-5.3.0-24-lowlatency N/A
linux-backports-modules-5.3.0-24-lowlatency N/A
linux-firmware 1.183.3
SourcePackage: linux
UpgradeStatus: Upgraded to eoan on 2019-12-01 (45 days ago)
dmi.bios.date: 07/11/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: R0280V7
dmi.board.asset.tag: N/A
dmi.board.name: VAIO
dmi.board.vendor: Sony Corporation
dmi.board.version: N/A
dmi.chassis.asset.tag: N/A
dmi.chassis.type: 10
dmi.chassis.vendor: Sony Corporation
dmi.chassis.version: N/A
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvrR0280V7:bd07/11/2013:svnSonyCorporation:pnSVP1321C5E:pvrC60C391V:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
dmi.product.family: VAIO
dmi.product.name: SVP1321C5E
dmi.product.sku: 54641591
dmi.product.version: C60C391V
dmi.sys.vendor: Sony Corporation
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