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From:   Ryusuke Konishi <konishi.ryusuke@gmail.com>
Date:   Tue, 19 Nov 2019 01:51:42 +0900
Message-ID: <CAKFNMo=k1wVHOwXhTLEOJ+A-nwmvJ+sN_PPa8kY8fMxrQ4R+Jw@mail.gmail.com>
Subject: Re: BUG: unable to handle kernel NULL pointer dereference at
 00000000000000a8 in nilfs_segctor_do_construct
To:     Tomas Hlavaty <tom@logand.com>
Cc:     linux-nilfs <linux-nilfs@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>
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Hi,

> It was likely caused by improper shutdown and following nilfs2 partition
> corruption.  Now I can still read the data, but on the whole the
> computer is not useable, because starting a process which uses the
> corrupted file system simply crashes in kernel.

Thank you for reporting the issue.
Let me ask you a few questions:

1) Is the crash reproducible in the environment ?
2) Can you mount the corrupted(?) partition from a recent version of kernel=
 ?
3) Does read-only mount option (-r) work to avoid the crash ?

Thanks,
Ryusuke Konishi

2019=E5=B9=B411=E6=9C=8818=E6=97=A5(=E6=9C=88) 2:34 Tomas Hlavaty <tom@loga=
nd.com>:
>
> Hi Ryusuke,
>
> today I got this bug in kernel, which seems to be related to nilfs2.
>
> It was likely caused by improper shutdown and following nilfs2 partition
> corruption.  Now I can still read the data, but on the whole the
> computer is not useable, because starting a process which uses the
> corrupted file system simply crashes in kernel.  I am actually not sure
> if the filesystem is corrupted, as I don't know about any tool to check
> that.  The relevant parts of dmesg log are bellow.
>
> Please let me know if you are the right contact or if you need more info
> about the problem.
>
> Thank you,
>
> Tomas
>
> [    0.000000] Linux version 4.19.84 (nixbld@localhost) (gcc version 8.3.=
0 (GCC)) #1-NixOS SMP Tue Nov 12 18:21:46 UTC 2019
> [    0.000000] Command line: initrd=3D\efi\nixos\4s51zw36kd1qb0ymk0charxj=
g8x6k5k3-initrd-linux-4.19.84-initrd.efi systemConfig=3D/nix/store/gdbxhzys=
r929abrymjqala0b5bh2fqmv-nixos-system-ushi-19.09.1258.07e66484e67 init=3D/n=
ix/store/gdbxhzysr929abrymjqala0b5bh2fqmv-nixos-system-ushi-19.09.1258.07e6=
6484e67/init loglevel=3D4
>
>
>
> [   37.741106] systemd-journald[470]: Received client request to flush ru=
ntime journal.
> [   37.749084] systemd-journald[470]: File /var/log/journal/55a4ea9159c14=
c0bb8767a43819c6927/system.journal corrupted or uncleanly shut down, renami=
ng and replacing.
> [   37.810819] audit: type=3D1130 audit(1573985039.617:3): pid=3D1 uid=3D=
0 auid=3D4294967295 ses=3D4294967295 subj=3D=3Dunconfined msg=3D'unit=3Dsys=
temd-udevd comm=3D"systemd" exe=3D"/nix/store/v8flm2h07zcfg5k5npz56m0ayj0qm=
1q8-systemd-243/lib/systemd/systemd" hostname=3D? addr=3D? terminal=3D? res=
=3Dsuccess'
>
> [   38.321561] NILFS version 2 loaded
> [   38.323236] NILFS (dm-1): mounting unchecked fs
>
>
> [   38.349185] NILFS (dm-1): recovery complete
> [   38.353228] NILFS (dm-1): segctord starting. Construction interval =3D=
 5 seconds, CP frequency < 30 seconds
>
> [   63.543941] systemd-journald[470]: File
> /var/log/journal/55a4ea9159c14c0bb8767a43819c6927/user-1000.journal
> corrupted or uncleanly shut down, renaming and replacing.
>
> [12637.085548] BUG: unable to handle kernel NULL pointer dereference at 0=
0000000000000a8
> [12637.085558] PGD 0 P4D 0
> [12637.085567] Oops: 0000 [#1] SMP PTI
> [12637.085574] CPU: 0 PID: 657 Comm: segctord Not tainted 4.19.84 #1-NixO=
S
> [12637.085577] Hardware name: ASUSTeK COMPUTER INC. VivoBook 15_ASUS Lapt=
op X507MA_R507MA/X507MA, BIOS X507MA.301 09/14/2018
> [12637.085589] RIP: 0010:percpu_counter_add_batch+0x4/0x60
> [12637.085593] Code: 89 e6 89 c7 e8 dd 3b 28 00 3b 05 fb e0 b6 00 72 d8 4=
c 89 ee 48 89 ef e8 7a 63 2a 00 48 89 d8 5b 5d 41 5c 41 5d c3 41 54 55 53 <=
48> 8b 47 20 65 44 8b 20 49 63 ec 48 63 ca 48 01 f5 48 39 e9 7e 0a
> [12637.085597] RSP: 0018:ffff9d1b00a0bd20 EFLAGS: 00010006
> [12637.085601] RAX: 0000000000000002 RBX: 0000000000000000 RCX: 000000000=
0000018
> [12637.085604] RDX: 0000000000000018 RSI: 0000000000000001 RDI: 000000000=
0000088
> [12637.085608] RBP: ffff8df67a2988d0 R08: 0000000000000000 R09: ffff8df66=
fe0cfe0
> [12637.085611] R10: 0000000000000230 R11: 0000000000000000 R12: 000000000=
0000000
> [12637.085614] R13: ffff8df67a298758 R14: ffff8df67a2988c8 R15: ffffccd68=
4229a80
> [12637.085618] FS:  0000000000000000(0000) GS:ffff8df67ba00000(0000) knlG=
S:0000000000000000
> [12637.085621] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [12637.085624] CR2: 00000000000000a8 CR3: 000000011ac0a000 CR4: 000000000=
0340ef0
> [12637.085628] Call Trace:
> [12637.085640]  __test_set_page_writeback+0x37c/0x3f0
> [12637.085663]  nilfs_segctor_do_construct+0x184e/0x2040 [nilfs2]
> [12637.085680]  nilfs_segctor_construct+0x1f5/0x2e0 [nilfs2]
> [12637.085693]  nilfs_segctor_thread+0x129/0x370 [nilfs2]
> [12637.085706]  ? nilfs_segctor_construct+0x2e0/0x2e0 [nilfs2]
> [12637.085713]  kthread+0x112/0x130
> [12637.085719]  ? kthread_bind+0x30/0x30
> [12637.085728]  ret_from_fork+0x1f/0x40
> [12637.085734] Modules linked in: ctr ccm af_packet msr 8021q snd_hda_cod=
ec_hdmi snd_hda_codec_realtek snd_hda_codec_generic hid_multitouch arc4 ath=
9k ath9k_common ath9k_hw ath mac80211 snd_soc_skl snd_soc_skl_ipc spi_pxa2x=
x_platform asus_nb_wmi snd_soc_sst_ipc snd_soc_sst_dsp asus_wmi 8250_dw i2c=
_designware_platform sparse_keymap i2c_designware_core wmi_bmof i915 snd_hd=
a_ext_core nilfs2 snd_soc_acpi_intel_match snd_soc_acpi uvcvideo videobuf2_=
vmalloc nls_iso8859_1 videobuf2_memops videobuf2_v4l2 snd_soc_core nls_cp43=
7 rtsx_usb_ms intel_telemetry_pltdrv vfat intel_punit_ipc intel_telemetry_c=
ore fat intel_pmc_ipc memstick videobuf2_common snd_compress kvmgt vfio_mde=
v mdev ath3k vfio_iommu_type1 vfio btusb ac97_bus snd_pcm_dmaengine btrtl x=
86_pkg_temp_thermal intel_powerclamp btbcm cec coretemp btintel
> [12637.085819]  crct10dif_pclmul crc32_pclmul videodev snd_hda_intel blue=
tooth drm_kms_helper ghash_clmulni_intel deflate media efi_pstore intel_cst=
ate pstore intel_rapl_perf cfg80211 snd_hda_codec joydev mousedev evdev wda=
t_wdt serio_raw mac_hid efivars drm snd_hda_core snd_hwdep ecdh_generic snd=
_pcm snd_timer mei_me idma64 virt_dma snd intel_gtt agpgart i2c_i801 i2c_al=
go_bit mei fb_sys_fops syscopyarea soundcore rfkill processor_thermal_devic=
e sysfillrect sysimgblt intel_lpss_pci intel_soc_dts_iosf thermal wmi intel=
_lpss i2c_hid i2c_core battery tpm_crb button ac tpm_tis tpm_tis_core asus_=
wireless video pcc_cpufreq tpm rng_core pinctrl_geminilake int3400_thermal =
int3403_thermal pinctrl_intel int340x_thermal_zone acpi_thermal_rel iptable=
_nat nf_nat_ipv4 nf_nat xt_conntrack nf_conntrack nf_defrag_ipv6
> [12637.085912]  nf_defrag_ipv4 libcrc32c ip6t_rpfilter ipt_rpfilter ip6ta=
ble_raw iptable_raw xt_pkttype nf_log_ipv6 nf_log_ipv4 nf_log_common xt_LOG=
 xt_tcpudp ip6table_filter ip6_tables iptable_filter sch_fq_codel loop cpuf=
req_powersave tun tap macvlan bridge stp llc kvm_intel kvm irqbypass efivar=
fs ip_tables x_tables ipv6 crc_ccitt autofs4 ext4 crc32c_generic crc16 mbca=
che jbd2 fscrypto dm_crypt algif_skcipher af_alg rtsx_usb_sdmmc mmc_core rt=
sx_usb hid_generic usbhid hid sd_mod input_leds led_class atkbd libps2 ahci=
 libahci xhci_pci libata xhci_hcd aesni_intel usbcore aes_x86_64 crypto_sim=
d scsi_mod cryptd glue_helper crc32c_intel usb_common rtc_cmos i8042 serio =
dm_mod
> [12637.086000] CR2: 00000000000000a8
> [12637.086005] ---[ end trace ee0079180c990cd2 ]---
> [12637.120805] RIP: 0010:percpu_counter_add_batch+0x4/0x60
> [12637.120807] Code: 89 e6 89 c7 e8 dd 3b 28 00 3b 05 fb e0 b6 00 72 d8 4=
c 89 ee 48 89 ef e8 7a 63 2a 00 48 89 d8 5b 5d 41 5c 41 5d c3 41 54 55 53 <=
48> 8b 47 20 65 44 8b 20 49 63 ec 48 63 ca 48 01 f5 48 39 e9 7e 0a
> [12637.120809] RSP: 0018:ffff9d1b00a0bd20 EFLAGS: 00010006
> [12637.120811] RAX: 0000000000000002 RBX: 0000000000000000 RCX: 000000000=
0000018
> [12637.120812] RDX: 0000000000000018 RSI: 0000000000000001 RDI: 000000000=
0000088
> [12637.120814] RBP: ffff8df67a2988d0 R08: 0000000000000000 R09: ffff8df66=
fe0cfe0
> [12637.120815] R10: 0000000000000230 R11: 0000000000000000 R12: 000000000=
0000000
> [12637.120816] R13: ffff8df67a298758 R14: ffff8df67a2988c8 R15: ffffccd68=
4229a80
> [12637.120818] FS:  0000000000000000(0000) GS:ffff8df67ba00000(0000) knlG=
S:0000000000000000
> [12637.120820] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [12637.120821] CR2: 00000000000000a8 CR3: 0000000138e0a000 CR4: 000000000=
0340ef0