Can the priority be upped? We have data sitting on the drive and afraid to
modify it for fear of data loss. We've seen crashes from reads as well, but
haven't identified the source, so we just leave it alone until it gets
fixed.

On Sat, May 16, 2020 at 4:00 PM Launchpad Bug Tracker <
1868...@bugs.launchpad.net> wrote:

> Status changed to 'Confirmed' because the bug affects multiple users.
>
> ** Changed in: nilfs2 (Ubuntu)
>        Status: New => Confirmed
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1868325
>
> Title:
>   NILFS2 kernal crashes from normal use
>
> Status in nilfs2 package in Ubuntu:
>   Confirmed
>
> Bug description:
>   we've been having this crash and finally isolated it repeatedly to
> NILFS2.
>   details below:
>
>   nilfs-tools is already the newest version (2.2.6-1).
>   Linux a11 4.15.0-91-generic #92-Ubuntu SMP Fri Feb 28 11:09:48 UTC 2020
> x86_64 x86_64 x86_64 GNU/Linux
>   Ubuntu 16.04.5 LTS
>
>
>   Mar 20 14:00:07 a11 kernel: [31601.660406] BUG: unable to handle kernel
> NULL pointer dereference at 00000000000000a8
>   Mar 20 14:00:07 a11 kernel: [31601.660594] IP:
> percpu_counter_add_batch+0x9/0x60
>   Mar 20 14:00:07 a11 kernel: [31601.660754] PGD 0 P4D 0
>   Mar 20 14:00:07 a11 kernel: [31601.660990] Oops: 0000 [#1] SMP PTI
>   Mar 20 14:00:07 a11 kernel: [31601.661424] Modules linked in: ufs qnx4
> hfsplus hfs minix ntfs msdos jfs xfs nilfs2 dm_crypt algif_skcipher af_alg
> nfsv3 rpcsec_gss_krb5 nfsv4 nfs fscache nf_conntrack_netlink nfnetlink
> xfrm_user xfrm_algo xt_addrtype br_netfilter xt_CHECKSUM iptable_mangle
> ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat
> nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT
> nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter ebtables devlink
> ip6table_filter ip6_tables iptable_filter aufs overlay nls_iso8859_1
> intel_rapl btusb btrtl btbcm btintel bluetooth x86_pkg_temp_thermal
> intel_powerclamp coretemp snd_hda_codec_hdmi kvm_intel kvm joydev
> input_leds ecdh_generic snd_hda_codec_realtek snd_hda_codec_generic
> snd_hda_intel snd_hda_codec irqbypass snd_hda_core crct10dif_pclmul
>   Mar 20 14:00:07 a11 kernel: [31601.665012]  snd_hwdep crc32_pclmul
> snd_pcm ghash_clmulni_intel mei_me intel_cstate eeepc_wmi mei asus_wmi
> wmi_bmof intel_rapl_perf snd_timer sparse_keymap snd soundcore shpchp
> lpc_ich mac_hid sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp
> libiscsi_tcp libiscsi scsi_transport_iscsi nfsd auth_rpcgss nfs_acl lockd
> grace sunrpc ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid0
> multipath linear ses enclosure raid1 raid456 async_raid6_recov async_memcpy
> async_pq async_xor async_tx xor nouveau raid6_pq libcrc32c video
> i2c_algo_bit ttm drm_kms_helper e1000e syscopyarea hid_generic aesni_intel
> sysfillrect ptp sysimgblt aes_x86_64 mxm_wmi crypto_simd fb_sys_fops usbhid
> ahci cryptd aacraid(OE) libahci drm scsi_transport_sas pps_core glue_helper
> hid wmi
>   Mar 20 14:00:07 a11 kernel: [31601.669388] CPU: 7 PID: 7228 Comm:
> segctord Tainted: G           OE    4.15.0-91-generic #92-Ubuntu
>   Mar 20 14:00:07 a11 kernel: [31601.670062] Hardware name: System
> manufacturer System Product Name/P9X79 PRO, BIOS 4701 05/07/2014
>   Mar 20 14:00:07 a11 kernel: [31601.670742] RIP:
> 0010:percpu_counter_add_batch+0x9/0x60
>   Mar 20 14:00:07 a11 kernel: [31601.671401] RSP: 0018:ffffb979c3fdfcf8
> EFLAGS: 00010006
>   Mar 20 14:00:07 a11 kernel: [31601.672080] RAX: 0000000000000003 RBX:
> ffffe72f467cfa40 RCX: 000000000000001b
>   Mar 20 14:00:07 a11 kernel: [31601.672763] RDX: 0000000000000020 RSI:
> 0000000000000001 RDI: 0000000000000088
>   Mar 20 14:00:07 a11 kernel: [31601.673447] RBP: ffffb979c3fdfd10 R08:
> 0000000000000000 R09: ffff8eeaa9fdeb40
>   Mar 20 14:00:07 a11 kernel: [31601.674144] R10: 0000000000000230 R11:
> ffff8eeaa9b52d80 R12: 0000000000000000
>   Mar 20 14:00:07 a11 kernel: [31601.674832] R13: 0000000000000000 R14:
> ffff8eeab9288f50 R15: ffff8eeab9288dd8
>   Mar 20 14:00:07 a11 kernel: [31601.675510] FS:  0000000000000000(0000)
> GS:ffff8eeaffdc0000(0000) knlGS:0000000000000000
>   Mar 20 14:00:07 a11 kernel: [31601.676190] CS:  0010 DS: 0000 ES: 0000
> CR0: 0000000080050033
>   Mar 20 14:00:07 a11 kernel: [31601.676874] CR2: 00000000000000a8 CR3:
> 000000007880a006 CR4: 00000000000606e0
>   Mar 20 14:00:07 a11 kernel: [31601.677567] Call Trace:
>   Mar 20 14:00:07 a11 kernel: [31601.678263]
> __test_set_page_writeback+0x31f/0x330
>   Mar 20 14:00:07 a11 kernel: [31601.678955]
> nilfs_segctor_do_construct+0x8ae/0x1300 [nilfs2]
>   Mar 20 14:00:07 a11 kernel: [31601.679639]  ?
> nilfs_test_metadata_dirty.isra.39+0x5b/0xb0 [nilfs2]
>   Mar 20 14:00:07 a11 kernel: [31601.680327]
> nilfs_segctor_construct+0x14b/0x2e0 [nilfs2]
>   Mar 20 14:00:07 a11 kernel: [31601.681022]  ?
> nilfs_segctor_construct+0x14b/0x2e0 [nilfs2]
>   Mar 20 14:00:07 a11 kernel: [31601.681721]
> nilfs_segctor_thread+0x106/0x390 [nilfs2]
>   Mar 20 14:00:07 a11 kernel: [31601.682421]  kthread+0x121/0x140
>   Mar 20 14:00:07 a11 kernel: [31601.683120]  ?
> nilfs_segctor_construct+0x2e0/0x2e0 [nilfs2]
>   Mar 20 14:00:07 a11 kernel: [31601.683816]  ?
> kthread_create_worker_on_cpu+0x70/0x70
>   Mar 20 14:00:07 a11 kernel: [31601.684520]  ret_from_fork+0x35/0x40
>   Mar 20 14:00:07 a11 kernel: [31601.685218] Code: 18 01 72 d7 4c 89 f6 4c
> 89 e7 e8 23 cf 4e 00 48 89 d8 5b 41 5c 41 5d 41 5e 5d c3 0f 1f 80 00 00 00
> 00 55 48 89 e5 41 55 41 54 53 <48> 8b 47 20 65 8b 18 48 63 db 48 63 ca 48
> 01 f3 48 39 d9 7e 0a
>   Mar 20 14:00:07 a11 kernel: [31601.686721] RIP:
> percpu_counter_add_batch+0x9/0x60 RSP: ffffb979c3fdfcf8
>   Mar 20 14:00:07 a11 kernel: [31601.687463] CR2: 00000000000000a8
>   Mar 20 14:00:07 a11 kernel: [31601.688195] ---[ end trace
> 02138a77d14f06fa ]---
>
>
>   Mar 20 14:21:13 a11 kernel: [  484.492137] BUG: unable to handle kernel
> NULL pointer dereference at 00000000000000a8
>   Mar 20 14:21:13 a11 kernel: [  484.492165] IP:
> percpu_counter_add_batch+0x9/0x60
>   Mar 20 14:21:13 a11 kernel: [  484.492171] PGD 0 P4D 0
>   Mar 20 14:21:13 a11 kernel: [  484.492178] Oops: 0000 [#1] SMP PTI
>   Mar 20 14:21:13 a11 kernel: [  484.492184] Modules linked in: nilfs2
> dm_crypt algif_skcipher af_alg nfsv3 rpcsec_gss_krb5 nfsv4 nfs fscache
> nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo xt_addrtype br_netfilter
> xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4
> iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4
> xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp
> llc ebtable_filter ebtables ip6table_filter devlink ip6_tables
> iptable_filter aufs overlay nls_iso8859_1 intel_rapl x86_pkg_temp_thermal
> intel_powerclamp coretemp kvm_intel kvm btusb btrtl btbcm irqbypass btintel
> crct10dif_pclmul bluetooth crc32_pclmul ecdh_generic input_leds
> ghash_clmulni_intel snd_hda_codec_hdmi joydev eeepc_wmi asus_wmi
> sparse_keymap wmi_bmof intel_cstate snd_hda_codec_realtek intel_rapl_perf
> snd_hda_codec_generic
>   Mar 20 14:21:13 a11 kernel: [  484.493697]  snd_hda_intel snd_hda_codec
> snd_hda_core snd_hwdep snd_pcm mei_me mei lpc_ich shpchp snd_timer snd
> soundcore mac_hid sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core nfsd
> auth_rpcgss nfs_acl lockd grace sunrpc iscsi_tcp libiscsi_tcp libiscsi
> scsi_transport_iscsi ip_tables x_tables autofs4 btrfs zstd_compress raid10
> raid0 multipath linear raid1 raid456 async_raid6_recov async_memcpy
> async_pq async_xor async_tx xor raid6_pq libcrc32c ses enclosure nouveau
> video i2c_algo_bit ttm drm_kms_helper hid_generic aesni_intel syscopyarea
> sysfillrect sysimgblt e1000e aes_x86_64 fb_sys_fops crypto_simd usbhid
> mxm_wmi ptp aacraid(OE) ahci cryptd glue_helper drm hid libahci pps_core
> scsi_transport_sas wmi
>   Mar 20 14:21:13 a11 kernel: [  484.497041] CPU: 6 PID: 4649 Comm:
> segctord Tainted: G           OE    4.15.0-91-generic #92-Ubuntu
>   Mar 20 14:21:13 a11 kernel: [  484.497672] Hardware name: System
> manufacturer System Product Name/P9X79 PRO, BIOS 4701 05/07/2014
>   Mar 20 14:21:13 a11 kernel: [  484.498306] RIP:
> 0010:percpu_counter_add_batch+0x9/0x60
>   Mar 20 14:21:13 a11 kernel: [  484.498954] RSP: 0018:ffffb7d4c14e3cf8
> EFLAGS: 00010006
>   Mar 20 14:21:13 a11 kernel: [  484.499615] RAX: 0000000000000003 RBX:
> fffffba347f85300 RCX: 000000000000001b
>   Mar 20 14:21:13 a11 kernel: [  484.500285] RDX: 0000000000000020 RSI:
> 0000000000000001 RDI: 0000000000000088
>   Mar 20 14:21:13 a11 kernel: [  484.500963] RBP: ffffb7d4c14e3d10 R08:
> 0000000000000000 R09: ffff968028dc46c0
>   Mar 20 14:21:13 a11 kernel: [  484.501637] R10: 0000000000000230 R11:
> ffff96802c27c470 R12: 0000000000000000
>   Mar 20 14:21:13 a11 kernel: [  484.502324] R13: 000*0000000000000 R14:
> ffff968028d0d390 R15: ffff968028d0d218
>   Mar 20 14:21:13 a11 kernel: [  484.503000] FS:  0000000000000000(0000)
> GS:ffff96803fd80000(0000) knlGS:0000000000000000
>   Mar 20 14:21:13 a11 kernel: [  484.503689] CS:  0010 DS: 0000 ES: 0000
> CR0: 0000000080050033
>   Mar 20 14:21:13 a11 kernel: [  484.504380] CR2: 00000000000000a8 CR3:
> 000000022ea0a001 CR4: 00000000000606e0
>   Mar 20 14:21:13 a11 kernel: [  484.505076] Call Trace:
>   Mar 20 14:21:13 a11 kernel: [  484.505763]
> __test_set_page_writeback+0x31f/0x330
>   Mar 20 14:21:13 a11 kernel: [  484.506458]
> nilfs_segctor_do_construct+0x8ae/0x1300 [nilfs2]
>   Mar 20 14:21:13 a11 kernel: [  484.507147]  ?
> nilfs_test_metadata_dirty.isra.39+0x5b/0xb0 [nilfs2]
>   Mar 20 14:21:13 a11 kernel: [  484.507835]
> nilfs_segctor_construct+0x14b/0x2e0 [nilfs2]
>   Mar 20 14:21:13 a11 kernel: [  484.508526]  ?
> nilfs_segctor_construct+0x14b/0x2e0 [nilfs2]
>   Mar 20 14:21:13 a11 kernel: [  484.509228]
> nilfs_segctor_thread+0x106/0x390 [nilfs2]
>   Mar 20 14:21:13 a11 kernel: [  484.509923]  kthread+0x121/0x140
>   Mar 20 14:21:13 a11 kernel: [  484.510621]  ?
> nilfs_segctor_construct+0x2e0/0x2e0 [nilfs2]
>   Mar 20 14:21:13 a11 kernel: [  484.511312]  ?
> kthread_create_worker_on_cpu+0x70/0x70
>   Mar 20 14:21:13 a11 kernel: [  484.512016]  ret_from_fork+0x35/0x40
>   Mar 20 14:21:13 a11 kernel: [  484.512708] Code: 18 01 72 d7 4c 89 f6 4c
> 89 e7 e8 23 cf 4e 00 48 89 d8 5b 41 5c 41 5d 41 5e 5d c3 0f 1f 80 00 00 00
> 00 55 48 89 e5 41 55 41 54 53 <48> 8b 47 20 65 8b 18 48 63 db 48 63 ca 48
> 01 f3 48 39 d9 7e 0a
>   Mar 20 14:21:13 a11 kernel: [  484.514163] RIP:
> percpu_counter_add_batch+0x9/0x60 RSP: ffffb7d4c14e3cf8
>   Mar 20 14:21:13 a11 kernel: [  484.514893] CR2: 00000000000000a8
>   Mar 20 14:21:13 a11 kernel: [  484.515608] ---[ end trace
> fd9a17603c6fa3c9 ]---
>
> To manage notifications about this bug go to:
>
> https://bugs.launchpad.net/ubuntu/+source/nilfs2/+bug/1868325/+subscriptions
>

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https://bugs.launchpad.net/bugs/1868325

Title:
  NILFS2 kernal crashes from normal use

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