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Unable to handle kernel paging request on avl_walk #6220

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tuomari opened this issue Jun 12, 2017 · 3 comments
Closed

Unable to handle kernel paging request on avl_walk #6220

tuomari opened this issue Jun 12, 2017 · 3 comments

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@tuomari
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tuomari commented Jun 12, 2017

System information

Type Version/Name
Distribution Name Debian
Distribution Version 8.7 (Jessie)
Linux Kernel 4.9.20
Architecture amd64
ZFS Version 7.0-RC3 84c07ad +ntrim2
SPL Version 7.0-RC3 bf8abea

Describe the problem you're observing

I was hitting some strange stacktraces and zfs problems with my system and payload (see #4895, #5071, #5226, #5429 and #5910). The system was up for maximum of two days before crashing. After upgrading to these versions the system was stable for almost two months, after which I got the following stacktrace:

Jun 10 16:11:07 helvi kernel: [5767162.001696] BUG: unable to handle kernel paging request at 000000009b9da09d
Jun 10 16:11:07 helvi kernel: [5767162.001781] IP: [<ffffffffa00e202e>] avl_walk+0x2e/0x60 [zavl]
Jun 10 16:11:07 helvi kernel: [5767162.001865] PGD 0 
Jun 10 16:11:07 helvi kernel: [5767162.001878] 
Jun 10 16:11:07 helvi kernel: [5767162.001946] Oops: 0000 [#1] SMP
Jun 10 16:11:07 helvi kernel: [5767162.002013] Modules linked in: usb_storage binfmt_misc iscsi_target_mod target_core_mod 8021q garp ipt_MASQUERADE nf_nat_masquerade_ipv4 xfrm_user xfrm_algo iptable_nat xt_addrtype iptable_filter ip_tables xt_conntrack x_tables br_netfilter bridge stp llc dm_thin_pool dm_persistent_data dm_bio_prison dm_bufio loop openvswitch nf_conntrack_ipv6 nf_nat_ipv6 nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_defrag_ipv6 nf_nat nf_conntrack configfs nfsd auth_rpcgss oid_registry nfs_acl nfs lockd grace sunrpc zfs(PO) zunicode(PO) zavl(PO) icp(PO) iTCO_wdt gpio_ich iTCO_vendor_support crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 ablk_helper cryptd lrw gf128mul glue_helper serio_raw pcspkr i2c_i801 i2c_smbus ast ftdi_sio bttv usbserial ttm tveeprom videobuf_dma_sg drm_kms_helper
Jun 10 16:11:07 helvi kernel: [5767162.003034]  tea575x syscopyarea videobuf_core sysfillrect rc_core sysimgblt v4l2_common fb_sys_fops drm videodev snd_hda_intel agpgart media snd_hda_codec lpc_ich mfd_core snd_hda_core snd_pcm btrfs snd_timer zcommon(PO) snd soundcore znvpair(PO) i7core_edac ioatdma spl(O) dca zlib_deflate i5500_temp edac_core ipmi_si ipmi_msghandler shpchp evdev acpi_cpufreq tpm_tis tpm_tis_core tpm w83795 w83627ehf hwmon_vid coretemp autofs4 hid_generic usbhid hid crc32c_intel psmouse uhci_hcd ehci_pci ehci_hcd usbcore usb_common sg sd_mod
Jun 10 16:11:07 helvi kernel: [5767162.003769] CPU: 2 PID: 1446 Comm: z_wr_iss Tainted: P           O    4.9.20.iudex.kvm.ovs.1 #1
Jun 10 16:11:07 helvi kernel: [5767162.003888] Hardware name: System manufacturer System Product Name/Z8NA-D6(C), BIOS 1303    05/10/2012
Jun 10 16:11:07 helvi kernel: [5767162.004011] task: ffff880421450000 task.stack: ffffc90005fa0000
Jun 10 16:11:07 helvi kernel: [5767162.004078] RIP: 0010:[<ffffffffa00e202e>]  [<ffffffffa00e202e>] avl_walk+0x2e/0x60 [zavl]
Jun 10 16:11:07 helvi kernel: [5767162.004175] RSP: 0018:ffffc90005fa3b38  EFLAGS: 00010202
Jun 10 16:11:07 helvi kernel: [5767162.004246] RAX: 000000009b9da09d RBX: ffff88002a903700 RCX: 0000000000000000
Jun 10 16:11:07 helvi kernel: [5767162.004350] RDX: 000000009b9da09d RSI: ffff88002a903700 RDI: ffff88002a903700
Jun 10 16:11:07 helvi kernel: [5767162.004458] RBP: ffffc90005fa3b38 R08: 0000000000000000 R09: 0000000000000000
Jun 10 16:11:07 helvi kernel: [5767162.004543] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000028000
Jun 10 16:11:07 helvi kernel: [5767162.004665] R13: ffff88082858a800 R14: 0000064ccbbc6000 R15: ffff88082ba44b00
Jun 10 16:11:07 helvi kernel: [5767162.007623] FS:  0000000000000000(0000) GS:ffff88042fc80000(0000) knlGS:0000000000000000
Jun 10 16:11:07 helvi kernel: [5767162.007725] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jun 10 16:11:07 helvi kernel: [5767162.007790] CR2: 000000009b9da09d CR3: 0000000001c08000 CR4: 00000000000006e0
Jun 10 16:11:07 helvi kernel: [5767162.007896] Stack:
Jun 10 16:11:07 helvi kernel: [5767162.007940]  ffffc90005fa3bc0 ffffffffa10d5653 ffff88082ba44800 ffffc90005fa3b70
Jun 10 16:11:07 helvi kernel: [5767162.008051]  0000000000000246 ffffc90005fa3ba0 ffffffff816d47e9 ffffffff811cd06c
Jun 10 16:11:07 helvi kernel: [5767162.008175]  0000000000000246 ffff88042f803040 0000064cab64e000 0000064cab676000
Jun 10 16:11:07 helvi kernel: [5767162.008305] Call Trace:
Jun 10 16:11:07 helvi kernel: [5767162.008432]  [<ffffffffa10d5653>] metaslab_block_picker.constprop.19+0xa3/0x100 [zfs]
Jun 10 16:11:07 helvi kernel: [5767162.008560]  [<ffffffff816d47e9>] ? __mutex_unlock_slowpath+0xa9/0x140
Jun 10 16:11:07 helvi kernel: [5767162.008632]  [<ffffffff811cd06c>] ? __kmalloc_node+0x20c/0x2c0
Jun 10 16:11:07 helvi kernel: [5767162.008734]  [<ffffffffa10d61f0>] metaslab_df_alloc+0x90/0xd0 [zfs]
Jun 10 16:11:07 helvi kernel: [5767162.008821]  [<ffffffffa10d8529>] metaslab_alloc+0x649/0xe60 [zfs]
Jun 10 16:11:07 helvi kernel: [5767162.008928]  [<ffffffffa1143f6c>] zio_dva_allocate+0xac/0x560 [zfs]
Jun 10 16:11:07 helvi kernel: [5767162.008997]  [<ffffffff816d7129>] ? _raw_spin_unlock+0x9/0x10
Jun 10 16:11:07 helvi kernel: [5767162.009070]  [<ffffffffa01bcc20>] ? tsd_hash_search.isra.0+0x70/0x90 [spl]
Jun 10 16:11:07 helvi kernel: [5767162.009143]  [<ffffffffa01bccb9>] ? tsd_get_by_thread+0x29/0x40 [spl]
Jun 10 16:11:07 helvi kernel: [5767162.009197]  [<ffffffffa01b7633>] ? taskq_member+0x13/0x20 [spl]
Jun 10 16:11:07 helvi kernel: [5767162.009307]  [<ffffffffa1140507>] zio_execute+0x97/0x100 [zfs]
Jun 10 16:11:07 helvi kernel: [5767162.009372]  [<ffffffffa01b84df>] taskq_thread+0x25f/0x490 [spl]
Jun 10 16:11:07 helvi kernel: [5767162.009435]  [<ffffffff810d1140>] ? wake_up_q+0x70/0x70
Jun 10 16:11:07 helvi kernel: [5767162.009502]  [<ffffffffa01b8280>] ? taskq_cancel_id+0x110/0x110 [spl]
Jun 10 16:11:07 helvi kernel: [5767162.009555]  [<ffffffff810c7069>] kthread+0xe9/0x100
Jun 10 16:11:07 helvi kernel: [5767162.009609]  [<ffffffff810c6f80>] ? kthread_park+0x60/0x60
Jun 10 16:11:07 helvi kernel: [5767162.009705]  [<ffffffff816d75d2>] ret_from_fork+0x22/0x30
Jun 10 16:11:07 helvi kernel: [5767162.009776] Code: 47 10 b9 01 00 00 00 29 d1 48 89 e5 4c 01 c6 48 85 f6 74 40 48 63 d2 48 89 f7 48 8b 04 d6 48 85 c0 74 1a 48 63 c9 eb 03 48 89 d0 <48> 8b 14 c8 48 85 d2 75 f4 4c 29 c0 5d c3 39 ca 74 f7 48 8b 47 
Jun 10 16:11:07 helvi kernel: [5767162.010097] RIP  [<ffffffffa00e202e>] avl_walk+0x2e/0x60 [zavl]
Jun 10 16:11:07 helvi kernel: [5767162.010165]  RSP <ffffc90005fa3b38>
Jun 10 16:11:07 helvi kernel: [5767162.010221] CR2: 000000009b9da09d
Jun 10 16:11:07 helvi kernel: [5767162.010587] ---[ end trace df26484b3ebdf0b3 ]---
Jun 10 16:11:07 helvi kernel: [5767162.010700] BUG: unable to handle kernel NULL pointer dereference at 0000000000000009
Jun 10 16:11:07 helvi kernel: [5767162.010920] IP: [<ffffffff810e4885>] __wake_up_common+0x25/0x80
Jun 10 16:11:07 helvi kernel: [5767162.011063] PGD 0 
Jun 10 16:11:07 helvi kernel: [5767162.011105] 
Jun 10 16:11:07 helvi kernel: [5767162.011221] Oops: 0000 [#2] SMP
Jun 10 16:11:07 helvi kernel: [5767162.011307] Modules linked in: usb_storage binfmt_misc iscsi_target_mod target_core_mod 8021q garp ipt_MASQUERADE nf_nat_masquerade_ipv4 xfrm_user xfrm_algo iptable_nat xt_addrtype iptable_filter ip_tables xt_conntrack x_tables br_netfilter bridge stp llc dm_thin_pool dm_persistent_data dm_bio_prison dm_bufio loop openvswitch nf_conntrack_ipv6 nf_nat_ipv6 nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_defrag_ipv6 nf_nat nf_conntrack configfs nfsd auth_rpcgss oid_registry nfs_acl nfs lockd grace sunrpc zfs(PO) zunicode(PO) zavl(PO) icp(PO) iTCO_wdt gpio_ich iTCO_vendor_support crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 ablk_helper cryptd lrw gf128mul glue_helper serio_raw pcspkr i2c_i801 i2c_smbus ast ftdi_sio bttv usbserial ttm tveeprom videobuf_dma_sg drm_kms_helper
Jun 10 16:11:07 helvi kernel: [5767162.014671]  tea575x syscopyarea videobuf_core sysfillrect rc_core sysimgblt v4l2_common fb_sys_fops drm videodev snd_hda_intel agpgart media snd_hda_codec lpc_ich mfd_core snd_hda_core snd_pcm btrfs snd_timer zcommon(PO) snd soundcore znvpair(PO) i7core_edac ioatdma spl(O) dca zlib_deflate i5500_temp edac_core ipmi_si ipmi_msghandler shpchp evdev acpi_cpufreq tpm_tis tpm_tis_core tpm w83795 w83627ehf hwmon_vid coretemp autofs4 hid_generic usbhid hid crc32c_intel psmouse uhci_hcd ehci_pci ehci_hcd usbcore usb_common sg sd_mod
Jun 10 16:11:07 helvi kernel: [5767162.017216] CPU: 2 PID: 1446 Comm: z_wr_iss Tainted: P      D    O    4.9.20.iudex.kvm.ovs.1 #1
Jun 10 16:11:07 helvi kernel: [5767162.017369] Hardware name: System manufacturer System Product Name/Z8NA-D6(C), BIOS 1303    05/10/2012
Jun 10 16:11:07 helvi kernel: [5767162.017522] task: ffff880421450000 task.stack: ffffc90005fa0000
Jun 10 16:11:07 helvi kernel: [5767162.017617] RIP: 0010:[<ffffffff810e4885>]  [<ffffffff810e4885>] __wake_up_common+0x25/0x80
Jun 10 16:11:07 helvi kernel: [5767162.017800] RSP: 0018:ffffc90005fa3e50  EFLAGS: 00010086
Jun 10 16:11:07 helvi kernel: [5767162.017894] RAX: 0000000000000286 RBX: ffffc90005fa3f08 RCX: 0000000000000000
Jun 10 16:11:07 helvi kernel: [5767162.018030] RDX: 0000000000000009 RSI: 0000000000000003 RDI: ffffc90005fa3f08
Jun 10 16:11:07 helvi kernel: [5767162.018174] RBP: ffffc90005fa3e88 R08: 0000000000000000 R09: 0000000000000000
Jun 10 16:11:07 helvi kernel: [5767162.018321] R10: 0000000000000740 R11: ffffffff81882500 R12: ffffc90005fa3f08
Jun 10 16:11:07 helvi kernel: [5767162.018440] R13: 0000000000000286 R14: 0000000000000000 R15: 0000000000000003
Jun 10 16:11:07 helvi kernel: [5767162.018575] FS:  0000000000000000(0000) GS:ffff88042fc80000(0000) knlGS:0000000000000000
Jun 10 16:11:07 helvi kernel: [5767162.018720] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jun 10 16:11:07 helvi kernel: [5767162.018805] CR2: 0000000000000009 CR3: 0000000001c08000 CR4: 00000000000006e0
Jun 10 16:11:07 helvi kernel: [5767162.018951] Stack:
Jun 10 16:11:07 helvi kernel: [5767162.019030]  0000000100000740 0000000000000000 ffffc90005fa3f08 ffffc90005fa3f00
Jun 10 16:11:07 helvi kernel: [5767162.019331]  0000000000000286 0000000000000000 000000000000000b ffffc90005fa3e98
Jun 10 16:11:07 helvi kernel: [5767162.019617]  ffffffff810e48ee ffffc90005fa3ec0 ffffffff810e52c2 ffff880421450640
Jun 10 16:11:07 helvi kernel: [5767162.019911] Call Trace:
Jun 10 16:11:07 helvi kernel: [5767162.019991]  [<ffffffff810e48ee>] __wake_up_locked+0xe/0x10
Jun 10 16:11:07 helvi kernel: [5767162.020094]  [<ffffffff810e52c2>] complete+0x32/0x50
Jun 10 16:11:07 helvi kernel: [5767162.020199]  [<ffffffff810a75f0>] mm_release+0xb0/0x130
Jun 10 16:11:07 helvi kernel: [5767162.020295]  [<ffffffff810ad4d2>] do_exit+0x132/0xb10
Jun 10 16:11:07 helvi kernel: [5767162.020386]  [<ffffffff816d9297>] rewind_stack_do_exit+0x17/0x20
Jun 10 16:11:07 helvi kernel: [5767162.020502] Code: 00 00 00 00 00 90 55 48 89 e5 41 57 41 89 f7 41 56 41 89 ce 41 55 41 54 49 89 fc 53 48 83 ec 10 89 55 cc 48 8b 57 18 4c 89 45 d0 <4c> 8b 02 48 8d 42 e8 48 39 c7 4d 8d 68 e8 75 05 eb 34 49 89 d5 
Jun 10 16:11:07 helvi kernel: [5767162.023297] RIP  [<ffffffff810e4885>] __wake_up_common+0x25/0x80
Jun 10 16:11:07 helvi kernel: [5767162.023436]  RSP <ffffc90005fa3e50>
Jun 10 16:11:07 helvi kernel: [5767162.023523] CR2: 0000000000000009
Jun 10 16:11:07 helvi kernel: [5767162.023617] ---[ end trace df26484b3ebdf0b4 ]---
Jun 10 16:11:07 helvi kernel: [5767162.023722] Fixing recursive fault but reboot is needed!
@tuomari tuomari mentioned this issue Jul 11, 2017
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@tuomari
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tuomari commented Jul 11, 2017

I just noticed that I have scrub running (since 2017-06-20), which might be also a factor.

@tuomari
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tuomari commented Jul 20, 2017

Another bug from the same system. This time with

kernel 4.9.36 and ZFS version 0.7.0-rc4_103_ge19572e4c

Jul 20 09:40:05 helvi kernel: [17518.957544] BUG: unable to handle kernel paging request at 0000000049809491
Jul 20 09:40:05 helvi kernel: [17518.957604] IP: [<ffffffffa012702e>] avl_walk+0x2e/0x60 [zavl]
Jul 20 09:40:05 helvi kernel: [17518.957641] PGD 0 
Jul 20 09:40:05 helvi kernel: [17518.957651] 
Jul 20 09:40:05 helvi kernel: [17518.957665] Oops: 0000 [#1] SMP
Jul 20 09:40:05 helvi kernel: [17518.957680] Modules linked in: binfmt_misc iscsi_target_mod target_core_mod 8021q garp ipt_MASQUERADE nf_nat_masquerade_ipv4 xfrm_user xfrm_algo iptable_nat xt_addrtype iptable_filter ip_tables xt_conntrack x_tables br_netfilter bridge stp llc dm_thin_pool dm_persistent_data dm_bio_prison dm_bufio loop openvswitch nf_conntrack_ipv6 nf_nat_ipv6 nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_defrag_ipv6 nf_nat nf_conntrack configfs nfsd auth_rpcgss oid_registry nfs_acl nfs lockd grace sunrpc zfs(PO) zunicode(PO) zavl(PO) icp(PO) iTCO_wdt iTCO_vendor_support gpio_ich usb_storage crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 ablk_helper cryptd lrw gf128mul glue_helper pcspkr serio_raw i2c_i801 i2c_smbus ftdi_sio usbserial bttv tveeprom videobuf_dma_sg tea575x videobuf_core
Jul 20 09:40:05 helvi kernel: [17518.958239]  rc_core v4l2_common ast videodev ttm media drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm snd_hda_intel snd_hda_codec agpgart snd_hda_core snd_pcm lpc_ich mfd_core snd_timer snd soundcore zcommon(PO) btrfs znvpair(PO) i7core_edac ioatdma spl(O) zlib_deflate i5500_temp dca edac_core shpchp ipmi_si ipmi_msghandler evdev acpi_cpufreq tpm_tis tpm_tis_core tpm w83795 w83627ehf hwmon_vid coretemp autofs4 hid_generic usbhid hid crc32c_intel psmouse ehci_pci uhci_hcd ehci_hcd usbcore usb_common sg sd_mod
Jul 20 09:40:05 helvi kernel: [17518.958682] CPU: 7 PID: 1462 Comm: z_wr_iss Tainted: P           O    4.9.36.iudex.kvm.ovs.1 #2
Jul 20 09:40:05 helvi kernel: [17518.958840] Hardware name: System manufacturer System Product Name/Z8NA-D6(C), BIOS 1303    05/10/2012
Jul 20 09:40:05 helvi kernel: [17518.958995] task: ffff88082c722340 task.stack: ffffc90005d18000
Jul 20 09:40:05 helvi kernel: [17518.959091] RIP: 0010:[<ffffffffa012702e>]  [<ffffffffa012702e>] avl_walk+0x2e/0x60 [zavl]
Jul 20 09:40:05 helvi kernel: [17518.959224] RSP: 0018:ffffc90005d1bb00  EFLAGS: 00010202
Jul 20 09:40:05 helvi kernel: [17518.959301] RAX: 0000000049809491 RBX: 0000000000028000 RCX: 0000000000000000
Jul 20 09:40:05 helvi kernel: [17518.959389] RDX: 0000000049809491 RSI: ffff8800205957c0 RDI: ffff8800205957c0
Jul 20 09:40:05 helvi kernel: [17518.959493] RBP: ffffc90005d1bb00 R08: 0000000000000000 R09: 0000000000000000
Jul 20 09:40:05 helvi kernel: [17518.959585] R10: ffff88041c610140 R11: 0000000000000001 R12: ffff88082bde3000
Jul 20 09:40:05 helvi kernel: [17518.959679] R13: ffff88082bde2e10 R14: ffff88082bde3000 R15: 00000000000693ad
Jul 20 09:40:05 helvi kernel: [17518.959771] FS:  0000000000000000(0000) GS:ffff88083fcc0000(0000) knlGS:0000000000000000
Jul 20 09:40:05 helvi kernel: [17518.959935] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jul 20 09:40:05 helvi kernel: [17518.960017] CR2: 0000000049809491 CR3: 0000000001c08000 CR4: 00000000000006e0
Jul 20 09:40:05 helvi kernel: [17518.960110] Stack:
Jul 20 09:40:05 helvi kernel: [17518.960178]  ffffc90005d1bb70 ffffffffa12625c8 ffff88041c610140 ffffc90005d1bb10
Jul 20 09:40:05 helvi kernel: [17518.960327]  ffff8804283ada08 ffff8804283ada48 0000000000000003 ffff8804283ada08
Jul 20 09:40:05 helvi kernel: [17518.960463]  ffffffff811cbecc 00000501d201c000 00000501d2044000 ffff88082bde2c00
Jul 20 09:40:05 helvi kernel: [17518.960626] Call Trace:
Jul 20 09:40:05 helvi kernel: [17518.960774]  [<ffffffffa12625c8>] metaslab_block_picker.constprop.13+0x48/0xb0 [zfs]
Jul 20 09:40:05 helvi kernel: [17518.960910]  [<ffffffff811cbecc>] ? __kmalloc_node+0x20c/0x2c0
Jul 20 09:40:05 helvi kernel: [17518.961063]  [<ffffffffa1263a31>] metaslab_df_alloc+0x111/0x180 [zfs]
Jul 20 09:40:05 helvi kernel: [17518.961179]  [<ffffffffa12671cf>] metaslab_alloc+0x89f/0x15a0 [zfs]
Jul 20 09:40:05 helvi kernel: [17518.961256]  [<ffffffff816da669>] ? __mutex_unlock_slowpath+0xa9/0x140
Jul 20 09:40:05 helvi kernel: [17518.961402]  [<ffffffffa12f0eea>] zio_dva_allocate+0x17a/0x930 [zfs]
Jul 20 09:40:05 helvi kernel: [17518.961491]  [<ffffffff816dcfb9>] ? _raw_spin_unlock+0x9/0x10
Jul 20 09:40:05 helvi kernel: [17518.961572]  [<ffffffffa019e300>] ? tsd_hash_search.isra.0+0x70/0x90 [spl]
Jul 20 09:40:05 helvi kernel: [17518.961644]  [<ffffffffa019e3ed>] ? tsd_get_by_thread+0x3d/0x90 [spl]
Jul 20 09:40:05 helvi kernel: [17518.961745]  [<ffffffffa0196b33>] ? taskq_member+0x13/0x20 [spl]
Jul 20 09:40:05 helvi kernel: [17518.961894]  [<ffffffffa12eae13>] zio_execute+0x103/0x320 [zfs]
Jul 20 09:40:05 helvi kernel: [17518.961985]  [<ffffffffa019802b>] taskq_thread+0x29b/0x590 [spl]
Jul 20 09:40:05 helvi kernel: [17518.962075]  [<ffffffff810d12e0>] ? wake_up_q+0x70/0x70
Jul 20 09:40:05 helvi kernel: [17518.962167]  [<ffffffffa0197d90>] ? taskq_thread_should_stop+0x80/0x80 [spl]
Jul 20 09:40:05 helvi kernel: [17518.962264]  [<ffffffff810c71f9>] kthread+0xf9/0x110
Jul 20 09:40:05 helvi kernel: [17518.962338]  [<ffffffff810c7100>] ? kthread_park+0x60/0x60
Jul 20 09:40:05 helvi kernel: [17518.962398]  [<ffffffff816dd492>] ret_from_fork+0x22/0x30
Jul 20 09:40:05 helvi kernel: [17518.962498] Code: 47 10 b9 01 00 00 00 29 d1 48 89 e5 4c 01 c6 48 85 f6 74 40 48 63 d2 48 89 f7 48 8b 04 d6 48 85 c0 74 1a 48 63 c9 eb 03 48 89 d0 <48> 8b 14 c8 48 85 d2 75 f4 4c 29 c0 5d c3 39 ca 74 f7 48 8b 47 
Jul 20 09:40:05 helvi kernel: [17518.962893] RIP  [<ffffffffa012702e>] avl_walk+0x2e/0x60 [zavl]
Jul 20 09:40:05 helvi kernel: [17518.962992]  RSP <ffffc90005d1bb00>
Jul 20 09:40:05 helvi kernel: [17518.963054] CR2: 0000000049809491
Jul 20 09:40:05 helvi kernel: [17518.963453] ---[ end trace c3710e7fb2c2eb58 ]---
Jul 20 09:40:05 helvi kernel: [17518.963582] BUG: unable to handle kernel NULL pointer dereference at 0000000000000009
Jul 20 09:40:05 helvi kernel: [17518.963846] IP: [<ffffffff810e4a15>] __wake_up_common+0x25/0x80
Jul 20 09:40:05 helvi kernel: [17518.964022] PGD 0 
Jul 20 09:40:05 helvi kernel: [17518.964080] 
Jul 20 09:40:05 helvi kernel: [17518.964210] Oops: 0000 [#2] SMP
Jul 20 09:40:05 helvi kernel: [17518.964312] Modules linked in: binfmt_misc iscsi_target_mod target_core_mod 8021q garp ipt_MASQUERADE nf_nat_masquerade_ipv4 xfrm_user xfrm_algo iptable_nat xt_addrtype iptable_filter ip_tables xt_conntrack x_tables br_netfilter bridge stp llc dm_thin_pool dm_persistent_data dm_bio_prison dm_bufio loop openvswitch nf_conntrack_ipv6 nf_nat_ipv6 nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_defrag_ipv6 nf_nat nf_conntrack configfs nfsd auth_rpcgss oid_registry nfs_acl nfs lockd grace sunrpc zfs(PO) zunicode(PO) zavl(PO) icp(PO) iTCO_wdt iTCO_vendor_support gpio_ich usb_storage crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 ablk_helper cryptd lrw gf128mul glue_helper pcspkr serio_raw i2c_i801 i2c_smbus ftdi_sio usbserial bttv tveeprom videobuf_dma_sg tea575x videobuf_core
Jul 20 09:40:05 helvi kernel: [17518.968177]  rc_core v4l2_common ast videodev ttm media drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm snd_hda_intel snd_hda_codec agpgart snd_hda_core snd_pcm lpc_ich mfd_core snd_timer snd soundcore zcommon(PO) btrfs znvpair(PO) i7core_edac ioatdma spl(O) zlib_deflate i5500_temp dca edac_core shpchp ipmi_si ipmi_msghandler evdev acpi_cpufreq tpm_tis tpm_tis_core tpm w83795 w83627ehf hwmon_vid coretemp autofs4 hid_generic usbhid hid crc32c_intel psmouse ehci_pci uhci_hcd ehci_hcd usbcore usb_common sg sd_mod
Jul 20 09:40:05 helvi kernel: [17518.971158] CPU: 7 PID: 1462 Comm: z_wr_iss Tainted: P      D    O    4.9.36.iudex.kvm.ovs.1 #2
Jul 20 09:40:05 helvi kernel: [17518.971336] Hardware name: System manufacturer System Product Name/Z8NA-D6(C), BIOS 1303    05/10/2012
Jul 20 09:40:05 helvi kernel: [17518.971529] task: ffff88082c722340 task.stack: ffffc90005d18000
Jul 20 09:40:05 helvi kernel: [17518.971633] RIP: 0010:[<ffffffff810e4a15>]  [<ffffffff810e4a15>] __wake_up_common+0x25/0x80
Jul 20 09:40:05 helvi kernel: [17518.971860] RSP: 0018:ffffc90005d1be50  EFLAGS: 00010086
Jul 20 09:40:05 helvi kernel: [17518.971974] RAX: 0000000000000286 RBX: ffffc90005d1bf08 RCX: 0000000000000000
Jul 20 09:40:05 helvi kernel: [17518.972074] RDX: 0000000000000009 RSI: 0000000000000003 RDI: ffffc90005d1bf08
Jul 20 09:40:05 helvi kernel: [17518.972185] RBP: ffffc90005d1be88 R08: 0000000000000000 R09: 0000000000000000
Jul 20 09:40:05 helvi kernel: [17518.972292] R10: 00000000000005d2 R11: ffffffff81882500 R12: ffffc90005d1bf08
Jul 20 09:40:05 helvi kernel: [17518.972422] R13: 0000000000000286 R14: 0000000000000000 R15: 0000000000000003
Jul 20 09:40:05 helvi kernel: [17518.972525] FS:  0000000000000000(0000) GS:ffff88083fcc0000(0000) knlGS:0000000000000000
Jul 20 09:40:05 helvi kernel: [17518.972679] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jul 20 09:40:05 helvi kernel: [17518.972762] CR2: 0000000000000009 CR3: 0000000001c08000 CR4: 00000000000006e0
Jul 20 09:40:05 helvi kernel: [17518.972869] Stack:
Jul 20 09:40:05 helvi kernel: [17518.972971]  00000001000005d2 0000000000000000 ffffc90005d1bf08 ffffc90005d1bf00
Jul 20 09:40:05 helvi kernel: [17518.973255]  0000000000000286 0000000000000000 000000000000000b ffffc90005d1be98
Jul 20 09:40:05 helvi kernel: [17518.973578]  ffffffff810e4a7e ffffc90005d1bec0 ffffffff810e5452 ffff88082c722980
Jul 20 09:40:05 helvi kernel: [17518.973962] Call Trace:
Jul 20 09:40:05 helvi kernel: [17518.974074]  [<ffffffff810e4a7e>] __wake_up_locked+0xe/0x10
Jul 20 09:40:05 helvi kernel: [17518.974189]  [<ffffffff810e5452>] complete+0x32/0x50
Jul 20 09:40:05 helvi kernel: [17518.974314]  [<ffffffff810a7680>] mm_release+0xb0/0x130
Jul 20 09:40:05 helvi kernel: [17518.974460]  [<ffffffff810ad602>] do_exit+0x132/0xb10
Jul 20 09:40:05 helvi kernel: [17518.974570]  [<ffffffff816df157>] rewind_stack_do_exit+0x17/0x20
Jul 20 09:40:05 helvi kernel: [17518.974700] Code: 00 00 00 00 00 90 55 48 89 e5 41 57 41 89 f7 41 56 41 89 ce 41 55 41 54 49 89 fc 53 48 83 ec 10 89 55 cc 48 8b 57 18 4c 89 45 d0 <4c> 8b 02 48 8d 42 e8 48 39 c7 4d 8d 68 e8 75 05 eb 34 49 89 d5 
Jul 20 09:40:05 helvi kernel: [17518.977738] RIP  [<ffffffff810e4a15>] __wake_up_common+0x25/0x80
Jul 20 09:40:05 helvi kernel: [17518.977913]  RSP <ffffc90005d1be50>
Jul 20 09:40:05 helvi kernel: [17518.978018] CR2: 0000000000000009
Jul 20 09:40:05 helvi kernel: [17518.978129] ---[ end trace c3710e7fb2c2eb59 ]---
Jul 20 09:40:05 helvi kernel: [17518.978252] Fixing recursive fault but reboot is needed!

@tuomari tuomari mentioned this issue Jul 21, 2017
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tuomari commented Feb 27, 2018

Have not encountered this in a while. Assume fixed

@tuomari tuomari closed this as completed Feb 27, 2018
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