Public bug reported:
The backport of upstream commit 68dde63d138882860109178f4ab0b7b1b1bb3cfd in
0.8.3-1ubuntu14 is not correct for the 0.8.3 stable series and causes an oops
on boot with a 5.7 kernel. The patch that shipped in 0.8.4 is slightly
different, and works correctly:
https://github.com/openzfs/zfs/commit/e6142ac0f28891a0ef3de366a45bb857a17ee25a
[ 13.848194] BUG: kernel NULL pointer dereference, address: 0000000000000040
[ 13.848415] #PF: supervisor write access in kernel mode
[ 13.848572] #PF: error_code(0x0002) - not-present page
[ 13.848813] PGD 0 P4D 0
[ 13.848896] Oops: 0002 [#1] SMP PTI
[ 13.849006] CPU: 3 PID: 1501 Comm: z_zvol Tainted: P OE
5.7.0-rc7-customskl #1
[ 13.849254] Hardware name: System manufacturer System Product Name/ROG
MAXIMUS X HERO (WI-FI AC), BIOS 2301 02/25/2020
[ 13.849623] RIP: 0010:zvol_create_minor_impl+0x52a/0x810 [zfs]
[ 13.849800] Code: 48 8b 54 24 18 49 89 87 08 01 00 00 48 8b 44 24 20 49 89
97 10 01 00 00 49 8b 97 a8 01 00 00 49 89 87 00 01 00 00 48 c1 e8 09 <48> 89 42
40 49 8b bf b0 01 00 00 e8 f6 3e f2 cf 49 8b bf b0 01 00
[ 13.850346] RSP: 0018:ffffb75ac1df7cf8 EFLAGS: 00010206
[ 13.850504] RAX: 0000000002000000 RBX: 3471fa85c299b9ef RCX: 0000000000000000
[ 13.850715] RDX: 0000000000000000 RSI: 0000000000008000 RDI: ffffa286a5775000
[ 13.850926] RBP: ffffa286a0c60fb0 R08: ffffa286ae55580f R09: 0000000000000000
[ 13.851137] R10: ffffa286ae55582c R11: ffffa286ae55580f R12: 0000000000000000
[ 13.851347] R13: 0000000000000000 R14: ffffa286962ff380 R15: ffffa286ac071800
[ 13.851560] FS: 0000000000000000(0000) GS:ffffa286beac0000(0000)
knlGS:0000000000000000
[ 13.851799] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 13.851970] CR2: 0000000000000040 CR3: 000000051f20a001 CR4: 00000000003606e0
[ 13.852181] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 13.852392] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 13.852602] Call Trace:
[ 13.852733] zvol_task_cb+0x258/0x570 [zfs]
[ 13.852867] ? __schedule+0x1d8/0x560
[ 13.852988] taskq_thread+0x2c3/0x490 [spl]
[ 13.853119] ? __switch_to_asm+0x34/0x70
[ 13.853241] ? wake_up_q+0xa0/0xa0
[ 13.853350] kthread+0xfb/0x130
[ 13.853453] ? task_done+0x90/0x90 [spl]
[ 13.853573] ? kthread_park+0x90/0x90
[ 13.853686] ret_from_fork+0x35/0x40
[ 13.853797] Modules linked in: input_leds btusb uvcvideo btbcm btrtl
videobuf2_vmalloc btintel videobuf2_memops snd_usb_audio videobuf2_v4l2
bluetooth videobuf2_common hid_generic videodev snd_usbmidi_lib ecdh_generic mc
usbhid ecc intel_rapl_msr intel_rapl_common uas usb_storage zfs(POE)
x86_pkg_temp_thermal zunicode(POE) intel_powerclamp zlua(POE) mxm_wmi
snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio snd_hda_codec_hdmi
snd_hda_intel amdgpu snd_intel_dspcfg crct10dif_pclmul snd_hda_codec
crc32_pclmul crc32c_intel snd_hwdep snd_hda_core rtwpci snd_pcm_oss rtw88
snd_mixer_oss zcommon(POE) ghash_clmulni_intel snd_pcm znvpair(POE) vfat
zavl(POE) icp(POE) fat snd_seq_oss spl(OE) mac80211 snd_seq_midi mfd_core
gpu_sched i2c_algo_bit aesni_intel snd_rawmidi ttm snd_seq_midi_event
crypto_simd xhci_pci snd_seq xhci_hcd cryptd deflate snd_seq_device
drm_kms_helper glue_helper efi_pstore cfg80211 e1000e snd_timer syscopyarea
intel_cstate sysfillrect rfkill ptp sysimgblt efivars pps_core
[ 13.853860] i2c_i801 usbcore snd libarc4 sr_mod intel_rapl_perf fb_sys_fops
cec cdrom mei_hdcp usb_common sg rc_core soundcore video wmi acpi_pad button
squashfs sch_fq_codel coretemp hwmon loop drm i2c_core nfsd auth_rpcgss nfs_acl
lockd grace sunrpc ip_tables x_tables
[ 13.857103] CR2: 0000000000000040
[ 13.857207] ---[ end trace a20c8291d85b28f4 ]---
[ 13.994917] RIP: 0010:zvol_create_minor_impl+0x52a/0x810 [zfs]
[ 13.994993] Code: 48 8b 54 24 18 49 89 87 08 01 00 00 48 8b 44 24 20 49 89
97 10 01 00 00 49 8b 97 a8 01 00 00 49 89 87 00 01 00 00 48 c1 e8 09 <48> 89 42
40 49 8b bf b0 01 00 00 e8 f6 3e f2 cf 49 8b bf b0 01 00
[ 13.997900] RSP: 0018:ffffb75ac1df7cf8 EFLAGS: 00010206
[ 14.000564] RAX: 0000000002000000 RBX: 3471fa85c299b9ef RCX: 0000000000000000
[ 14.003239] RDX: 0000000000000000 RSI: 0000000000008000 RDI: ffffa286a5775000
[ 14.005901] RBP: ffffa286a0c60fb0 R08: ffffa286ae55580f R09: 0000000000000000
[ 14.008580] R10: ffffa286ae55582c R11: ffffa286ae55580f R12: 0000000000000000
[ 14.011210] R13: 0000000000000000 R14: ffffa286962ff380 R15: ffffa286ac071800
[ 14.013877] FS: 0000000000000000(0000) GS:ffffa286beac0000(0000)
knlGS:0000000000000000
[ 14.016555] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 14.019184] CR2: 0000000000000040 CR3: 0000000c074fc006 CR4: 00000000003606e0
[ 14.021851] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 14.024495] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
** Affects: zfs-linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: groovy
** Tags added: groovy
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https://bugs.launchpad.net/bugs/1881427
Title:
zfs-linux 0.8.3-1ubuntu14 has a broken backport of Linux 5.7 compat
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