Indeed, I have no way of reproducing reliably, unfortunately. I've installed the PPA your provided (thanks!):
# dmesg | grep ZFS [ 18.284162] ZFS: Loaded module v0.8.3-1ubuntu12.5~lp1900889, ZFS pool version 5000, ZFS filesystem version 5 So far, no problem to report and I'll let you know how it goes over the next few days. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to zfs-linux in Ubuntu. https://bugs.launchpad.net/bugs/1900889 Title: BUG: kernel NULL pointer dereference, address: 0000000000000000 Status in zfs-linux package in Ubuntu: New Bug description: While zfs send'ing from Bionic to Focal, my send/recv hung midway and I found this in the receiver's dmesg: BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] SMP PTI CPU: 0 PID: 94310 Comm: receive_writer Tainted: P O 5.4.0-52-generic #57-Ubuntu Hardware name: System manufacturer System Product Name/C60M1-I, BIOS 0502 05/22/2014 RIP: 0010:abd_verify+0xa/0x40 [zfs] Code: ff 85 c0 74 12 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 5b 5d c3 e8 04 ff ff ff eb e7 c3 90 55 48 89 e5 41 54 53 48 89 fb <8b> 3f e8 0f ff ff ff 85 c0 75 22 44 8b 63 1c 48 8b 7b 20 4d 85 e4 RSP: 0018:ffffb797c555baa8 EFLAGS: 00010286 RAX: 0000000000004000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000004000 RSI: 0000000000004000 RDI: 0000000000000000 RBP: ffffb797c555bab8 R08: 0000000000000253 R09: 0000000000000000 R10: ffff953b56a17848 R11: 0000000000000000 R12: 0000000000004000 R13: ffff953ad201d280 R14: 0000000000004000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff953b56a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000151ab4000 CR4: 00000000000006f0 Call Trace: abd_borrow_buf+0x19/0x60 [zfs] abd_borrow_buf_copy+0x1a/0x50 [zfs] zio_crypt_copy_dnode_bonus+0x30/0x130 [zfs] arc_buf_untransform_in_place.isra.0+0x2b/0x40 [zfs] arc_buf_fill+0x1f0/0x4a0 [zfs] arc_untransform+0x22/0x90 [zfs] dbuf_read_verify_dnode_crypt+0xed/0x160 [zfs] ? atomic_cmpxchg+0x16/0x30 [zfs] dbuf_read_impl+0x3ea/0x610 [zfs] dbuf_read+0xcb/0x5f0 [zfs] ? arc_space_consume+0x54/0xe0 [zfs] ? do_raw_spin_unlock+0x9/0x10 [zfs] ? __raw_spin_unlock+0x9/0x10 [zfs] dmu_bonus_hold_by_dnode+0x92/0x190 [zfs] receive_object+0x442/0xae0 [zfs] ? __list_del_entry.isra.0+0x22/0x30 [zfs] ? atomic_dec+0xd/0x20 [spl] receive_process_record+0x170/0x1c0 [zfs] receive_writer_thread+0x9a/0x150 [zfs] ? receive_process_record+0x1c0/0x1c0 [zfs] thread_generic_wrapper+0x83/0xa0 [spl] kthread+0x104/0x140 ? clear_bit+0x20/0x20 [spl] ? kthread_park+0x90/0x90 ret_from_fork+0x22/0x40 Modules linked in: ip6table_filter ip6_tables xt_conntrack iptable_filter bpfilter zfs(PO) zunicode(PO) zavl(PO) icp(PO) zcommon(PO) znvpair(PO) spl(O) nls_iso8859_1 zlua(PO) eeepc_wmi asus_wmi sparse_keymap wmi_bmof video ccp radeon kvm r8169 realtek k10temp ttm i2c_piix4 drm_kms_helper i2c_algo_bit fb_sys_fops syscopyarea sysfillrect sysimgblt wmi sch_fq_codel nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 veth bridge 8021q garp mrp stp llc xt_tcpudp xt_owner xt_LOG nf_log_ipv6 nf_log_ipv4 nf_log_common drm ip_tables x_tables autofs4 btrfs libcrc32c xor zstd_compress raid6_pq hid_generic usbhid hid ahci libahci mac_hid CR2: 0000000000000000 ---[ end trace 374aa76997d6bc9b ]--- RIP: 0010:abd_verify+0xa/0x40 [zfs] Code: ff 85 c0 74 12 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 5b 5d c3 e8 04 ff ff ff eb e7 c3 90 55 48 89 e5 41 54 53 48 89 fb <8b> 3f e8 0f ff ff ff 85 c0 75 22 44 8b 63 1c 48 8b 7b 20 4d 85 e4 RSP: 0018:ffffb797c555baa8 EFLAGS: 00010286 RAX: 0000000000004000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000004000 RSI: 0000000000004000 RDI: 0000000000000000 RBP: ffffb797c555bab8 R08: 0000000000000253 R09: 0000000000000000 R10: ffff953b56a17848 R11: 0000000000000000 R12: 0000000000004000 R13: ffff953ad201d280 R14: 0000000000004000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff953b56a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000151ab4000 CR4: 00000000000006f0 The receiving side uses ZFS native encryption and had the key manually loaded before sending/receiving. The sending side is unencrypted. The recv hung after 611MiB out of the 990.4 MB delta. Additional information: sending side is a laptop running Bionic: $ uname -a Linux simon-lemur 5.4.0-52-generic #57~18.04.1-Ubuntu SMP Thu Oct 15 14:04:49 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux $ dpkg -l| grep zfs ii libzfs2linux 0.7.5-1ubuntu16.10 amd64 OpenZFS filesystem library for Linux ii zfsutils-linux 0.7.5-1ubuntu16.10 amd64 command-line tools to manage OpenZFS filesystems receiving side is a small server running Focal: $ uname -a Linux ocelot 5.4.0-52-generic #57-Ubuntu SMP Thu Oct 15 10:57:00 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux $ dpkg -l| grep zfs ii libzfs2linux 0.8.3-1ubuntu12.4 amd64 OpenZFS filesystem library for Linux ii zfs-zed 0.8.3-1ubuntu12.4 amd64 OpenZFS Event Daemon ii zfsutils-linux 0.8.3-1ubuntu12.4 amd64 command-line tools to manage OpenZFS filesystems To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1900889/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
