For reference, the splat was:
[ 2465.077373] BUG: kernel NULL pointer dereference, address: 0000000000000000
[ 2465.077397] #PF: supervisor read access in kernel mode
[ 2465.077403] #PF: error_code(0x0000) - not-present page
[ 2465.077409] PGD 0 P4D 0
[ 2465.077415] Oops: 0000 [#1] SMP NOPTI
[ 2465.077422] CPU: 0 PID: 23215 Comm: receive_writer Tainted: P O
5.4.0-21-generic #25-Ubuntu
[ 2465.077433] Hardware name: System manufacturer System Product
Name/P5LD2-X/1333, BIOS 0214 12/23/2008
[ 2465.077619] RIP: 0010:abd_verify+0xa/0x40 [zfs]
[ 2465.077626] 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
[ 2465.077642] RSP: 0018:ffffb28b51f6f998 EFLAGS: 00010282
[ 2465.077649] RAX: 0000000000004000 RBX: 0000000000000000 RCX: 0000000000000000
[ 2465.077656] RDX: 0000000000004000 RSI: 0000000000004000 RDI: 0000000000000000
[ 2465.077662] RBP: ffffb28b51f6f9a8 R08: 00000000000003da R09: 000000000045e54c
[ 2465.077669] R10: 00000000000036bf R11: 0000000000000000 R12: 0000000000004000
[ 2465.077675] R13: ffff8ff6af5bd5f0 R14: 0000000000004000 R15: 0000000000000000
[ 2465.077683] FS: 0000000000000000(0000) GS:ffff8ff70c600000(0000)
knlGS:0000000000000000
[ 2465.077691] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2465.077697] CR2: 0000000000000000 CR3: 0000000058e50000 CR4: 00000000000006f0
[ 2465.077704] Call Trace:
[ 2465.077754] abd_borrow_buf+0x19/0x60 [zfs]
[ 2465.077801] abd_borrow_buf_copy+0x1a/0x50 [zfs]
[ 2465.077873] zio_crypt_copy_dnode_bonus+0x30/0x130 [zfs]
[ 2465.077922] arc_buf_untransform_in_place.isra.0+0x2b/0x40 [zfs]
[ 2465.077971] arc_buf_fill+0x1f0/0x4a0 [zfs]
[ 2465.078021] arc_untransform+0x22/0x90 [zfs]
[ 2465.078070] dbuf_read_verify_dnode_crypt+0xed/0x160 [zfs]
[ 2465.078141] ? atomic_cmpxchg+0x16/0x30 [zfs]
[ 2465.078191] dbuf_read_impl+0x117/0x610 [zfs]
[ 2465.078240] ? atomic64_add_return+0x12/0x30 [zfs]
[ 2465.078291] dbuf_read+0xcb/0x5f0 [zfs]
[ 2465.078340] ? dbuf_hold_impl+0x2f/0x40 [zfs]
[ 2465.078395] dmu_tx_check_ioerr+0x70/0xd0 [zfs]
[ 2465.078450] dmu_tx_hold_free_impl+0x12c/0x240 [zfs]
[ 2465.078507] dmu_tx_hold_free+0x40/0x50 [zfs]
[ 2465.078559] dmu_free_long_range_impl+0x124/0x350 [zfs]
[ 2465.078612] dmu_free_long_range+0x74/0xc0 [zfs]
[ 2465.078665] dmu_free_long_object+0x27/0xc0 [zfs]
[ 2465.078720] receive_freeobjects.isra.0+0x7a/0x100 [zfs]
[ 2465.078777] receive_process_record+0x89/0x1c0 [zfs]
[ 2465.078833] receive_writer_thread+0x9a/0x150 [zfs]
[ 2465.078889] ? receive_process_record+0x1c0/0x1c0 [zfs]
[ 2465.078910] thread_generic_wrapper+0x83/0xa0 [spl]
[ 2465.078919] kthread+0x104/0x140
[ 2465.078929] ? clear_bit+0x20/0x20 [spl]
[ 2465.078934] ? kthread_park+0x90/0x90
[ 2465.078941] ret_from_fork+0x1f/0x40
[ 2465.078946] Modules linked in: nfnetlink xt_CHECKSUM xt_MASQUERADE
xt_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp ip6table_mangle ip6table_nat
iptable_mangle iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4
ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter bpfilter
essiv authenc dm_crypt zfs(PO) zunicode(PO) zavl(PO) icp(PO) zcommon(PO)
znvpair(PO) spl(O) zlua(PO) snd_ctxfi snd_pcm snd_timer snd soundcore
input_leds 8021q garp mrp asus_atk0110 kvm_intel bridge stp llc mac_hid kvm
serio_raw sch_fq_codel nfsd nfs_acl lockd grace auth_rpcgss hwmon_vid coretemp
sunrpc ip_tables x_tables autofs4 btrfs xor zstd_compress hid_generic usbhid
hid raid6_pq libcrc32c nouveau mxm_wmi wmi gpio_ich video i2c_algo_bit ttm
drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops r8169 i2c_i801
pata_acpi lpc_ich drm realtek
[ 2465.079029] CR2: 0000000000000000
[ 2465.079035] ---[ end trace 7a059aed43188006 ]---
[ 2465.079084] RIP: 0010:abd_verify+0xa/0x40 [zfs]
[ 2465.079090] 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
[ 2465.079104] RSP: 0018:ffffb28b51f6f998 EFLAGS: 00010282
[ 2465.079110] RAX: 0000000000004000 RBX: 0000000000000000 RCX: 0000000000000000
[ 2465.079116] RDX: 0000000000004000 RSI: 0000000000004000 RDI: 0000000000000000
[ 2465.079411] RBP: ffffb28b51f6f9a8 R08: 00000000000003da R09: 000000000045e54c
[ 2465.079702] R10: 00000000000036bf R11: 0000000000000000 R12: 0000000000004000
[ 2465.079993] R13: ffff8ff6af5bd5f0 R14: 0000000000004000 R15: 0000000000000000
[ 2465.080279] FS: 0000000000000000(0000) GS:ffff8ff70c600000(0000)
knlGS:0000000000000000
[ 2465.080571] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2465.080883] CR2: 0000000000000000 CR3: 0000000058e50000 CR4: 00000000000006f0
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Colin Ian King (colin-king)
** Changed in: linux (Ubuntu)
Status: Confirmed => Triaged
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https://bugs.launchpad.net/bugs/1870559
Title:
Kernel NULL pointer dereference while receiving zfs snapshots
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