Comment 0 for bug 1940083

zfs send -I works well:

# uname -a
Linux sdeziel-desktop 5.11.0-27-generic #29~20.04.1-Ubuntu SMP Wed Aug 11 15:58:17 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
# zfs send -I data/simon/musique@laptop-2020-11-30 data/simon/musique@o | wc -c
5660616
# dmesg -c
#

but when sending encrypted data sets, some snapshot combinations cause problem:

# zfs send -wI data/simon/musique@laptop-2020-11-30 data/simon/musique@o | wc -c
# # hung as nothing is written to the pipe.

# dmesg -c
[ 1179.862792] BUG: kernel NULL pointer dereference, address: 0000000000000030
[ 1179.862798] #PF: supervisor read access in kernel mode
[ 1179.862801] #PF: error_code(0x0000) - not-present page
[ 1179.862803] PGD 0 P4D 0
[ 1179.862806] Oops: 0000 [#5] SMP PTI
[ 1179.862809] CPU: 1 PID: 13834 Comm: zfs Tainted: P D IO 5.11.0-27-generic #29~20.04.1-Ubuntu
[ 1179.862813] Hardware name: /D54250WYK, BIOS WYLPT10H.86A.0054.2019.0902.1752 09/02/2019
[ 1179.862815] RIP: 0010:dmu_dump_write+0x22c/0x320 [zfs]
[ 1179.862922] Code: d0 48 89 43 58 49 8b 45 60 48 89 43 38 49 8b 45 68 48 89 43 40 49 8b 45 70 48 89 43 48 49 8b 45 78 48 89 43 50 e9 9f fe ff ff <49> 8b 45 30 45 85 c0 74 39 48 85 c0 78 04 80 4b 31 02 48 8d 53 70
[ 1179.862924] RSP: 0018:ffffa51ae62678f0 EFLAGS: 00010206
[ 1179.862927] RAX: d1141450686f75df RBX: ffff952730fdde00 RCX: 0000000000000000
[ 1179.862929] RDX: 00000000000080f7 RSI: 0000000000000013 RDI: ffff952730fddf38
[ 1179.862931] RBP: ffffa51ae6267938 R08: 0000000001000000 R09: 0000000000020000
[ 1179.862933] R10: 00000000000080f7 R11: 0000000000020000 R12: ffffa51ae6267ab8
[ 1179.862935] R13: 0000000000000000 R14: 0000000000020000 R15: 0000000000000000
[ 1179.862937] FS: 00007fa6a03ac7c0(0000) GS:ffff95298fa80000(0000) knlGS:0000000000000000
[ 1179.862939] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1179.862941] CR2: 0000000000000030 CR3: 000000025a648001 CR4: 00000000001706e0
[ 1179.862943] Call Trace:
[ 1179.862945] ? wait_woken+0x80/0x80
[ 1179.862951] do_dump+0x5da/0x900 [zfs]
[ 1179.863035] ? spl_kmem_free+0x28/0x30 [spl]
[ 1179.863046] dmu_send_impl+0xdf6/0x1570 [zfs]
[ 1179.863129] ? dbuf_rele_and_unlock+0x32e/0x6d0 [zfs]
[ 1179.863204] ? dbuf_rele+0x3d/0x50 [zfs]
[ 1179.863279] ? dmu_buf_rele+0xe/0x10 [zfs]
[ 1179.863354] dmu_send_obj+0x24c/0x360 [zfs]
[ 1179.863435] ? mze_find+0xd4/0xf0 [zfs]
[ 1179.863551] zfs_ioc_send+0x11d/0x2c0 [zfs]
[ 1179.863665] ? zfs_ioc_send+0x2c0/0x2c0 [zfs]
[ 1179.863778] zfsdev_ioctl_common+0x679/0x930 [zfs]
[ 1179.863892] ? __kmalloc_node+0x40d/0x4e0
[ 1179.863899] zfsdev_ioctl+0x57/0xe0 [zfs]
[ 1179.864008] __x64_sys_ioctl+0x91/0xc0
[ 1179.864012] do_syscall_64+0x38/0x90
[ 1179.864018] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 1179.864023] RIP: 0033:0x7fa6a09a050b
[ 1179.864026] Code: 0f 1e fa 48 8b 05 85 39 0d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 55 39 0d 00 f7 d8 64 89 01 48
[ 1179.864028] RSP: 002b:00007ffdb9687fb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 1179.864032] RAX: ffffffffffffffda RBX: 000055dd6be41f60 RCX: 00007fa6a09a050b
[ 1179.864033] RDX: 00007ffdb968b5c0 RSI: 0000000000005a1c RDI: 0000000000000003
[ 1179.864035] RBP: 00007ffdb968b580 R08: 0000000000005a1c R09: 0000000000000003
[ 1179.864037] R10: 0000000000000009 R11: 0000000000000246 R12: 00007ffdb968b5c0
[ 1179.864038] R13: 000055dd6be41f70 R14: 0000000000000000 R15: 0000000000000001
[ 1179.864041] Modules linked in: vhost_vsock vmw_vsock_virtio_transport_common vhost vhost_iotlb vsock ccm nf_log_ipv6 ip6table_filter ip6table_nat ip6t_rpfilter ip6table_mangle ip6table_raw ip6_tables nf_log_ipv4 nf_log_common xt_owner xt_LOG xt_conntrack iptable_filter xt_MASQUERADE xt_nat xt_tcpudp iptable_nat nf_nat iptable_mangle iptable_raw bpfilter nls_iso8859_1 zfs(PO) zunicode(PO) zzstd(O) zlua(O) zavl(PO) icp(PO) zcommon(PO) znvpair(PO) intel_rapl_msr spl(O) intel_rapl_common snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio x86_pkg_temp_thermal snd_hda_codec_hdmi intel_powerclamp coretemp snd_hda_intel snd_intel_dspcfg mei_hdcp kvm_intel soundwire_intel at24 soundwire_generic_allocation kvm soundwire_cadence snd_hda_codec snd_hda_core soundwire_bus crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_soc_core rapl snd_usb_audio snd_compress ac97_bus intel_cstate snd_pcm_dmaengine iwldvm uvcvideo videobuf2_vmalloc btusb snd_usbmidi_lib btrtl snd_hwdep btbcm mac80211
[ 1179.864103] snd_seq_midi libarc4 efi_pstore videobuf2_memops btintel snd_seq_midi_event videobuf2_v4l2 wmi_bmof snd_rawmidi iwlwifi videobuf2_common bluetooth snd_pcm ecdh_generic snd_seq videodev ecc snd_seq_device mc snd_timer cfg80211 mei_me snd i2c_i801 mei e1000e lpc_ich i2c_smbus soundcore sch_fq_codel nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 msr ip_tables x_tables autofs4 btrfs blake2b_generic libcrc32c xor raid6_pq hid_generic usbhid hid dm_crypt aesni_intel i915 glue_helper i2c_algo_bit crypto_simd drm_kms_helper cryptd syscopyarea sysfillrect sysimgblt fb_sys_fops cec rc_core drm ahci libahci xhci_pci wmi xhci_pci_renesas mac_hid video
[ 1179.864157] CR2: 0000000000000030
[ 1179.864159] ---[ end trace 8e7cbf6bc2c0c353 ]---
[ 1179.864524] RIP: 0010:dmu_dump_write+0x22c/0x320 [zfs]
[ 1179.864610] Code: d0 48 89 43 58 49 8b 45 60 48 89 43 38 49 8b 45 68 48 89 43 40 49 8b 45 70 48 89 43 48 49 8b 45 78 48 89 43 50 e9 9f fe ff ff <49> 8b 45 30 45 85 c0 74 39 48 85 c0 78 04 80 4b 31 02 48 8d 53 70
[ 1179.864613] RSP: 0018:ffffa51ac8f878f0 EFLAGS: 00010206
[ 1179.864616] RAX: d1141450686f75df RBX: ffff9526877d4a00 RCX: 0000000000000000
[ 1179.864618] RDX: 00000000000080f7 RSI: 0000000000000013 RDI: ffff9526877d4b38
[ 1179.864620] RBP: ffffa51ac8f87938 R08: 0000000001000000 R09: 0000000000020000
[ 1179.864622] R10: 00000000000080f7 R11: 0000000000020000 R12: ffffa51ac8f87ab8
[ 1179.864623] R13: 0000000000000000 R14: 0000000000020000 R15: 0000000000000000
[ 1179.864625] FS: 00007fa6a03ac7c0(0000) GS:ffff95298fa80000(0000) knlGS:0000000000000000
[ 1179.864628] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1179.864630] CR2: 0000000000000030 CR3: 000000025a648001 CR4: 00000000001706e0

Additional information:

$ lsb_release -rd
Description: Ubuntu 20.04.2 LTS
Release: 20.04

$ zfs --version
zfs-0.8.3-1ubuntu12.12
zfs-kmod-2.0.2-1ubuntu5

$ apt-cache policy linux-image-5.11.0-27-generic zfsutils-linux
linux-image-5.11.0-27-generic:
  Installed: 5.11.0-27.29~20.04.1
  Candidate: 5.11.0-27.29~20.04.1
  Version table:
 *** 5.11.0-27.29~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        100 /var/lib/dpkg/status
zfsutils-linux:
  Installed: 0.8.3-1ubuntu12.12
  Candidate: 0.8.3-1ubuntu12.12
  Version table:
 *** 0.8.3-1ubuntu12.12 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     0.8.3-1ubuntu12.9 500
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
     0.8.3-1ubuntu12 500
        500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages