Kernel bugs out with packet writing on DVD RW, system remains unable to shutdown cleanly and needs power cycling

[Sergio Callegari]

Hi,
trying to use packet writing on a DVD RW media with ubuntu 20.04 I see a kernel bug.

This is what I am doing:

1) Preparing a dvdrw with the udf filesystem with mkudffs --media-type=dvdrw --spartable=2 /dev/pktcdvd/pktcdvd0 after having erased it with growisofs -Z /dev/sr0=/dev/zero.

2) Mouting the filesystem

3) Trying to write some files on it

I see the writeback cache getting dirty and then staying dirty forever, while the kernel says

 ------------[ cut here ]------------
[ 1738.892880] kernel BUG at drivers/block/pktcdvd.c:2411!
[ 1738.892894] invalid opcode: 0000 [#1] SMP NOPTI
[ 1738.892902] CPU: 0 PID: 8493 Comm: kworker/u16:5 Tainted: G OE 5.11.0-41-generic #45~20.04.1-Ubuntu
[ 1738.892909] Hardware name: SCHENKER SCHENKER_SLIM14_SSL14L19/N141CU , BIOS 1.07.04RTR1 10/02/2019
[ 1738.892913] Workqueue: writeback wb_workfn (flush-252:0)
[ 1738.892927] RIP: 0010:pkt_submit_bio+0x39d/0x4b0 [pktcdvd]
[ 1738.892939] Code: 41 3b 45 40 7c 0b 41 83 7d 44 01 0f 84 cd 00 00 00 4c 89 ff c6 07 00 0f 1f 40 00 4c 89 e7 c6 07 00 0f 1f 40 00 e9 08 ff ff ff <0f> 0b 0f 0b 4c 89 c8 31 c9 e9 96 fe ff ff 48 c7 c2 e0 17 44 c1 be
[ 1738.892945] RSP: 0018:ffffb84c43bd3728 EFLAGS: 00010283
[ 1738.892950] RAX: 00000000000017a8 RBX: ffff97508f66f800 RCX: 00000000000017a7
[ 1738.892955] RDX: 0000000000001980 RSI: 00000000000017c0 RDI: 0000000000000040
[ 1738.892958] RBP: ffffb84c43bd37a0 R08: 0000000000000200 R09: ffffffffffffffc0
[ 1738.892962] R10: 0000000000001780 R11: 0000000000000000 R12: ffff974fd2412800
[ 1738.892966] R13: 00000000ffffffff R14: ffff97513f5f2800 R15: ffff9751584f9f50
[ 1738.892970] FS: 0000000000000000(0000) GS:ffff975330600000(0000) knlGS:0000000000000000
[ 1738.892975] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1738.892979] CR2: 00000000039f9000 CR3: 00000003dfe10005 CR4: 00000000003726f0
[ 1738.892984] Call Trace:
[ 1738.892987] ? ktime_get+0x3e/0xa0
[ 1738.892997] ? blk_queue_enter+0x18d/0x240
[ 1738.893005] ? submit_bio_checks+0x1d0/0x5d0
[ 1738.893011] ? mempool_alloc_slab+0x17/0x20
[ 1738.893017] ? mempool_alloc+0x64/0x180
[ 1738.893023] submit_bio_noacct+0x112/0x4f0
[ 1738.893030] submit_bio+0x51/0x1a0
[ 1738.893036] ? bio_add_page+0x3b/0x90
[ 1738.893045] __mpage_writepage+0x7fe/0x8f0
[ 1738.893052] ? find_get_pages_range_tag+0x26c/0x300
[ 1738.893057] ? __mod_memcg_lruvec_state+0x25/0xe0
[ 1738.893063] ? clear_page_dirty_for_io+0xdb/0x1b0
[ 1738.893071] write_cache_pages+0x190/0x430
[ 1738.893078] ? clean_buffers+0x70/0x70
[ 1738.893085] ? udf_block_map+0xf0/0xf0 [udf]
[ 1738.893099] mpage_writepages+0x77/0x100
[ 1738.893104] ? udf_block_map+0xf0/0xf0 [udf]
[ 1738.893114] ? udf_time_to_disk_stamp+0x52/0x140 [udf]
[ 1738.893129] udf_writepages+0x15/0x20 [udf]
[ 1738.893140] do_writepages+0x43/0xd0
[ 1738.893147] ? udf_update_inode+0x36f/0x830 [udf]
[ 1738.893158] __writeback_single_inode+0x44/0x2b0
[ 1738.893165] writeback_sb_inodes+0x22d/0x4c0
[ 1738.893173] __writeback_inodes_wb+0x56/0xf0
[ 1738.893179] wb_writeback+0x1ea/0x2a0
[ 1738.893186] wb_workfn+0x31b/0x490
[ 1738.893193] ? __update_idle_core+0x9b/0xb0
[ 1738.893201] process_one_work+0x220/0x3c0
[ 1738.893207] worker_thread+0x4d/0x3f0
[ 1738.893212] ? process_one_work+0x3c0/0x3c0
[ 1738.893217] kthread+0x12b/0x150
[ 1738.893224] ? set_kthread_struct+0x40/0x40
[ 1738.893231] ret_from_fork+0x1f/0x30
[ 1738.893242] Modules linked in: udf crc_itu_t pktcdvd usb_storage hid_generic hidp hid ccm vhost_vsock vmw_vsock_virtio_transport_common vhost vhost_iotlb vsock rfcomm cmac algif_hash algif_skcipher af_alg vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) bnep binfmt_misc snd_hda_codec_hdmi snd_sof_pci snd_sof_intel_hda_common snd_sof_intel_hda snd_hda_codec_realtek snd_sof_intel_byt snd_sof_intel_ipc snd_hda_codec_generic snd_sof snd_sof_xtensa_dsp snd_soc_hdac_hda snd_hda_ext_core snd_soc_acpi_intel_match snd_soc_acpi ledtrig_audio snd_hda_intel snd_intel_dspcfg soundwire_intel soundwire_generic_allocation soundwire_cadence snd_hda_codec snd_hda_core snd_hwdep soundwire_bus snd_soc_core snd_compress ac97_bus snd_pcm_dmaengine snd_pcm snd_seq_midi snd_seq_midi_event intel_rapl_msr mei_hdcp snd_rawmidi nls_iso8859_1 intel_rapl_common x86_pkg_temp_thermal intel_powerclamp iwlmvm coretemp snd_seq snd_seq_device uvcvideo kvm_intel mac80211 videobuf2_vmalloc btusb videobuf2_memops kvm btrtl btbcm
[ 1738.893354] videobuf2_v4l2 btintel libarc4 snd_timer videobuf2_common rapl intel_cstate bluetooth input_leds videodev snd joydev iwlwifi serio_raw mc efi_pstore cfg80211 intel_wmi_thunderbolt ecdh_generic ecc soundcore mei_me intel_pch_thermal mei intel_hid sparse_keymap acpi_pad mac_hid nf_log_ipv6 ip6t_REJECT nf_reject_ipv6 xt_hl ip6t_rt nf_log_ipv4 nf_log_common ipt_REJECT nf_reject_ipv4 xt_LOG xt_comment xt_recent xt_multiport xt_limit xt_addrtype xt_tcpudp xt_conntrack sch_fq_codel nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 msr ip6table_filter ip6_tables parport_pc ppdev iptable_filter lp bpfilter parport ip_tables x_tables autofs4 btrfs blake2b_generic xor raid6_pq libcrc32c i915 rtsx_pci_sdmmc i2c_algo_bit drm_kms_helper crct10dif_pclmul crc32_pclmul ghash_clmulni_intel syscopyarea sysfillrect sysimgblt aesni_intel fb_sys_fops cec rc_core crypto_simd cryptd glue_helper rtsx_pci drm i2c_i801 r8169 nvme xhci_pci ahci psmouse nvme_core thunderbolt i2c_smbus realtek libahci
[ 1738.893491] xhci_pci_renesas wmi video
[ 1738.893502] ---[ end trace e573976dd1a434bb ]---
[ 1739.697063] RIP: 0010:pkt_submit_bio+0x39d/0x4b0 [pktcdvd]
[ 1739.697073] Code: 41 3b 45 40 7c 0b 41 83 7d 44 01 0f 84 cd 00 00 00 4c 89 ff c6 07 00 0f 1f 40 00 4c 89 e7 c6 07 00 0f 1f 40 00 e9 08 ff ff ff <0f> 0b 0f 0b 4c 89 c8 31 c9 e9 96 fe ff ff 48 c7 c2 e0 17 44 c1 be
[ 1739.697075] RSP: 0018:ffffb84c43bd3728 EFLAGS: 00010283
[ 1739.697078] RAX: 00000000000017a8 RBX: ffff97508f66f800 RCX: 00000000000017a7
[ 1739.697079] RDX: 0000000000001980 RSI: 00000000000017c0 RDI: 0000000000000040
[ 1739.697080] RBP: ffffb84c43bd37a0 R08: 0000000000000200 R09: ffffffffffffffc0
[ 1739.697082] R10: 0000000000001780 R11: 0000000000000000 R12: ffff974fd2412800
[ 1739.697083] R13: 00000000ffffffff R14: ffff97513f5f2800 R15: ffff9751584f9f50
[ 1739.697084] FS: 0000000000000000(0000) GS:ffff975330600000(0000) knlGS:0000000000000000
[ 1739.697086] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1739.697087] CR2: 00000000039f9000 CR3: 0000000188e7e001 CR4: 00000000003726f0

At this point the system appears to be working, but it cannot do a clean shut down and must be power cycled.

There may be a (partial) responsibility from the filesystem created by the udftoos or the media (I have crossposted pali at https://github.com/pali/udftools via the bug tracker for an opinion). Still the kernel should definitely not bug out in this way.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-generic-hwe-20.04 5.11.0.41.45~20.04.19
ProcVersionSignature: Ubuntu 5.11.0-41.45~20.04.1-generic 5.11.22
Uname: Linux 5.11.0-41-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Fri Dec 3 15:01:00 2021
EcryptfsInUse: Yes
InstallationDate: Installed on 2020-02-16 (656 days ago)
InstallationMedia: Kubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
SourcePackage: linux-meta-hwe-5.11
UpgradeStatus: Upgraded to focal on 2020-05-23 (559 days ago)