dmesg output on focal:
[  951.293174] LTP: starting pty03
[  951.305037] SLIP: version 0.8.4-NET3.019-NEWTTY (dynamic channels, max=256) 
(6 bit encapsulation enabled).
[  951.305038] CSLIP: code copyright 1989 Regents of the University of 
California.
[  951.305039] SLIP linefill/keepalive option.
[  951.306823] BUG: kernel NULL pointer dereference, address: 0000000000000020
[  951.309960] #PF: supervisor write access in kernel mode
[  951.312130] #PF: error_code(0x0002) - not-present page
[  951.314227] PGD 0 P4D 0 
[  951.315278] Oops: 0002 [#1] SMP PTI
[  951.316705] CPU: 1 PID: 39102 Comm: pty03 Not tainted 5.4.0-12-generic 
#15-Ubuntu
[  951.319737] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
1.10.2-1ubuntu1 04/01/2014
[  951.322713] RIP: 0010:queue_work_on+0x1b/0x50
[  951.324175] Code: 75 01 01 e8 b2 05 fe ff 0f 0b e9 c3 fc ff ff 0f 1f 44 00 
00 55 48 89 e5 53 9c 58 0f 1f 44 00 00 48 89 c3 fa 66 0f 1f 44 00 00 <f0> 48 0f 
ba 2a 00 73 13 45 31 c0 48 89 df 57 9d 0f 1f 44 00 00 44
[  951.329576] RSP: 0018:ffffab9380557cb8 EFLAGS: 00010002
[  951.331197] RAX: 0000000000000202 RBX: 0000000000000202 RCX: 0000000000000000
[  951.333358] RDX: 0000000000000020 RSI: ffff8c65fb00ae00 RDI: 0000000000002000
[  951.335566] RBP: ffffab9380557cc0 R08: 0000000000000001 R09: 0000000000000006
[  951.337743] R10: ffff8c65f8f4cb00 R11: 0000000000000000 R12: ffff8c65ea61f550
[  951.339955] R13: 0000000000000000 R14: ffff8c65eda51400 R15: ffff8c65f9002a00
[  951.342084] FS:  00007f808362a700(0000) GS:ffff8c65fbb00000(0000) 
knlGS:0000000000000000
[  951.344442] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  951.346163] CR2: 0000000000000020 CR3: 000000012a64c000 CR4: 00000000000006e0
[  951.348264] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  951.350422] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  951.352494] Call Trace:
[  951.353244]  slip_write_wakeup+0x25/0x30 [slip]
[  951.354600]  tty_wakeup+0x5b/0x70
[  951.355539]  pty_unthrottle+0x19/0x30
[  951.356560]  tty_unthrottle+0x42/0x60
[  951.357566]  __tty_perform_flush+0x87/0x90
[  951.358768]  n_tty_ioctl_helper+0xcc/0x150
[  951.359955]  n_tty_ioctl+0x2d/0x100
[  951.360930]  tty_ioctl+0x3c0/0x8e0
[  951.361882]  ? __switch_to_asm+0x34/0x70
[  951.363049]  ? __switch_to_asm+0x40/0x70
[  951.364191]  ? __switch_to_asm+0x34/0x70
[  951.365261]  ? __switch_to_asm+0x40/0x70
[  951.366382]  ? __switch_to_asm+0x34/0x70
[  951.367452]  ? __switch_to_asm+0x40/0x70
[  951.368523]  ? __switch_to_asm+0x34/0x70
[  951.369693]  ? __switch_to_asm+0x40/0x70
[  951.370829]  ? __switch_to_asm+0x34/0x70
[  951.371923]  ? __switch_to_asm+0x40/0x70
[  951.372998]  ? __switch_to_asm+0x34/0x70
[  951.374097]  ? __switch_to_asm+0x40/0x70
[  951.375183]  ? __switch_to_asm+0x34/0x70
[  951.376288]  ? __switch_to_asm+0x40/0x70
[  951.377390]  ? __switch_to+0x110/0x470
[  951.378863]  do_vfs_ioctl+0x407/0x670
[  951.380269]  ? __schedule+0x2eb/0x740
[  951.381761]  ksys_ioctl+0x67/0x90
[  951.383076]  __x64_sys_ioctl+0x1a/0x20
[  951.384510]  do_syscall_64+0x57/0x190
[  951.385896]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  951.387655] RIP: 0033:0x7f808374568b
[  951.389147] Code: 0f 1e fa 48 8b 05 05 28 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 d5 27 0d 00 f7 d8 64 89 01 48
[  951.395021] RSP: 002b:00007f8083629ec8 EFLAGS: 00000246 ORIG_RAX: 
0000000000000010
[  951.397467] RAX: ffffffffffffffda RBX: 000000000000000a RCX: 00007f808374568b
[  951.399824] RDX: 0000000000000000 RSI: 000000000000540b RDI: 0000000000000006
[  951.402105] RBP: 00005627b8f404c6 R08: 00007ffee1d0c1b0 R09: 00005627b8f4b320
[  951.404415] R10: 00005627b8f4b318 R11: 0000000000000246 R12: 0000000000000000
[  951.406754] R13: 00007ffee1c03cbf R14: 00007ffee1c03cc0 R15: 00007f8083629fc0
[  951.409192] Modules linked in: slip serport dm_multipath scsi_dh_rdac 
scsi_dh_emc scsi_dh_alua kvm_intel joydev kvm input_leds serio_raw mac_hid 
qemu_fw_cfg sch_fq_codel ip_tables x_tables autofs4 btrfs zstd_compress raid10 
raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq 
libcrc32c raid1 raid0 multipath linear cirrus drm_kms_helper syscopyarea 
sysfillrect sysimgblt fb_sys_fops drm virtio_net net_failover failover 
virtio_blk psmouse i2c_piix4 pata_acpi floppy
[  951.424165] CR2: 0000000000000020
[  951.425788] ---[ end trace 41434fc402e37fd0 ]---
[  951.427905] RIP: 0010:queue_work_on+0x1b/0x50
[  951.429933] Code: 75 01 01 e8 b2 05 fe ff 0f 0b e9 c3 fc ff ff 0f 1f 44 00 
00 55 48 89 e5 53 9c 58 0f 1f 44 00 00 48 89 c3 fa 66 0f 1f 44 00 00 <f0> 48 0f 
ba 2a 00 73 13 45 31 c0 48 89 df 57 9d 0f 1f 44 00 00 44
[  951.437519] RSP: 0018:ffffab9380557cb8 EFLAGS: 00010002
[  951.439860] RAX: 0000000000000202 RBX: 0000000000000202 RCX: 0000000000000000
[  951.442897] RDX: 0000000000000020 RSI: ffff8c65fb00ae00 RDI: 0000000000002000
[  951.445937] RBP: ffffab9380557cc0 R08: 0000000000000001 R09: 0000000000000006
[  951.449000] R10: ffff8c65f8f4cb00 R11: 0000000000000000 R12: ffff8c65ea61f550
[  951.451758] R13: 0000000000000000 R14: ffff8c65eda51400 R15: ffff8c65f9002a00
[  951.454521] FS:  00007f808362a700(0000) GS:ffff8c65fbb00000(0000) 
knlGS:0000000000000000
[  951.457385] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  951.459435] CR2: 0000000000000020 CR3: 000000012a64c000 CR4: 00000000000006e0
[  951.461819] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  951.464248] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

** Changed in: linux (Ubuntu Bionic)
       Status: New => Confirmed

** Changed in: ubuntu-kernel-tests
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1862114

Title:
  pty03 from pty in ubuntu_ltp failed on Eoan

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