Comment 7 for bug 1876645

I can reproduce this issue on Focal (5.4.0-30-generic) AMD64 KVM as well with the ubuntu_docker_smoke_test:

 4331.987024] general protection fault: 0000 [#1] SMP PTI
[ 4331.989188] CPU: 0 PID: 34912 Comm: dockerd Not tainted 5.4.0-30-generic #34-Ubuntu
[ 4331.992158] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014
[ 4331.995189] RIP: 0010:ovl_open_realfile+0x4a/0x150 [overlay]
[ 4331.997100] Code: 44 8b 6f 40 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 49 8b 7e 28 41 81 cd 00 00 04 04 e8 9d d4 ff ff 49 89 c7 48 8b 45 c8 <48> 8b 40 68 48 81 78 60 62 6a 65 6a 0f 84 a6 00 00 00 65 48 8b 04
[ 4332.003304] RSP: 0018:ffffb10b00b33c08 EFLAGS: 00010202
[ 4332.004841] RAX: 5ebabec054698800 RBX: ffff8ed6b776a770 RCX: 0000000000000001
[ 4332.006838] RDX: ffff8ed6b774bf00 RSI: ffff8ed6b776a770 RDI: ffff8ed6affea3c0
[ 4332.008842] RBP: ffffb10b00b33c50 R08: ffff8ed6afc79600 R09: 0000000000000000
[ 4332.010862] R10: ffff8ed6b774bf00 R11: 0000000000000000 R12: ffff8ed6b0a06c00
[ 4332.013003] R13: 0000000004048001 R14: ffff8ed6b75b6b20 R15: ffff8ed6afc79600
[ 4332.015049] FS: 00007f3a38941700(0000) GS:ffff8ed6bba00000(0000) knlGS:0000000000000000
[ 4332.017326] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 4332.019058] CR2: 000056296e62b358 CR3: 0000000130f94000 CR4: 00000000000006f0
[ 4332.021028] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 4332.023134] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 4332.025142] Call Trace:
[ 4332.025885] ? ovl_llseek+0x120/0x120 [overlay]
[ 4332.027239] ovl_open+0x57/0x90 [overlay]
[ 4332.028391] do_dentry_open+0x143/0x3a0
[ 4332.029490] vfs_open+0x2d/0x30
[ 4332.030422] do_last+0x194/0x900
[ 4332.031407] path_openat+0x8d/0x290
[ 4332.033084] ? __switch_to_asm+0x40/0x70
[ 4332.035151] ? __switch_to_asm+0x34/0x70
[ 4332.037142] do_filp_open+0x91/0x100
[ 4332.039032] ? __alloc_fd+0x46/0x150
[ 4332.040860] do_sys_open+0x17e/0x290
[ 4332.042954] __x64_sys_openat+0x20/0x30
[ 4332.044980] do_syscall_64+0x57/0x190
[ 4332.047058] entry_SYSCALL_64_after_hwframe+0x44/0xa9