Comment 4 for bug 1876645

You can triggered a general protection fault by running the ubuntu_docker_smoke_test, the test passed with older Eoan kernel in -updates, but failed with this one in proposed.

[ 101.715152] general protection fault: 0000 [#1] SMP PTI
[ 101.717403] CPU: 1 PID: 1236 Comm: dockerd Not tainted 5.3.0-52-generic #46-Ubuntu
[ 101.720424] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014
[ 101.723856] RIP: 0010:ovl_open_realfile+0x4a/0x150 [overlay]
[ 101.725826] 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 cd 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
[ 101.731311] RSP: 0018:ffffaa28406afc08 EFLAGS: 00010202
[ 101.732773] RAX: 044555892ac42800 RBX: ffff9af67a149ea8 RCX: 0000000000000001
[ 101.734759] RDX: 0000000000008000 RSI: ffff9af67a149ea8 RDI: ffff9af67b3d9000
[ 101.736866] RBP: ffffaa28406afc50 R08: ffff9af67b031240 R09: 0000000000000000
[ 101.738854] R10: ffff9af67a7d6900 R11: 0000000000000000 R12: ffff9af6799a1d00
[ 101.740883] R13: 0000000004048001 R14: ffff9af67a1a4818 R15: ffff9af67b031240
[ 101.742902] FS: 00007f58a57fa700(0000) GS:ffff9af67db00000(0000) knlGS:0000000000000000
[ 101.745194] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 101.746798] CR2: 0000000001178b78 CR3: 000000007b060000 CR4: 00000000000006e0
[ 101.748817] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 101.750798] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 101.752804] Call Trace:
[ 101.753502] ? ovl_llseek+0x120/0x120 [overlay]
[ 101.754770] ovl_open+0x57/0x90 [overlay]
[ 101.755951] do_dentry_open+0x143/0x3a0
[ 101.757013] vfs_open+0x2d/0x30
[ 101.757949] do_last+0x194/0x8f0
[ 101.758843] path_openat+0x8d/0x270
[ 101.759908] ? __switch_to_asm+0x40/0x70
[ 101.760984] ? __switch_to_asm+0x34/0x70
[ 101.762099] do_filp_open+0x91/0x100
[ 101.763088] ? __alloc_fd+0x46/0x150
[ 101.764171] do_sys_open+0x17e/0x290
[ 101.765168] __x64_sys_openat+0x20/0x30
[ 101.766297] do_syscall_64+0x5a/0x130
[ 101.767512] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 101.768932] RIP: 0033:0x56465af612ba
[ 101.769922] Code: e8 8b 3d f8 ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 4c 8b 54 24 28 4c 8b 44 24 30 4c 8b 4c 24 38 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 40 ff ff ff ff 48 c7 44 24 48
[ 101.775167] RSP: 002b:000000c0009567a0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
[ 101.777440] RAX: ffffffffffffffda RBX: 000000c00005e500 RCX: 000056465af612ba
[ 101.779553] RDX: 0000000000080241 RSI: 000000c000814e00 RDI: ffffffffffffff9c
[ 101.781538] RBP: 000000c000956818 R08: 0000000000000000 R09: 0000000000000000
[ 101.783650] R10: 00000000000001a4 R11: 0000000000000202 R12: ffffffffffffffff
[ 101.785789] R13: 0000000000000039 R14: 0000000000000038 R15: 0000000000000080
[ 101.787887] Modules linked in: xt_conntrack xt_MASQUERADE nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo xt_addrtype iptable_filter iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 bpfilter br_netfilter bridge stp llc aufs overlay dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua kvm_intel kvm irqbypass joydev 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 psmouse failover virtio_blk i2c_piix4 pata_acpi floppy
[ 101.808815] ---[ end trace ef14f7485e54a2a6 ]---
[ 101.811218] RIP: 0010:ovl_open_realfile+0x4a/0x150 [overlay]
[ 101.814009] 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 cd 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
[ 101.821593] RSP: 0018:ffffaa28406afc08 EFLAGS: 00010202
[ 101.823778] RAX: 044555892ac42800 RBX: ffff9af67a149ea8 RCX: 0000000000000001
[ 101.826528] RDX: 0000000000008000 RSI: ffff9af67a149ea8 RDI: ffff9af67b3d9000
[ 101.829350] RBP: ffffaa28406afc50 R08: ffff9af67b031240 R09: 0000000000000000
[ 101.831910] R10: ffff9af67a7d6900 R11: 0000000000000000 R12: ffff9af6799a1d00
[ 101.834825] R13: 0000000004048001 R14: ffff9af67a1a4818 R15: ffff9af67b031240
[ 101.837606] FS: 00007f58a57fa700(0000) GS:ffff9af67db00000(0000) knlGS:0000000000000000
[ 101.840678] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 101.842914] CR2: 0000000001178b78 CR3: 000000007b060000 CR4: 00000000000006e0
[ 101.845479] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 101.848015] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400