reproduce method
1. On Ubuntu 20.04, install both 5.4.0-42 and 5.4.0-109 kernel
2. restart and boot into 5.4.0-42 kernel via grub menu
3. login and monitor kernel log like sudo tail -f /var/log/syslog
4. plug in sata disk, the log showed disk was dected like below:
---------------
May 4 05:51:57 rd1 kernel: [ 173.391493] ata17: SATA link up 3.0 Gbps
(SStatus 123 SControl 300)
May 4 05:51:57 rd1 kernel: [ 173.406406] ata17.00: ATA-8: WDC
WD3200BEKT-22F3T0, 11.01A11, max UDMA/133
May 4 05:51:57 rd1 kernel: [ 173.406409] ata17.00: 625142448 sectors, multi
0: LBA48 NCQ (depth 32), AA
May 4 05:51:57 rd1 kernel: [ 173.409409] ata17.00: configured for UDMA/133
May 4 05:51:57 rd1 kernel: [ 173.409606] scsi 16:0:0:0: Direct-Access ATA
WDC WD3200BEKT-2 1A11 PQ: 0 ANSI: 5
May 4 05:51:57 rd1 kernel: [ 173.409842] sd 16:0:0:0: Attached scsi generic
sg3 type 0
May 4 05:51:57 rd1 kernel: [ 173.409885] sd 16:0:0:0: [sdc] 625142448
512-byte logical blocks: (320 GB/298 GiB)
May 4 05:51:57 rd1 kernel: [ 173.409895] sd 16:0:0:0: [sdc] Write Protect is
off
May 4 05:51:57 rd1 kernel: [ 173.409897] sd 16:0:0:0: [sdc] Mode Sense: 00 3a
00 00
May 4 05:51:57 rd1 kernel: [ 173.409909] sd 16:0:0:0: [sdc] Write cache:
enabled, read cache: enabled, doesn't support DPO or FUA
May 4 05:51:57 rd1 kernel: [ 173.437156] sdc: sdc1 sdc2
May 4 05:51:57 rd1 kernel: [ 173.438248] sd 16:0:0:0: [sdc] Attached SCSI
removable disk
-------------------------
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https://bugs.launchpad.net/bugs/1971576
Title:
SATA device hot plug regression on AMD EYPC (Asus) server
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