For what it is worth, I have a kernel issue that appears after upgrading from
4.15.0-88 to 4.15.0-91 and it still is present in 4.15.0-96.
For my system the kernel does not panic, however it eventually starts erroring
and then mounts /tmp as ro.
If I reboot in maintenance mode fsck the disk, fix errors and reboot, system
will repeat. However, booting back to 4.15.0-88 and system will come back up
and remain stable.
Once booting with kernal 4.15.0-91 or 4.15.0-96, syslog shows
Apr 12 00:06:00 Brushpass kernel: [34615.321379] sd 0:0:0:0: [sda] tag#1 Sense
Key : Medium Error [current]
Apr 12 00:06:00 Brushpass kernel: [34615.321383] sd 0:0:0:0: [sda] tag#1 Add.
Sense: Unrecovered read error - auto reallocate failed
Apr 12 00:06:00 Brushpass kernel: [34615.321386] sd 0:0:0:0: [sda] tag#1 CDB:
Read(10) 28 00 00 04 28 90 00 00 d0 00
Apr 12 00:06:00 Brushpass kernel: [34615.321389] print_req_error: I/O error,
dev sda, sector 272728
Apr 12 00:06:00 Brushpass kernel: [34615.321427] ata1: EH complete
Apr 12 00:06:03 Brushpass kernel: [34618.285416] ata1.00: exception Emask 0x0
SAct 0x6000 SErr 0x0 action 0x0
Apr 12 00:06:03 Brushpass kernel: [34618.285426] ata1.00: irq_stat 0x40000001
Apr 12 00:06:03 Brushpass kernel: [34618.285433] ata1.00: failed command: READ
FPDMA QUEUED
Apr 12 00:06:03 Brushpass kernel: [34618.285445] ata1.00: cmd
60/08:68:58:29:04/00:00:00:00:00/40 tag 13 ncq dma 4096 in
Apr 12 00:06:03 Brushpass kernel: [34618.285445] res
41/40:08:58:29:04/00:00:00:00:00/40 Emask 0x409 (media error) <F>
Apr 12 00:06:03 Brushpass kernel: [34618.285451] ata1.00: status: { DRDY ERR }
Apr 12 00:06:03 Brushpass kernel: [34618.285455] ata1.00: error: { UNC }
Apr 12 00:06:03 Brushpass kernel: [34618.285459] ata1.00: failed command: WRITE
FPDMA QUEUED
Apr 12 00:06:03 Brushpass kernel: [34618.285469] ata1.00: cmd
61/48:70:c0:88:86/01:00:1c:00:00/40 tag 14 ncq dma 167936 out
Apr 12 00:06:03 Brushpass kernel: [34618.285469] res
41/40:70:58:29:04/00:00:00:00:00/40 Emask 0x9 (media error)
Apr 12 00:06:03 Brushpass kernel: [34618.285474] ata1.00: status: { DRDY ERR }
Apr 12 00:06:03 Brushpass kernel: [34618.285477] ata1.00: error: { UNC }
Apr 12 00:06:03 Brushpass kernel: [34618.288690] ata1.00: configured for
UDMA/100
Apr 12 00:06:03 Brushpass kernel: [34618.288737] sd 0:0:0:0: [sda] tag#13
FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Apr 12 00:06:03 Brushpass kernel: [34618.288750] sd 0:0:0:0: [sda] tag#13 Sense
Key : Medium Error [current]
Apr 12 00:06:03 Brushpass kernel: [34618.288760] sd 0:0:0:0: [sda] tag#13 Add.
Sense: Unrecovered read error - auto reallocate failed
Not sure if this will help.\
-mike
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https://bugs.launchpad.net/bugs/1867916
Title:
Regression in kernel 4.15.0-91 causes kernel panic with Bcache
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