Comment 53 for bug 1796292

Andrea, thanks for the updated kernels.

On the first one, I got 23 installs before I ran into an issue; I'll test the newer kernel next.

https://paste.ubuntu.com/p/2B4Kk3wbvQ/

[ 5436.870482] BUG: unable to handle kernel NULL pointer dereference at 00000000000009b8
[ 5436.873374] IP: cache_set_flush+0xf6/0x190 [bcache]
[ 5436.875208] PGD 0 P4D 0
[ 5436.876488] Oops: 0000 [#1] SMP PTI
[ 5436.877842] Modules linked in: zfs(PO) zunicode(PO) zavl(PO) icp(PO) zcommon(PO) znvpair(PO) spl(O) nls_utf8 isofs ppdev nls_iso8859_1 kvm_intel kvm irqbypass joydev input_leds serio_raw parport_pc parport qemu_fw_cfg mac_hid sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi virtio_rng 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 raid0 multipath linear raid1 bcache psmouse nvme nvme_core virtio_blk virtio_net virtio_scsi floppy i2c_piix4 pata_acpi
[ 5436.896104] CPU: 0 PID: 11216 Comm: kworker/0:1 Tainted: P O 4.15.0-54-generic #58+lp1796292+1
[ 5436.899985] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015
[ 5436.902645] Workqueue: events cache_set_flush [bcache]
[ 5436.904374] RIP: 0010:cache_set_flush+0xf6/0x190 [bcache]
[ 5436.906183] RSP: 0018:ffffab52826bbe58 EFLAGS: 00010202
[ 5436.909050] RAX: 0000000000000000 RBX: ffff94d104aa0cc0 RCX: 0000000000000000
[ 5436.911939] RDX: 0000000000000000 RSI: 0000000020000001 RDI: 0000000000000000
[ 5436.914448] RBP: ffffab52826bbe78 R08: ffff94d13f61ac30 R09: ffff94d13f342b98
[ 5436.917113] R10: ffffab52803b3d10 R11: 00000000000002c6 R12: 0000000000000001
[ 5436.919210] R13: ffff94d13f622140 R14: ffff94d104aa0db8 R15: 0000000000000000
[ 5436.921401] FS: 0000000000000000(0000) GS:ffff94d13f600000(0000) knlGS:0000000000000000
[ 5436.923743] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 5436.926299] CR2: 00000000000009b8 CR3: 0000000038252000 CR4: 00000000000006f0
[ 5436.929093] Call Trace:
[ 5436.930818] process_one_work+0x1de/0x410
[ 5436.932818] worker_thread+0x32/0x410
[ 5436.935332] kthread+0x121/0x140
[ 5436.937309] ? process_one_work+0x410/0x410
[ 5436.939393] ? kthread_create_worker_on_cpu+0x70/0x70
[ 5436.941263] ret_from_fork+0x35/0x40
[ 5436.943060] Code: b8 00 00 00 a8 02 74 c8 31 f6 4c 89 e7 e8 43 0e ff ff eb bc 66 83 bb 4c f7 ff ff 00 48 8b 83 58 ff ff ff 74 31 41 bc 01 00 00 00 <48> 8b b8 b8 09 00 00 48 85 ff 74 05 e8 f9 9d 0d d3 0f b7 8b 4c
[ 5436.950188] RIP: cache_set_flush+0xf6/0x190 [bcache] RSP: ffffab52826bbe58
[ 5436.952796] CR2: 00000000000009b8
[ 5436.954567] ---[ end trace b771415397e98c3d ]---