Re: bcache kernel panic

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On Thu, 16 Feb 2023, Stefan Boehringer wrote:

> Dear Mathias,
> 
> thank you for the update. I look forward to the update. For me, it is a 
> hard crash as the screen goes green and I cannot input anything anymore. 
> I still hear hard-drive activity, so the system seems to be still up 
> (maybe usable via ssh, but haven't tried). I have to perform a hard 
> reset.

You might setup `netconsole` or a serial console to get the kernel's 
backtrace the moment it does a green screen.  For example:
  https://wiki.ubuntu.com/Kernel/Netconsole

Maybe that will provide more info.

--
Eric Wheeler



> 
> I have not experienced any data loss.
> 
> Thank you, best,
> 
>     Stefan
> 
> On 2/16/23 19:00, Matthias Ferdinand wrote:
> > Hi,
> >
> > there has been a thread referencing "field-spanning writes" recently:
> >
> >      https://www.spinics.net/lists/linux-bcache/msg11631.html
> >
> > I understood this to be some kind of false positive, to be fixed in some
> > later relase of 6.1.x kernels.
> >
> > Does the system become unusable or is this green-screen just a warning?
> >
> > Regards
> > Matthias Ferdinand
> >
> >
> > On Thu, Feb 16, 2023 at 05:58:15PM +0100, Stefan Boehringer wrote:
> >> Dear bache maintainer,
> >>
> >> I would like to report a kernel panic for bcache that is unfortunately not
> >> reproducible. I get this error roughly once a week, resulting in a green
> >> screen on my system. Please let me know, if I can provide further
> >> information to fix the bug. Below dmesg output copy-pasted as instructed.
> >>
> >> Thank you, best,
> >>
> >>      Stefan
> >>
> >>
> >> Feb 15 08:44:49.840548 myhost kernel: ------------[ cut here ]------------
> >>
> >> Feb 15 08:44:49.840614 myhost kernel: memcpy: detected field-spanning write
> >> (size 264) of single field "&i
> >> ->j" at drivers/md/bcache/journal.c:152 (size 240)
> >> Feb 15 08:44:49.840633 myhost kernel: WARNING: CPU: 7 PID: 755 at
> >> drivers/md/bcache/journal.c:152 journal_
> >> read_bucket+0x3df/0x490 [bcache]
> >> Feb 15 08:44:49.840649 myhost kernel: Modules linked in: snd_hwdep(+)
> >> kvm(+)
> >> snd_pcm videobuf2_vmalloc(+)
> >> videobuf2_memops snd_timer videobuf2_v4l2 sr_mod(+) snd real
> >> tek cdrom pcspkr efi_pstore k10temp videobuf2_common i2c_piix4
> >> hid_plantronics(+) irqbypass pcc_cpufreq(-) mdio_devres joydev soundcore
> >> cfg80211 libphy bcache tiny_power_button acpi_cpufreq button fuse configfs
> >> dmi_sysfs ip_tables x_tables btusb btrtl btbcm btintel btmtk bluetooth
> >> hid_generic uas ecdh_generic usbhid usb_storage rfkill amdgpu
> >> crct10dif_pclmul crc32_pclmul polyval_clmulni polyval_generic gf128mul
> >> drm_ttm_helper ttm ghash_clmulni_intel iommu_v2 xhci_pci gpu_sched
> >> sha512_ssse3 xhci_pci_renesas xhci_hcd drm_buddy aesni_intel
> >> drm_display_helper nvme crypto_simd usbcore cryptd cec ccp nvme_core
> >> sp5100_tco rc_core amd_sfh video wmi btrfs blake2b_generic libcrc32c
> >> crc32c_intel xor raid6_pq v4l2loopback(O) videodev mc sg dm_multipath
> >> dm_mod
> >> scsi_dh_rdac scsi_dh_emc scsi_dh_alua msr efivarfs
> >> Feb 15 08:44:49.840786 myhost kernel: CPU: 7 PID: 755 Comm: kworker/7:2
> >> Tainted: G           O       6.1.10-1-default #1 openSUSE Tumbleweed
> >> 22576c8b47239465c1855ce27337697dac36c24c
> >> Feb 15 08:44:49.840809 myhost kernel: Hardware name: GIGABYTE
> >> GB-BRR7H-4800/GB-BRR7H-4800, BIOS F5 05/05/2021
> >> Feb 15 08:44:49.840827 myhost kernel: Workqueue: events
> >> register_cache_worker [bcache]
> >> Feb 15 08:44:49.840844 myhost kernel: RIP:
> >> 0010:journal_read_bucket+0x3df/0x490 [bcache]
> >> Feb 15 08:44:49.840860 myhost kernel: Code: 00 00 00 48 89 ee 48 c7 c2 70
> >> c4
> >> cb c0 48 c7 c7 a8 c4 cb c0 4c 89 5c 24 48 48 89 44 24 20 c6 05 21 c8 02 00
> >> 01 e8 3e f5 65 f1 <0f> 0b 4c 8b 5c 24 48 48 8b 44 24 20 e9 6b ff ff ff 44
> >> 8b
> >> 74 24 54
> >> Feb 15 08:44:49.840884 myhost kernel: RSP: 0018:ffffb6fe01893c98 EFLAGS:
> >> 00010282
> >> Feb 15 08:44:49.840900 myhost kernel: RAX: 0000000000000000 RBX:
> >> ffff95ebc2a3c000 RCX: 0000000000000027
> >> Feb 15 08:44:49.840915 myhost kernel: RDX: ffff95f2af7e24e8 RSI:
> >> 0000000000000001 RDI: ffff95f2af7e24e0
> >> Feb 15 08:44:49.840932 myhost kernel: RBP: 0000000000000108 R08:
> >> 0000000000000000 R09: ffffb6fe01893b40
> >> Feb 15 08:44:49.840948 myhost kernel: R10: 0000000000000003 R11:
> >> ffff95f2cf2ff228 R12: dead000000000122
> >> Feb 15 08:44:49.840965 myhost kernel: R13: dead000000000100 R14:
> >> ffff95ebc46a8400 R15: ffffb6fe01893e08
> >> Feb 15 08:44:49.840981 myhost kernel: FS:  0000000000000000(0000)
> >> GS:ffff95f2af7c0000(0000) knlGS:0000000000000000
> >> Feb 15 08:44:49.840998 myhost kernel: CS:  0010 DS: 0000 ES: 0000 CR0:
> >> 0000000080050033
> >> Feb 15 08:44:49.841014 myhost kernel: CR2: 00007f166249afe0 CR3:
> >> 000000010323e000 CR4: 0000000000350ee0
> >> Feb 15 08:44:49.841030 myhost kernel: Call Trace:
> >> Feb 15 08:44:49.841047 myhost kernel:  <TASK>
> >> Feb 15 08:44:49.841067 myhost kernel:  ? bch_btree_exit+0x20/0x20 [bcache
> >> f7676faef63111511583961fa9b18ec07deb88c4]
> >> Feb 15 08:44:49.841090 myhost kernel:  bch_journal_read+0x79/0x320 [bcache
> >> f7676faef63111511583961fa9b18ec07deb88c4]
> >> Feb 15 08:44:49.841108 myhost kernel: register_cache_worker+0x99f/0x11c0
> >> [bcache f7676faef63111511583961fa9b18ec07deb88c4]
> >> Feb 15 08:44:49.841125 myhost kernel:  ?
> >> finish_task_switch.isra.0+0x90/0x2d0
> >> Feb 15 08:44:49.841141 myhost kernel:  process_one_work+0x20c/0x3d0
> >> Feb 15 08:44:49.841157 myhost kernel:  worker_thread+0x4a/0x3b0
> >> Feb 15 08:44:49.841173 myhost kernel:  ? process_one_work+0x3d0/0x3d0
> >> Feb 15 08:44:49.841188 myhost kernel:  kthread+0xd7/0x100
> >> Feb 15 08:44:49.841203 myhost kernel:  ?
> >> kthread_complete_and_exit+0x20/0x20
> >> Feb 15 08:44:49.841219 myhost kernel:  ret_from_fork+0x1f/0x30
> >> Feb 15 08:44:49.841236 myhost kernel:  </TASK>
> >> Feb 15 08:44:49.841251 myhost kernel: ---[ end trace 0000000000000000 ]---
> >> Feb 15 08:44:49.848553 myhost kernel: sr 1:0:0:0: [sr0] scsi3-mmc drive:
> >> 24x/24x writer dvd-ram cd/rw xa/form2 cdda tray
> >> Feb 15 08:44:49.848843 myhost kernel: cdrom: Uniform CD-ROM driver
> >> Revision:
> >> 3.20
> >> Feb 15 08:44:49.872544 myhost kernel: plantronics 0003:047F:1200.0004:
> >> input,hiddev96,hidraw3: USB HID v1.11 Device [Plantronics Plantronics
> >> Calisto 7200] on usb-0000:04:00.0-2.4/input3
> >> Feb 15 08:44:49.876547 myhost kernel: sr 1:0:0:0: Attached scsi CD-ROM sr0
> >> Feb 15 08:44:49.880540 myhost kernel: ------------[ cut here ]------------
> 
> 
> 

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