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SubjectRe: [OOPS] Linux 5.14.19 crashes and burns!
Hey Greg!

On 18.11.21 09:57, Thorsten Leemhuis wrote:
> Lo! CCing stable and regressions list. FWIW, I have a Fedora 34 VM that
> stopped booting with 5.14.19 as well. More inline:
>
> On 18.11.21 01:55, Chris Rankin wrote:
>>
>> I have tried to boot a vanilla 5.14.19 kernel, but it crashes when
>> "switching root" away from the initramfs. ("Unable to handle page
>> fault...)
>>
>> Google's "copy text from image" feature has managed to scrape this
>> information from my phone camera:
>>
>> 1tch Noo
>> BUG: unable to handle page fault for address: ffffc980006cfeDS
>> #PF: supervisor read access in kernel mode #PF: error_code (8x8888) -
>> not-present page
>> PGD 100000067 P4D 100000067 PUD 18885e867 PMD 104486867 PTE 8
>> Oops: 0888 [#1] PREEMPT SMP PTI
>> CPU: 6 PID: 1 Comm: systemd Tainted: G Hardware name: Gigabyte
>> Technology Co., Ltd. EX58-UD3R/EX58-UD3R, BIOS FB 05/04/2009
>> 5.14.19 #1
>> RIP: 0010: __unwind_start+8xb5/8x15f
>> Code: 48 8d 8d 88 88 88 88 48 89 e2 48 89 e8 48 89 4d 48 48 89 55 38
>> 48 RSP: 0018:ffffc90088823bf0 EFLAGS: 00010006
>> RAX: ffffc900006efde8 RBX: 0000000000000000 RCX: 08 RDX:
>> ffffc900006efe18 RSI : ffff88818a9f6c80 RDI: ffffc
>> RBP: ffffc90808823c18 R08: 00000000000001de R89: R10: ffff888107d20000
>> R11: ffff888183b4ba88 R12: ffffc900006ef dell
>> R13: ffff88810a9f73bc R14: ffff888103c58480 R15: FS: 00007f528fd19b40
>> (0800) GS:ffff888343488808 (0888) knl6S:
>> CS: 0818 DS: 0000 ES: 0000 CRO: 0888000088858833
>> CR2: ffffc900006efe88 CR3: 088080818186a888 CR4: 8888
>> Call Trace:
>> <TASK>
>> get_wchan+8x42/8x8f
>> get_wchan+8x45/8x59
>> do_task_stat+0x3ab/0x38
>> proc_single_show+8x1e/8x68
>> seq_read_iter+0x151/8x342 seq_read+8xf1/8x117
>> uf's_read+Bxa3/8x183
>> ksys_read+8x71/8xb9 do_syscal1_64+8x6d/8x88
>> entry_SYSCALL_64_after_huframe+8x11/8xne
>> RIP: 8033:8x7f529884f832
>> Code: c0 e9 b2 fe ff ff 50 48 8d 3d ea 2e Bc 80 68 65 £9 01 00 0f 16 44 000
>> RSP: 082b:00087ffed3b91f18 EFLAGS: 88888246 ORIG RAX:
>> RAX: ffffffffffffffda RBX: 8888559462036658 RCX: 000071529084/83
>> RDX: 0000000000000100 RSI: 8088559462c90b78 RDI:
>> RBP: 000071529894a300 BAR:
>> te fa
>>
>> And also this:
>>
>> do_syscall_64+0x6d/0x80
>> entry_SYSCALL_64_after_huframe+0x44/0xae
>> RIP: 8033:0x7f529884f832
>> Code: c0 e9 b2 fe ff ff 50 48 8d 3d ea Ze Bc 80 e8 b5 f9 01 00 0f 1f
>> 44 00 00 f3 Bf 1e fa 64 8b 84 25 18 88 RSP: 082b:00087ffed3b91f 18
>> EFLAGS: 00000246 ORIG_RAX: 0000000000000000
>> RAX: ffffffffffffffda RBX: 0000559462c36650 RCX: 000071529084f832 RDX:
>> 0000000000000400 RSI: 0000559462c90b70 RDI: 0000000000000006
>> RBP: 000071529094a3a0 R08: 0000000000000006 RO9: 0000000000000001 R18:
>> 0000000000001000 R11: 0000000000000246 R12: 00007f528fd198f0
>> R13: 0000000000000168 R14: 00007f52909497a0 R15: 00000000000001468
>> </TASK>
>> Modules linked in: ext4 crc32c_generic crc16 mbcache jbd2 sr_mod
>> sd_mod cdrom hid_microsoft usbhid amdgpu uh ci drm_kms_helper ehci_hcd
>> cf bf illrect syscopyarea cfbimgblt sysfillrect sysimgblt xhci pci
>> xhci_hcd fb_sys_ mod usb_common drm_panel_orientation_quirks
>> ipmi_devintf ipmi_msghandler msr sha256_ssse3 sha256_generic ipu CRZ:
>> ffffc900006efe08
>> --- end trace 9771b79967a8dd89 ]--- RIP: 8010:_unwind_start+8xb5/0x15f
>> Code: 48 8d 8d 00 00 00 00 48 89 e2 48 89 e8 48 89 4d 48 48 89 55 38
>> 48 89 45 40 eb 29 48 8b 86 98 Ba 80 00 RSP: 0818:ffffc90000023bf0
>> EFLAGS: 00010006 RAX: ffffc900006efde0 RBX: 0000000000000000 RCX:
>> 0000000000000000
>> RDX: ffffc900006efe18 RSI: ffff88810a9f6c00 RDI: ffffc90000023c78 RBP:
>> ffffc98800023c18 R08: 00000000000001de R09: 00000000005b20c6
>> R10: ffff888107120000 R11: ffff888103b4ba80 R12: ffffc900006ef de
>> R13: ffff88818a9f73bc R14: ffff888103c50480 R15: 0000000000000000 FS:
>> 00007f528fd19b40(8000) GS:ffff888343180000 (0800)
>> knlGS:0000000000000000 CS: 0810 DS: 0000 ES: 0000 CRO:
>> 0000000080050033
>> CR2: ffffc908806efe88 CR3: 000000010186a000 CR4: 00000000000006e0
>> note: systemd [1] exited with preempt_count 1
>> Kernel panic - not syncing: Attempted to kill init!
>> exitcode=0x00000009 Kernel Offset: disabled
>> --- [ end Kernel panic not syncing: Attempted to kill initf
>> exitcode=0x00000009 1--- -
>>
>> I cannot capture the exact oops via any other means, although I can
>> send the original camera pictures that I captured the text from, on
>> request.
>
> By default I didn't get to see any messages,

BTW: that was a stupid error on my side, I get them now.

> the VM just hangs when
> switching to root. Did anyone else already report or even track this
> down already? Guess otherwise I need to take a closer look and maybe
> start bisecting...

On a quick looks above problems seems to be similar to the one already
reported wrt to WCHAN:
https://lore.kernel.org/stable/YZV02RCRVHIa144u@fedora64.linuxtx.org/

Greg, is there any reason why you didn't drop them from 5.14.y as well,
as you did for 5.15.y:
https://lore.kernel.org/all/YZYLC9D6zpUneYtn@kroah.com/

Should I try reverting these three and see if the situations improves?

Ciao, Thorsten

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