Message-ID: <YZYc6uSpp76Sz4vO@kroah.com>
Date:   Thu, 18 Nov 2021 10:29:14 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Thorsten Leemhuis <linux@...mhuis.info>
Cc:     Chris Rankin <rankincj@...il.com>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>
Subject: Re: [OOPS] Linux 5.14.19 crashes and burns!

On Thu, Nov 18, 2021 at 10:15:23AM +0100, Thorsten Leemhuis wrote:
> 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?

I will push out a new 5.14 release in a few hours with those commits
reverted, as yes, you are right, they should not be there if I have
dropped them from 5.15.y

thanks,

greg k-h

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