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Message-ID: <BYAPR21MB1270A0B5CEDBA1C0D2E290EBBF3B9@BYAPR21MB1270.namprd21.prod.outlook.com>
Date: Fri, 4 Jun 2021 18:37:49 +0000
From: Dexuan Cui <decui@...rosoft.com>
To: 'Matthew Wilcox' <willy@...radead.org>,
'Wei Liu' <wei.liu@...nel.org>, vkuznets <vkuznets@...hat.com>,
'Vineeth Pillai' <viremana@...ux.microsoft.com>
CC: "'dri-devel@...ts.freedesktop.org'" <dri-devel@...ts.freedesktop.org>,
"'linux-hyperv@...r.kernel.org'" <linux-hyperv@...r.kernel.org>,
"'linux-fbdev@...r.kernel.org'" <linux-fbdev@...r.kernel.org>,
"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
Michael Kelley <mikelley@...rosoft.com>
Subject: RE: [bug report] Commit ccf953d8f3d6 ("fb_defio: Remove custom
address_space_operations") breaks Hyper-V FB driver
> From: Dexuan Cui
> Sent: Friday, June 4, 2021 11:17 AM
> > >> ...
> > > I've heard a similar report from Vineeth but we didn't get to the bottom
> > > of this.
> > I have just tried reverting the commit mentioned above and it solves the
> > GUI freeze
> > I was also seeing. Previously, login screen was just freezing, but VM
> > was accessible
> > through ssh. With the above commit reverted, I can login to Gnome.
> >
> > Looks like I am also experiencing the same bug mentioned here.
> >
> > Thanks,
> > Vineeth
>
> As Matthew mentioned, this is a known issue:
> https://lwn.net/ml/linux-kernel/YLZEhv0cpZp8uVE3@casper.infradead.org/
>
> Matthew has reverted ccf953d8f3d6:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=
> 0b78f8bcf4951af30b0ae83ea4fad27d641ab617
> so the latest mainline should work now.
>
> Thanks,
> Dexuan
Hi Matthew,
With today's latest mainline 16f0596fc1d78a1f3ae4628cff962bb297dc908c,
the Xorg works again in Linux VM on Hyper-V, but when I reboot the VM, I
always see a lot of "BUG: Bad page state in process Xorg " warnings (there
are about 60 such warnings) before the VM reboots.
BTW, I happen to have an older Mar-28 mainline kernel (36a14638f7c0654),
which has the same warnings.
Any idea which change introduced the warnings?
[ 87.446129] BUG: Bad page state in process Xorg pfn:151807
[ 87.448238] page:000000004f982270 refcount:0 mapcount:0 mapping:00000000dcf68290 index:0x0 pfn:0x151807
[ 87.455506] aops:fb_deferred_io_aops ino:f9 dentry name:"fb0"
[ 87.455506] flags: 0x57fffc000000000(node=1|zone=2|lastcpupid=0x1ffff)
[ 87.455506] raw: 057fffc000000000 dead000000000100 dead000000000122 ffff9fa811c4a280
[ 87.455506] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 87.455506] page dumped because: non-NULL mapping
[ 87.487491] Modules linked in: ...
[ 87.491504] CPU: 6 PID: 1388 Comm: Xorg Tainted: G E 5.13.0-rc4+ #1
[ 87.533204] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090008 12/07/2018
[ 87.533204] Call Trace:
[ 87.533204] dump_stack+0x64/0x7c
[ 87.533204] bad_page.cold.118+0x63/0x93
[ OK 87.533204] free_pcppages_bulk+0x1ac/0x770
0m] Stopped Crea[ 87.533204] free_unref_page_list+0x101/0x180
te final runtime[ 87.533204] release_pages+0x186/0x4c0
[ 87.533204] tlb_flush_mmu+0x44/0x120
dir for shutdow[ 87.533204] tlb_finish_mmu+0x3c/0x70
n pivot root.
[ 87.533204] unmap_region+0xd1/0x110
[ 87.533204] __do_munmap+0x2a2/0x500
[ 87.533204] __vm_munmap+0x7d/0x130
[ 87.533204] __x64_sys_munmap+0x27/0x30
[ 87.533204] do_syscall_64+0x3c/0xb0
[ 87.533204] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 87.533204] RIP: 0033:0x7f22b49a7567
[ 87.533204] Code: 10 e9 67 ff ff ff 0f 1f 44 00 00 48 8b 15 21 ...
[ 87.533204] RSP: 002b:00007ffd56c4f2b8 EFLAGS: 00000206 ORIG_RAX: 000000000000000b
[ 87.533204] RAX: ffffffffffffffda RBX: 0000557f7299e200 RCX: 00007f22b49a7567
[ 87.533204] RDX: 0000000000000000 RSI: 0000000000400000 RDI: 00007f22b3652000
[ 87.533204] RBP: 0000557f7299edf0 R08: 0000557f729abfc0 R09: 0000000000000005
[ 87.533204] R10: 0000000000000034 R11: 0000000000000206 R12: 0000557f7299edf0
[ 87.533204] R13: 0000000000000000 R14: 0000557f71cf6968 R15: 0000557f71cdbe10
[ 87.533204] Disabling lock debugging due to kernel taint
[ 87.533204] BUG: Bad page state in process Xorg pfn:151806
[ 87.533204] page:00000000cf964098 refcount:0 mapcount:0 mapping:00000000dcf68290 index:0x0 pfn:0x151806
[ 87.533204] aops:fb_deferred_io_aops ino:f9 dentry name:"fb0"
[ 87.533204] flags: 0x57fffc000000000(node=1|zone=2|lastcpupid=0x1ffff)
[ 87.533204] raw: 057fffc000000000 dead000000000100 dead000000000122 ffff9fa811c4a280
[ 87.533204] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 87.533204] page dumped because: non-NULL mapping
[ 87.533204] Modules linked in: ...
[ 87.533204] CPU: 6 PID: 1388 Comm: Xorg Tainted: G B E 5.13.0-rc4+ #1
[ 87.533204] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090008 12/07/2018
[ 87.747523] Call Trace:
[ 87.747523] dump_stack+0x64/0x7c
[ 87.747523] bad_page.cold.118+0x63/0x93
[ 87.747523] free_pcppages_bulk+0x1ac/0x770
[ 87.747523] free_unref_page_list+0x101/0x180
[ 87.747523] release_pages+0x186/0x4c0
[ 87.747523] tlb_flush_mmu+0x44/0x120
[ 87.747523] tlb_finish_mmu+0x3c/0x70
[ 87.747523] unmap_region+0xd1/0x110
[ 87.747523] __do_munmap+0x2a2/0x500
[ 87.747523] __vm_munmap+0x7d/0x130
[ 87.747523] __x64_sys_munmap+0x27/0x30
[ 87.747523] do_syscall_64+0x3c/0xb0
[ 87.747523] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 87.747523] RIP: 0033:0x7f22b49a7567
[ 87.747523] Code: 10 e9 67 ff ff ff 0f 1f 44 00 00 48 8b 15 21 ...
[ 87.747523] RSP: 002b:00007ffd56c4f2b8 EFLAGS: 00000206 ORIG_RAX: 000000000000000b
[ 87.747523] RAX: ffffffffffffffda RBX: 0000557f7299e200 RCX: 00007f22b49a7567
[ 87.747523] RDX: 0000000000000000 RSI: 0000000000400000 RDI: 00007f22b3652000
[ 87.747523] RBP: 0000557f7299edf0 R08: 0000557f729abfc0 R09: 0000000000000005
[ 87.747523] R10: 0000000000000034 R11: 0000000000000206 R12: 0000557f7299edf0
[ 87.747523] R13: 0000000000000000 R14: 0000557f71cf6968 R15: 0000557f71cdbe10
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