* [bug report] Commit ccf953d8f3d6 ("fb_defio: Remove custom address_space_operations") breaks Hyper-V FB driver @ 2021-06-04 12:25 Vitaly Kuznetsov 2021-06-04 13:00 ` Wei Liu 2021-06-04 13:31 ` Matthew Wilcox 0 siblings, 2 replies; 7+ messages in thread From: Vitaly Kuznetsov @ 2021-06-04 12:25 UTC (permalink / raw) To: Matthew Wilcox, dri-devel, linux-hyperv, linux-fbdev Cc: linux-kernel, Michael Kelley, wei.liu, Dexuan Cui Hi, Commit ccf953d8f3d6 ("fb_defio: Remove custom address_space_operations") seems to be breaking Hyper-V framebuffer (drivers/video/fbdev/hyperv_fb.c) driver for me: Hyper-V guest boots well and plymouth even works but when I try starting Gnome, virtual screen just goes black. Reverting the above mentioned commit on top of 5.13-rc4 saves the day. The behavior is 100% reproducible. I'm using Gen2 guest runing on Hyper-V 2019. It was also reported that Gen1 guests are equally broken. Is this something known? -- Vitaly ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [bug report] Commit ccf953d8f3d6 ("fb_defio: Remove custom address_space_operations") breaks Hyper-V FB driver 2021-06-04 12:25 [bug report] Commit ccf953d8f3d6 ("fb_defio: Remove custom address_space_operations") breaks Hyper-V FB driver Vitaly Kuznetsov @ 2021-06-04 13:00 ` Wei Liu 2021-06-04 15:47 ` Vineeth Pillai 2021-06-04 13:31 ` Matthew Wilcox 1 sibling, 1 reply; 7+ messages in thread From: Wei Liu @ 2021-06-04 13:00 UTC (permalink / raw) To: Vitaly Kuznetsov Cc: Matthew Wilcox, dri-devel, linux-hyperv, linux-fbdev, linux-kernel, Michael Kelley, wei.liu, Dexuan Cui, viremana On Fri, Jun 04, 2021 at 02:25:01PM +0200, Vitaly Kuznetsov wrote: > Hi, > > Commit ccf953d8f3d6 ("fb_defio: Remove custom address_space_operations") > seems to be breaking Hyper-V framebuffer > (drivers/video/fbdev/hyperv_fb.c) driver for me: Hyper-V guest boots > well and plymouth even works but when I try starting Gnome, virtual > screen just goes black. Reverting the above mentioned commit on top of > 5.13-rc4 saves the day. The behavior is 100% reproducible. I'm using > Gen2 guest runing on Hyper-V 2019. It was also reported that Gen1 guests > are equally broken. > > Is this something known? > I've heard a similar report from Vineeth but we didn't get to the bottom of this. Wei. > -- > Vitaly > ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [bug report] Commit ccf953d8f3d6 ("fb_defio: Remove custom address_space_operations") breaks Hyper-V FB driver 2021-06-04 13:00 ` Wei Liu @ 2021-06-04 15:47 ` Vineeth Pillai 2021-06-04 18:16 ` Dexuan Cui 0 siblings, 1 reply; 7+ messages in thread From: Vineeth Pillai @ 2021-06-04 15:47 UTC (permalink / raw) To: Wei Liu, Vitaly Kuznetsov Cc: Matthew Wilcox, dri-devel, linux-hyperv, linux-fbdev, linux-kernel, Michael Kelley, Dexuan Cui On 6/4/2021 9:00 AM, Wei Liu wrote: > On Fri, Jun 04, 2021 at 02:25:01PM +0200, Vitaly Kuznetsov wrote: >> Hi, >> >> Commit ccf953d8f3d6 ("fb_defio: Remove custom address_space_operations") >> seems to be breaking Hyper-V framebuffer >> (drivers/video/fbdev/hyperv_fb.c) driver for me: Hyper-V guest boots >> well and plymouth even works but when I try starting Gnome, virtual >> screen just goes black. Reverting the above mentioned commit on top of >> 5.13-rc4 saves the day. The behavior is 100% reproducible. I'm using >> Gen2 guest runing on Hyper-V 2019. It was also reported that Gen1 guests >> are equally broken. >> >> Is this something known? >> > 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 ^ permalink raw reply [flat|nested] 7+ messages in thread
* RE: [bug report] Commit ccf953d8f3d6 ("fb_defio: Remove custom address_space_operations") breaks Hyper-V FB driver 2021-06-04 15:47 ` Vineeth Pillai @ 2021-06-04 18:16 ` Dexuan Cui 2021-06-04 18:37 ` Dexuan Cui 0 siblings, 1 reply; 7+ messages in thread From: Dexuan Cui @ 2021-06-04 18:16 UTC (permalink / raw) To: Vineeth Pillai, Wei Liu, vkuznets Cc: Matthew Wilcox, dri-devel, linux-hyperv, linux-fbdev, linux-kernel, Michael Kelley > From: Vineeth Pillai <viremana@linux.microsoft.com> > Sent: Friday, June 4, 2021 8:47 AM > To: Wei Liu <wei.liu@kernel.org>; vkuznets <vkuznets@redhat.com> > Cc: Matthew Wilcox <willy@infradead.org>; dri-devel@lists.freedesktop.org; > linux-hyperv@vger.kernel.org; linux-fbdev@vger.kernel.org; > linux-kernel@vger.kernel.org; Michael Kelley <mikelley@microsoft.com>; > Dexuan Cui <decui@microsoft.com> > Subject: Re: [bug report] Commit ccf953d8f3d6 ("fb_defio: Remove custom > address_space_operations") breaks Hyper-V FB driver > > > On 6/4/2021 9:00 AM, Wei Liu wrote: > > On Fri, Jun 04, 2021 at 02:25:01PM +0200, Vitaly Kuznetsov wrote: > >> Hi, > >> > >> Commit ccf953d8f3d6 ("fb_defio: Remove custom > address_space_operations") > >> seems to be breaking Hyper-V framebuffer > >> (drivers/video/fbdev/hyperv_fb.c) driver for me: Hyper-V guest boots > >> well and plymouth even works but when I try starting Gnome, virtual > >> screen just goes black. Reverting the above mentioned commit on top of > >> 5.13-rc4 saves the day. The behavior is 100% reproducible. I'm using > >> Gen2 guest runing on Hyper-V 2019. It was also reported that Gen1 guests > >> are equally broken. > >> > >> Is this something known? > >> > > 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 ^ permalink raw reply [flat|nested] 7+ messages in thread
* RE: [bug report] Commit ccf953d8f3d6 ("fb_defio: Remove custom address_space_operations") breaks Hyper-V FB driver 2021-06-04 18:16 ` Dexuan Cui @ 2021-06-04 18:37 ` Dexuan Cui 2021-06-04 18:52 ` Matthew Wilcox 0 siblings, 1 reply; 7+ messages in thread From: Dexuan Cui @ 2021-06-04 18:37 UTC (permalink / raw) To: 'Matthew Wilcox', 'Wei Liu', vkuznets, 'Vineeth Pillai' Cc: 'dri-devel@lists.freedesktop.org', 'linux-hyperv@vger.kernel.org', 'linux-fbdev@vger.kernel.org', 'linux-kernel@vger.kernel.org', Michael Kelley > 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 ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [bug report] Commit ccf953d8f3d6 ("fb_defio: Remove custom address_space_operations") breaks Hyper-V FB driver 2021-06-04 18:37 ` Dexuan Cui @ 2021-06-04 18:52 ` Matthew Wilcox 0 siblings, 0 replies; 7+ messages in thread From: Matthew Wilcox @ 2021-06-04 18:52 UTC (permalink / raw) To: Dexuan Cui Cc: 'Wei Liu', vkuznets, 'Vineeth Pillai', 'dri-devel@lists.freedesktop.org', 'linux-hyperv@vger.kernel.org', 'linux-fbdev@vger.kernel.org', 'linux-kernel@vger.kernel.org', Michael Kelley On Fri, Jun 04, 2021 at 06:37:49PM +0000, Dexuan Cui wrote: > > 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? Looks like someone forgot to call fb_deferred_io_cleanup()? ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [bug report] Commit ccf953d8f3d6 ("fb_defio: Remove custom address_space_operations") breaks Hyper-V FB driver 2021-06-04 12:25 [bug report] Commit ccf953d8f3d6 ("fb_defio: Remove custom address_space_operations") breaks Hyper-V FB driver Vitaly Kuznetsov 2021-06-04 13:00 ` Wei Liu @ 2021-06-04 13:31 ` Matthew Wilcox 1 sibling, 0 replies; 7+ messages in thread From: Matthew Wilcox @ 2021-06-04 13:31 UTC (permalink / raw) To: Vitaly Kuznetsov Cc: dri-devel, linux-hyperv, linux-fbdev, linux-kernel, Michael Kelley, wei.liu, Dexuan Cui On Fri, Jun 04, 2021 at 02:25:01PM +0200, Vitaly Kuznetsov wrote: > Commit ccf953d8f3d6 ("fb_defio: Remove custom address_space_operations") > seems to be breaking Hyper-V framebuffer https://lore.kernel.org/linux-mm/YLZUrEjVJWBGGMxf@phenom.ffwll.local/ ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2021-06-04 18:53 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2021-06-04 12:25 [bug report] Commit ccf953d8f3d6 ("fb_defio: Remove custom address_space_operations") breaks Hyper-V FB driver Vitaly Kuznetsov 2021-06-04 13:00 ` Wei Liu 2021-06-04 15:47 ` Vineeth Pillai 2021-06-04 18:16 ` Dexuan Cui 2021-06-04 18:37 ` Dexuan Cui 2021-06-04 18:52 ` Matthew Wilcox 2021-06-04 13:31 ` Matthew Wilcox
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