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I am Chaitanya from the linux graphics team in Int= el. =20 This mail is regarding a regression we are seeing in our CI runs[1] on linu= x-next repository. =20 On next-20230720 [2], we are seeing the following error <4>[ 76.189375] Hardware name: Intel Corporation Meteor Lake Client Platf= orm/MTL-P DDR5 SODIMM SBS RVP, BIOS MTLPFWI1.R00.3271.D81.2307101805 07/10/= 2023 <4>[ 76.202534] RIP: 0010:__mmu_notifier_register+0x40/0x210 <4>[ 76.207804] Code: 1a 71 5a 01 85 c0 0f 85 ec 00 00 00 48 8b 85 30 01 = 00 00 48 85 c0 0f 84 04 01 00 00 8b 85 cc 00 00 00 85 c0 0f 8e bb 01 00 00 = <49> 8b 44 24 10 48 83 78 38 00 74 1a 48 83 78 28 00 74 0c 0f 0b b8 <4>[ 76.226368] RSP: 0018:ffffc900019d7ca8 EFLAGS: 00010202 <4>[ 76.231549] RAX: 0000000000000001 RBX: 0000000000001000 RCX: 00000000= 00000001 <4>[ 76.238613] RDX: 0000000000000000 RSI: ffffffff823ceb7b RDI: ffffffff= 823ee12d <4>[ 76.245680] RBP: ffff888102ec9b40 R08: 00000000ffffffff R09: 00000000= 00000001 <4>[ 76.252747] R10: 0000000000000001 R11: ffff8881157cd2c0 R12: 00000000= 00000000 <4>[ 76.259811] R13: ffff888102ec9c70 R14: ffffffffa07de500 R15: ffff8881= 02ec9ce0 <4>[ 76.266875] FS: 00007fbcabe11c00(0000) GS:ffff88846ec00000(0000) knl= GS:0000000000000000 <4>[ 76.274884] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 <4>[ 76.280578] CR2: 0000000000000010 CR3: 000000010d4c2005 CR4: 00000000= 00f70ee0 <4>[ 76.287643] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 00000000= 00000000 <4>[ 76.294711] DR3: 0000000000000000 DR6: 00000000ffff07f0 DR7: 00000000= 00000400 <4>[ 76.301775] PKRU: 55555554 <4>[ 76.304463] Call Trace: <4>[ 76.306893] <4>[ 76.308983] ? __die_body+0x1a/0x60 <4>[ 76.312444] ? page_fault_oops+0x156/0x450 <4>[ 76.316510] ? do_user_addr_fault+0x65/0x980 <4>[ 76.320747] ? exc_page_fault+0x68/0x1a0 <4>[ 76.324643] ? asm_exc_page_fault+0x26/0x30 <4>[ 76.328796] ? __mmu_notifier_register+0x40/0x210 <4>[ 76.333460] ? __mmu_notifier_register+0x11c/0x210 <4>[ 76.338206] ? preempt_count_add+0x4c/0xa0 <4>[ 76.342273] mmu_notifier_register+0x30/0xe0 <4>[ 76.346509] mmu_interval_notifier_insert+0x74/0xb0 <4>[ 76.351344] i915_gem_userptr_ioctl+0x21a/0x320 [i915] <4>[ 76.356565] ? __pfx_i915_gem_userptr_ioctl+0x10/0x10 [i915] <4>[ 76.362271] drm_ioctl_kernel+0xb4/0x150 <4>[ 76.366159] drm_ioctl+0x21d/0x420 <4>[ 76.369537] ? __pfx_i915_gem_userptr_ioctl+0x10/0x10 [i915] <4>[ 76.375242] ? find_held_lock+0x2b/0x80 <4>[ 76.379046] __x64_sys_ioctl+0x79/0xb0 <4>[ 76.382766] do_syscall_64+0x3c/0x90 <4>[ 76.386312] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 <4>[ 76.391317] RIP: 0033:0x7fbcae63f3ab Details log can be found in [3]. After bisecting the tree, the following patch seems to be causing the regression. commit 828fe4085cae77acb3abf7dd3d25b3ed6c560edf Author: Alistair Popple apopple@nvidia.com Date: Wed Jul 19 22:18:46 2023 +1000 mmu_notifiers: rename invalidate_range notifier There are two main use cases for mmu notifiers. One is by KVM which us= es mmu_notifier_invalidate_range_start()/end() to manage a software TLB. The other is to manage hardware TLBs which need to use the invalidate_range() callback because HW can establish new TLB entries at any time. Hence using start/end() can lead to memory corruption as the= se callbacks happen too soon/late during page unmap. mmu notifier users should therefore either use the start()/end() callba= cks or the invalidate_range() callbacks. To make this usage clearer rename the invalidate_range() callback to arch_invalidate_secondary_tlbs() and update documention. Link: https://lkml.kernel.org/r/9a02dde2f8ddaad2db31e54706a80c12d1817aa= f.1689768831.git-series.apopple@nvidia.com We also verified by reverting the patch in the tree. Could you please check why this patch causes the regression and if we can f= ind a solution for it soon? [1] https://intel-gfx-ci.01.org/tree/linux-next/combined-alt.html? [2] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/com= mit/?h=3Dnext-20230720=20 [3] https://intel-gfx-ci.01.org/tree/linux-next/next-20230720/bat-mtlp-6/dm= esg0.txt