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Peter Anvin" , Linus Torvalds , Dave Hansen , Thomas Gleixner , Uros Bizjak , linux-kernel@vger.kernel.org, peterz@infradead.org Subject: commit 81106b7e0b13 can break asm_int80_emulation on x86_64 Date: Thu, 8 Aug 2024 03:57:50 +0200 Message-ID: <20240808015752.65088-1-spasswolf@web.de> X-Mailer: git-send-email 2.45.2 In-Reply-To: 20240605083557.2051480-2-mingo@kernel.org References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:vorSSJBgJ+MWiNnk7sBzlGFrwiy6RvoCMwOVBJOtSeBsjqFsbHS xb2S+4TsJatGuvmUaEH3J6pjX/kuMko4y+mZekTrIMbC1cCyHrSBEZA9fS9/QlrXiNPbNMy 7D4uL8+rwGDDDPiculPA04F++A2zeCp6beGlUeFmKpXbihKOSt/Q5V8ODo2zzH6zR898uy6 mTZpYg1cq8XBwzYJyAWwg== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:oPZUkGHfjD4=;xhPAqNVF+gyVuVmJPmIXc2VGpPI fgJ1BGPtKdJvj94kIOVGAZkp9jI57CI7pfQvgtQpsMEJf+k24Ocy/SJu4VM14fG9TQLPRz8wt 9igPYQlogr/ZxApC44vDbh5mpjm+I5qtOx/ozilYytvsyvKZFfYO5Ij7VTxArLG+pwZiqSyQX c91VQYBaNJ7Msq7fFVwgbtDp72I/ZcM3Pov4UdmdEgn5HNLJVsXI4BJRqUejiOjpkgQBpaziy 5OzCFEcLGC7p3tXGYRBiLKKpRoTJY457n+XN8kEYy/3QV19js4eeJ/uKGCxLZ+M4maflMwwJg kroMVIMEIorgC8VoiBluS+oLvLD8j3jQH0yMJVNvU3prWRUKUhki0WRatSRFAK97iDxzptnbG Jtj73vyJgbpg3bKxk7W/8X0w9Xuzm13kI043IKWvR4H4GJTTzL7EyI++yNaEgd7nMmmSIt9YT wxSlVLZiJZlTCw2gTIcx7NAyHc2iskDNSvLbPtFfdguxwyzfzcfLc+yryjS7vBhEcoeZyLY88 hA6jqSGSx1yIwfnoWgTZwqN1OFl+gPOSpccr407/n9sk4UwXLKZvIaN3eEdbl8K7Py9nPOdyw iIV8vf9PaMWIbW/APC9FMMaSP5lqzzjdPBO5/cRXoldgYbizjDh4SeCG/bYzO71MuQWe2fQ0f XFl7n4G4uUyoyf6Nl5UfuYgQo8+N9PSPbe3IX07CHFKXN3A02Lp1BzjRZdElwfHIe68dUHHzf dtsRYc1X+2JN48AHOHXkFXs8uNNybnj4EEp97POVAujT14T30VPY+rrNDboU0WUUm5adSCsoZ +H6XTyTGtTJ+/G+IZTiTbmUg== Since linux-next-20240730 and in versions next-202408{05,06} the error bel= ow can appear when trying to start a game using wine. The error does not always appear but after some failed attempts at bisecting this I found a way to reliably trigger this by first creating high system load (by compiling a ke= rnel with make -j 16) and then trying to start the game until the error occurs. = If the error does not occur during the time it take to compile the kernel (about ~= 6.5min) I declared the commit as good. Usually the bad commit did not take more than three attempts of starting wine to trigger the error. With this I bisected the problem to commit 81106b7e0b13. To revert this commit in next-20240806 the following commits have to be rev= erted: (HEAD -> wine_usercopy_bug) Revert "x86/fpu: Make task_struct::thread const= ant size"=20 Revert "x86/fpu: Remove the thread::fpu pointer" Revert "x86/fpu: Remove init_task FPU state dependencies, add debugging war= ning for PF_KTHREAD tasks" Revert "x86/CPU/AMD: Always inline amd_clear_divider()" After reverting these commit the next-20240806 seems to be free from the er= ror. The machine used is an Ryzen 5800H (Msi Alpha15 Laptop) running a fully upd= ated (as of 20240807) debian sid. Bert Karwatzki Error message: [T34926] usercopy: Kernel memory overwrite attempt detected to SLUB object = 'task_struct' (offset 3072, size 160)! [T34926] ------------[ cut here ]------------ [T34926] kernel BUG at mm/usercopy.c:102! [T34926] Oops: invalid opcode: 0000 [#1] PREEMPT SMP NOPTI [T34926] CPU: 12 UID: 1000 PID: 34926 Comm: start.exe Not tainted 6.11.0-rc= 2-next-20240806-master-dirty #178 [T34926] Hardware name: Micro-Star International Co., Ltd. Alpha 15 B5EEK/M= S-158L, BIOS E158LAMS.107 11/10/2021 [T34926] RIP: 0010:usercopy_abort+0x73/0x75 [T34926] Code: e0 f2 06 86 eb 0e 48 c7 c2 81 6b 08 86 48 c7 c7 e9 f2 06 86 = 56 48 89 fe 48 c7 c7 d8 47 0c 86 51 48 89 c1 41 52 e8 6d 70 ff ff <0f> 0b 4= 8 89 d9 49 89 e8 44 89 e2 31 f6 48 81 e9 00 00 20 85 48 c7 [T34926] RSP: 0000:ffffa58a47e73cd0 EFLAGS: 00010246 [T34926] RAX: 0000000000000068 RBX: ffff8e1eec1a4a00 RCX: 0000000000000000 [T34926] RDX: 0000000000000000 RSI: ffff8e2cae9177c0 RDI: ffff8e2cae9177c0 [T34926] RBP: 00000000000000a0 R08: 0000000000000000 R09: ffffa58a47e73b78 [T34926] R10: ffffffff8627fe88 R11: 0000000000000003 R12: 0000000000000000 [T34926] R13: ffff8e1eec1a4aa0 R14: ffff8e1eec1a4a00 R15: 0000000000000001 [T34926] FS: 000000003ffe2000(006b) GS:ffff8e2cae900000(0063) knlGS:000000= 00f7ed20c0 [T34926] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [T34926] CR2: 000000003ffed324 CR3: 00000002a58da000 CR4: 0000000000750ef0 [T34926] PKRU: 55555554 [T34926] Call Trace: [T34926] [T34926] ? __die+0x51/0x92 [T34926] ? die+0x29/0x50 [T34926] ? do_trap+0x105/0x110 [T34926] ? do_error_trap+0x60/0x80 [T34926] ? usercopy_abort+0x73/0x75 [T34926] ? exc_invalid_op+0x4d/0x70 [T34926] ? usercopy_abort+0x73/0x75 [T34926] ? asm_exc_invalid_op+0x1a/0x20 [T34926] ? usercopy_abort+0x73/0x75 [T34926] ? __check_heap_object+0x7d/0xa0 [T34926] ? __check_object_size+0x1f9/0x210 [T34926] ? copy_from_buffer+0x40/0x60 [T34926] ? copy_uabi_to_xstate+0xe1/0x1e0 [T34926] ? __fpu_restore_sig+0x403/0x480 [T34926] ? fpu__restore_sig+0x4c/0x90 [T34926] ? ia32_restore_sigcontext+0x129/0x170 [T34926] ? __do_compat_sys_rt_sigreturn+0x68/0xc0 [T34926] ? do_int80_emulation+0x88/0x140 [T34926] ? asm_int80_emulation+0x1a/0x20 [T34926] [T34926] Modules linked in: ccm snd_seq_dummy snd_hrtimer snd_seq_midi snd_= seq_midi_event snd_rawmidi snd_seq snd_seq_device rfcomm bnep nls_ascii nls= _cp437 vfat fat snd_ctl_led snd_hda_codec_realtek snd_hda_codec_generic snd= _hda_scodec_component snd_hda_codec_hdmi btusb btrtl btintel snd_hda_intel = btbcm btmtk snd_intel_dspcfg snd_acp3x_pdm_dma snd_soc_dmic snd_acp3x_rn uv= cvideo bluetooth snd_hda_codec videobuf2_vmalloc snd_soc_core uvc snd_hwdep= videobuf2_memops videobuf2_v4l2 snd_hda_core snd_pcm_oss videodev snd_mixe= r_oss snd_pcm snd_rn_pci_acp3x videobuf2_common snd_acp_config msi_wmi snd_= soc_acpi ecdh_generic amd_atl ecc mc sparse_keymap edac_mce_amd wmi_bmof sn= d_timer snd ccp snd_pci_acp3x k10temp soundcore battery ac joydev button hi= d_sensor_accel_3d hid_sensor_prox hid_sensor_als hid_sensor_magn_3d hid_sen= sor_gyro_3d hid_sensor_trigger industrialio_triggered_buffer kfifo_buf indu= strialio amd_pmc hid_sensor_iio_common evdev hid_multitouch serio_raw mt792= 1e mt7921_common mt792x_lib mt76_connac_lib mt76 [T34926] mac80211 libarc4 cfg80211 rfkill msr fuse nvme_fabrics efi_pstore= configfs efivarfs autofs4 ext4 crc32c_generic mbcache jbd2 usbhid amdgpu i= 2c_algo_bit drm_ttm_helper xhci_pci ttm drm_exec drm_suballoc_helper xhci_h= cd amdxcp drm_buddy hid_sensor_hub usbcore mfd_core nvme gpu_sched i2c_piix= 4 hid_generic crc32c_intel psmouse drm_display_helper amd_sfh usb_common i2= c_smbus nvme_core crc16 r8169 i2c_hid_acpi i2c_hid hid i2c_designware_platf= orm i2c_designware_core [T34926] ---[ end trace 0000000000000000 ]---