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Fri, 16 May 2025 21:13:04 +0800 (CST) From: David Wang <00107082@163.com> To: surenb@google.com, kent.overstreet@linux.dev Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: BUG: unable to handle page fault for address Date: Fri, 16 May 2025 21:12:46 +0800 Message-Id: <20250516131246.6244-1-00107082@163.com> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID:_____wDHAl_POSdoJXONBw--.60693S4 X-Coremail-Antispam: 1Uf129KBjvJXoWfGw48uw45ZF48Cw1DGF45Wrg_yoWkKrWxpr yFgFW7KF48Jr1kXFs7J3W3tw4UAwnrCa15WryxKr1F93WUu3yDJF9rAr1UJFZ8Jr47ta12 vFn2q3WjyF1rXaDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x07UEjgsUUUUU= X-Originating-IP: [111.35.191.17] X-CM-SenderInfo: qqqrilqqysqiywtou0bp/xtbBkAlPqmgnM2XZCQAAs1 X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: E7C2A18000E X-Stat-Signature: b3bsygnxwpjkpgsnc79twah3z5abxkgx X-HE-Tag: 1747401191-841546 X-HE-Meta: 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 e6YEU5G7 9mC1xhtQSboJjZ+zajWB6PGZ8VW8OpZBQYPprzvGDYi87L/zdI+R6ynNgkxkg57EmvcJAniG0ZYPGe6xE/frN/krYBFj2xakQt8CLsY4OCVq2fjnm9bE8Ce8YXna6Wb12qWhiiEzAvwMfES7GV4tYIzB6VBDx2hWUa15vFStda2qMRiextmfNCmDRBJ9+Dp/PaFrJdofRDxSANMIC0ggWd+bMryrYm6w2w3mWhSdBhLFSQt1EsxUMAiaCs5qqRSlu9davIHSGCAaY2q3aC0loQF+W5vFw4tLkJ3ZLygrRzppISyeSrOrHWKZO6f2YLh+49PhMDmqOxJI4worDzCa04kkF5A== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hi, I caught a page fault when I was changing my nvidia driver: (This happens randomly, I can reproduce it with about 1/3 probability) [Fri May 16 12:05:41 2025] BUG: unable to handle page fault for address: ff= ff9d28984c3000 [Fri May 16 12:05:41 2025] #PF: supervisor read access in kernel mode [Fri May 16 12:05:41 2025] #PF: error_code(0x0000) - not-present page ... [Fri May 16 12:05:41 2025] RIP: 0010:release_module_tags+0x103/0x1b0 ... [Fri May 16 12:05:41 2025] Call Trace: [Fri May 16 12:05:41 2025] [Fri May 16 12:05:41 2025] codetag_unload_module+0x135/0x160 [Fri May 16 12:05:41 2025] free_module+0x19/0x1a0 ... (full kernel logs are pasted at the end.) Using a image with DEBUG_INFO, the calltrack parses as: RIP: 0010:release_module_tags (./include/linux/alloc_tag.h:134 lib/alloc_ta= g.c:352 lib/alloc_tag.c:573)=20 [Fri May 16 12:05:41 2025] codetag_unload_module (lib/codetag.c:355)=20 [Fri May 16 12:05:41 2025] free_module (kernel/module/main.c:1305)=20 [Fri May 16 12:05:41 2025] __do_sys_delete_module (kernel/module/main.c:795) The offending lines in my codebase: 126 static inline struct alloc_tag_counters alloc_tag_read(struct alloc_ta= g *tag) 127 { ... 131=20 132 for_each_possible_cpu(cpu) { 133 counter =3D per_cpu_ptr(tag->counters, cpu); >>>> 134 v.bytes +=3D counter->bytes; <--------------here 135 v.calls +=3D counter->calls; Nvidia drivers are out-tree... there could be some strange behavior in it c= auses this.. but, when I check the code, I got concerned about lifecycle of tag->counters. Based on following defination: 108 #define DEFINE_ALLOC_TAG(_alloc_tag) = \ 109 static DEFINE_PER_CPU(struct alloc_tag_counters, _alloc_tag_cn= tr); \ 110 static struct alloc_tag _alloc_tag __used __aligned(8) = \ 111 __section(ALLOC_TAG_SECTION_NAME) =3D { = \ 112 .ct =3D CODE_TAG_INIT, = \ 113 .counters =3D &_alloc_tag_cntr }; 114=20 _alloc_tag_cntr is the data referenced by tag->counters, but they are in di= fferent section, and alloc_tag only prepare storage for section ALLOC_TAG_SECTION_NAME. right? Then what happens to those ".data..percpu" section when module is unloaded? Is it safe to keep using those ".data..percpu" section after module unloade= d, or even during module is unloading? I was expecting page fault when I make following experiments: 1.Load module A 2.Load module B 3.module B alloc memory, and handover the memory to A 4.unload module B (memory profiling report module B has memory not freed) ... after a while.... 5.unload module A, where A free the memory. (when A kfree the memory, the counters used to be in module B's ".data..percpu" section should be referenced, it that section is gone, a pagefault should happen). But, after several trials, not page fault reported.... Would kernel keeps ".data..percpu" since ALLOC_TAG_SECTION_NAME has referen= ce to it, or I just need wait longer for kernel to "purge" those sections. Full logs: [Fri May 16 12:02:28 2025] nvidia-modeset: Loading NVIDIA Kernel Mode Setti= ng Driver for UNIX platforms 550.144.03 Mon Dec 30 17:10:10 UTC 2024 [Fri May 16 12:02:28 2025] [drm] [nvidia-drm] [GPU ID 0x00002600] Loading d= river [Fri May 16 12:02:28 2025] [drm] Initialized nvidia-drm 0.0.0 for 0000:26:0= 0.0 on minor 0 [Fri May 16 12:03:45 2025] [drm] [nvidia-drm] [GPU ID 0x00002600] Unloading= driver [Fri May 16 12:03:46 2025] nvidia-modeset: Unloading [Fri May 16 12:03:46 2025] nvidia-nvlink: Unregistered Nvlink Core, major d= evice number 240 [Fri May 16 12:04:38 2025] VFIO - User Level meta-driver version: 0.3 [Fri May 16 12:04:38 2025] nvidia-nvlink: Nvlink Core is being initialized,= major device number 239 [Fri May 16 12:04:38 2025] nvidia 0000:26:00.0: vgaarb: VGA decodes changed= : olddecodes=3Dnone,decodes=3Dnone:owns=3Dnone [Fri May 16 12:04:38 2025] NVRM: loading NVIDIA UNIX x86_64 Kernel Module = 570.144 Thu Apr 10 20:33:29 UTC 2025 [Fri May 16 12:04:38 2025] nvidia-modeset: Loading NVIDIA Kernel Mode Setti= ng Driver for UNIX platforms 570.144 Thu Apr 10 20:03:03 UTC 2025 [Fri May 16 12:04:38 2025] nvidia_drm: Unknown symbol drm_client_setup (err= -2) [Fri May 16 12:04:40 2025] nvidia-modeset: Unloading [Fri May 16 12:04:40 2025] nvidia-nvlink: Unregistered Nvlink Core, major d= evice number 239 [Fri May 16 12:05:40 2025] VFIO - User Level meta-driver version: 0.3 [Fri May 16 12:05:40 2025] nvidia-nvlink: Nvlink Core is being initialized,= major device number 239 [Fri May 16 12:05:40 2025] nvidia 0000:26:00.0: vgaarb: VGA decodes changed= : olddecodes=3Dnone,decodes=3Dnone:owns=3Dnone [Fri May 16 12:05:40 2025] NVRM: loading NVIDIA UNIX x86_64 Kernel Module = 570.144 Thu Apr 10 20:33:29 UTC 2025 [Fri May 16 12:05:40 2025] nvidia-modeset: Loading NVIDIA Kernel Mode Setti= ng Driver for UNIX platforms 570.144 Thu Apr 10 20:03:03 UTC 2025 [Fri May 16 12:05:40 2025] [drm] [nvidia-drm] [GPU ID 0x00002600] Loading d= river [Fri May 16 12:05:40 2025] [drm] Initialized nvidia-drm 0.0.0 for 0000:26:0= 0.0 on minor 0 [Fri May 16 12:05:40 2025] [drm] [nvidia-drm] [GPU ID 0x00002600] Unloading= driver [Fri May 16 12:05:40 2025] nvidia-modeset: Unloading [Fri May 16 12:05:41 2025] nvidia-nvlink: Unregistered Nvlink Core, major d= evice number 239 [Fri May 16 12:05:41 2025] BUG: unable to handle page fault for address: ff= ff9d28984c3000 [Fri May 16 12:05:41 2025] #PF: supervisor read access in kernel mode [Fri May 16 12:05:41 2025] #PF: error_code(0x0000) - not-present page [Fri May 16 12:05:41 2025] PGD 163001067 P4D 163001067 PUD 0=20 [Fri May 16 12:05:41 2025] Oops: Oops: 0000 [#1] SMP NOPTI [Fri May 16 12:05:41 2025] CPU: 0 UID: 0 PID: 35898 Comm: modprobe Tainted:= G OE 6.15.0-rc6-linan-0 #587 PREEMPT(voluntary)=20 [Fri May 16 12:05:41 2025] Tainted: [O]=3DOOT_MODULE, [E]=3DUNSIGNED_MODULE [Fri May 16 12:05:41 2025] Hardware name: Micro-Star International Co., Ltd= . MS-7B89/B450M MORTAR MAX (MS-7B89), BIOS 2.L0 07/18/2024 [Fri May 16 12:05:41 2025] RIP: 0010:release_module_tags+0x103/0x1b0 [Fri May 16 12:05:41 2025] Code: e3 4c 03 64 24 08 4c 39 e3 72 bf 8b 0d 86 = 02 f6 00 31 ed 31 c0 eb 17 48 63 f0 49 8b 54 24 20 83 c0 01 48 8b 34 f5 40 = e6 d4 95 <48> 03 2c 16 89 ce 48 63 d0 48 c7 c7 c0 fd d4 95 e8 78 3f f5 ff 8b [Fri May 16 12:05:41 2025] RSP: 0018:ffffb2eb40bdfe00 EFLAGS: 00010202 [Fri May 16 12:05:41 2025] RAX: 0000000000000001 RBX: ffffffffc04609d7 RCX:= 0000000000000008 [Fri May 16 12:05:41 2025] RDX: 0000000000000000 RSI: ffff9d28984c3000 RDI:= ffffffff95d4fdc0 [Fri May 16 12:05:41 2025] RBP: 0000000000000000 R08: ffff9d25035aed08 R09:= 000000000000fcf8 [Fri May 16 12:05:41 2025] R10: ffffb2eb40bdfe00 R11: 0000000000000001 R12:= ffffffffc04609b0 [Fri May 16 12:05:41 2025] R13: ffffffffc19ef000 R14: ffff9d2502ab6870 R15:= 0000000000000000 [Fri May 16 12:05:41 2025] FS: 00007fe9ee051040(0000) GS:ffff9d28984c3000(= 0000) knlGS:0000000000000000 [Fri May 16 12:05:41 2025] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [Fri May 16 12:05:41 2025] CR2: ffff9d28984c3000 CR3: 000000011278d000 CR4:= 0000000000350ef0 [Fri May 16 12:05:41 2025] Call Trace: [Fri May 16 12:05:41 2025] [Fri May 16 12:05:41 2025] codetag_unload_module+0x135/0x160 [Fri May 16 12:05:41 2025] free_module+0x19/0x1a0 [Fri May 16 12:05:41 2025] __do_sys_delete_module+0x274/0x310 [Fri May 16 12:05:41 2025] ? srso_return_thunk+0x5/0x5f [Fri May 16 12:05:41 2025] ? fpregs_assert_state_consistent+0x21/0x50 [Fri May 16 12:05:41 2025] ? srso_return_thunk+0x5/0x5f [Fri May 16 12:05:41 2025] do_syscall_64+0x4b/0x120 [Fri May 16 12:05:41 2025] entry_SYSCALL_64_after_hwframe+0x76/0x7e [Fri May 16 12:05:41 2025] RIP: 0033:0x7fe9ed928a67 [Fri May 16 12:05:41 2025] Code: 73 01 c3 48 8b 0d 99 83 0c 00 f7 d8 64 89 = 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 b0 00 00 = 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 69 83 0c 00 f7 d8 64 89 01 48 [Fri May 16 12:05:41 2025] RSP: 002b:00007ffe17759568 EFLAGS: 00000206 ORIG= _RAX: 00000000000000b0 [Fri May 16 12:05:41 2025] RAX: ffffffffffffffda RBX: 0000564f850b7e70 RCX:= 00007fe9ed928a67 [Fri May 16 12:05:41 2025] RDX: 0000000000000000 RSI: 0000000000000800 RDI:= 0000564f850b7ed8 [Fri May 16 12:05:41 2025] RBP: 0000000000000000 R08: 1999999999999999 R09:= 0000000000000000 [Fri May 16 12:05:41 2025] R10: 00007fe9ed99bac0 R11: 0000000000000206 R12:= 0000000000000000 [Fri May 16 12:05:41 2025] R13: 0000000000000000 R14: 00007ffe177595a0 R15:= 00007ffe1775aa60 [Fri May 16 12:05:41 2025] [Fri May 16 12:05:41 2025] Modules linked in: vfio_pci_core(E-) vfio(E) drm= _client_lib(E) amd_atl(E) intel_rapl_msr(E) intel_rapl_common(E) binfmt_mis= c(E) edac_mce_amd(E) kvm_amd(E) snd_hda_codec_realtek(E) nls_ascii(E) iwlmv= m(E) nls_cp437(E) snd_hda_codec_generic(E) snd_hda_codec_hdmi(E) kvm(E) snd= _hda_scodec_component(E) mac80211(E) irqbypass(E) uvcvideo(E) vfat(E) snd_h= da_intel(E) libarc4(E) ghash_clmulni_intel(E) fat(E) videobuf2_vmalloc(E) s= nd_intel_dspcfg(E) sha256_ssse3(E) uvc(E) snd_usb_audio(E) sha1_ssse3(E) sn= d_hda_codec(E) videobuf2_memops(E) iwlwifi(E) drm_ttm_helper(E) videobuf2_v= 4l2(E) aesni_intel(E) snd_usbmidi_lib(E) snd_hda_core(E) ttm(E) snd_rawmidi= (E) gf128mul(E) snd_pcsp(E) snd_seq_device(E) ppdev(E) snd_hwdep(E) crypto_= simd(E) drm_kms_helper(E) videodev(E) cryptd(E) cfg80211(E) snd_pcm(E) vide= obuf2_common(E) rapl(E) snd_timer(E) sp5100_tco(E) drm(E) mc(E) wmi_bmof(E)= k10temp(E) tpm_crb(E) rfkill(E) snd(E) sha3_generic(E) video(E) soundcore(= E) jitterentropy_rng(E) sha512_ssse3(E) tpm_tis(E) ccp(E) [Fri May 16 12:05:41 2025] sha512_generic(E) tpm_tis_core(E) joydev(E) drb= g(E) tpm(E) ansi_cprng(E) libaescfb(E) ecdh_generic(E) ecc(E) parport_pc(E)= parport(E) sg(E) rng_core(E) evdev(E) msr(E) loop(E) fuse(E) efi_pstore(E)= dm_mod(E) configfs(E) ip_tables(E) x_tables(E) autofs4(E) ext4(E) crc16(E)= mbcache(E) jbd2(E) btrfs(E) blake2b_generic(E) efivarfs(E) raid10(E) raid4= 56(E) async_raid6_recov(E) async_memcpy(E) async_pq(E) async_xor(E) async_t= x(E) xor(E) raid6_pq(E) raid1(E) raid0(E) md_mod(E) hid_generic(E) usbhid(E= ) hid(E) sd_mod(E) ahci(E) xhci_pci(E) libahci(E) nvme(E) xhci_hcd(E) libat= a(E) i2c_piix4(E) i2c_smbus(E) r8169(E) nvme_core(E) realtek(E) usbcore(E) = scsi_mod(E) scsi_common(E) usb_common(E) wmi(E) gpio_amdpt(E) gpio_generic(= E) button(E) [last unloaded: vfio_pci_core(E)] [Fri May 16 12:05:41 2025] CR2: ffff9d28984c3000 [Fri May 16 12:05:41 2025] ---[ end trace 0000000000000000 ]--- [Fri May 16 12:05:41 2025] RIP: 0010:release_module_tags+0x103/0x1b0 [Fri May 16 12:05:41 2025] Code: e3 4c 03 64 24 08 4c 39 e3 72 bf 8b 0d 86 = 02 f6 00 31 ed 31 c0 eb 17 48 63 f0 49 8b 54 24 20 83 c0 01 48 8b 34 f5 40 = e6 d4 95 <48> 03 2c 16 89 ce 48 63 d0 48 c7 c7 c0 fd d4 95 e8 78 3f f5 ff 8b [Fri May 16 12:05:41 2025] RSP: 0018:ffffb2eb40bdfe00 EFLAGS: 00010202 [Fri May 16 12:05:41 2025] RAX: 0000000000000001 RBX: ffffffffc04609d7 RCX:= 0000000000000008 [Fri May 16 12:05:41 2025] RDX: 0000000000000000 RSI: ffff9d28984c3000 RDI:= ffffffff95d4fdc0 [Fri May 16 12:05:41 2025] RBP: 0000000000000000 R08: ffff9d25035aed08 R09:= 000000000000fcf8 [Fri May 16 12:05:41 2025] R10: ffffb2eb40bdfe00 R11: 0000000000000001 R12:= ffffffffc04609b0 [Fri May 16 12:05:41 2025] R13: ffffffffc19ef000 R14: ffff9d2502ab6870 R15:= 0000000000000000 [Fri May 16 12:05:41 2025] FS: 00007fe9ee051040(0000) GS:ffff9d28984c3000(= 0000) knlGS:0000000000000000 [Fri May 16 12:05:41 2025] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [Fri May 16 12:05:41 2025] CR2: ffff9d28984c3000 CR3: 000000011278d000 CR4:= 0000000000350ef0 [Fri May 16 12:05:41 2025] note: modprobe[35898] exited with irqs disabled [Fri May 16 12:05:41 2025] note: modprobe[35898] exited with preempt_count 1 Thanks David