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X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: uyT+VciXLuvWt42D66vzdKzvSUg3KzTwpD47j7iNQpbuI9Uqw6xZxIpfdVhZ5oUQ2zKW8ziIQyooIMfslSESBQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR11MB4578 X-OriginatorOrg: intel.com hi, Petr, On Thu, Apr 16, 2026 at 08:40:51AM +0200, Petr Vorel wrote: > Hi all, > > [ Cc Mimi and linux-integrity ] > > Hello, > > > kernel test robot noticed "BUG:KASAN:slab-out-of-bounds_in_parse_vswing_preemph_snps" on: > > > commit: 07d1ee54da4966c1457602dc088a8a43b29254cb ("[PATCH v1 15/16] drm/i915/bios: search for VBT #57 by default") > > url: https://github.com/intel-lab-lkp/linux/commits/Micha-Grzelak/drm-i915-lt-align-xe3plpd-with-VS-PE-Override-layout/20260401-092928 > > base: https://gitlab.freedesktop.org/drm/i915/kernel.git for-linux-next > > patch link: https://lore.kernel.org/all/20260331183332.1773886-16-michal.grzelak@intel.com/ > > patch subject: [PATCH v1 15/16] drm/i915/bios: search for VBT #57 by default > > > in testcase: ltp > > version: > > with following parameters: > > > test: ima > > > > > config: x86_64-rhel-9.4-ltp > > compiler: gcc-14 > > test machine: 22 threads 1 sockets Intel(R) Core(TM) Ultra 9 185H @ 4.5GHz (Meteor Lake) with 32G memory > > > (please refer to attached dmesg/kmsg for entire log/backtrace) > > > > > If you fix the issue in a separate patch/commit (i.e. not just a new version of > > the same patch/commit), kindly add following tags > > | Reported-by: kernel test robot > > | Closes: https://lore.kernel.org/oe-lkp/202604150702.d409a2b6-lkp@intel.com > > > > The kernel config and materials to reproduce are available at: > > https://download.01.org/0day-ci/archive/20260415/202604150702.d409a2b6-lkp@intel.com > > > > kern :err : [ 27.966990] [ T399] ================================================================== > > kern :err : [ 27.968126] [ T399] BUG: KASAN: slab-out-of-bounds in parse_vswing_preemph_snps+0x2dd/0x430 [i915] > > kern :err : [ 27.969712] [ T399] Read of size 4 at addr ffff8881eba2c49d by task (udev-worker)/399 > > > kern :err : [ 27.971135] [ T399] CPU: 4 UID: 0 PID: 399 Comm: (udev-worker) Tainted: G S 7.0.0-rc4-01496-g07d1ee54da49 #1 PREEMPT(lazy) > > kern :err : [ 27.971139] [ T399] Tainted: [S]=CPU_OUT_OF_SPEC > > kern :err : [ 27.971140] [ T399] Hardware name: ASUSTeK COMPUTER INC. NUC14RVS-B/NUC14RVSU9, BIOS RVMTL357.0047.2025.0108.1408 01/08/2025 > > kern :err : [ 27.971142] [ T399] Call Trace: > > kern :err : [ 27.971144] [ T399] > > kern :err : [ 27.971145] [ T399] dump_stack_lvl+0x47/0x70 > > kern :err : [ 27.971152] [ T399] print_address_description+0x88/0x320 > > kern :err : [ 27.971156] [ T399] ? parse_vswing_preemph_snps+0x2dd/0x430 [i915] > > kern :err : [ 27.971355] [ T399] print_report+0x106/0x1f4 > > kern :err : [ 27.971357] [ T399] ? __virt_addr_valid+0xc4/0x230 > > kern :err : [ 27.971360] [ T399] ? parse_vswing_preemph_snps+0x2dd/0x430 [i915] > > kern :err : [ 27.971533] [ T399] kasan_report+0xb5/0xf0 > > kern :err : [ 27.971537] [ T399] ? parse_vswing_preemph_snps+0x2dd/0x430 [i915] > > kern :err : [ 27.971704] [ T399] parse_vswing_preemph_snps+0x2dd/0x430 [i915] > > kern :err : [ 27.971868] [ T399] intel_bios_init+0xcc1/0x14b0 [i915] > > kern :err : [ 27.972042] [ T399] ? drm_vblank_init+0x147/0x330 [drm] > > kern :err : [ 27.972105] [ T399] intel_display_driver_probe_noirq+0x8d/0x870 [i915] > > kern :err : [ 27.972295] [ T399] i915_driver_probe+0x209/0x9f0 [i915] > > kern :err : [ 27.972445] [ T399] ? __pfx_mutex_lock+0x10/0x10 > > kern :err : [ 27.972450] [ T399] ? mutex_lock+0x91/0xf0 > > kern :err : [ 27.972451] [ T399] ? __pfx_i915_driver_probe+0x10/0x10 [i915] > > kern :err : [ 27.972597] [ T399] ? drm_privacy_screen_get+0x2bf/0x370 [drm] > > kern :err : [ 27.972628] [ T399] ? intel_display_driver_probe_defer+0x41/0x70 [i915] > > kern :err : [ 27.972814] [ T399] ? i915_pci_probe+0x2ab/0x3b0 [i915] > > kern :err : [ 27.972963] [ T399] ? __pfx_i915_pci_probe+0x10/0x10 [i915] > > kern :err : [ 27.973110] [ T399] local_pci_probe+0xdb/0x1b0 > > kern :err : [ 27.973114] [ T399] pci_call_probe+0x153/0x4f0 > > kern :err : [ 27.973116] [ T399] ? __pfx_pci_call_probe+0x10/0x10 > > kern :err : [ 27.973117] [ T399] ? __pfx__raw_spin_lock+0x10/0x10 > > kern :err : [ 27.973119] [ T399] ? pci_assign_irq+0x80/0x2f0 > > kern :err : [ 27.973121] [ T399] ? pci_match_device+0x38d/0x6b0 > > kern :err : [ 27.973123] [ T399] ? kernfs_create_link+0x164/0x230 > > kern :err : [ 27.973127] [ T399] pci_device_probe+0x173/0x2f0 > > kern :err : [ 27.973128] [ T399] call_driver_probe+0x62/0x1f0 > > kern :err : [ 27.973132] [ T399] really_probe+0x197/0x770 > > kern :err : [ 27.973134] [ T399] __driver_probe_device+0x18c/0x3b0 > > kern :err : [ 27.973137] [ T399] driver_probe_device+0x4a/0x130 > > kern :err : [ 27.973139] [ T399] __driver_attach+0x18c/0x4f0 > > kern :err : [ 27.973141] [ T399] ? __pfx___driver_attach+0x10/0x10 > > kern :err : [ 27.973143] [ T399] bus_for_each_dev+0xef/0x170 > > kern :err : [ 27.973145] [ T399] ? kasan_unpoison+0x40/0x70 > > kern :err : [ 27.973147] [ T399] ? __pfx_bus_for_each_dev+0x10/0x10 > > kern :err : [ 27.973149] [ T399] ? __kasan_slab_alloc+0x2f/0x70 > > kern :err : [ 27.973152] [ T399] ? klist_add_tail+0x132/0x270 > > kern :err : [ 27.973154] [ T399] bus_add_driver+0x2a7/0x4f0 > > kern :err : [ 27.973156] [ T399] driver_register+0x1a1/0x370 > > kern :err : [ 27.973158] [ T399] i915_init+0x57/0x160 [i915] > > kern :err : [ 27.973307] [ T399] ? __pfx_i915_init+0x10/0x10 [i915] > > kern :err : [ 27.973453] [ T399] do_one_initcall+0x8d/0x3f0 > > kern :err : [ 27.973455] [ T399] ? __pfx_do_one_initcall+0x10/0x10 > > kern :err : [ 27.973457] [ T399] ? kasan_unpoison+0x3b/0x70 > > kern :err : [ 27.973458] [ T399] ? kasan_unpoison+0x40/0x70 > > kern :err : [ 27.973460] [ T399] do_init_module+0x281/0x830 > > kern :err : [ 27.973463] [ T399] ? __pfx_do_init_module+0x10/0x10 > > kern :err : [ 27.973464] [ T399] ? kfree+0x195/0x430 > > kern :err : [ 27.973467] [ T399] load_module+0x173d/0x2070 > > kern :err : [ 27.973469] [ T399] ? ima_post_read_file+0x18f/0x230 > > I'm surprised, but indeed it's could be triggered by IMA. > > Looking at full dmesg [1] I'm surprised that this is triggered before tests are > actually run and there is no IMA specific kernel command line parameter. That > means that error is not related to any LTP test. > > Is it always reproducible or just a random glitch? in our tests, it's quite persistent and clean on parent: ========================================================================================= tbox_group/testcase/rootfs/kconfig/compiler/test: igk-mtl-nuc02/ltp/debian-13-x86_64-20250902.cgz/x86_64-rhel-9.4-ltp/gcc-14/ima e3d53a63657f3213 07d1ee54da4966c1457602dc088 ---------------- --------------------------- fail:runs %reproduction fail:runs | | | :6 100% 6:6 dmesg.BUG:KASAN:slab-out-of-bounds_in_parse_vswing_preemph_snps > > ima_post_read_file() is a part of IMA core therefore issue might be not related > to any config, but just FYI kernel config [2]. > > Kind regards, > Petr > > [1] https://download.01.org/0day-ci/archive/20260415/202604150702.d409a2b6-lkp@intel.com/kmsg.xz > [2] https://download.01.org/0day-ci/archive/20260415/202604150702.d409a2b6-lkp@intel.com/config-7.0.0-rc4-01496-g07d1ee54da49 > > > kern :err : [ 27.973474] [ T399] ? __pfx_load_module+0x10/0x10 > > kern :err : [ 27.973476] [ T399] ? security_kernel_post_read_file+0x35/0xf0 > > kern :err : [ 27.973479] [ T399] ? __pfx_kernel_read_file+0x10/0x10 > > kern :err : [ 27.973483] [ T399] ? __pfx_current_time+0x10/0x10 > > kern :err : [ 27.973486] [ T399] ? init_module_from_file+0x157/0x1b0 > > kern :err : [ 27.973487] [ T399] init_module_from_file+0x157/0x1b0 > > kern :err : [ 27.973489] [ T399] ? __pfx_init_module_from_file+0x10/0x10 > > kern :err : [ 27.973491] [ T399] ? touch_atime+0x1bc/0x4f0 > > kern :err : [ 27.973493] [ T399] ? _raw_spin_lock+0x80/0xf0 > > kern :err : [ 27.973494] [ T399] ? __pfx__raw_spin_lock+0x10/0x10 > > kern :err : [ 27.973496] [ T399] ? __pfx_filemap_read+0x10/0x10 > > kern :err : [ 27.973498] [ T399] ? do_sys_openat2+0xeb/0x170 > > kern :err : [ 27.973501] [ T399] idempotent_init_module+0x21c/0x770 > > kern :err : [ 27.973503] [ T399] ? __pfx_idempotent_init_module+0x10/0x10 > > kern :err : [ 27.973505] [ T399] ? fdget+0x54/0x3b0 > > kern :err : [ 27.973506] [ T399] ? security_capable+0x35/0xf0 > > kern :err : [ 27.973509] [ T399] __x64_sys_finit_module+0xca/0x170 > > kern :err : [ 27.973511] [ T399] do_syscall_64+0x108/0x5b0 > > kern :err : [ 27.973513] [ T399] ? vfs_read+0x3be/0x9b0 > > kern :err : [ 27.973514] [ T399] ? vfs_read+0x3be/0x9b0 > > kern :err : [ 27.973516] [ T399] ? __pfx_vfs_read+0x10/0x10 > > kern :err : [ 27.973517] [ T399] ? __pfx__raw_spin_lock+0x10/0x10 > > kern :err : [ 27.973519] [ T399] ? fdget+0x54/0x3b0 > > kern :err : [ 27.973520] [ T399] ? __pfx___seccomp_filter+0x10/0x10 > > kern :err : [ 27.973523] [ T399] ? __x64_sys_pread64+0x18d/0x1f0 > > kern :err : [ 27.973525] [ T399] ? __pfx___x64_sys_pread64+0x10/0x10 > > kern :err : [ 27.973526] [ T399] ? fdget+0x54/0x3b0 > > kern :err : [ 27.973528] [ T399] ? security_capable+0x35/0xf0 > > kern :err : [ 27.973530] [ T399] ? do_syscall_64+0x140/0x5b0 > > kern :err : [ 27.973531] [ T399] ? arch_exit_to_user_mode_prepare+0x9e/0xf0 > > kern :err : [ 27.973533] [ T399] ? do_syscall_64+0x140/0x5b0 > > kern :err : [ 27.973534] [ T399] ? __x64_sys_openat+0x104/0x1f0 > > kern :err : [ 27.973536] [ T399] ? __pfx___x64_sys_openat+0x10/0x10 > > kern :err : [ 27.973538] [ T399] ? do_syscall_64+0x140/0x5b0 > > kern :err : [ 27.973540] [ T399] ? do_syscall_64+0x140/0x5b0 > > kern :err : [ 27.973541] [ T399] ? irqentry_exit+0x76/0x4f0 > > kern :err : [ 27.973544] [ T399] entry_SYSCALL_64_after_hwframe+0x76/0x7e > > kern :err : [ 27.973546] [ T399] RIP: 0033:0x7f3689aa8779 > > kern :err : [ 27.973549] [ T399] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 67 76 0d 00 f7 d8 64 89 01 48 > > kern :err : [ 27.973551] [ T399] RSP: 002b:00007ffca3326338 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 > > kern :err : [ 27.973555] [ T399] RAX: ffffffffffffffda RBX: 000055c94afdd3e0 RCX: 00007f3689aa8779 > > kern :err : [ 27.973556] [ T399] RDX: 0000000000000000 RSI: 00007f36882ae44d RDI: 0000000000000053 > > kern :err : [ 27.973557] [ T399] RBP: 0000000000000000 R08: 0000000000000000 R09: 000055c94af65b30 > > kern :err : [ 27.973558] [ T399] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f36882ae44d > > kern :err : [ 27.973559] [ T399] R13: 0000000000020000 R14: 000055c94afb65f0 R15: 0000000000000000 > > kern :err : [ 27.973561] [ T399] > > > kern :err : [ 28.051757] [ T399] Allocated by task 399: > > kern :warn : [ 28.052350] [ T399] kasan_save_stack+0x1e/0x70 > > kern :warn : [ 28.053001] [ T399] kasan_save_track+0x10/0x30 > > kern :warn : [ 28.053646] [ T399] __kasan_kmalloc+0x8b/0xb0 > > kern :warn : [ 28.054278] [ T399] __kmalloc_noprof+0x1d8/0x5f0 > > kern :warn : [ 28.054944] [ T399] init_bdb_block+0x128/0xc30 [i915] > > kern :warn : [ 28.055915] [ T399] intel_bios_init+0x4de/0x14b0 [i915] > > kern :warn : [ 28.056854] [ T399] intel_display_driver_probe_noirq+0x8d/0x870 [i915] > > kern :warn : [ 28.057984] [ T399] i915_driver_probe+0x209/0x9f0 [i915] > > kern :warn : [ 28.058917] [ T399] local_pci_probe+0xdb/0x1b0 > > kern :warn : [ 28.059565] [ T399] pci_call_probe+0x153/0x4f0 > > kern :warn : [ 28.060210] [ T399] pci_device_probe+0x173/0x2f0 > > kern :warn : [ 28.060878] [ T399] call_driver_probe+0x62/0x1f0 > > kern :warn : [ 28.061547] [ T399] really_probe+0x197/0x770 > > kern :warn : [ 28.062168] [ T399] __driver_probe_device+0x18c/0x3b0 > > kern :warn : [ 28.062894] [ T399] driver_probe_device+0x4a/0x130 > > kern :warn : [ 28.063587] [ T399] __driver_attach+0x18c/0x4f0 > > kern :warn : [ 28.064243] [ T399] bus_for_each_dev+0xef/0x170 > > kern :warn : [ 28.064898] [ T399] bus_add_driver+0x2a7/0x4f0 > > kern :warn : [ 28.065543] [ T399] driver_register+0x1a1/0x370 > > kern :warn : [ 28.066202] [ T399] i915_init+0x57/0x160 [i915] > > kern :warn : [ 28.067030] [ T399] do_one_initcall+0x8d/0x3f0 > > kern :warn : [ 28.067677] [ T399] do_init_module+0x281/0x830 > > kern :warn : [ 28.068320] [ T399] load_module+0x173d/0x2070 > > kern :warn : [ 28.068951] [ T399] init_module_from_file+0x157/0x1b0 > > kern :warn : [ 28.069678] [ T399] idempotent_init_module+0x21c/0x770 > > kern :warn : [ 28.070417] [ T399] __x64_sys_finit_module+0xca/0x170 > > kern :warn : [ 28.071143] [ T399] do_syscall_64+0x108/0x5b0 > > kern :warn : [ 28.071777] [ T399] entry_SYSCALL_64_after_hwframe+0x76/0x7e > > > kern :err : [ 28.072915] [ T399] The buggy address belongs to the object at ffff8881eba2c000 > > which belongs to the cache kmalloc-2k of size 2048 > > kern :err : [ 28.074832] [ T399] The buggy address is located 0 bytes to the right of > > allocated 1181-byte region [ffff8881eba2c000, ffff8881eba2c49d) > > > kern :err : [ 28.077135] [ T399] The buggy address belongs to the physical page: > > kern :warn : [ 28.078017] [ T399] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1eba28 > > kern :warn : [ 28.079226] [ T399] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 > > kern :warn : [ 28.080389] [ T399] flags: 0x17ffffc0000040(head|node=0|zone=2|lastcpupid=0x1fffff) > > kern :warn : [ 28.081460] [ T399] page_type: f5(slab) > > kern :warn : [ 28.082008] [ T399] raw: 0017ffffc0000040 ffff888100042f00 dead000000000100 dead000000000122 > > kern :warn : [ 28.083180] [ T399] raw: 0000000000000000 0000000800080008 00000000f5000000 0000000000000000 > > kern :warn : [ 28.084355] [ T399] head: 0017ffffc0000040 ffff888100042f00 dead000000000100 dead000000000122 > > kern :warn : [ 28.085541] [ T399] head: 0000000000000000 0000000800080008 00000000f5000000 0000000000000000 > > kern :warn : [ 28.086725] [ T399] head: 0017ffffc0000003 ffffea0007ae8a01 00000000ffffffff 00000000ffffffff > > kern :warn : [ 28.087909] [ T399] head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 > > kern :warn : [ 28.089093] [ T399] page dumped because: kasan: bad access detected > > > kern :err : [ 28.090297] [ T399] Memory state around the buggy address: > > kern :err : [ 28.091073] [ T399] ffff8881eba2c380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > > kern :err : [ 28.092175] [ T399] ffff8881eba2c400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > > kern :err : [ 28.093276] [ T399] >ffff8881eba2c480: 00 00 00 05 fc fc fc fc fc fc fc fc fc fc fc fc > > kern :err : [ 28.094376] [ T399] ^ > > kern :err : [ 28.095041] [ T399] ffff8881eba2c500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > > kern :err : [ 28.096145] [ T399] ffff8881eba2c580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > > kern :err : [ 28.097247] [ T399] ================================================================== > > kern :warn : [ 28.098668] [ T399] Disabling lock debugging due to kernel taint