Date
June 25, 2025, 8:08 a.m.
Environment | |
---|---|
qemu-arm64 | |
qemu-x86_64 |
[ 26.945044] ================================================================== [ 26.945139] BUG: KASAN: slab-use-after-free in ksize_uaf+0x598/0x5f8 [ 26.945206] Read of size 1 at addr fff00000c7895300 by task kunit_try_catch/208 [ 26.945316] [ 26.945358] CPU: 1 UID: 0 PID: 208 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc3-next-20250625 #1 PREEMPT [ 26.945453] Tainted: [B]=BAD_PAGE, [N]=TEST [ 26.945480] Hardware name: linux,dummy-virt (DT) [ 26.945512] Call trace: [ 26.945535] show_stack+0x20/0x38 (C) [ 26.945593] dump_stack_lvl+0x8c/0xd0 [ 26.945643] print_report+0x118/0x608 [ 26.945690] kasan_report+0xdc/0x128 [ 26.945743] __asan_report_load1_noabort+0x20/0x30 [ 26.945791] ksize_uaf+0x598/0x5f8 [ 26.945831] kunit_try_run_case+0x170/0x3f0 [ 26.945878] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 26.945930] kthread+0x328/0x630 [ 26.945972] ret_from_fork+0x10/0x20 [ 26.946018] [ 26.946037] Allocated by task 208: [ 26.946064] kasan_save_stack+0x3c/0x68 [ 26.946108] kasan_save_track+0x20/0x40 [ 26.946146] kasan_save_alloc_info+0x40/0x58 [ 26.946183] __kasan_kmalloc+0xd4/0xd8 [ 26.946220] __kmalloc_cache_noprof+0x16c/0x3c0 [ 26.946260] ksize_uaf+0xb8/0x5f8 [ 26.946294] kunit_try_run_case+0x170/0x3f0 [ 26.946332] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 26.946376] kthread+0x328/0x630 [ 26.946708] ret_from_fork+0x10/0x20 [ 26.946763] [ 26.947037] Freed by task 208: [ 26.947072] kasan_save_stack+0x3c/0x68 [ 26.947137] kasan_save_track+0x20/0x40 [ 26.947297] kasan_save_free_info+0x4c/0x78 [ 26.947443] __kasan_slab_free+0x6c/0x98 [ 26.947496] kfree+0x214/0x3c8 [ 26.947531] ksize_uaf+0x11c/0x5f8 [ 26.947567] kunit_try_run_case+0x170/0x3f0 [ 26.947742] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 26.947820] kthread+0x328/0x630 [ 26.947855] ret_from_fork+0x10/0x20 [ 26.948035] [ 26.948057] The buggy address belongs to the object at fff00000c7895300 [ 26.948057] which belongs to the cache kmalloc-128 of size 128 [ 26.948117] The buggy address is located 0 bytes inside of [ 26.948117] freed 128-byte region [fff00000c7895300, fff00000c7895380) [ 26.948543] [ 26.948639] The buggy address belongs to the physical page: [ 26.948708] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107895 [ 26.948827] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 26.948994] page_type: f5(slab) [ 26.949304] raw: 0bfffe0000000000 fff00000c0001a00 dead000000000122 0000000000000000 [ 26.949486] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 [ 26.949663] page dumped because: kasan: bad access detected [ 26.949772] [ 26.949936] Memory state around the buggy address: [ 26.949987] fff00000c7895200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.950418] fff00000c7895280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.950530] >fff00000c7895300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.950649] ^ [ 26.950795] fff00000c7895380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.951014] fff00000c7895400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.951307] ================================================================== [ 26.952751] ================================================================== [ 26.953063] BUG: KASAN: slab-use-after-free in ksize_uaf+0x544/0x5f8 [ 26.953230] Read of size 1 at addr fff00000c7895378 by task kunit_try_catch/208 [ 26.953415] [ 26.953633] CPU: 1 UID: 0 PID: 208 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc3-next-20250625 #1 PREEMPT [ 26.953846] Tainted: [B]=BAD_PAGE, [N]=TEST [ 26.954024] Hardware name: linux,dummy-virt (DT) [ 26.954609] Call trace: [ 26.954723] show_stack+0x20/0x38 (C) [ 26.954985] dump_stack_lvl+0x8c/0xd0 [ 26.955066] print_report+0x118/0x608 [ 26.955433] kasan_report+0xdc/0x128 [ 26.956017] __asan_report_load1_noabort+0x20/0x30 [ 26.956098] ksize_uaf+0x544/0x5f8 [ 26.956233] kunit_try_run_case+0x170/0x3f0 [ 26.956383] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 26.956519] kthread+0x328/0x630 [ 26.956571] ret_from_fork+0x10/0x20 [ 26.956625] [ 26.956856] Allocated by task 208: [ 26.957187] kasan_save_stack+0x3c/0x68 [ 26.957411] kasan_save_track+0x20/0x40 [ 26.957619] kasan_save_alloc_info+0x40/0x58 [ 26.957764] __kasan_kmalloc+0xd4/0xd8 [ 26.957886] __kmalloc_cache_noprof+0x16c/0x3c0 [ 26.958002] ksize_uaf+0xb8/0x5f8 [ 26.958095] kunit_try_run_case+0x170/0x3f0 [ 26.958200] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 26.958412] kthread+0x328/0x630 [ 26.958519] ret_from_fork+0x10/0x20 [ 26.958666] [ 26.958714] Freed by task 208: [ 26.958778] kasan_save_stack+0x3c/0x68 [ 26.958846] kasan_save_track+0x20/0x40 [ 26.958883] kasan_save_free_info+0x4c/0x78 [ 26.958920] __kasan_slab_free+0x6c/0x98 [ 26.958963] kfree+0x214/0x3c8 [ 26.959016] ksize_uaf+0x11c/0x5f8 [ 26.959060] kunit_try_run_case+0x170/0x3f0 [ 26.959104] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 26.959149] kthread+0x328/0x630 [ 26.959182] ret_from_fork+0x10/0x20 [ 26.959217] [ 26.959237] The buggy address belongs to the object at fff00000c7895300 [ 26.959237] which belongs to the cache kmalloc-128 of size 128 [ 26.959294] The buggy address is located 120 bytes inside of [ 26.959294] freed 128-byte region [fff00000c7895300, fff00000c7895380) [ 26.959361] [ 26.959382] The buggy address belongs to the physical page: [ 26.959853] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107895 [ 26.959915] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 26.959962] page_type: f5(slab) [ 26.959998] raw: 0bfffe0000000000 fff00000c0001a00 dead000000000122 0000000000000000 [ 26.960721] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 [ 26.960929] page dumped because: kasan: bad access detected [ 26.960981] [ 26.961124] Memory state around the buggy address: [ 26.961288] fff00000c7895200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.961557] fff00000c7895280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.961608] >fff00000c7895300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.961771] ^ [ 26.961863] fff00000c7895380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.962044] fff00000c7895400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.962138] ================================================================== [ 26.931716] ================================================================== [ 26.931961] BUG: KASAN: slab-use-after-free in ksize_uaf+0x168/0x5f8 [ 26.932197] Read of size 1 at addr fff00000c7895300 by task kunit_try_catch/208 [ 26.932670] [ 26.932774] CPU: 1 UID: 0 PID: 208 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc3-next-20250625 #1 PREEMPT [ 26.933128] Tainted: [B]=BAD_PAGE, [N]=TEST [ 26.933367] Hardware name: linux,dummy-virt (DT) [ 26.933449] Call trace: [ 26.933621] show_stack+0x20/0x38 (C) [ 26.933869] dump_stack_lvl+0x8c/0xd0 [ 26.933955] print_report+0x118/0x608 [ 26.934012] kasan_report+0xdc/0x128 [ 26.934071] __kasan_check_byte+0x54/0x70 [ 26.934120] ksize+0x30/0x88 [ 26.934164] ksize_uaf+0x168/0x5f8 [ 26.934218] kunit_try_run_case+0x170/0x3f0 [ 26.934268] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 26.934321] kthread+0x328/0x630 [ 26.934373] ret_from_fork+0x10/0x20 [ 26.934448] [ 26.934469] Allocated by task 208: [ 26.934513] kasan_save_stack+0x3c/0x68 [ 26.935152] kasan_save_track+0x20/0x40 [ 26.935229] kasan_save_alloc_info+0x40/0x58 [ 26.935443] __kasan_kmalloc+0xd4/0xd8 [ 26.935599] __kmalloc_cache_noprof+0x16c/0x3c0 [ 26.935829] ksize_uaf+0xb8/0x5f8 [ 26.936157] kunit_try_run_case+0x170/0x3f0 [ 26.936381] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 26.936770] kthread+0x328/0x630 [ 26.936871] ret_from_fork+0x10/0x20 [ 26.936976] [ 26.937066] Freed by task 208: [ 26.937097] kasan_save_stack+0x3c/0x68 [ 26.937391] kasan_save_track+0x20/0x40 [ 26.937688] kasan_save_free_info+0x4c/0x78 [ 26.937843] __kasan_slab_free+0x6c/0x98 [ 26.938006] kfree+0x214/0x3c8 [ 26.938103] ksize_uaf+0x11c/0x5f8 [ 26.938311] kunit_try_run_case+0x170/0x3f0 [ 26.938553] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 26.938790] kthread+0x328/0x630 [ 26.938959] ret_from_fork+0x10/0x20 [ 26.939058] [ 26.939079] The buggy address belongs to the object at fff00000c7895300 [ 26.939079] which belongs to the cache kmalloc-128 of size 128 [ 26.939326] The buggy address is located 0 bytes inside of [ 26.939326] freed 128-byte region [fff00000c7895300, fff00000c7895380) [ 26.939642] [ 26.939730] The buggy address belongs to the physical page: [ 26.939899] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107895 [ 26.939955] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 26.940013] page_type: f5(slab) [ 26.940053] raw: 0bfffe0000000000 fff00000c0001a00 dead000000000122 0000000000000000 [ 26.940418] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 [ 26.940495] page dumped because: kasan: bad access detected [ 26.940673] [ 26.940919] Memory state around the buggy address: [ 26.941107] fff00000c7895200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.941292] fff00000c7895280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.941366] >fff00000c7895300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.941623] ^ [ 26.941823] fff00000c7895380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.941983] fff00000c7895400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.942089] ==================================================================
[ 22.358165] ================================================================== [ 22.359072] BUG: KASAN: slab-use-after-free in ksize_uaf+0x19d/0x6c0 [ 22.359366] Read of size 1 at addr ffff8881039c3700 by task kunit_try_catch/225 [ 22.359739] [ 22.359828] CPU: 1 UID: 0 PID: 225 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc3-next-20250625 #1 PREEMPT(voluntary) [ 22.359880] Tainted: [B]=BAD_PAGE, [N]=TEST [ 22.359892] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 22.359913] Call Trace: [ 22.359926] <TASK> [ 22.359954] dump_stack_lvl+0x73/0xb0 [ 22.359992] print_report+0xd1/0x650 [ 22.360013] ? __virt_addr_valid+0x1db/0x2d0 [ 22.360036] ? ksize_uaf+0x19d/0x6c0 [ 22.360054] ? kasan_complete_mode_report_info+0x64/0x200 [ 22.360078] ? ksize_uaf+0x19d/0x6c0 [ 22.360097] kasan_report+0x141/0x180 [ 22.360129] ? ksize_uaf+0x19d/0x6c0 [ 22.360159] ? ksize_uaf+0x19d/0x6c0 [ 22.360178] __kasan_check_byte+0x3d/0x50 [ 22.360209] ksize+0x20/0x60 [ 22.360232] ksize_uaf+0x19d/0x6c0 [ 22.360259] ? __pfx_ksize_uaf+0x10/0x10 [ 22.360278] ? __schedule+0x10cc/0x2b60 [ 22.360302] ? __pfx_read_tsc+0x10/0x10 [ 22.360339] ? ktime_get_ts64+0x86/0x230 [ 22.360364] kunit_try_run_case+0x1a5/0x480 [ 22.360395] ? __pfx_kunit_try_run_case+0x10/0x10 [ 22.360416] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 22.360561] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 22.360592] ? __kthread_parkme+0x82/0x180 [ 22.360612] ? preempt_count_sub+0x50/0x80 [ 22.360640] ? __pfx_kunit_try_run_case+0x10/0x10 [ 22.360662] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 22.360684] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 22.360705] kthread+0x337/0x6f0 [ 22.360723] ? trace_preempt_on+0x20/0xc0 [ 22.360745] ? __pfx_kthread+0x10/0x10 [ 22.360763] ? _raw_spin_unlock_irq+0x47/0x80 [ 22.360784] ? calculate_sigpending+0x7b/0xa0 [ 22.360806] ? __pfx_kthread+0x10/0x10 [ 22.360826] ret_from_fork+0x116/0x1d0 [ 22.360843] ? __pfx_kthread+0x10/0x10 [ 22.360862] ret_from_fork_asm+0x1a/0x30 [ 22.360890] </TASK> [ 22.360901] [ 22.369242] Allocated by task 225: [ 22.369400] kasan_save_stack+0x45/0x70 [ 22.369592] kasan_save_track+0x18/0x40 [ 22.369829] kasan_save_alloc_info+0x3b/0x50 [ 22.370219] __kasan_kmalloc+0xb7/0xc0 [ 22.370369] __kmalloc_cache_noprof+0x189/0x420 [ 22.370515] ksize_uaf+0xaa/0x6c0 [ 22.370627] kunit_try_run_case+0x1a5/0x480 [ 22.370819] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 22.371081] kthread+0x337/0x6f0 [ 22.371246] ret_from_fork+0x116/0x1d0 [ 22.371444] ret_from_fork_asm+0x1a/0x30 [ 22.371604] [ 22.371704] Freed by task 225: [ 22.371884] kasan_save_stack+0x45/0x70 [ 22.372073] kasan_save_track+0x18/0x40 [ 22.372335] kasan_save_free_info+0x3f/0x60 [ 22.372514] __kasan_slab_free+0x56/0x70 [ 22.372704] kfree+0x222/0x3f0 [ 22.372883] ksize_uaf+0x12c/0x6c0 [ 22.373228] kunit_try_run_case+0x1a5/0x480 [ 22.373433] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 22.373664] kthread+0x337/0x6f0 [ 22.373856] ret_from_fork+0x116/0x1d0 [ 22.374026] ret_from_fork_asm+0x1a/0x30 [ 22.374258] [ 22.374325] The buggy address belongs to the object at ffff8881039c3700 [ 22.374325] which belongs to the cache kmalloc-128 of size 128 [ 22.374666] The buggy address is located 0 bytes inside of [ 22.374666] freed 128-byte region [ffff8881039c3700, ffff8881039c3780) [ 22.375316] [ 22.375419] The buggy address belongs to the physical page: [ 22.375706] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1039c3 [ 22.376182] flags: 0x200000000000000(node=0|zone=2) [ 22.376354] page_type: f5(slab) [ 22.376467] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000 [ 22.376716] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 [ 22.377360] page dumped because: kasan: bad access detected [ 22.377610] [ 22.377677] Memory state around the buggy address: [ 22.377876] ffff8881039c3600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 22.378198] ffff8881039c3680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.378522] >ffff8881039c3700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 22.378809] ^ [ 22.379015] ffff8881039c3780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.379392] ffff8881039c3800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.379595] ================================================================== [ 22.380174] ================================================================== [ 22.380750] BUG: KASAN: slab-use-after-free in ksize_uaf+0x5fe/0x6c0 [ 22.381293] Read of size 1 at addr ffff8881039c3700 by task kunit_try_catch/225 [ 22.381541] [ 22.381655] CPU: 1 UID: 0 PID: 225 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc3-next-20250625 #1 PREEMPT(voluntary) [ 22.381697] Tainted: [B]=BAD_PAGE, [N]=TEST [ 22.381709] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 22.381740] Call Trace: [ 22.381753] <TASK> [ 22.381768] dump_stack_lvl+0x73/0xb0 [ 22.381791] print_report+0xd1/0x650 [ 22.381810] ? __virt_addr_valid+0x1db/0x2d0 [ 22.381882] ? ksize_uaf+0x5fe/0x6c0 [ 22.381914] ? kasan_complete_mode_report_info+0x64/0x200 [ 22.381947] ? ksize_uaf+0x5fe/0x6c0 [ 22.381968] kasan_report+0x141/0x180 [ 22.381988] ? ksize_uaf+0x5fe/0x6c0 [ 22.382011] __asan_report_load1_noabort+0x18/0x20 [ 22.382042] ksize_uaf+0x5fe/0x6c0 [ 22.382060] ? __pfx_ksize_uaf+0x10/0x10 [ 22.382079] ? __schedule+0x10cc/0x2b60 [ 22.382112] ? __pfx_read_tsc+0x10/0x10 [ 22.382133] ? ktime_get_ts64+0x86/0x230 [ 22.382155] kunit_try_run_case+0x1a5/0x480 [ 22.382179] ? __pfx_kunit_try_run_case+0x10/0x10 [ 22.382201] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 22.382230] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 22.382253] ? __kthread_parkme+0x82/0x180 [ 22.382271] ? preempt_count_sub+0x50/0x80 [ 22.382303] ? __pfx_kunit_try_run_case+0x10/0x10 [ 22.382325] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 22.382347] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 22.382377] kthread+0x337/0x6f0 [ 22.382395] ? trace_preempt_on+0x20/0xc0 [ 22.382415] ? __pfx_kthread+0x10/0x10 [ 22.382436] ? _raw_spin_unlock_irq+0x47/0x80 [ 22.382467] ? calculate_sigpending+0x7b/0xa0 [ 22.382489] ? __pfx_kthread+0x10/0x10 [ 22.382508] ret_from_fork+0x116/0x1d0 [ 22.382534] ? __pfx_kthread+0x10/0x10 [ 22.382553] ret_from_fork_asm+0x1a/0x30 [ 22.382581] </TASK> [ 22.382590] [ 22.390496] Allocated by task 225: [ 22.390650] kasan_save_stack+0x45/0x70 [ 22.390845] kasan_save_track+0x18/0x40 [ 22.391025] kasan_save_alloc_info+0x3b/0x50 [ 22.391289] __kasan_kmalloc+0xb7/0xc0 [ 22.391451] __kmalloc_cache_noprof+0x189/0x420 [ 22.391675] ksize_uaf+0xaa/0x6c0 [ 22.391793] kunit_try_run_case+0x1a5/0x480 [ 22.392102] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 22.392359] kthread+0x337/0x6f0 [ 22.392546] ret_from_fork+0x116/0x1d0 [ 22.392725] ret_from_fork_asm+0x1a/0x30 [ 22.392977] [ 22.393097] Freed by task 225: [ 22.393361] kasan_save_stack+0x45/0x70 [ 22.393566] kasan_save_track+0x18/0x40 [ 22.393763] kasan_save_free_info+0x3f/0x60 [ 22.393999] __kasan_slab_free+0x56/0x70 [ 22.394270] kfree+0x222/0x3f0 [ 22.394390] ksize_uaf+0x12c/0x6c0 [ 22.394502] kunit_try_run_case+0x1a5/0x480 [ 22.394634] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 22.394793] kthread+0x337/0x6f0 [ 22.395155] ret_from_fork+0x116/0x1d0 [ 22.395372] ret_from_fork_asm+0x1a/0x30 [ 22.395605] [ 22.395692] The buggy address belongs to the object at ffff8881039c3700 [ 22.395692] which belongs to the cache kmalloc-128 of size 128 [ 22.396267] The buggy address is located 0 bytes inside of [ 22.396267] freed 128-byte region [ffff8881039c3700, ffff8881039c3780) [ 22.396594] [ 22.396655] The buggy address belongs to the physical page: [ 22.396813] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1039c3 [ 22.397191] flags: 0x200000000000000(node=0|zone=2) [ 22.397506] page_type: f5(slab) [ 22.397845] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000 [ 22.398389] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 [ 22.398712] page dumped because: kasan: bad access detected [ 22.399064] [ 22.399138] Memory state around the buggy address: [ 22.399383] ffff8881039c3600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 22.399656] ffff8881039c3680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.399912] >ffff8881039c3700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 22.400431] ^ [ 22.400667] ffff8881039c3780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.401007] ffff8881039c3800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.401232] ================================================================== [ 22.402223] ================================================================== [ 22.402588] BUG: KASAN: slab-use-after-free in ksize_uaf+0x5e4/0x6c0 [ 22.402987] Read of size 1 at addr ffff8881039c3778 by task kunit_try_catch/225 [ 22.403386] [ 22.403469] CPU: 1 UID: 0 PID: 225 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc3-next-20250625 #1 PREEMPT(voluntary) [ 22.403512] Tainted: [B]=BAD_PAGE, [N]=TEST [ 22.403524] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 22.403544] Call Trace: [ 22.403558] <TASK> [ 22.403571] dump_stack_lvl+0x73/0xb0 [ 22.403594] print_report+0xd1/0x650 [ 22.403613] ? __virt_addr_valid+0x1db/0x2d0 [ 22.403633] ? ksize_uaf+0x5e4/0x6c0 [ 22.403651] ? kasan_complete_mode_report_info+0x64/0x200 [ 22.403675] ? ksize_uaf+0x5e4/0x6c0 [ 22.403693] kasan_report+0x141/0x180 [ 22.403713] ? ksize_uaf+0x5e4/0x6c0 [ 22.403735] __asan_report_load1_noabort+0x18/0x20 [ 22.403757] ksize_uaf+0x5e4/0x6c0 [ 22.403775] ? __pfx_ksize_uaf+0x10/0x10 [ 22.403794] ? __schedule+0x10cc/0x2b60 [ 22.403817] ? __pfx_read_tsc+0x10/0x10 [ 22.403837] ? ktime_get_ts64+0x86/0x230 [ 22.403860] kunit_try_run_case+0x1a5/0x480 [ 22.403883] ? __pfx_kunit_try_run_case+0x10/0x10 [ 22.403987] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 22.404007] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 22.404030] ? __kthread_parkme+0x82/0x180 [ 22.404060] ? preempt_count_sub+0x50/0x80 [ 22.404081] ? __pfx_kunit_try_run_case+0x10/0x10 [ 22.404103] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 22.404125] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 22.404147] kthread+0x337/0x6f0 [ 22.404165] ? trace_preempt_on+0x20/0xc0 [ 22.404186] ? __pfx_kthread+0x10/0x10 [ 22.404204] ? _raw_spin_unlock_irq+0x47/0x80 [ 22.404226] ? calculate_sigpending+0x7b/0xa0 [ 22.404247] ? __pfx_kthread+0x10/0x10 [ 22.404267] ret_from_fork+0x116/0x1d0 [ 22.404284] ? __pfx_kthread+0x10/0x10 [ 22.404302] ret_from_fork_asm+0x1a/0x30 [ 22.404335] </TASK> [ 22.404345] [ 22.412917] Allocated by task 225: [ 22.413054] kasan_save_stack+0x45/0x70 [ 22.413182] kasan_save_track+0x18/0x40 [ 22.413303] kasan_save_alloc_info+0x3b/0x50 [ 22.413497] __kasan_kmalloc+0xb7/0xc0 [ 22.413683] __kmalloc_cache_noprof+0x189/0x420 [ 22.413889] ksize_uaf+0xaa/0x6c0 [ 22.414057] kunit_try_run_case+0x1a5/0x480 [ 22.414300] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 22.414620] kthread+0x337/0x6f0 [ 22.414769] ret_from_fork+0x116/0x1d0 [ 22.415016] ret_from_fork_asm+0x1a/0x30 [ 22.415191] [ 22.415293] Freed by task 225: [ 22.415441] kasan_save_stack+0x45/0x70 [ 22.415682] kasan_save_track+0x18/0x40 [ 22.415885] kasan_save_free_info+0x3f/0x60 [ 22.416178] __kasan_slab_free+0x56/0x70 [ 22.416392] kfree+0x222/0x3f0 [ 22.416547] ksize_uaf+0x12c/0x6c0 [ 22.416723] kunit_try_run_case+0x1a5/0x480 [ 22.416926] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 22.417188] kthread+0x337/0x6f0 [ 22.417375] ret_from_fork+0x116/0x1d0 [ 22.417716] ret_from_fork_asm+0x1a/0x30 [ 22.418062] [ 22.418247] The buggy address belongs to the object at ffff8881039c3700 [ 22.418247] which belongs to the cache kmalloc-128 of size 128 [ 22.418746] The buggy address is located 120 bytes inside of [ 22.418746] freed 128-byte region [ffff8881039c3700, ffff8881039c3780) [ 22.419304] [ 22.419491] The buggy address belongs to the physical page: [ 22.419837] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1039c3 [ 22.420109] flags: 0x200000000000000(node=0|zone=2) [ 22.420258] page_type: f5(slab) [ 22.420375] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000 [ 22.420828] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 [ 22.421209] page dumped because: kasan: bad access detected [ 22.421597] [ 22.421764] Memory state around the buggy address: [ 22.422133] ffff8881039c3600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 22.422440] ffff8881039c3680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.422647] >ffff8881039c3700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 22.422857] ^ [ 22.423388] ffff8881039c3780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.423773] ffff8881039c3800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.424346] ==================================================================