Date
July 16, 2025, 12:11 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 31.928334] ================================================================== [ 31.929013] BUG: KASAN: slab-use-after-free in kmem_cache_rcu_uaf+0x388/0x468 [ 31.929245] Read of size 1 at addr fff00000c9b0e000 by task kunit_try_catch/244 [ 31.930286] [ 31.930585] CPU: 0 UID: 0 PID: 244 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6-next-20250716 #1 PREEMPT [ 31.931570] Tainted: [B]=BAD_PAGE, [N]=TEST [ 31.931619] Hardware name: linux,dummy-virt (DT) [ 31.931664] Call trace: [ 31.931690] show_stack+0x20/0x38 (C) [ 31.931746] dump_stack_lvl+0x8c/0xd0 [ 31.931800] print_report+0x118/0x5d0 [ 31.931843] kasan_report+0xdc/0x128 [ 31.931885] __asan_report_load1_noabort+0x20/0x30 [ 31.931935] kmem_cache_rcu_uaf+0x388/0x468 [ 31.931984] kunit_try_run_case+0x170/0x3f0 [ 31.932036] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.932090] kthread+0x328/0x630 [ 31.934603] ret_from_fork+0x10/0x20 [ 31.934970] [ 31.934992] Allocated by task 244: [ 31.935716] kasan_save_stack+0x3c/0x68 [ 31.936198] kasan_save_track+0x20/0x40 [ 31.937011] kasan_save_alloc_info+0x40/0x58 [ 31.937061] __kasan_slab_alloc+0xa8/0xb0 [ 31.937097] kmem_cache_alloc_noprof+0x10c/0x398 [ 31.937722] kmem_cache_rcu_uaf+0x12c/0x468 [ 31.937775] kunit_try_run_case+0x170/0x3f0 [ 31.938391] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.938914] kthread+0x328/0x630 [ 31.939393] ret_from_fork+0x10/0x20 [ 31.939663] [ 31.939683] Freed by task 0: [ 31.939714] kasan_save_stack+0x3c/0x68 [ 31.939954] kasan_save_track+0x20/0x40 [ 31.939996] kasan_save_free_info+0x4c/0x78 [ 31.940800] __kasan_slab_free+0x6c/0x98 [ 31.940923] slab_free_after_rcu_debug+0xd4/0x2f8 [ 31.941988] rcu_core+0x9f4/0x1e20 [ 31.942399] rcu_core_si+0x18/0x30 [ 31.942792] handle_softirqs+0x374/0xb28 [ 31.943520] __do_softirq+0x1c/0x28 [ 31.943832] [ 31.943858] Last potentially related work creation: [ 31.943898] kasan_save_stack+0x3c/0x68 [ 31.943939] kasan_record_aux_stack+0xb4/0xc8 [ 31.944759] kmem_cache_free+0x120/0x468 [ 31.945050] kmem_cache_rcu_uaf+0x16c/0x468 [ 31.945584] kunit_try_run_case+0x170/0x3f0 [ 31.946059] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.946460] kthread+0x328/0x630 [ 31.946819] ret_from_fork+0x10/0x20 [ 31.946925] [ 31.946945] The buggy address belongs to the object at fff00000c9b0e000 [ 31.946945] which belongs to the cache test_cache of size 200 [ 31.947307] The buggy address is located 0 bytes inside of [ 31.947307] freed 200-byte region [fff00000c9b0e000, fff00000c9b0e0c8) [ 31.947405] [ 31.947434] The buggy address belongs to the physical page: [ 31.947480] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109b0e [ 31.948534] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 31.948599] page_type: f5(slab) [ 31.948772] raw: 0bfffe0000000000 fff00000c56a1b40 dead000000000122 0000000000000000 [ 31.949129] raw: 0000000000000000 00000000800f000f 00000000f5000000 0000000000000000 [ 31.949339] page dumped because: kasan: bad access detected [ 31.949758] [ 31.949785] Memory state around the buggy address: [ 31.949848] fff00000c9b0df00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 31.950196] fff00000c9b0df80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 31.950453] >fff00000c9b0e000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.950738] ^ [ 31.950810] fff00000c9b0e080: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc [ 31.950855] fff00000c9b0e100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.951349] ==================================================================
[ 24.092059] ================================================================== [ 24.092581] BUG: KASAN: slab-use-after-free in kmem_cache_rcu_uaf+0x3e3/0x510 [ 24.093004] Read of size 1 at addr ffff88810608a000 by task kunit_try_catch/262 [ 24.093691] [ 24.093800] CPU: 1 UID: 0 PID: 262 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6-next-20250716 #1 PREEMPT(voluntary) [ 24.093858] Tainted: [B]=BAD_PAGE, [N]=TEST [ 24.093870] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 24.093893] Call Trace: [ 24.093908] <TASK> [ 24.093927] dump_stack_lvl+0x73/0xb0 [ 24.093962] print_report+0xd1/0x610 [ 24.093986] ? __virt_addr_valid+0x1db/0x2d0 [ 24.094297] ? kmem_cache_rcu_uaf+0x3e3/0x510 [ 24.094322] ? kasan_complete_mode_report_info+0x64/0x200 [ 24.094349] ? kmem_cache_rcu_uaf+0x3e3/0x510 [ 24.094372] kasan_report+0x141/0x180 [ 24.094394] ? kmem_cache_rcu_uaf+0x3e3/0x510 [ 24.094422] __asan_report_load1_noabort+0x18/0x20 [ 24.094446] kmem_cache_rcu_uaf+0x3e3/0x510 [ 24.094472] ? __pfx_kmem_cache_rcu_uaf+0x10/0x10 [ 24.094495] ? finish_task_switch.isra.0+0x153/0x700 [ 24.094518] ? __switch_to+0x47/0xf80 [ 24.094548] ? __pfx_read_tsc+0x10/0x10 [ 24.094585] ? ktime_get_ts64+0x86/0x230 [ 24.094611] kunit_try_run_case+0x1a5/0x480 [ 24.094637] ? __pfx_kunit_try_run_case+0x10/0x10 [ 24.094659] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 24.094684] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 24.094706] ? __kthread_parkme+0x82/0x180 [ 24.094728] ? preempt_count_sub+0x50/0x80 [ 24.094749] ? __pfx_kunit_try_run_case+0x10/0x10 [ 24.094772] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 24.094800] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 24.094826] kthread+0x337/0x6f0 [ 24.094845] ? trace_preempt_on+0x20/0xc0 [ 24.094898] ? __pfx_kthread+0x10/0x10 [ 24.094918] ? _raw_spin_unlock_irq+0x47/0x80 [ 24.094939] ? calculate_sigpending+0x7b/0xa0 [ 24.094965] ? __pfx_kthread+0x10/0x10 [ 24.094986] ret_from_fork+0x116/0x1d0 [ 24.095006] ? __pfx_kthread+0x10/0x10 [ 24.095026] ret_from_fork_asm+0x1a/0x30 [ 24.095059] </TASK> [ 24.095071] [ 24.104844] Allocated by task 262: [ 24.105355] kasan_save_stack+0x45/0x70 [ 24.105536] kasan_save_track+0x18/0x40 [ 24.105761] kasan_save_alloc_info+0x3b/0x50 [ 24.106152] __kasan_slab_alloc+0x91/0xa0 [ 24.106368] kmem_cache_alloc_noprof+0x123/0x3f0 [ 24.106571] kmem_cache_rcu_uaf+0x155/0x510 [ 24.106782] kunit_try_run_case+0x1a5/0x480 [ 24.107266] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 24.107499] kthread+0x337/0x6f0 [ 24.107783] ret_from_fork+0x116/0x1d0 [ 24.107977] ret_from_fork_asm+0x1a/0x30 [ 24.108477] [ 24.108564] Freed by task 0: [ 24.108733] kasan_save_stack+0x45/0x70 [ 24.108907] kasan_save_track+0x18/0x40 [ 24.109390] kasan_save_free_info+0x3f/0x60 [ 24.109579] __kasan_slab_free+0x56/0x70 [ 24.109777] slab_free_after_rcu_debug+0xe4/0x310 [ 24.109981] rcu_core+0x66f/0x1c40 [ 24.110379] rcu_core_si+0x12/0x20 [ 24.110534] handle_softirqs+0x209/0x730 [ 24.110867] __irq_exit_rcu+0xc9/0x110 [ 24.111172] irq_exit_rcu+0x12/0x20 [ 24.111375] sysvec_apic_timer_interrupt+0x81/0x90 [ 24.111573] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 24.111956] [ 24.112054] Last potentially related work creation: [ 24.112245] kasan_save_stack+0x45/0x70 [ 24.112435] kasan_record_aux_stack+0xb2/0xc0 [ 24.113046] kmem_cache_free+0x131/0x420 [ 24.113203] kmem_cache_rcu_uaf+0x194/0x510 [ 24.113584] kunit_try_run_case+0x1a5/0x480 [ 24.113767] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 24.114184] kthread+0x337/0x6f0 [ 24.114358] ret_from_fork+0x116/0x1d0 [ 24.114703] ret_from_fork_asm+0x1a/0x30 [ 24.115004] [ 24.115089] The buggy address belongs to the object at ffff88810608a000 [ 24.115089] which belongs to the cache test_cache of size 200 [ 24.115845] The buggy address is located 0 bytes inside of [ 24.115845] freed 200-byte region [ffff88810608a000, ffff88810608a0c8) [ 24.116490] [ 24.116733] The buggy address belongs to the physical page: [ 24.116951] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10608a [ 24.117327] flags: 0x200000000000000(node=0|zone=2) [ 24.117575] page_type: f5(slab) [ 24.117732] raw: 0200000000000000 ffff888106085280 dead000000000122 0000000000000000 [ 24.118483] raw: 0000000000000000 00000000800f000f 00000000f5000000 0000000000000000 [ 24.118983] page dumped because: kasan: bad access detected [ 24.119249] [ 24.119352] Memory state around the buggy address: [ 24.119768] ffff888106089f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.120241] ffff888106089f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.120637] >ffff88810608a000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.120918] ^ [ 24.121292] ffff88810608a080: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc [ 24.121721] ffff88810608a100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.122159] ==================================================================