================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:176 [inline] BUG: KASAN: use-after-free in __refcount_sub_and_test include/linux/refcount.h:272 [inline] BUG: KASAN: use-after-free in __refcount_dec_and_test include/linux/refcount.h:315 [inline] BUG: KASAN: use-after-free in refcount_dec_and_test include/linux/refcount.h:333 [inline] BUG: KASAN: use-after-free in put_task_stack+0x2a/0x220 kernel/fork.c:533 Write of size 4 at addr ffff88810cea1bc0 by task kworker/0:2/53 CPU: 0 PID: 53 Comm: kworker/0:2 Tainted: G W 5.18.0-syzkaller-01161-gcb93b3201ead #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: rcu_gp wait_rcu_exp_gp Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:313 [inline] print_report+0x15f/0x620 mm/kasan/report.c:429 kasan_report+0xe6/0x110 mm/kasan/report.c:491 kasan_check_range+0x2aa/0x2e0 mm/kasan/generic.c:189 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:176 [inline] __refcount_sub_and_test include/linux/refcount.h:272 [inline] __refcount_dec_and_test include/linux/refcount.h:315 [inline] refcount_dec_and_test include/linux/refcount.h:333 [inline] put_task_stack+0x2a/0x220 kernel/fork.c:533 sched_show_task+0x380/0x520 kernel/sched/core.c:8732 dump_cpu_task+0x73/0x90 kernel/sched/core.c:11046 synchronize_rcu_expedited_wait+0xc17/0x1310 kernel/rcu/tree_exp.h:668 rcu_exp_wait_wake kernel/rcu/tree_exp.h:685 [inline] rcu_exp_sel_wait_wake+0x4c9/0x8a0 kernel/rcu/tree_exp.h:719 wait_rcu_exp_gp+0x33/0x40 kernel/rcu/tree_exp.h:510 process_one_work+0x6cb/0xbf0 kernel/workqueue.c:2289 worker_thread+0xb3c/0x1390 kernel/workqueue.c:2436 kthread+0x26b/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 Allocated by task 453: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] __kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:469 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:749 [inline] slab_alloc_node mm/slub.c:3217 [inline] slab_alloc mm/slub.c:3225 [inline] __kmem_cache_alloc_lru mm/slub.c:3232 [inline] kmem_cache_alloc+0x192/0x300 mm/slub.c:3242 kmem_cache_alloc_node include/linux/slab.h:453 [inline] alloc_task_struct_node kernel/fork.c:172 [inline] dup_task_struct+0x54/0x4a0 kernel/fork.c:971 copy_process+0x582/0x34c0 kernel/fork.c:2073 kernel_clone+0x224/0x8d0 kernel/fork.c:2644 __do_sys_clone kernel/fork.c:2761 [inline] __se_sys_clone kernel/fork.c:2745 [inline] __x64_sys_clone+0x289/0x310 kernel/fork.c:2745 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2f/0x50 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Freed by task 20: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x133/0x170 mm/kasan/common.c:366 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0xc9/0x1a0 mm/slub.c:1754 slab_free mm/slub.c:3510 [inline] kmem_cache_free+0x110/0x2d0 mm/slub.c:3527 free_task_struct kernel/fork.c:177 [inline] free_task kernel/fork.c:561 [inline] __put_task_struct+0x32b/0x4d0 kernel/fork.c:850 put_task_struct include/linux/sched/task.h:115 [inline] delayed_put_task_struct+0x5c/0x180 kernel/exit.c:177 rcu_do_batch+0x507/0xbc0 kernel/rcu/tree.c:2578 rcu_core+0x4dc/0xef0 kernel/rcu/tree.c:2838 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2855 __do_softirq+0x24e/0x586 kernel/softirq.c:558 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xb3/0xc0 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 call_rcu+0xf9/0x1390 kernel/rcu/tree.c:3126 put_task_struct_rcu_user+0x58/0xa0 kernel/exit.c:183 finish_task_switch+0x34a/0x700 kernel/sched/core.c:4987 context_switch kernel/sched/core.c:5076 [inline] __schedule+0xb2a/0x1020 kernel/sched/core.c:6388 preempt_schedule_common+0xa7/0x100 kernel/sched/core.c:6553 preempt_schedule+0xd9/0xe0 kernel/sched/core.c:6577 preempt_schedule_thunk+0x16/0x18 on_each_cpu_cond_mask+0x78/0x80 kernel/smp.c:1139 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:1184 [inline] text_poke_bp_batch+0x504/0x740 arch/x86/kernel/alternative.c:1425 text_poke_flush arch/x86/kernel/alternative.c:1542 [inline] text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:1549 arch_jump_label_transform_apply+0x15/0x30 arch/x86/kernel/jump_label.c:146 __jump_label_update+0x37e/0x3a0 kernel/jump_label.c:459 jump_label_update+0x3bc/0x450 kernel/jump_label.c:830 static_key_enable_cpuslocked+0x12a/0x250 kernel/jump_label.c:177 static_key_enable+0x1a/0x30 kernel/jump_label.c:190 toggle_allocation_gate+0xbf/0x450 mm/kfence/core.c:774 process_one_work+0x6cb/0xbf0 kernel/workqueue.c:2289 worker_thread+0xb3c/0x1390 kernel/workqueue.c:2436 kthread+0x26b/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xb3/0xc0 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 call_rcu+0xf9/0x1390 kernel/rcu/tree.c:3126 put_task_struct_rcu_user+0x58/0xa0 kernel/exit.c:183 finish_task_switch+0x34a/0x700 kernel/sched/core.c:4987 context_switch kernel/sched/core.c:5076 [inline] __schedule+0xb2a/0x1020 kernel/sched/core.c:6388 schedule_idle+0x50/0x90 kernel/sched/core.c:6488 do_idle+0x583/0x5e0 kernel/sched/idle.c:331 cpu_startup_entry+0x25/0x30 kernel/sched/idle.c:400 start_secondary+0xe3/0xf0 arch/x86/kernel/smpboot.c:266 secondary_startup_64_no_verify+0xce/0xdb The buggy address belongs to the object at ffff88810cea10c0 which belongs to the cache task_struct of size 4032 The buggy address is located 2816 bytes inside of 4032-byte region [ffff88810cea10c0, ffff88810cea2080) The buggy address belongs to the physical page: page:ffffea000433a800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10cea0 head:ffffea000433a800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x8000000000010200(slab|head|zone=2) raw: 8000000000010200 ffffea00042a5000 dead000000000002 ffff888100132280 raw: 0000000000000000 0000000080070007 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2, tgid 2 (kthreadd), ts 2422520428, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x15b/0x160 mm/page_alloc.c:2434 prep_new_page mm/page_alloc.c:2441 [inline] get_page_from_freelist+0x3f6/0x8b0 mm/page_alloc.c:4182 __alloc_pages+0x3bd/0x850 mm/page_alloc.c:5408 allocate_slab+0x69/0x4d0 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0x2c2/0x6a0 mm/slub.c:3005 __slab_alloc+0x4a/0x90 mm/slub.c:3092 slab_alloc_node mm/slub.c:3183 [inline] slab_alloc mm/slub.c:3225 [inline] __kmem_cache_alloc_lru mm/slub.c:3232 [inline] kmem_cache_alloc+0x20e/0x300 mm/slub.c:3242 kmem_cache_alloc_node include/linux/slab.h:453 [inline] alloc_task_struct_node kernel/fork.c:172 [inline] dup_task_struct+0x54/0x4a0 kernel/fork.c:971 copy_process+0x582/0x34c0 kernel/fork.c:2073 kernel_clone+0x224/0x8d0 kernel/fork.c:2644 kernel_thread+0x167/0x1e0 kernel/fork.c:2696 create_kthread kernel/kthread.c:399 [inline] kthreadd+0x38d/0x4e0 kernel/kthread.c:745 ret_from_fork+0x1f/0x30 page_owner free stack trace missing Memory state around the buggy address: ffff88810cea1a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88810cea1b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88810cea1b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88810cea1c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88810cea1c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================