================================================================== BUG: KASAN: slab-use-after-free in __lock_acquire+0x11c/0x7f70 kernel/locking/lockdep.c:5012 Read of size 8 at addr ffff88802243c580 by task syz-executor166/5181 CPU: 0 PID: 5181 Comm: syz-executor166 Not tainted 6.5.0-rc5-syzkaller-00362-ga785fd28d31f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0x163/0x540 mm/kasan/report.c:475 kasan_report+0x175/0x1b0 mm/kasan/report.c:588 __lock_acquire+0x11c/0x7f70 kernel/locking/lockdep.c:5012 lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5761 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 try_to_wake_up+0xb2/0x1160 kernel/sched/core.c:4229 call_timer_fn+0x178/0x580 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1751 [inline] __run_timers+0x64f/0x860 kernel/time/timer.c:2022 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2035 __do_softirq+0x2ab/0x908 kernel/softirq.c:553 invoke_softirq kernel/softirq.c:427 [inline] __irq_exit_rcu+0xf1/0x1b0 kernel/softirq.c:632 irq_exit_rcu+0x9/0x20 kernel/softirq.c:644 sysvec_apic_timer_interrupt+0x47/0xb0 arch/x86/kernel/apic/apic.c:1109 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0033:0x7f0248ad5b70 Code: 49 8b 47 10 48 39 f0 72 6e 48 63 cd 48 01 c1 49 39 4f 08 72 4c 8d 4d ff 85 ed 74 33 66 0f 1f 44 00 00 48 39 f0 72 1b 4d 8b 07 <49> 89 c1 49 29 f1 47 0f b6 0c 08 45 84 c9 74 08 45 88 0c 00 49 8b RSP: 002b:00007ffe4553a340 EFLAGS: 00000212 RAX: 0000000000052480 RBX: 00007ffe4553a3e0 RCX: 000000000000008b RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007ffe4553a480 RBP: 0000000000000102 R08: 00007f02406cc000 R09: 0000000000000000 R10: 0000000000000000 R11: 00007ffe4553a3f0 R12: 0000000000000001 R13: 00007f0248b551a0 R14: 0000000000000000 R15: 00007ffe4553a480 Allocated by task 5052: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x66/0x70 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook+0x6c/0x3b0 mm/slab.h:762 slab_alloc_node mm/slub.c:3470 [inline] kmem_cache_alloc_node+0x149/0x330 mm/slub.c:3515 alloc_task_struct_node kernel/fork.c:173 [inline] dup_task_struct+0x57/0x7d0 kernel/fork.c:1105 copy_process+0x5c8/0x4290 kernel/fork.c:2330 kernel_clone+0x222/0x800 kernel/fork.c:2912 __do_sys_clone kernel/fork.c:3055 [inline] __se_sys_clone kernel/fork.c:3039 [inline] __x64_sys_clone+0x258/0x2a0 kernel/fork.c:3039 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 5105: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1792 [inline] slab_free_freelist_hook mm/slub.c:1818 [inline] slab_free mm/slub.c:3801 [inline] kmem_cache_free+0x292/0x500 mm/slub.c:3823 rcu_do_batch kernel/rcu/tree.c:2135 [inline] rcu_core+0xaaa/0x1740 kernel/rcu/tree.c:2399 __do_softirq+0x2ab/0x908 kernel/softirq.c:553 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xad/0xc0 mm/kasan/generic.c:492 __call_rcu_common kernel/rcu/tree.c:2649 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:2763 put_task_struct_rcu_user kernel/exit.c:232 [inline] release_task+0x15ad/0x16f0 kernel/exit.c:282 wait_task_zombie kernel/exit.c:1210 [inline] wait_consider_task+0x1a43/0x2e20 kernel/exit.c:1437 do_wait_thread kernel/exit.c:1500 [inline] do_wait+0x312/0xb00 kernel/exit.c:1617 kernel_wait4+0x2a2/0x3e0 kernel/exit.c:1780 __do_sys_wait4 kernel/exit.c:1808 [inline] __se_sys_wait4 kernel/exit.c:1804 [inline] __x64_sys_wait4+0x134/0x1e0 kernel/exit.c:1804 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Second to last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xad/0xc0 mm/kasan/generic.c:492 task_work_add+0x8b/0x3a0 kernel/task_work.c:48 task_tick_mm_cid kernel/sched/core.c:11976 [inline] scheduler_tick+0x2e2/0x6d0 kernel/sched/core.c:5664 update_process_times+0x17f/0x1b0 kernel/time/timer.c:2076 tick_sched_handle kernel/time/tick-sched.c:254 [inline] tick_sched_timer+0x379/0x550 kernel/time/tick-sched.c:1492 __run_hrtimer kernel/time/hrtimer.c:1688 [inline] __hrtimer_run_queues+0x562/0xd10 kernel/time/hrtimer.c:1752 hrtimer_interrupt+0x396/0x980 kernel/time/hrtimer.c:1814 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1098 [inline] __sysvec_apic_timer_interrupt+0x13f/0x480 arch/x86/kernel/apic/apic.c:1115 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1109 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 The buggy address belongs to the object at ffff88802243bb80 which belongs to the cache task_struct of size 7360 The buggy address is located 2560 bytes inside of freed 7360-byte region [ffff88802243bb80, ffff88802243d840) The buggy address belongs to the physical page: page:ffffea0000890e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22438 head:ffffea0000890e00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000010200 ffff888014674500 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000040004 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 1133, tgid 1133 (kworker/u4:5), ts 7585628797, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1570 prep_new_page mm/page_alloc.c:1577 [inline] get_page_from_freelist+0x31e8/0x3370 mm/page_alloc.c:3221 __alloc_pages+0x255/0x670 mm/page_alloc.c:4477 alloc_slab_page+0x6a/0x160 mm/slub.c:1862 allocate_slab mm/slub.c:2009 [inline] new_slab+0x84/0x2f0 mm/slub.c:2062 ___slab_alloc+0xade/0x1100 mm/slub.c:3215 __slab_alloc mm/slub.c:3314 [inline] __slab_alloc_node mm/slub.c:3367 [inline] slab_alloc_node mm/slub.c:3460 [inline] kmem_cache_alloc_node+0x1e2/0x330 mm/slub.c:3515 alloc_task_struct_node kernel/fork.c:173 [inline] dup_task_struct+0x57/0x7d0 kernel/fork.c:1105 copy_process+0x5c8/0x4290 kernel/fork.c:2330 kernel_clone+0x222/0x800 kernel/fork.c:2912 user_mode_thread+0x132/0x190 kernel/fork.c:2990 call_usermodehelper_exec_work+0x5c/0x220 kernel/umh.c:172 process_one_work+0x92c/0x12c0 kernel/workqueue.c:2600 worker_thread+0xa63/0x1210 kernel/workqueue.c:2751 kthread+0x2b8/0x350 kernel/kthread.c:389 ret_from_fork+0x2e/0x60 arch/x86/kernel/process.c:145 page_owner free stack trace missing Memory state around the buggy address: ffff88802243c480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802243c500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802243c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802243c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802243c680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================