================================================================== BUG: KASAN: slab-use-after-free in __update_min_deadline kernel/sched/fair.c:805 [inline] BUG: KASAN: slab-use-after-free in min_deadline_update kernel/sched/fair.c:819 [inline] BUG: KASAN: slab-use-after-free in min_deadline_cb_propagate kernel/sched/fair.c:825 [inline] BUG: KASAN: slab-use-after-free in reweight_entity+0x8e3/0xa60 kernel/sched/fair.c:3660 Read of size 8 at addr ffff888024dabc30 by task syz-executor.0/17710 CPU: 0 PID: 17710 Comm: syz-executor.0 Not tainted 6.6.0-rc6-syzkaller-00217-gcd8892c07876 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 __update_min_deadline kernel/sched/fair.c:805 [inline] min_deadline_update kernel/sched/fair.c:819 [inline] min_deadline_cb_propagate kernel/sched/fair.c:825 [inline] reweight_entity+0x8e3/0xa60 kernel/sched/fair.c:3660 entity_tick kernel/sched/fair.c:5317 [inline] task_tick_fair+0xee/0xcd0 kernel/sched/fair.c:12392 scheduler_tick+0x210/0x650 kernel/sched/core.c:5657 update_process_times+0x19f/0x220 kernel/time/timer.c:2076 tick_sched_handle+0x8e/0x170 kernel/time/tick-sched.c:254 tick_sched_timer+0xe9/0x110 kernel/time/tick-sched.c:1492 __run_hrtimer kernel/time/hrtimer.c:1688 [inline] __hrtimer_run_queues+0x647/0xc10 kernel/time/hrtimer.c:1752 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1063 [inline] __sysvec_apic_timer_interrupt+0x105/0x3f0 arch/x86/kernel/apic/apic.c:1080 sysvec_apic_timer_interrupt+0x42/0xc0 arch/x86/kernel/apic/apic.c:1074 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:mod_objcg_state+0x423/0x9e0 mm/memcontrol.c:3224 Code: 00 00 00 00 48 89 df 48 8d 35 00 00 00 00 e8 94 b6 82 ff 48 83 7c 24 08 00 0f 85 86 01 00 00 9c 58 f6 c4 02 0f 85 62 03 00 00 <4d> 85 f6 0f 84 63 01 00 00 48 83 c4 20 4c 89 f7 5b 5d 41 5c 41 5d RSP: 0018:ffffc90000007cf8 EFLAGS: 00000246 RAX: 0000000000000006 RBX: ffff8880b98380a0 RCX: 1ffffffff2341210 RDX: 0000000000000000 RSI: ffffffff8a8caca0 RDI: ffffffff8ae93420 RBP: ffff8880b98380c8 R08: 0000000000000001 R09: fffffbfff23389e4 R10: ffffffff919c4f27 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8880b98380a0 R14: 0000000000000000 R15: ffff8880b98380f8 memcg_slab_free_hook mm/slab.h:572 [inline] slab_free mm/slub.c:3804 [inline] __kmem_cache_free+0x267/0x2f0 mm/slub.c:3822 security_cred_free+0xc3/0x130 security/security.c:2934 put_cred_rcu+0x126/0x520 kernel/cred.c:118 rcu_do_batch kernel/rcu/tree.c:2139 [inline] rcu_core+0x805/0x1bb0 kernel/rcu/tree.c:2403 __do_softirq+0x218/0x965 kernel/softirq.c:553 invoke_softirq kernel/softirq.c:427 [inline] __irq_exit_rcu kernel/softirq.c:632 [inline] irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1074 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:is_bpf_text_address+0x5/0x1a0 kernel/bpf/core.c:726 Code: 00 e9 1e fe ff ff 4c 89 ef e8 47 ac 47 00 e9 87 fe ff ff 4c 89 e7 e8 3a ac 47 00 e9 49 fe ff ff 0f 1f 44 00 00 66 0f 1f 00 55 <48> 89 fd 53 e8 82 d4 f1 ff e8 3d 65 da ff 45 31 c9 45 31 c0 31 d2 RSP: 0018:ffffc9000c967548 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 00007fbfedc7cae9 RCX: ffffc90005129000 RDX: 0000000000040000 RSI: ffffffff8174b165 RDI: 00007fbfedc7cae9 RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: 0000000000000000 R12: ffffc9000c9675f0 R13: ffffffff81758040 R14: ffffc9000c967668 R15: ffff8880193f5940 kernel_text_address kernel/extable.c:125 [inline] kernel_text_address+0x85/0xf0 kernel/extable.c:94 __kernel_text_address+0xd/0x30 kernel/extable.c:79 unwind_get_return_address+0x78/0xe0 arch/x86/kernel/unwind_orc.c:369 arch_stack_walk+0xbe/0x170 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x96/0xd0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x81/0x90 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook mm/slab.h:762 [inline] slab_alloc_node mm/slub.c:3478 [inline] slab_alloc mm/slub.c:3486 [inline] __kmem_cache_alloc_lru mm/slub.c:3493 [inline] kmem_cache_alloc+0x16c/0x3b0 mm/slub.c:3502 vma_lock_alloc kernel/fork.c:459 [inline] vm_area_dup+0x53/0x2f0 kernel/fork.c:512 dup_mmap+0x93c/0x1d80 kernel/fork.c:710 dup_mm kernel/fork.c:1686 [inline] copy_mm kernel/fork.c:1735 [inline] copy_process+0x6bff/0x73f0 kernel/fork.c:2501 kernel_clone+0xfd/0x920 kernel/fork.c:2909 __do_sys_clone+0xba/0x100 kernel/fork.c:3052 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fbfedc7cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbfee95a078 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fbfedd9bf80 RCX: 00007fbfedc7cae9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fbfedcc847a R08: 00000000200003c0 R09: 00000000200003c0 R10: 0000000020000380 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fbfedd9bf80 R15: 00007fff238bcb38 Allocated by task 4489: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x81/0x90 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook mm/slab.h:762 [inline] slab_alloc_node mm/slub.c:3478 [inline] kmem_cache_alloc_node+0x180/0x3f0 mm/slub.c:3523 alloc_task_struct_node kernel/fork.c:173 [inline] dup_task_struct kernel/fork.c:1110 [inline] copy_process+0x41c/0x73f0 kernel/fork.c:2327 kernel_clone+0xfd/0x920 kernel/fork.c:2909 __do_sys_clone+0xba/0x100 kernel/fork.c:3052 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 11073: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x15b/0x1b0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1800 [inline] slab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1826 slab_free mm/slub.c:3809 [inline] kmem_cache_free+0xf0/0x480 mm/slub.c:3831 put_task_struct include/linux/sched/task.h:136 [inline] put_task_struct include/linux/sched/task.h:123 [inline] delayed_put_task_struct+0x21b/0x2b0 kernel/exit.c:226 rcu_do_batch kernel/rcu/tree.c:2139 [inline] rcu_core+0x805/0x1bb0 kernel/rcu/tree.c:2403 __do_softirq+0x218/0x965 kernel/softirq.c:553 Last potentially related work creation: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:492 __call_rcu_common.constprop.0+0x9a/0x790 kernel/rcu/tree.c:2653 put_task_struct_rcu_user kernel/exit.c:232 [inline] put_task_struct_rcu_user+0x87/0xc0 kernel/exit.c:229 context_switch kernel/sched/core.c:5385 [inline] __schedule+0xee9/0x5a10 kernel/sched/core.c:6695 schedule+0xe7/0x1b0 kernel/sched/core.c:6771 toggle_allocation_gate mm/kfence/core.c:832 [inline] toggle_allocation_gate+0x1d3/0x250 mm/kfence/core.c:822 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784 kthread+0x33c/0x440 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Second to last potentially related work creation: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:492 __call_rcu_common.constprop.0+0x9a/0x790 kernel/rcu/tree.c:2653 put_task_struct_rcu_user kernel/exit.c:232 [inline] put_task_struct_rcu_user+0x87/0xc0 kernel/exit.c:229 release_task+0xef7/0x1b70 kernel/exit.c:282 wait_task_zombie kernel/exit.c:1210 [inline] wait_consider_task+0x17b5/0x4000 kernel/exit.c:1437 do_wait_thread kernel/exit.c:1500 [inline] do_wait+0x72a/0xc70 kernel/exit.c:1617 kernel_wait4+0x16d/0x280 kernel/exit.c:1780 __do_sys_wait4+0x15b/0x170 kernel/exit.c:1808 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888024dabb80 which belongs to the cache task_struct of size 7360 The buggy address is located 176 bytes inside of freed 7360-byte region [ffff888024dabb80, ffff888024dad840) The buggy address belongs to the physical page: page:ffffea0000936a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x24da8 head:ffffea0000936a00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff8880680e3b41 ksm flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888014e43500 ffffea0000d22800 dead000000000003 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff8880680e3b41 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 26205672383, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1536 prep_new_page mm/page_alloc.c:1543 [inline] get_page_from_freelist+0xee0/0x2f20 mm/page_alloc.c:3170 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4426 alloc_pages+0x1a9/0x270 mm/mempolicy.c:2297 alloc_slab_page mm/slub.c:1870 [inline] allocate_slab+0x251/0x380 mm/slub.c:2017 new_slab mm/slub.c:2070 [inline] ___slab_alloc+0x8c7/0x1580 mm/slub.c:3223 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3322 __slab_alloc_node mm/slub.c:3375 [inline] slab_alloc_node mm/slub.c:3468 [inline] kmem_cache_alloc_node+0x132/0x3f0 mm/slub.c:3523 alloc_task_struct_node kernel/fork.c:173 [inline] dup_task_struct kernel/fork.c:1110 [inline] copy_process+0x41c/0x73f0 kernel/fork.c:2327 kernel_clone+0xfd/0x920 kernel/fork.c:2909 kernel_thread+0xc0/0x100 kernel/fork.c:2971 create_kthread kernel/kthread.c:411 [inline] kthreadd+0x4fb/0x7d0 kernel/kthread.c:746 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 page_owner free stack trace missing Memory state around the buggy address: ffff888024dabb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888024dabb80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888024dabc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888024dabc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888024dabd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 00 add %al,(%rax) 4: 48 89 df mov %rbx,%rdi 7: 48 8d 35 00 00 00 00 lea 0x0(%rip),%rsi # 0xe e: e8 94 b6 82 ff call 0xff82b6a7 13: 48 83 7c 24 08 00 cmpq $0x0,0x8(%rsp) 19: 0f 85 86 01 00 00 jne 0x1a5 1f: 9c pushf 20: 58 pop %rax 21: f6 c4 02 test $0x2,%ah 24: 0f 85 62 03 00 00 jne 0x38c * 2a: 4d 85 f6 test %r14,%r14 <-- trapping instruction 2d: 0f 84 63 01 00 00 je 0x196 33: 48 83 c4 20 add $0x20,%rsp 37: 4c 89 f7 mov %r14,%rdi 3a: 5b pop %rbx 3b: 5d pop %rbp 3c: 41 5c pop %r12 3e: 41 5d pop %r13