================================================================== 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 ffff88801fb9bc30 by task syz-executor.5/6218 CPU: 0 PID: 6218 Comm: syz-executor.5 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:__orc_find+0xb5/0x130 arch/x86/kernel/unwind_orc.c:102 Code: 48 01 d0 48 d1 f8 4c 8d 3c 83 4c 89 fa 48 c1 ea 03 42 0f b6 0c 32 4c 89 fa 83 e2 07 83 c2 03 38 ca 7c 04 84 c9 75 6f 49 63 17 <4c> 89 e7 4d 8d 2c 17 4c 89 ee e8 1c 89 4d 00 4d 39 ec 73 95 e8 02 RSP: 0018:ffffc900000075a8 EFLAGS: 00000246 RAX: 0000000000000009 RBX: ffffffff8f49bda0 RCX: 0000000000000000 RDX: fffffffffaf40579 RSI: ffffffff813a4b9a RDI: 0000000000000005 RBP: ffffffff8f49bde8 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000013 R11: 5050505000000011 R12: ffffffff8a3dc302 R13: ffffffff8ff947bc R14: dffffc0000000000 R15: ffffffff8f49bdc4 orc_find arch/x86/kernel/unwind_orc.c:227 [inline] unwind_next_frame+0x329/0x2390 arch/x86/kernel/unwind_orc.c:494 arch_stack_walk+0xfa/0x170 arch/x86/kernel/stacktrace.c:25 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] kmem_cache_alloc_node+0x180/0x3f0 mm/slub.c:3523 __alloc_skb+0x287/0x330 net/core/skbuff.c:640 skb_copy+0x12d/0x3c0 net/core/skbuff.c:1976 mac80211_hwsim_tx_frame_no_nl.isra.0+0xb94/0x1300 drivers/net/wireless/virtual/mac80211_hwsim.c:1835 mac80211_hwsim_tx_frame+0x1eb/0x2a0 drivers/net/wireless/virtual/mac80211_hwsim.c:2171 mac80211_hwsim_beacon_tx+0x41b/0x730 drivers/net/wireless/virtual/mac80211_hwsim.c:2264 __iterate_interfaces+0x2d2/0x580 net/mac80211/util.c:766 ieee80211_iterate_active_interfaces_atomic+0x71/0x1b0 net/mac80211/util.c:802 mac80211_hwsim_beacon+0x101/0x200 drivers/net/wireless/virtual/mac80211_hwsim.c:2290 __run_hrtimer kernel/time/hrtimer.c:1688 [inline] __hrtimer_run_queues+0x203/0xc10 kernel/time/hrtimer.c:1752 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1769 __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:check_kcov_mode kernel/kcov.c:173 [inline] RIP: 0010:write_comp_data+0xa/0x90 kernel/kcov.c:236 Code: 01 ff 00 75 10 65 48 8b 04 25 c0 bc 03 00 48 8b 80 f8 15 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 65 8b 05 b1 e8 7b 7e 49 89 f1 <89> c6 49 89 d2 81 e6 00 01 00 00 49 89 f8 65 48 8b 14 25 c0 bc 03 RSP: 0018:ffffc9000530f668 EFLAGS: 00000246 RAX: 0000000080000001 RBX: ffffea0001f05d80 RCX: ffffffff81e86053 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 1ffffffff1976ca1 R12: ffff888016d26930 R13: 0000000000000001 R14: ffffea0001f05d88 R15: 0000000000000000 _compound_head include/linux/page-flags.h:249 [inline] PageSlab include/linux/page-flags.h:481 [inline] page_table_check_clear mm/page_table_check.c:74 [inline] page_table_check_clear+0x1e3/0x9a0 mm/page_table_check.c:61 __page_table_check_pte_clear+0xef/0x100 mm/page_table_check.c:158 page_table_check_pte_clear include/linux/page_table_check.h:49 [inline] ptep_get_and_clear_full arch/x86/include/asm/pgtable.h:1301 [inline] zap_pte_range mm/memory.c:1431 [inline] zap_pmd_range mm/memory.c:1573 [inline] zap_pud_range mm/memory.c:1602 [inline] zap_p4d_range mm/memory.c:1623 [inline] unmap_page_range+0x18e0/0x2c10 mm/memory.c:1644 unmap_single_vma+0x194/0x2b0 mm/memory.c:1690 unmap_vmas+0x1e2/0x330 mm/memory.c:1731 exit_mmap+0x1ad/0xa60 mm/mmap.c:3210 __mmput+0x12a/0x4d0 kernel/fork.c:1349 mmput+0x62/0x70 kernel/fork.c:1371 exit_mm kernel/exit.c:567 [inline] do_exit+0x9ad/0x2a20 kernel/exit.c:861 do_group_exit+0xd4/0x2a0 kernel/exit.c:1024 get_signal+0x23ba/0x2790 kernel/signal.c:2892 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x60 kernel/entry/common.c:296 do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7efd4667cae9 Code: Unable to access opcode bytes at 0x7efd4667cabf. RSP: 002b:00007efd4748d0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 00007efd4679bf80 RCX: 00007efd4667cae9 RDX: 00000000200004c0 RSI: 0000000000005452 RDI: 0000000000000003 RBP: 00007efd466c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007efd4679bf80 R15: 00007ffe2834b2f8 Allocated by task 4493: 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 22: 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 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 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 task_work_add+0x88/0x2a0 kernel/task_work.c:48 scheduler_tick+0x228/0x650 kernel/sched/core.c:5662 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+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1074 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 The buggy address belongs to the object at ffff88801fb9bb80 which belongs to the cache task_struct of size 7360 The buggy address is located 176 bytes inside of freed 7360-byte region [ffff88801fb9bb80, ffff88801fb9d840) The buggy address belongs to the physical page: page:ffffea00007ee600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1fb98 head:ffffea00007ee600 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88802523c981 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888140005500 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff88802523c981 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 11, tgid 11 (kworker/u4:0), ts 16119447119, 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 user_mode_thread+0xb4/0xf0 kernel/fork.c:2987 call_usermodehelper_exec_work kernel/umh.c:172 [inline] call_usermodehelper_exec_work+0xcb/0x170 kernel/umh.c:158 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 page_owner free stack trace missing Memory state around the buggy address: ffff88801fb9bb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801fb9bb80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801fb9bc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801fb9bc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801fb9bd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 48 01 d0 add %rdx,%rax 3: 48 d1 f8 sar %rax 6: 4c 8d 3c 83 lea (%rbx,%rax,4),%r15 a: 4c 89 fa mov %r15,%rdx d: 48 c1 ea 03 shr $0x3,%rdx 11: 42 0f b6 0c 32 movzbl (%rdx,%r14,1),%ecx 16: 4c 89 fa mov %r15,%rdx 19: 83 e2 07 and $0x7,%edx 1c: 83 c2 03 add $0x3,%edx 1f: 38 ca cmp %cl,%dl 21: 7c 04 jl 0x27 23: 84 c9 test %cl,%cl 25: 75 6f jne 0x96 27: 49 63 17 movslq (%r15),%rdx * 2a: 4c 89 e7 mov %r12,%rdi <-- trapping instruction 2d: 4d 8d 2c 17 lea (%r15,%rdx,1),%r13 31: 4c 89 ee mov %r13,%rsi 34: e8 1c 89 4d 00 call 0x4d8955 39: 4d 39 ec cmp %r13,%r12 3c: 73 95 jae 0xffffffd3 3e: e8 .byte 0xe8 3f: 02 .byte 0x2