================================================================== 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 ffff8880305fd9f0 by task syz-executor.5/6706 CPU: 1 PID: 6706 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:unwind_next_frame+0x1a72/0x2390 arch/x86/kernel/unwind_orc.c:648 Code: c1 ee 03 0f b6 14 16 48 89 fe 83 e6 07 40 38 f1 40 0f 9e c6 84 c9 0f 95 c1 40 84 ce 0f 85 88 08 00 00 83 e0 07 38 c2 0f 9e c1 <84> d2 0f 95 c0 84 c1 0f 85 73 08 00 00 4d 0f bf 64 24 02 ba 08 00 RSP: 0018:ffffc900001f0638 EFLAGS: 00000293 RAX: 0000000000000003 RBX: ffffc900001f06b8 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff8f60893a RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000004 R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8f608938 R13: ffffc900151179f8 R14: 0000000000000001 R15: 0000000000000001 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 kmalloc_reserve+0x166/0x260 net/core/skbuff.c:559 __alloc_skb+0x12b/0x330 net/core/skbuff.c:650 __netdev_alloc_skb+0x72/0x3f0 net/core/skbuff.c:714 netdev_alloc_skb include/linux/skbuff.h:3225 [inline] dev_alloc_skb include/linux/skbuff.h:3238 [inline] __ieee80211_beacon_get+0xc28/0x16d0 net/mac80211/tx.c:5426 ieee80211_beacon_get_tim+0xa5/0x560 net/mac80211/tx.c:5548 ieee80211_beacon_get include/net/mac80211.h:5421 [inline] mac80211_hwsim_beacon_tx+0x3f6/0x730 drivers/net/wireless/virtual/mac80211_hwsim.c:2260 __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:preempt_schedule_irq+0x4d/0x90 kernel/sched/core.c:7007 Code: 55 65 48 8b 2c 25 c0 bc 03 00 53 48 89 eb 48 c1 eb 03 48 01 c3 bf 01 00 00 00 e8 7e 92 1a f7 e8 69 6e 4e f7 fb bf 01 00 00 00 2e 99 ff ff 9c 58 fa f6 c4 02 75 1a bf 01 00 00 00 e8 bc 58 1a RSP: 0018:ffffc90015117438 EFLAGS: 00000206 RAX: 000000000017ddb1 RBX: ffffed100fa0c3b8 RCX: 1ffffffff233b6c2 RDX: 0000000000000000 RSI: ffffffff8a8caca0 RDI: 0000000000000001 RBP: ffff88807d061dc0 R08: 0000000000000001 R09: fffffbfff23389d6 R10: ffffffff919c4eb7 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 irqentry_exit+0x35/0x80 kernel/entry/common.c:432 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:__sanitizer_cov_trace_pc+0x11/0x70 kernel/kcov.c:207 Code: b0 01 00 00 e8 b0 ff ff ff 31 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 65 8b 05 cd e2 7b 7e 89 c1 48 8b 34 24 <81> e1 00 01 00 00 65 48 8b 14 25 c0 bc 03 00 a9 00 01 ff 00 74 0e RSP: 0018:ffffc90015117508 EFLAGS: 00000202 RAX: 0000000080000000 RBX: ffffc90015117590 RCX: 0000000080000000 RDX: ffff88807d061dc0 RSI: ffffffff813a5697 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 1ffff11003abdbb2 R12: ffffc90015117590 R13: ffffffff81758040 R14: ffffc90015117650 R15: ffff88807d061dc0 unwind_next_frame+0x67/0x2390 arch/x86/kernel/unwind_orc.c:470 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_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 remove_vma+0x128/0x170 mm/mmap.c:146 exit_mmap+0x453/0xa60 mm/mmap.c:3234 __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: 0033:0x7f47da67cae9 Code: Unable to access opcode bytes at 0x7f47da67cabf. RSP: 002b:00007f47db3000c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: 0000000000000010 RBX: 00007f47da79c050 RCX: 00007f47da67cae9 RDX: 0000000000000010 RSI: 00000000200005c0 RDI: 0000000000000007 RBP: 00007f47da6c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f47da79c050 R15: 00007fff826d7858 Allocated by task 4491: 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 16: 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 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6864 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45 unwind_next_frame+0x1c80/0x2390 arch/x86/kernel/unwind_orc.c:672 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_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:198 [inline] __do_kmalloc_node mm/slab_common.c:1026 [inline] __kmalloc+0x60/0x100 mm/slab_common.c:1039 kmalloc include/linux/slab.h:603 [inline] kzalloc include/linux/slab.h:720 [inline] ieee802_11_parse_elems_full+0xc7/0x1380 net/mac80211/util.c:1602 ieee802_11_parse_elems_crc net/mac80211/ieee80211_i.h:2327 [inline] ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2334 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1609 [inline] ieee80211_ibss_rx_queued_mgmt+0xc65/0x2ed0 net/mac80211/ibss.c:1642 ieee80211_iface_process_skb net/mac80211/iface.c:1604 [inline] ieee80211_iface_work+0xa1f/0xd40 net/mac80211/iface.c:1658 cfg80211_wiphy_work+0x24e/0x330 net/wireless/core.c:435 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 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 ffff8880305fd940 which belongs to the cache task_struct of size 7360 The buggy address is located 176 bytes inside of freed 7360-byte region [ffff8880305fd940, ffff8880305ff600) The buggy address belongs to the physical page: page:ffffea0000c17e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x305f8 head:ffffea0000c17e00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888027d5f101 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888014e43500 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff888027d5f101 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5087, tgid 5087 (syz-executor.4), ts 198041650519, free_ts 198021869997 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 __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 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1136 [inline] free_unref_page_prepare+0x476/0xa40 mm/page_alloc.c:2312 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2405 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x18e/0x1d0 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x65/0x90 mm/kasan/common.c:305 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 vm_area_dup+0x21/0x2f0 kernel/fork.c:500 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 Memory state around the buggy address: ffff8880305fd880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880305fd900: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb >ffff8880305fd980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880305fda00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880305fda80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: c1 ee 03 shr $0x3,%esi 3: 0f b6 14 16 movzbl (%rsi,%rdx,1),%edx 7: 48 89 fe mov %rdi,%rsi a: 83 e6 07 and $0x7,%esi d: 40 38 f1 cmp %sil,%cl 10: 40 0f 9e c6 setle %sil 14: 84 c9 test %cl,%cl 16: 0f 95 c1 setne %cl 19: 40 84 ce test %cl,%sil 1c: 0f 85 88 08 00 00 jne 0x8aa 22: 83 e0 07 and $0x7,%eax 25: 38 c2 cmp %al,%dl 27: 0f 9e c1 setle %cl * 2a: 84 d2 test %dl,%dl <-- trapping instruction 2c: 0f 95 c0 setne %al 2f: 84 c1 test %al,%cl 31: 0f 85 73 08 00 00 jne 0x8aa 37: 4d 0f bf 64 24 02 movswq 0x2(%r12),%r12 3d: ba .byte 0xba 3e: 08 00 or %al,(%rax)