================================================================== 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 ffff88801fe41e70 by task syz-executor.1/6001 CPU: 0 PID: 6001 Comm: syz-executor.1 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+0x5c0/0x2390 arch/x86/kernel/unwind_orc.c:505 Code: 85 c0 49 89 c4 0f 84 99 fd ff ff e8 1a 7e 4d 00 4d 8d 6c 24 05 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 0f b6 04 02 <4c> 89 ea 83 e2 07 38 d0 7f 08 84 c0 0f 85 1d 19 00 00 45 0f b6 74 RSP: 0018:ffffc90000007700 EFLAGS: 00000a03 RAX: 0000000000000000 RBX: ffffc90000007780 RCX: 0000000000000100 RDX: 1ffffffff1fad1df RSI: ffffffff813a5bd6 RDI: 0000000000000006 RBP: 0000000000000002 R08: 0000000000000006 R09: ffffffff8829ab1e R10: ffffffff8829ab20 R11: 00000040561ffb2d R12: ffffffff8fd68ef8 R13: ffffffff8fd68efd R14: 000000000016bd22 R15: ffffc900000077b5 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 skb_kfree_head net/core/skbuff.c:943 [inline] skb_kfree_head net/core/skbuff.c:940 [inline] skb_free_head+0x17f/0x1b0 net/core/skbuff.c:957 skb_release_data+0x5ba/0x870 net/core/skbuff.c:987 skb_release_all net/core/skbuff.c:1053 [inline] __kfree_skb net/core/skbuff.c:1067 [inline] consume_skb net/core/skbuff.c:1283 [inline] consume_skb+0xd2/0x170 net/core/skbuff.c:1277 mac80211_hwsim_tx_frame+0x1f3/0x2a0 drivers/net/wireless/virtual/mac80211_hwsim.c:2172 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:__schedule+0xee9/0x5a10 kernel/sched/core.c:6577 Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 dc 43 00 00 48 8b bd 10 ff ff ff 49 89 5f 10 48 89 de e8 1f 84 c0 f6 48 89 c7 e8 f7 5d 1b f7 <48> 8b 9d 98 fe ff ff 48 b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 RSP: 0018:ffffc90015417470 EFLAGS: 00000206 RAX: 0000000000058393 RBX: ffff8880b983d1d0 RCX: 1ffffffff233b6a8 RDX: 0000000000000000 RSI: ffffffff8a8caca0 RDI: ffffffff8ae93420 RBP: ffffc90015417608 R08: 0000000000000001 R09: fffffbfff23389d6 R10: ffffffff919c4eb7 R11: 0000000000000001 R12: ffff888030240290 R13: 0000000000000000 R14: ffff888030240000 R15: ffff8880b983c700 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6864 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0x5d/0x70 kernel/locking/spinlock.c:194 __rcu_report_exp_rnp+0x29b/0x450 kernel/rcu/tree_exp.h:201 rcu_read_unlock_special kernel/rcu/tree_plugin.h:681 [inline] __rcu_read_unlock+0x2ad/0x570 kernel/rcu/tree_plugin.h:426 rcu_read_unlock+0x24/0xb0 include/linux/rcupdate.h:781 pte_unmap include/linux/pgtable.h:113 [inline] zap_pte_range mm/memory.c:1525 [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+0x147a/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: 0033:0x7f8d0f87cae9 Code: Unable to access opcode bytes at 0x7f8d0f87cabf. RSP: 002b:00007f8d106820c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: 0000000000000004 RBX: 00007f8d0f99bf80 RCX: 00007f8d0f87cae9 RDX: 0000000000000010 RSI: 0000000000000002 RDI: 0000000000000010 RBP: 00007f8d0f8c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f8d0f99bf80 R15: 00007ffd561c20f8 Allocated by task 2418: 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 user_mode_thread+0xb4/0xf0 kernel/fork.c:2987 call_usermodehelper_exec_sync kernel/umh.c:133 [inline] call_usermodehelper_exec_work+0x6b/0x170 kernel/umh.c:164 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 Freed by task 61: 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 do_nanosleep+0x218/0x500 kernel/time/hrtimer.c:2047 hrtimer_nanosleep+0x1ae/0x440 kernel/time/hrtimer.c:2100 common_nsleep+0xa1/0xc0 kernel/time/posix-timers.c:1350 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1396 [inline] __se_sys_clock_nanosleep kernel/time/posix-timers.c:1373 [inline] __x64_sys_clock_nanosleep+0x344/0x490 kernel/time/posix-timers.c:1373 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 ffff88801fe41dc0 which belongs to the cache task_struct of size 7360 The buggy address is located 176 bytes inside of freed 7360-byte region [ffff88801fe41dc0, ffff88801fe43a80) The buggy address belongs to the physical page: page:ffffea00007f9000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1fe40 head:ffffea00007f9000 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888059e6b881 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888014e43500 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff888059e6b881 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 59, tgid 59 (kworker/u4:4), ts 274466452623, free_ts 274393810611 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_sync kernel/umh.c:133 [inline] call_usermodehelper_exec_work+0x6b/0x170 kernel/umh.c:164 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 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 __unfreeze_partials+0x21d/0x240 mm/slub.c:2655 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] __kmem_cache_alloc_node+0x195/0x340 mm/slub.c:3517 kmalloc_node_trace+0x22/0xd0 mm/slab_common.c:1130 kmalloc_node include/linux/slab.h:615 [inline] kzalloc_node include/linux/slab.h:731 [inline] __get_vm_area_node+0xe1/0x3d0 mm/vmalloc.c:2588 __vmalloc_node_range+0x27a/0x1540 mm/vmalloc.c:3280 __vmalloc_node mm/vmalloc.c:3385 [inline] vzalloc+0x6b/0x80 mm/vmalloc.c:3458 alloc_counters net/ipv6/netfilter/ip6_tables.c:815 [inline] copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:837 [inline] get_entries net/ipv6/netfilter/ip6_tables.c:1039 [inline] do_ip6t_get_ctl+0x68d/0xab0 net/ipv6/netfilter/ip6_tables.c:1669 nf_getsockopt+0x76/0xe0 net/netfilter/nf_sockopt.c:116 ipv6_getsockopt+0x1f9/0x2b0 net/ipv6/ipv6_sockglue.c:1500 tcp_getsockopt+0x97/0xf0 net/ipv4/tcp.c:4280 __sys_getsockopt+0x220/0x6a0 net/socket.c:2371 Memory state around the buggy address: ffff88801fe41d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801fe41d80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb >ffff88801fe41e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801fe41e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801fe41f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 85 c0 test %eax,%eax 2: 49 89 c4 mov %rax,%r12 5: 0f 84 99 fd ff ff je 0xfffffda4 b: e8 1a 7e 4d 00 call 0x4d7e2a 10: 4d 8d 6c 24 05 lea 0x5(%r12),%r13 15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1c: fc ff df 1f: 4c 89 ea mov %r13,%rdx 22: 48 c1 ea 03 shr $0x3,%rdx 26: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax * 2a: 4c 89 ea mov %r13,%rdx <-- trapping instruction 2d: 83 e2 07 and $0x7,%edx 30: 38 d0 cmp %dl,%al 32: 7f 08 jg 0x3c 34: 84 c0 test %al,%al 36: 0f 85 1d 19 00 00 jne 0x1959 3c: 45 rex.RB 3d: 0f .byte 0xf 3e: b6 74 mov $0x74,%dh