================================================================== 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+0x3f8/0x828 kernel/sched/fair.c:3660 Read of size 8 at addr ffff0000c5dab830 by task syz-executor.0/6453 CPU: 0 PID: 6453 Comm: syz-executor.0 Not tainted 6.6.0-rc6-syzkaller-00068-g78124b0c1d10 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0x174/0x514 mm/kasan/report.c:475 kasan_report+0xd8/0x138 mm/kasan/report.c:588 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 __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+0x3f8/0x828 kernel/sched/fair.c:3660 update_cfs_group kernel/sched/fair.c:3826 [inline] entity_tick kernel/sched/fair.c:5317 [inline] task_tick_fair+0x1b8/0x4f4 kernel/sched/fair.c:12392 scheduler_tick+0x1f8/0x570 kernel/sched/core.c:5657 update_process_times+0x198/0x1f4 kernel/time/timer.c:2076 tick_sched_handle kernel/time/tick-sched.c:254 [inline] tick_sched_timer+0x330/0x4e8 kernel/time/tick-sched.c:1492 __run_hrtimer kernel/time/hrtimer.c:1688 [inline] __hrtimer_run_queues+0x458/0xca0 kernel/time/hrtimer.c:1752 hrtimer_interrupt+0x2c0/0xb64 kernel/time/hrtimer.c:1814 timer_handler drivers/clocksource/arm_arch_timer.c:674 [inline] arch_timer_handler_virt+0x74/0x88 drivers/clocksource/arm_arch_timer.c:685 handle_percpu_devid_irq+0x2a4/0x804 kernel/irq/chip.c:942 generic_handle_irq_desc include/linux/irqdesc.h:161 [inline] handle_irq_desc kernel/irq/irqdesc.c:672 [inline] generic_handle_domain_irq+0x7c/0xc4 kernel/irq/irqdesc.c:728 __gic_handle_irq drivers/irqchip/irq-gic-v3.c:783 [inline] __gic_handle_irq_from_irqson drivers/irqchip/irq-gic-v3.c:834 [inline] gic_handle_irq+0x6c/0x190 drivers/irqchip/irq-gic-v3.c:878 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:886 do_interrupt_handler+0xd4/0x138 arch/arm64/kernel/entry-common.c:276 __el1_irq arch/arm64/kernel/entry-common.c:502 [inline] el1_interrupt+0x34/0x68 arch/arm64/kernel/entry-common.c:517 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:522 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:591 dtSplitRoot+0x67c/0x1428 fs/jfs/jfs_dtree.c:1973 dtSplitUp fs/jfs/jfs_dtree.c:985 [inline] dtInsert+0xee8/0x54f4 fs/jfs/jfs_dtree.c:863 jfs_mkdir+0x6bc/0x9f8 fs/jfs/namei.c:270 vfs_mkdir+0x240/0x3a8 fs/namei.c:4120 do_mkdirat+0x20c/0x610 fs/namei.c:4143 __do_sys_mkdirat fs/namei.c:4158 [inline] __se_sys_mkdirat fs/namei.c:4156 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4156 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 Allocated by task 5622: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x7c mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:511 __kasan_slab_alloc+0x74/0x8c mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x90/0x4a0 mm/slab.h:762 slab_alloc_node mm/slub.c:3478 [inline] kmem_cache_alloc_node+0x2c8/0x46c mm/slub.c:3523 alloc_task_struct_node kernel/fork.c:173 [inline] dup_task_struct+0x74/0x888 kernel/fork.c:1110 copy_process+0x488/0x34b8 kernel/fork.c:2327 kernel_clone+0x1d8/0x80c kernel/fork.c:2909 __do_sys_clone kernel/fork.c:3052 [inline] __se_sys_clone kernel/fork.c:3020 [inline] __arm64_sys_clone+0x1f8/0x24c kernel/fork.c:3020 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 Freed by task 0: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x7c mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:522 ____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1800 [inline] slab_free_freelist_hook mm/slub.c:1826 [inline] slab_free mm/slub.c:3809 [inline] kmem_cache_free+0x2e4/0x56c mm/slub.c:3831 free_task_struct kernel/fork.c:178 [inline] free_task+0xe8/0x14c kernel/fork.c:627 __put_task_struct+0x178/0x210 kernel/fork.c:981 put_task_struct+0x88/0x10c include/linux/sched/task.h:136 delayed_put_task_struct+0xdc/0x2d8 kernel/exit.c:226 rcu_do_batch kernel/rcu/tree.c:2139 [inline] rcu_core+0x8a4/0x1b28 kernel/rcu/tree.c:2403 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2420 __do_softirq+0x2d0/0xd54 kernel/softirq.c:553 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:492 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:502 __call_rcu_common kernel/rcu/tree.c:2653 [inline] call_rcu+0x104/0xaf4 kernel/rcu/tree.c:2767 release_task+0x145c/0x1544 wait_task_zombie kernel/exit.c:1210 [inline] wait_consider_task+0x15d0/0x2660 kernel/exit.c:1437 do_wait_thread kernel/exit.c:1500 [inline] do_wait+0x2f4/0xac8 kernel/exit.c:1617 kernel_wait4+0x24c/0x3d8 kernel/exit.c:1780 __do_sys_wait4 kernel/exit.c:1808 [inline] __se_sys_wait4 kernel/exit.c:1804 [inline] __arm64_sys_wait4+0x11c/0x2a0 kernel/exit.c:1804 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 Second to last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:492 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:502 __call_rcu_common kernel/rcu/tree.c:2653 [inline] call_rcu+0x104/0xaf4 kernel/rcu/tree.c:2767 release_task+0x145c/0x1544 wait_task_zombie kernel/exit.c:1210 [inline] wait_consider_task+0x15d0/0x2660 kernel/exit.c:1437 do_wait_thread kernel/exit.c:1500 [inline] do_wait+0x2f4/0xac8 kernel/exit.c:1617 kernel_wait4+0x24c/0x3d8 kernel/exit.c:1780 __do_sys_wait4 kernel/exit.c:1808 [inline] __se_sys_wait4 kernel/exit.c:1804 [inline] __arm64_sys_wait4+0x11c/0x2a0 kernel/exit.c:1804 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 The buggy address belongs to the object at ffff0000c5dab780 which belongs to the cache task_struct of size 6848 The buggy address is located 176 bytes inside of freed 6848-byte region [ffff0000c5dab780, ffff0000c5dad240) The buggy address belongs to the physical page: page:00000000d589d0d6 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105da8 head:00000000d589d0d6 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 ksm flags: 0x5ffc00000000840(slab|head|node=0|zone=2|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 05ffc00000000840 ffff0000c185a500 fffffc0003281e00 dead000000000003 raw: 0000000000000000 0000000080040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000c5dab700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000c5dab780: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000c5dab800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000c5dab880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c5dab900: fb fb fb fb fb fb fb fb fb fb fb fb 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