================================================================== BUG: KASAN: slab-use-after-free in rb_sched_core_cmp kernel/sched/core.c:259 [inline] BUG: KASAN: slab-use-after-free in rb_find_first include/linux/rbtree.h:291 [inline] BUG: KASAN: slab-use-after-free in sched_core_find kernel/sched/core.c:333 [inline] BUG: KASAN: slab-use-after-free in pick_next_task kernel/sched/core.c:6178 [inline] BUG: KASAN: slab-use-after-free in __schedule+0x374a/0x4b30 kernel/sched/core.c:6632 Read of size 8 at addr ffff8880227020d8 by task kworker/0:1/9 CPU: 0 UID: 0 PID: 9 Comm: kworker/0:1 Not tainted 6.11.0-rc4-next-20240823-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Workqueue: events nsim_fib_event_work Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 rb_sched_core_cmp kernel/sched/core.c:259 [inline] rb_find_first include/linux/rbtree.h:291 [inline] sched_core_find kernel/sched/core.c:333 [inline] pick_next_task kernel/sched/core.c:6178 [inline] __schedule+0x374a/0x4b30 kernel/sched/core.c:6632 __schedule_loop kernel/sched/core.c:6754 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6769 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2583 schedule_timeout_uninterruptible kernel/time/timer.c:2617 [inline] msleep+0xa2/0xe0 kernel/time/timer.c:2738 nsim_fib6_rt_add drivers/net/netdevsim/fib.c:693 [inline] nsim_fib6_rt_insert drivers/net/netdevsim/fib.c:759 [inline] nsim_fib6_event drivers/net/netdevsim/fib.c:856 [inline] nsim_fib_event drivers/net/netdevsim/fib.c:889 [inline] nsim_fib_event_work+0x2e2f/0x4130 drivers/net/netdevsim/fib.c:1492 process_one_work kernel/workqueue.c:3232 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3313 worker_thread+0x86d/0xd10 kernel/workqueue.c:3390 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 5360: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4036 [inline] slab_alloc_node mm/slub.c:4085 [inline] kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4128 alloc_task_struct_node kernel/fork.c:180 [inline] dup_task_struct+0x57/0x8c0 kernel/fork.c:1107 copy_process+0x5d1/0x3d50 kernel/fork.c:2203 kernel_clone+0x226/0x8f0 kernel/fork.c:2784 __do_sys_clone3 kernel/fork.c:3088 [inline] __se_sys_clone3+0x2cb/0x350 kernel/fork.c:3067 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5385: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2299 [inline] slab_free mm/slub.c:4521 [inline] kmem_cache_free+0x194/0x3d0 mm/slub.c:4623 put_task_struct include/linux/sched/task.h:139 [inline] delayed_put_task_struct+0x125/0x300 kernel/exit.c:228 rcu_do_batch kernel/rcu/tree.c:2567 [inline] rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2823 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1037 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541 __call_rcu_common kernel/rcu/tree.c:3086 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:3190 context_switch kernel/sched/core.c:5314 [inline] __schedule+0x1852/0x4b30 kernel/sched/core.c:6677 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6999 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707 Second to last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541 task_work_add+0xb8/0x450 kernel/task_work.c:66 task_tick_mm_cid kernel/sched/core.c:10422 [inline] sched_tick+0x322/0x610 kernel/sched/core.c:5594 update_process_times+0x202/0x230 kernel/time/timer.c:2492 tick_sched_handle kernel/time/tick-sched.c:276 [inline] tick_nohz_handler+0x37c/0x500 kernel/time/tick-sched.c:297 __run_hrtimer kernel/time/hrtimer.c:1691 [inline] __hrtimer_run_queues+0x551/0xd50 kernel/time/hrtimer.c:1755 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1817 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1026 [inline] __sysvec_apic_timer_interrupt+0x110/0x3f0 arch/x86/kernel/apic/apic.c:1043 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1037 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 The buggy address belongs to the object at ffff888022701e00 which belongs to the cache task_struct of size 7424 The buggy address is located 728 bytes inside of freed 7424-byte region [ffff888022701e00, ffff888022703b00) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22700 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888029f78f81 anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff8880166fb500 0000000000000000 0000000000000001 raw: 0000000000000000 0000000000040004 00000001f5000000 ffff888029f78f81 head: 00fff00000000040 ffff8880166fb500 0000000000000000 0000000000000001 head: 0000000000000000 0000000000040004 00000001f5000000 ffff888029f78f81 head: 00fff00000000003 ffffea000089c001 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 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 5207, tgid 5207 (sshd), ts 54248667345, free_ts 54216867034 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1517 prep_new_page mm/page_alloc.c:1525 [inline] get_page_from_freelist+0x312a/0x3270 mm/page_alloc.c:3476 __alloc_pages_noprof+0x29e/0x780 mm/page_alloc.c:4748 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2368 allocate_slab+0x5a/0x2f0 mm/slub.c:2531 new_slab mm/slub.c:2584 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3771 __slab_alloc+0x58/0xa0 mm/slub.c:3861 __slab_alloc_node mm/slub.c:3914 [inline] slab_alloc_node mm/slub.c:4073 [inline] kmem_cache_alloc_node_noprof+0x1fe/0x320 mm/slub.c:4128 alloc_task_struct_node kernel/fork.c:180 [inline] dup_task_struct+0x57/0x8c0 kernel/fork.c:1107 copy_process+0x5d1/0x3d50 kernel/fork.c:2203 kernel_clone+0x226/0x8f0 kernel/fork.c:2784 __do_sys_clone kernel/fork.c:2927 [inline] __se_sys_clone kernel/fork.c:2911 [inline] __x64_sys_clone+0x258/0x2a0 kernel/fork.c:2911 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 5207 tgid 5207 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1098 [inline] free_unref_page+0xc07/0xd90 mm/page_alloc.c:2651 discard_slab mm/slub.c:2630 [inline] __put_partials+0xeb/0x130 mm/slub.c:3098 put_cpu_partial+0x17c/0x250 mm/slub.c:3173 __slab_free+0x2ea/0x3d0 mm/slub.c:4391 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4036 [inline] slab_alloc_node mm/slub.c:4085 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4092 vm_area_alloc+0x24/0x1d0 kernel/fork.c:472 mmap_region+0xaa3/0x20a0 mm/mmap.c:1455 do_mmap+0x8f9/0x1010 mm/mmap.c:495 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:588 ksys_mmap_pgoff+0x4f1/0x720 mm/mmap.c:541 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888022701f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888022702000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888022702080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888022702100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888022702180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================