NOHZ tick-stop error: local softirq work is pending, handler #208!!! NOHZ tick-stop error: local softirq work is pending, handler #40!!! ================================================================== BUG: KASAN: slab-use-after-free in rb_next+0x93/0xf0 lib/rbtree.c:505 Read of size 8 at addr ffff88801dbbdcd0 by task swapper/0/0 CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.11.0-rc4-next-20240820-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 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_next+0x93/0xf0 lib/rbtree.c:505 sched_core_next kernel/sched/core.c:311 [inline] try_steal_cookie kernel/sched/core.c:6316 [inline] steal_cookie_task kernel/sched/core.c:6333 [inline] sched_core_balance+0xacd/0x1180 kernel/sched/core.c:6353 do_balance_callbacks kernel/sched/core.c:4963 [inline] __balance_callbacks+0x188/0x280 kernel/sched/core.c:5017 finish_lock_switch kernel/sched/core.c:5064 [inline] finish_task_switch+0x1d3/0x870 kernel/sched/core.c:5183 context_switch kernel/sched/core.c:5314 [inline] __schedule+0x1852/0x4b30 kernel/sched/core.c:6677 schedule_idle+0x53/0x90 kernel/sched/core.c:6795 do_idle+0x56a/0x5d0 kernel/sched/idle.c:354 cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:424 rest_init+0x2dc/0x300 init/main.c:747 start_kernel+0x47a/0x500 init/main.c:1103 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0x9f/0xa0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x147 Allocated by task 5345: 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:2206 kernel_clone+0x226/0x8f0 kernel/fork.c:2787 __do_sys_clone3 kernel/fork.c:3091 [inline] __se_sys_clone3+0x2cb/0x350 kernel/fork.c:3070 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 5282: 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+0x195/0x3d0 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 schedule_idle+0x53/0x90 kernel/sched/core.c:6795 do_idle+0x56a/0x5d0 kernel/sched/idle.c:354 cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:424 rest_init+0x2dc/0x300 init/main.c:747 start_kernel+0x47a/0x500 init/main.c:1103 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0x9f/0xa0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x147 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 ffff88801dbbda00 which belongs to the cache task_struct of size 7424 The buggy address is located 720 bytes inside of freed 7424-byte region [ffff88801dbbda00, ffff88801dbbf700) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1dbb8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888026124fc1 ksm flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000040 ffff8880166fb500 ffffea00009ae600 0000000000000003 raw: 0000000000000000 0000000000040004 00000001fdffffff ffff888026124fc1 head: 00fff00000000040 ffff8880166fb500 ffffea00009ae600 0000000000000003 head: 0000000000000000 0000000000040004 00000001fdffffff ffff888026124fc1 head: 00fff00000000003 ffffea000076ee01 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 5139, tgid 5139 (dhcpcd-run-hook), ts 52824510832, free_ts 52740603649 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+0x3004/0x30c0 mm/page_alloc.c:3476 __alloc_pages_noprof+0x29e/0x780 mm/page_alloc.c:4743 __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:2206 kernel_clone+0x226/0x8f0 kernel/fork.c:2787 __do_sys_clone kernel/fork.c:2930 [inline] __se_sys_clone kernel/fork.c:2914 [inline] __x64_sys_clone+0x258/0x2a0 kernel/fork.c:2914 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 5133 tgid 5133 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+0x9e/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] __do_kmalloc_node mm/slub.c:4205 [inline] __kmalloc_noprof+0x1a6/0x400 mm/slub.c:4218 kmalloc_noprof include/linux/slab.h:685 [inline] tomoyo_realpath_from_path+0xcf/0x5e0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x2b7/0x740 security/tomoyo/file.c:822 security_inode_getattr+0xd8/0x130 security/security.c:2282 vfs_getattr+0x45/0x430 fs/stat.c:242 vfs_fstat fs/stat.c:267 [inline] vfs_fstatat+0xe4/0x190 fs/stat.c:376 __do_sys_newfstatat fs/stat.c:543 [inline] __se_sys_newfstatat fs/stat.c:537 [inline] __x64_sys_newfstatat+0x11d/0x1a0 fs/stat.c:537 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: ffff88801dbbdb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801dbbdc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801dbbdc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801dbbdd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801dbbdd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================