================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline] BUG: KASAN: slab-use-after-free in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] BUG: KASAN: slab-use-after-free in mapping_inaccessible include/linux/pagemap.h:335 [inline] BUG: KASAN: slab-use-after-free in isolate_migratepages_block+0x3ea4/0x5680 mm/compaction.c:1180 Read of size 8 at addr ffff8880248fd9b0 by task kcompactd0/44 CPU: 2 UID: 0 PID: 44 Comm: kcompactd0 Not tainted 6.13.0-rc6-syzkaller-00231-g77a903cd8e5a #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xc3/0x620 mm/kasan/report.c:489 kasan_report+0xd9/0x110 mm/kasan/report.c:602 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] mapping_inaccessible include/linux/pagemap.h:335 [inline] isolate_migratepages_block+0x3ea4/0x5680 mm/compaction.c:1180 isolate_migratepages mm/compaction.c:2164 [inline] compact_zone+0x1a5c/0x4280 mm/compaction.c:2611 kcompactd_do_work+0x2e2/0xa50 mm/compaction.c:3087 kcompactd+0x8e2/0xdf0 mm/compaction.c:3186 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 5925: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4119 [inline] slab_alloc_node mm/slub.c:4168 [inline] kmem_cache_alloc_node_noprof+0x223/0x3c0 mm/slub.c:4220 alloc_task_struct_node kernel/fork.c:180 [inline] dup_task_struct kernel/fork.c:1108 [inline] copy_process+0x4be/0x8e50 kernel/fork.c:2224 kernel_clone+0xfd/0x960 kernel/fork.c:2806 __do_sys_clone3+0x1f9/0x270 kernel/fork.c:3110 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 0: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:582 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2353 [inline] slab_free mm/slub.c:4613 [inline] kmem_cache_free+0x152/0x4c0 mm/slub.c:4715 put_task_struct include/linux/sched/task.h:144 [inline] put_task_struct include/linux/sched/task.h:131 [inline] delayed_put_task_struct+0x119/0x2f0 kernel/exit.c:227 rcu_do_batch kernel/rcu/tree.c:2567 [inline] rcu_core+0x79d/0x14d0 kernel/rcu/tree.c:2823 handle_softirqs+0x213/0x8f0 kernel/softirq.c:561 __do_softirq kernel/softirq.c:595 [inline] invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:662 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 Last potentially related work creation: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:544 __call_rcu_common.constprop.0+0x99/0x7a0 kernel/rcu/tree.c:3086 put_task_struct_rcu_user kernel/exit.c:233 [inline] put_task_struct_rcu_user+0x75/0xc0 kernel/exit.c:230 release_task+0xe75/0x1b00 kernel/exit.c:282 wait_task_zombie kernel/exit.c:1249 [inline] wait_consider_task+0x1812/0x4100 kernel/exit.c:1476 do_wait_pid kernel/exit.c:1615 [inline] __do_wait+0x744/0x890 kernel/exit.c:1650 do_wait+0x217/0x570 kernel/exit.c:1691 kernel_wait4+0x16c/0x280 kernel/exit.c:1850 __do_sys_wait4+0x15f/0x170 kernel/exit.c:1878 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Second to last potentially related work creation: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:544 task_work_add+0x212/0x3b0 kernel/task_work.c:75 sched_tick+0x1f8/0x4f0 kernel/sched/core.c:5657 update_process_times+0x19c/0x2d0 kernel/time/timer.c:2524 tick_sched_handle kernel/time/tick-sched.c:276 [inline] tick_nohz_handler+0x376/0x530 kernel/time/tick-sched.c:297 __run_hrtimer kernel/time/hrtimer.c:1739 [inline] __hrtimer_run_queues+0x5fb/0xae0 kernel/time/hrtimer.c:1803 hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1865 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 The buggy address belongs to the object at ffff8880248fc880 which belongs to the cache task_struct of size 9024 The buggy address is located 4400 bytes inside of freed 9024-byte region [ffff8880248fc880, ffff8880248febc0) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x248f8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88805130aec1 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801c2da140 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000030003 00000001f5000000 ffff88805130aec1 head: 00fff00000000040 ffff88801c2da140 dead000000000122 0000000000000000 head: 0000000000000000 0000000000030003 00000001f5000000 ffff88805130aec1 head: 00fff00000000003 ffffea0000923e01 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 39, tgid 39 (kworker/u32:2), ts 117698553604, free_ts 117695882974 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1558 prep_new_page mm/page_alloc.c:1566 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3476 __alloc_pages_noprof+0x223/0x25b0 mm/page_alloc.c:4753 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2269 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab mm/slub.c:2589 [inline] new_slab+0x2c9/0x410 mm/slub.c:2642 ___slab_alloc+0xd7d/0x17a0 mm/slub.c:3830 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3920 __slab_alloc_node mm/slub.c:3995 [inline] slab_alloc_node mm/slub.c:4156 [inline] kmem_cache_alloc_node_noprof+0xfc/0x3c0 mm/slub.c:4220 alloc_task_struct_node kernel/fork.c:180 [inline] dup_task_struct kernel/fork.c:1108 [inline] copy_process+0x4be/0x8e50 kernel/fork.c:2224 kernel_clone+0xfd/0x960 kernel/fork.c:2806 user_mode_thread+0xb4/0xf0 kernel/fork.c:2884 call_usermodehelper_exec_sync kernel/umh.c:132 [inline] call_usermodehelper_exec_work+0x6b/0x170 kernel/umh.c:163 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3317 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 page last free pid 5923 tgid 5923 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0x661/0x1080 mm/page_alloc.c:2659 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4119 [inline] slab_alloc_node mm/slub.c:4168 [inline] kmem_cache_alloc_node_noprof+0x223/0x3c0 mm/slub.c:4220 __alloc_skb+0x2b1/0x380 net/core/skbuff.c:668 alloc_skb_fclone include/linux/skbuff.h:1373 [inline] tcp_stream_alloc_skb+0x34/0x570 net/ipv4/tcp.c:886 tcp_sendmsg_locked+0xed5/0x3770 net/ipv4/tcp.c:1168 tcp_sendmsg+0x2e/0x50 net/ipv4/tcp.c:1358 inet_sendmsg+0xb9/0x140 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:711 [inline] __sock_sendmsg net/socket.c:726 [inline] sock_write_iter+0x4ac/0x5b0 net/socket.c:1147 new_sync_write fs/read_write.c:586 [inline] vfs_write+0x5ae/0x1150 fs/read_write.c:679 ksys_write+0x207/0x250 fs/read_write.c:731 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff8880248fd880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880248fd900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880248fd980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880248fda00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880248fda80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================