================================================================== BUG: KASAN: slab-use-after-free in debug_spin_unlock kernel/locking/spinlock_debug.c:100 [inline] BUG: KASAN: slab-use-after-free in do_raw_spin_unlock+0x48c/0x8b0 kernel/locking/spinlock_debug.c:141 Read of size 4 at addr ffff888178c48184 by task syz.2.25/4414 CPU: 1 UID: 0 PID: 4414 Comm: syz.2.25 Not tainted 6.13.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x108/0x280 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 debug_spin_unlock kernel/locking/spinlock_debug.c:100 [inline] do_raw_spin_unlock+0x48c/0x8b0 kernel/locking/spinlock_debug.c:141 __raw_spin_unlock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_unlock+0x1e/0x50 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:391 [inline] move_pages_pte+0x5a5/0x23e0 mm/userfaultfd.c:1212 move_pages+0x980/0x1010 mm/userfaultfd.c:1754 userfaultfd_move fs/userfaultfd.c:1899 [inline] userfaultfd_ioctl+0x744/0x4e50 fs/userfaultfd.c:2022 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xab/0x100 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x8d/0x190 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2926f7ff19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2927d92058 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f2927145fa0 RCX: 00007f2926f7ff19 RDX: 0000000020000080 RSI: 00000000c028aa05 RDI: 0000000000000003 RBP: 00007f2926ff3986 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f2927145fa0 R15: 00007ffd9947b448 Allocated by task 4413: 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:4104 [inline] slab_alloc_node mm/slub.c:4153 [inline] kmem_cache_alloc_noprof+0x1b9/0x410 mm/slub.c:4160 ptlock_alloc+0x1b/0x60 mm/memory.c:7022 ptlock_init include/linux/mm.h:2971 [inline] pagetable_pte_ctor include/linux/mm.h:2998 [inline] __pte_alloc_one_noprof include/asm-generic/pgalloc.h:73 [inline] pte_alloc_one+0xc1/0x3b0 arch/x86/mm/pgtable.c:41 __do_huge_pmd_anonymous_page mm/huge_memory.c:1223 [inline] do_huge_pmd_anonymous_page+0x240/0x8d0 mm/huge_memory.c:1368 create_huge_pmd mm/memory.c:5735 [inline] __handle_mm_fault mm/memory.c:5984 [inline] handle_mm_fault+0xf9b/0x1920 mm/memory.c:6181 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x432/0x7b0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 Freed by task 4415: 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:576 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:2338 [inline] slab_free mm/slub.c:4598 [inline] kmem_cache_free+0x17e/0x470 mm/slub.c:4700 pagetable_pte_dtor include/linux/mm.h:3009 [inline] ___pte_free_tlb+0x87/0x330 arch/x86/mm/pgtable.c:63 __pte_free_tlb arch/x86/include/asm/pgalloc.h:61 [inline] free_pte+0x11c/0x170 mm/pt_reclaim.c:31 zap_pte_range mm/memory.c:1780 [inline] zap_pmd_range mm/memory.c:1822 [inline] zap_pud_range mm/memory.c:1851 [inline] zap_p4d_range mm/memory.c:1872 [inline] unmap_page_range+0x3dee/0x43c0 mm/memory.c:1893 zap_page_range_single+0x3d2/0x550 mm/memory.c:2018 madvise_dontneed_single_vma mm/madvise.c:859 [inline] madvise_dontneed_free mm/madvise.c:940 [inline] madvise_vma_behavior mm/madvise.c:1270 [inline] madvise_walk_vmas mm/madvise.c:1502 [inline] do_madvise+0x24be/0x3ee0 mm/madvise.c:1689 __do_sys_madvise mm/madvise.c:1705 [inline] __se_sys_madvise mm/madvise.c:1703 [inline] __x64_sys_madvise+0xa1/0xb0 mm/madvise.c:1703 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x8d/0x190 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888178c48180 which belongs to the cache page->ptl of size 64 The buggy address is located 4 bytes inside of freed 64-byte region [ffff888178c48180, ffff888178c481c0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x178c48 anon flags: 0x100000000000000(node=0|zone=2) page_type: f5(slab) raw: 0100000000000000 ffff88810004f780 ffffea0004757380 dead000000000005 raw: 0000000000000000 00000000802a002a 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 3126, tgid 3126 (udevd), ts 14068640973, free_ts 14060442946 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x108/0x120 mm/page_alloc.c:1549 prep_new_page mm/page_alloc.c:1557 [inline] get_page_from_freelist+0x3229/0x3370 mm/page_alloc.c:3475 __alloc_frozen_pages_noprof+0x256/0x650 mm/page_alloc.c:4752 alloc_pages_mpol+0x21c/0x460 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:2408 [inline] allocate_slab+0x8b/0x350 mm/slub.c:2574 new_slab mm/slub.c:2627 [inline] ___slab_alloc+0x9ff/0x1130 mm/slub.c:3815 __slab_alloc mm/slub.c:3905 [inline] __slab_alloc_node mm/slub.c:3980 [inline] slab_alloc_node mm/slub.c:4141 [inline] kmem_cache_alloc_noprof+0x279/0x410 mm/slub.c:4160 ptlock_alloc+0x1b/0x60 mm/memory.c:7022 ptlock_init include/linux/mm.h:2971 [inline] pagetable_pte_ctor include/linux/mm.h:2998 [inline] __pte_alloc_one_noprof include/asm-generic/pgalloc.h:73 [inline] pte_alloc_one+0xc1/0x3b0 arch/x86/mm/pgtable.c:41 __pte_alloc+0x71/0x200 mm/memory.c:446 copy_pte_range mm/memory.c:1106 [inline] copy_pmd_range mm/memory.c:1261 [inline] copy_pud_range+0x5299/0x5880 mm/memory.c:1298 copy_p4d_range mm/memory.c:1322 [inline] copy_page_range+0x52e/0x7c0 mm/memory.c:1420 dup_mmap kernel/fork.c:751 [inline] dup_mm kernel/fork.c:1695 [inline] copy_mm+0xf6a/0x1a70 kernel/fork.c:1744 copy_process+0x1194/0x3350 kernel/fork.c:2395 kernel_clone+0x195/0x720 kernel/fork.c:2807 __do_sys_clone kernel/fork.c:2950 [inline] __se_sys_clone kernel/fork.c:2934 [inline] __x64_sys_clone+0x253/0x2a0 kernel/fork.c:2934 page last free pid 16 tgid 16 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0xc15/0xe90 mm/page_alloc.c:2658 __folio_put+0x234/0x2c0 mm/swap.c:112 __tlb_remove_table arch/x86/include/asm/tlb.h:34 [inline] __tlb_remove_table_free mm/mmu_gather.c:227 [inline] tlb_remove_table_rcu+0x5e/0xc0 mm/mmu_gather.c:282 rcu_do_batch kernel/rcu/tree.c:2567 [inline] rcu_core+0xcb3/0x1630 kernel/rcu/tree.c:2823 handle_softirqs+0x1ba/0x580 kernel/softirq.c:554 run_ksoftirqd+0x28/0x40 kernel/softirq.c:943 smpboot_thread_fn+0x578/0x7f0 kernel/smpboot.c:164 kthread+0x268/0x2c0 kernel/kthread.c:389 ret_from_fork+0x32/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff888178c48080: 00 00 00 00 fc fc fc fc fa fb fb fb fb fb fb fb ffff888178c48100: fc fc fc fc fa fb fb fb fb fb fb fb fc fc fc fc >ffff888178c48180: fa fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb ^ ffff888178c48200: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb ffff888178c48280: fc fc fc fc 00 00 00 00 00 00 00 00 fc fc fc fc ==================================================================