================================================================== BUG: KASAN: slab-use-after-free in __lock_acquire+0x78/0x2100 kernel/locking/lockdep.c:5089 Read of size 8 at addr ffff888034810798 by task syz.4.22/5997 CPU: 0 UID: 0 PID: 5997 Comm: syz.4.22 Not tainted 6.13.0-rc1-next-20241205-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+0x241/0x360 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 __lock_acquire+0x78/0x2100 kernel/locking/lockdep.c:5089 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] __pte_offset_map_lock+0x1ba/0x300 mm/pgtable-generic.c:402 pte_offset_map_lock include/linux/mm.h:3027 [inline] follow_page_pte+0x121/0x1460 mm/gup.c:859 follow_pmd_mask mm/gup.c:982 [inline] follow_pud_mask mm/gup.c:1034 [inline] follow_p4d_mask mm/gup.c:1051 [inline] follow_page_mask mm/gup.c:1094 [inline] __get_user_pages+0xb23/0x4370 mm/gup.c:1493 populate_vma_page_range+0x264/0x330 mm/gup.c:1933 __mm_populate+0x27a/0x460 mm/gup.c:2036 mm_populate include/linux/mm.h:3389 [inline] vm_mmap_pgoff+0x303/0x430 mm/util.c:585 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 RIP: 0033:0x7fb5ce57fed9 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:00007fb5cf311058 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007fb5ce746080 RCX: 00007fb5ce57fed9 RDX: 0000000000000002 RSI: 0000000000400000 RDI: 00000000202ee000 RBP: 00007fb5ce5f3cc8 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000004008031 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fb5ce746080 R15: 00007ffdb71b37a8 Allocated by task 5997: 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+0x1d9/0x380 mm/slub.c:4160 ptlock_alloc+0x20/0x70 mm/memory.c:7026 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+0xd3/0x510 arch/x86/mm/pgtable.c:41 do_fault_around mm/memory.c:5345 [inline] do_read_fault mm/memory.c:5384 [inline] do_fault mm/memory.c:5527 [inline] do_pte_missing mm/memory.c:4048 [inline] handle_pte_fault+0x2913/0x5ee0 mm/memory.c:5872 __handle_mm_fault mm/memory.c:6015 [inline] handle_mm_fault+0x1106/0x1bb0 mm/memory.c:6183 faultin_page mm/gup.c:1200 [inline] __get_user_pages+0x1b31/0x4370 mm/gup.c:1495 populate_vma_page_range+0x264/0x330 mm/gup.c:1933 __mm_populate+0x27a/0x460 mm/gup.c:2036 mm_populate include/linux/mm.h:3389 [inline] vm_mmap_pgoff+0x303/0x430 mm/util.c:585 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 5994: 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+0x195/0x410 mm/slub.c:4700 pagetable_pte_dtor include/linux/mm.h:3009 [inline] ___pte_free_tlb+0x2b/0x140 arch/x86/mm/pgtable.c:63 __pte_free_tlb arch/x86/include/asm/pgalloc.h:61 [inline] free_pte+0x142/0x190 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+0x4062/0x48d0 mm/memory.c:1893 zap_page_range_single+0x45c/0x630 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+0x2774/0x4d90 mm/madvise.c:1689 __do_sys_madvise mm/madvise.c:1705 [inline] __se_sys_madvise mm/madvise.c:1703 [inline] __x64_sys_madvise+0xa6/0xc0 mm/madvise.c:1703 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 The buggy address belongs to the object at ffff888034810780 which belongs to the cache page->ptl of size 64 The buggy address is located 24 bytes inside of freed 64-byte region [ffff888034810780, ffff8880348107c0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x34810 ksm flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801ac4f780 ffffea0000c30e40 0000000000000003 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 5207, tgid 5207 (udevd), ts 63478789549, free_ts 61554071544 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1549 prep_new_page mm/page_alloc.c:1557 [inline] get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3475 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4752 alloc_pages_mpol+0x30e/0x550 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:2408 [inline] allocate_slab+0x8f/0x3a0 mm/slub.c:2574 new_slab mm/slub.c:2627 [inline] ___slab_alloc+0xc27/0x14a0 mm/slub.c:3815 __slab_alloc+0x58/0xa0 mm/slub.c:3905 __slab_alloc_node mm/slub.c:3980 [inline] slab_alloc_node mm/slub.c:4141 [inline] kmem_cache_alloc_noprof+0x268/0x380 mm/slub.c:4160 ptlock_alloc mm/memory.c:7026 [inline] ptlock_init include/linux/mm.h:2971 [inline] pmd_ptlock_init include/linux/mm.h:3078 [inline] pagetable_pmd_ctor include/linux/mm.h:3116 [inline] pmd_alloc_one_noprof include/asm-generic/pgalloc.h:141 [inline] __pmd_alloc+0x10b/0x670 mm/memory.c:6436 pmd_alloc include/linux/mm.h:2862 [inline] copy_pmd_range+0x7352/0x77a0 mm/memory.c:1241 copy_pud_range mm/memory.c:1298 [inline] copy_p4d_range mm/memory.c:1322 [inline] copy_page_range+0x99f/0xe90 mm/memory.c:1420 dup_mmap kernel/fork.c:751 [inline] dup_mm kernel/fork.c:1693 [inline] copy_mm+0x12d2/0x2060 kernel/fork.c:1742 copy_process+0x1845/0x3d80 kernel/fork.c:2393 kernel_clone+0x226/0x8e0 kernel/fork.c:2805 __do_sys_clone kernel/fork.c:2948 [inline] __se_sys_clone kernel/fork.c:2932 [inline] __x64_sys_clone+0x258/0x2a0 kernel/fork.c:2932 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 page last free pid 5819 tgid 5819 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0xe0d/0x10e0 mm/page_alloc.c:2658 __folio_put+0x2b3/0x360 mm/swap.c:112 skb_page_unref include/linux/skbuff_ref.h:43 [inline] __skb_frag_unref include/linux/skbuff_ref.h:56 [inline] skb_release_data+0x483/0x8a0 net/core/skbuff.c:1119 skb_release_all net/core/skbuff.c:1190 [inline] __kfree_skb+0x55/0x70 net/core/skbuff.c:1204 tcp_clean_rtx_queue net/ipv4/tcp_input.c:3436 [inline] tcp_ack+0x2442/0x6bc0 net/ipv4/tcp_input.c:4032 tcp_rcv_established+0xfaf/0x1f20 net/ipv4/tcp_input.c:6173 tcp_v4_do_rcv+0x96d/0xc70 net/ipv4/tcp_ipv4.c:1916 sk_backlog_rcv include/net/sock.h:1121 [inline] __release_sock+0x214/0x350 net/core/sock.c:3083 release_sock+0x61/0x1f0 net/core/sock.c:3637 tcp_sendmsg+0x3a/0x50 net/ipv4/tcp.c:1359 sock_sendmsg_nosec net/socket.c:711 [inline] __sock_sendmsg+0x1a6/0x270 net/socket.c:726 sock_write_iter+0x2d7/0x3f0 net/socket.c:1147 new_sync_write fs/read_write.c:586 [inline] vfs_write+0xaeb/0xd30 fs/read_write.c:679 ksys_write+0x18f/0x2b0 fs/read_write.c:731 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: ffff888034810680: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb ffff888034810700: fc fc fc fc 00 00 00 00 00 00 00 00 fc fc fc fc >ffff888034810780: fa fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb ^ ffff888034810800: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb ffff888034810880: fc fc fc fc fa fb fb fb fb fb fb fb fc fc fc fc ==================================================================