================================================================== BUG: KASAN: double-free or invalid-free in pgtable_pte_page_dtor include/linux/mm.h:2202 [inline] BUG: KASAN: double-free or invalid-free in ___pte_free_tlb+0x29/0x180 arch/x86/mm/pgtable.c:55 CPU: 1 PID: 26083 Comm: syz-executor.1 Not tainted 5.9.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d6/0x29e lib/dump_stack.c:118 print_address_description+0x66/0x620 mm/kasan/report.c:383 kasan_report_invalid_free+0x54/0xd0 mm/kasan/report.c:477 __kasan_slab_free+0x9a/0x110 mm/kasan/common.c:410 __cache_free mm/slab.c:3418 [inline] kmem_cache_free+0x82/0xf0 mm/slab.c:3693 pgtable_pte_page_dtor include/linux/mm.h:2202 [inline] ___pte_free_tlb+0x29/0x180 arch/x86/mm/pgtable.c:55 __pte_free_tlb arch/x86/include/asm/pgalloc.h:61 [inline] free_pte_range mm/memory.c:221 [inline] free_pmd_range mm/memory.c:239 [inline] free_pud_range mm/memory.c:273 [inline] free_p4d_range mm/memory.c:307 [inline] free_pgd_range+0x7d2/0xec0 mm/memory.c:387 free_pgtables+0x29a/0x2d0 mm/memory.c:419 exit_mmap+0x285/0x550 mm/mmap.c:3184 __mmput+0x113/0x370 kernel/fork.c:1076 exit_mm+0x4cd/0x550 kernel/exit.c:483 do_exit+0x576/0x1f20 kernel/exit.c:793 do_group_exit+0x161/0x2d0 kernel/exit.c:903 get_signal+0x13bb/0x1d50 kernel/signal.c:2757 arch_do_signal+0x33/0x610 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:159 [inline] exit_to_user_mode_prepare+0x8d/0x1e0 kernel/entry/common.c:190 syscall_exit_to_user_mode+0x82/0x1d0 kernel/entry/common.c:265 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d5f9 Code: Bad RIP value. RSP: 002b:00007f64a4d3acf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000118cf48 RCX: 000000000045d5f9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000118cf48 RBP: 000000000118cf40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffd2a4f628f R14: 00007f64a4d3b9c0 R15: 000000000118cf4c Allocated by task 6856: kasan_save_stack mm/kasan/common.c:48 [inline] kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc+0x100/0x130 mm/kasan/common.c:461 slab_post_alloc_hook+0x3e/0x290 mm/slab.h:518 slab_alloc mm/slab.c:3312 [inline] kmem_cache_alloc+0x1c1/0x2d0 mm/slab.c:3482 ptlock_alloc+0x1c/0x70 mm/memory.c:5065 ptlock_init include/linux/mm.h:2166 [inline] pgtable_pte_page_ctor include/linux/mm.h:2193 [inline] __pte_alloc_one include/asm-generic/pgalloc.h:66 [inline] pte_alloc_one+0x6a/0x180 arch/x86/mm/pgtable.c:33 __pte_alloc+0x1d/0x2a0 mm/memory.c:429 copy_pte_range mm/memory.c:829 [inline] copy_pmd_range mm/memory.c:905 [inline] copy_pud_range mm/memory.c:939 [inline] copy_p4d_range mm/memory.c:961 [inline] copy_page_range+0x2458/0x2950 mm/memory.c:1023 dup_mmap+0x982/0xd60 kernel/fork.c:592 dup_mm+0x98/0x320 kernel/fork.c:1354 copy_mm kernel/fork.c:1410 [inline] copy_process+0x1fdc/0x5200 kernel/fork.c:2069 _do_fork+0x1ab/0x6d0 kernel/fork.c:2428 __do_sys_clone kernel/fork.c:2545 [inline] __se_sys_clone kernel/fork.c:2529 [inline] __x64_sys_clone+0x1e9/0x230 kernel/fork.c:2529 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 26083: kasan_save_stack mm/kasan/common.c:48 [inline] kasan_set_track+0x3d/0x70 mm/kasan/common.c:56 kasan_set_free_info+0x17/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0xdd/0x110 mm/kasan/common.c:422 __cache_free mm/slab.c:3418 [inline] kmem_cache_free+0x82/0xf0 mm/slab.c:3693 pgtable_pte_page_dtor include/linux/mm.h:2202 [inline] ___pte_free_tlb+0x29/0x180 arch/x86/mm/pgtable.c:55 __pte_free_tlb arch/x86/include/asm/pgalloc.h:61 [inline] free_pte_range mm/memory.c:221 [inline] free_pmd_range mm/memory.c:239 [inline] free_pud_range mm/memory.c:273 [inline] free_p4d_range mm/memory.c:307 [inline] free_pgd_range+0x7d2/0xec0 mm/memory.c:387 free_pgtables+0x29a/0x2d0 mm/memory.c:419 exit_mmap+0x285/0x550 mm/mmap.c:3184 __mmput+0x113/0x370 kernel/fork.c:1076 exit_mm+0x4cd/0x550 kernel/exit.c:483 do_exit+0x576/0x1f20 kernel/exit.c:793 do_group_exit+0x161/0x2d0 kernel/exit.c:903 get_signal+0x13bb/0x1d50 kernel/signal.c:2757 arch_do_signal+0x33/0x610 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:159 [inline] exit_to_user_mode_prepare+0x8d/0x1e0 kernel/entry/common.c:190 syscall_exit_to_user_mode+0x82/0x1d0 kernel/entry/common.c:265 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff888000117000 which belongs to the cache page->ptl of size 64 The buggy address is located 0 bytes inside of 64-byte region [ffff888000117000, ffff888000117040) The buggy address belongs to the page: page:00000000d8cb99e1 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x117 flags: 0x7ffe0000000200(slab) raw: 007ffe0000000200 ffffea00029c9808 ffffea0002784948 ffff8880aa44fc00 raw: 0000000000000000 ffff888000117000 000000010000002a 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888000116f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888000116f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888000117000: fa fb fb fb fb fb fb fb fc fc fc fc 00 00 00 00 ^ ffff888000117080: 00 00 00 00 fc fc fc fc fb fb fb fb fb fb fb fb ffff888000117100: fc fc fc fc 00 00 00 00 00 00 00 00 fc fc fc fc ==================================================================