================================================================== BUG: KASAN: invalid-access in __kvm_pgtable_visit arch/arm64/kvm/hyp/pgtable.c:163 [inline] BUG: KASAN: invalid-access in __kvm_pgtable_walk+0x8e4/0xa68 arch/arm64/kvm/hyp/pgtable.c:237 Read of size 8 at addr 48f000001fb89000 by task syz.1.389/4793 Pointer tag: [48], memory tag: [fe] CPU: 0 UID: 0 PID: 4793 Comm: syz.1.389 Not tainted syzkaller #0 PREEMPT Hardware name: linux,dummy-virt (DT) Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xac/0x288 mm/kasan/report.c:378 print_report+0x84/0xa0 mm/kasan/report.c:482 kasan_report+0xb0/0x110 mm/kasan/report.c:595 kasan_tag_mismatch+0x28/0x3c mm/kasan/sw_tags.c:175 __hwasan_tag_mismatch+0x30/0x60 arch/arm64/lib/kasan_sw_tags.S:55 __kvm_pgtable_visit arch/arm64/kvm/hyp/pgtable.c:163 [inline] __kvm_pgtable_walk+0x8e4/0xa68 arch/arm64/kvm/hyp/pgtable.c:237 _kvm_pgtable_walk arch/arm64/kvm/hyp/pgtable.c:260 [inline] kvm_pgtable_walk+0x294/0x468 arch/arm64/kvm/hyp/pgtable.c:283 kvm_pgtable_stage2_destroy_range+0x60/0xb4 arch/arm64/kvm/hyp/pgtable.c:1563 stage2_destroy_range arch/arm64/kvm/mmu.c:924 [inline] kvm_stage2_destroy arch/arm64/kvm/mmu.c:935 [inline] kvm_free_stage2_pgd+0x198/0x28c arch/arm64/kvm/mmu.c:1112 kvm_uninit_stage2_mmu+0x20/0x38 arch/arm64/kvm/mmu.c:1023 kvm_arch_flush_shadow_all+0x1a8/0x1e0 arch/arm64/kvm/nested.c:1113 kvm_flush_shadow_all virt/kvm/kvm_main.c:343 [inline] kvm_mmu_notifier_release+0x48/0xa8 virt/kvm/kvm_main.c:884 mmu_notifier_unregister+0x128/0x42c mm/mmu_notifier.c:815 kvm_destroy_vm virt/kvm/kvm_main.c:1295 [inline] kvm_put_kvm+0x6a0/0xfa8 virt/kvm/kvm_main.c:1353 kvm_vm_release+0x58/0x78 virt/kvm/kvm_main.c:1376 __fput+0x4ac/0x980 fs/file_table.c:468 ____fput+0x20/0x58 fs/file_table.c:496 task_work_run+0x1bc/0x254 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x1bc/0x270 arch/arm64/kernel/entry-common.c:155 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:173 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:182 [inline] el0_svc+0xb8/0x164 arch/arm64/kernel/entry-common.c:880 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5fb89 flags: 0x1ffedc000000000(node=0|zone=0|lastcpupid=0x7ff|kasantag=0xb7) raw: 01ffedc000000000 ffffc1ffc07e0448 ffffc1ffc07e65c8 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: fff000001fb88e00: 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 fff000001fb88f00: 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 >fff000001fb89000: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ^ fff000001fb89100: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fff000001fb89200: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ================================================================== page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5fb89 flags: 0x1fff28000000000(node=0|zone=0|lastcpupid=0x7ff|kasantag=0xca) raw: 01fff28000000000 ffffc1ffc0797208 ffffc1ffc07e0448 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) ------------[ cut here ]------------ kernel BUG at ./include/linux/mm.h:1036! Internal error: Oops - BUG: 00000000f2000800 [#1] SMP Modules linked in: CPU: 0 UID: 0 PID: 4793 Comm: syz.1.389 Tainted: G B syzkaller #0 PREEMPT Tainted: [B]=BAD_PAGE Hardware name: linux,dummy-virt (DT) pstate: 61402009 (nZCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--) pc : put_page_testzero include/linux/mm.h:1036 [inline] pc : ___free_pages+0x140/0x1a4 mm/page_alloc.c:5228 lr : put_page_testzero include/linux/mm.h:1036 [inline] lr : ___free_pages+0x140/0x1a4 mm/page_alloc.c:5228 sp : ffff80008ceb79a0 x29: ffff80008ceb79a0 x28: 0000100000000000 x27: ffff8000801f1e00 x26: 0000000000040000 x25: ffffc1ffc0000000 x24: 01fff28000000000 x23: ffffc1ffc07ee274 x22: efff800000000000 x21: 0000000000000000 x20: 0000000000000000 x19: ffffc1ffc07ee240 x18: 00000000ddaf47bd x17: 0000000004b90a31 x16: 00000000dd5f82a5 x15: 000000009db29bb3 x14: 0000000040000000 x13: fff0000013393b08 x12: 0000000000000001 x11: 0000000000000000 x10: 0000000000ff0100 x9 : 32cb824b992c8600 x8 : 32cb824b992c8600 x7 : 0000000000000400 x6 : ffff80008039fbc8 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000010 x2 : 0000000000000002 x1 : 0000000100000000 x0 : 000000000000003e Call trace: put_page_testzero include/linux/mm.h:1036 [inline] (P) ___free_pages+0x140/0x1a4 mm/page_alloc.c:5228 (P) __free_pages mm/page_alloc.c:5260 [inline] free_pages mm/page_alloc.c:5277 [inline] free_pages_exact+0xcc/0xf0 mm/page_alloc.c:5371 kvm_s2_free_pages_exact+0x11c/0x158 arch/arm64/kvm/mmu.c:226 kvm_pgtable_stage2_destroy_pgd+0x128/0x1a0 arch/arm64/kvm/hyp/pgtable.c:1576 kvm_stage2_destroy arch/arm64/kvm/mmu.c:936 [inline] kvm_free_stage2_pgd+0x1e8/0x28c arch/arm64/kvm/mmu.c:1112 kvm_uninit_stage2_mmu+0x20/0x38 arch/arm64/kvm/mmu.c:1023 kvm_arch_flush_shadow_all+0x1a8/0x1e0 arch/arm64/kvm/nested.c:1113 kvm_flush_shadow_all virt/kvm/kvm_main.c:343 [inline] kvm_mmu_notifier_release+0x48/0xa8 virt/kvm/kvm_main.c:884 mmu_notifier_unregister+0x128/0x42c mm/mmu_notifier.c:815 kvm_destroy_vm virt/kvm/kvm_main.c:1295 [inline] kvm_put_kvm+0x6a0/0xfa8 virt/kvm/kvm_main.c:1353 kvm_vm_release+0x58/0x78 virt/kvm/kvm_main.c:1376 __fput+0x4ac/0x980 fs/file_table.c:468 ____fput+0x20/0x58 fs/file_table.c:496 task_work_run+0x1bc/0x254 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x1bc/0x270 arch/arm64/kernel/entry-common.c:155 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:173 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:182 [inline] el0_svc+0xb8/0x164 arch/arm64/kernel/entry-common.c:880 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Code: b00326a1 910e9421 aa1303e0 97d13ef9 (d4210000) ---[ end trace 0000000000000000 ]---