================================================================== 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 d7f0000019598000 by task syz.2.361/4828 Pointer tag: [d7], memory tag: [fe] CPU: 0 UID: 0 PID: 4828 Comm: syz.2.361 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 mn_hlist_release mm/mmu_notifier.c:321 [inline] __mmu_notifier_release+0x310/0x614 mm/mmu_notifier.c:359 mmu_notifier_release include/linux/mmu_notifier.h:402 [inline] exit_mmap+0xb8/0xbb8 mm/mmap.c:1263 __mmput+0x10c/0x528 kernel/fork.c:1130 mmput+0x70/0xac kernel/fork.c:1152 exit_mm+0x158/0x258 kernel/exit.c:582 do_exit+0x788/0x2378 kernel/exit.c:949 do_group_exit+0x1d4/0x2ac kernel/exit.c:1102 get_signal+0x1440/0x1554 kernel/signal.c:3034 do_signal+0x23c/0x4dd0 arch/arm64/kernel/signal.c:1618 do_notify_resume+0xb0/0x270 arch/arm64/kernel/entry-common.c:152 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:0x59598 flags: 0x1ffca0000000000(node=0|zone=0|lastcpupid=0x7ff|kasantag=0x28) raw: 01ffca0000000000 ffffc1ffc071e008 ffffc1ffc0478848 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: fff0000019597e00: c1 c1 c1 c1 c1 c1 c1 c1 c1 c1 c1 c1 c1 c1 c1 c1 fff0000019597f00: c1 c1 c1 c1 c1 c1 c1 c1 fe fe fe fe fe fe fe fe >fff0000019598000: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ^ fff0000019598100: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fff0000019598200: 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:0x59598 flags: 0x1ffcb0000000000(node=0|zone=0|lastcpupid=0x7ff|kasantag=0x2c) raw: 01ffcb0000000000 ffffc1ffc071e048 fff0000072d7e420 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: 4828 Comm: syz.2.361 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 : folio_put_testzero include/linux/mm.h:1042 [inline] pc : folio_put include/linux/mm.h:1359 [inline] pc : put_page include/linux/mm.h:1429 [inline] pc : kvm_s2_put_page+0x374/0x3a0 arch/arm64/kvm/mmu.c:264 lr : put_page_testzero include/linux/mm.h:1036 [inline] lr : folio_put_testzero include/linux/mm.h:1042 [inline] lr : folio_put include/linux/mm.h:1359 [inline] lr : put_page include/linux/mm.h:1429 [inline] lr : kvm_s2_put_page+0x374/0x3a0 arch/arm64/kvm/mmu.c:264 sp : ffff80008f757450 x29: ffff80008f757450 x28: d7f0000019598008 x27: d7f0000019598008 x26: 00000000000000ff x25: ffff800087396000 x24: ffffc1ffc0000000 x23: ffffc1ffc0656608 x22: 0000000000000000 x21: ffffc1ffc0656634 x20: 0000000000000000 x19: ffffc1ffc0656600 x18: 00000000e8937c3f x17: 0000000002251f4d x16: 00000000e8935ff7 x15: 000000009cd39085 x14: 0000000000000000 x13: fff000000e683b08 x12: 0000000000000001 x11: 0000000000000000 x10: 0000000000ff0100 x9 : 9cbbe23ee948e200 x8 : 9cbbe23ee948e200 x7 : 0000000000000000 x6 : ffff80008048ab34 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff80008074aff8 x2 : 0000000000000002 x1 : 0000000100000000 x0 : 000000000000003e Call trace: put_page_testzero include/linux/mm.h:1036 [inline] (P) folio_put_testzero include/linux/mm.h:1042 [inline] (P) folio_put include/linux/mm.h:1359 [inline] (P) put_page include/linux/mm.h:1429 [inline] (P) kvm_s2_put_page+0x374/0x3a0 arch/arm64/kvm/mmu.c:264 (P) stage2_free_walker+0xdc/0x264 arch/arm64/kvm/hyp/pgtable.c:1546 kvm_pgtable_visitor_cb arch/arm64/kvm/hyp/pgtable.c:130 [inline] __kvm_pgtable_visit arch/arm64/kvm/hyp/pgtable.c:-1 [inline] __kvm_pgtable_walk+0x4a8/0xa68 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 mn_hlist_release mm/mmu_notifier.c:321 [inline] __mmu_notifier_release+0x310/0x614 mm/mmu_notifier.c:359 mmu_notifier_release include/linux/mmu_notifier.h:402 [inline] exit_mmap+0xb8/0xbb8 mm/mmap.c:1263 __mmput+0x10c/0x528 kernel/fork.c:1130 mmput+0x70/0xac kernel/fork.c:1152 exit_mm+0x158/0x258 kernel/exit.c:582 do_exit+0x788/0x2378 kernel/exit.c:949 do_group_exit+0x1d4/0x2ac kernel/exit.c:1102 get_signal+0x1440/0x1554 kernel/signal.c:3034 do_signal+0x23c/0x4dd0 arch/arm64/kernel/signal.c:1618 do_notify_resume+0xb0/0x270 arch/arm64/kernel/entry-common.c:152 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: 900377c1 910e9421 aa1303e0 97f9c9f2 (d4210000) ---[ end trace 0000000000000000 ]---