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Thu, 25 Dec 2025 23:48:22 -0800 (PST) Date: Thu, 25 Dec 2025 23:48:22 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <694e3dc6.050a0220.35954c.0066.GAE@google.com> Subject: [syzbot] [mm?] KASAN: slab-use-after-free Read in folio_remove_rmap_ptes From: syzbot To: Liam.Howlett@oracle.com, akpm@linux-foundation.org, david@kernel.org, harry.yoo@oracle.com, jannh@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, riel@surriel.com, syzkaller-bugs@googlegroups.com, vbabka@suse.cz Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Queue-Id: 21E09C000B X-Rspamd-Server: rspam10 X-Stat-Signature: 7y6iww4ufna33byh6kefer8d3qyxkomb X-HE-Tag: 1766735302-964742 X-HE-Meta: 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 UFwKMPQQ 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 wCbrnqqs 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, syzbot found the following issue on: HEAD commit: 9094662f6707 Merge tag 'ata-6.19-rc2' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17c4db1a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a11e0f726bfb6765 dashboard link: https://syzkaller.appspot.com/bug?extid=5272541ccbbb14e2ec30 compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-9094662f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/5bec9d32a91c/vmlinux-9094662f.xz kernel image: https://storage.googleapis.com/syzbot-assets/3df82e1a3cec/bzImage-9094662f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5272541ccbbb14e2ec30@syzkaller.appspotmail.com uprobe: syz.3.982:12970 failed to unregister, leaking uprobe ================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline] BUG: KASAN: slab-use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline] BUG: KASAN: slab-use-after-free in __folio_rmap_sanity_checks include/linux/rmap.h:462 [inline] BUG: KASAN: slab-use-after-free in __folio_remove_rmap mm/rmap.c:1663 [inline] BUG: KASAN: slab-use-after-free in folio_remove_rmap_ptes+0x245/0xfb0 mm/rmap.c:1779 Read of size 4 at addr ffff88802407b1a0 by task syz.3.982/12970 CPU: 2 UID: 0 PID: 12970 Comm: syz.3.982 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xcd/0x630 mm/kasan/report.c:482 kasan_report+0xe0/0x110 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:194 [inline] kasan_check_range+0x100/0x1b0 mm/kasan/generic.c:200 instrument_atomic_read include/linux/instrumented.h:68 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline] __folio_rmap_sanity_checks include/linux/rmap.h:462 [inline] __folio_remove_rmap mm/rmap.c:1663 [inline] folio_remove_rmap_ptes+0x245/0xfb0 mm/rmap.c:1779 zap_present_folio_ptes mm/memory.c:1650 [inline] zap_present_ptes mm/memory.c:1708 [inline] do_zap_pte_range mm/memory.c:1810 [inline] zap_pte_range mm/memory.c:1854 [inline] zap_pmd_range mm/memory.c:1946 [inline] zap_pud_range mm/memory.c:1975 [inline] zap_p4d_range mm/memory.c:1996 [inline] unmap_page_range+0x1b7d/0x43c0 mm/memory.c:2017 unmap_single_vma+0x153/0x240 mm/memory.c:2059 unmap_vmas+0x218/0x470 mm/memory.c:2101 exit_mmap+0x1b0/0xb60 mm/mmap.c:1277 __mmput+0x12a/0x410 kernel/fork.c:1173 mmput+0x62/0x70 kernel/fork.c:1196 exit_mm kernel/exit.c:581 [inline] do_exit+0x7d7/0x2bd0 kernel/exit.c:959 do_group_exit+0xd3/0x2a0 kernel/exit.c:1112 get_signal+0x2671/0x26d0 kernel/signal.c:3034 arch_do_signal_or_restart+0x8f/0x7e0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline] exit_to_user_mode_loop+0x8c/0x540 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x4ee/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2c0938f7c9 Code: Unable to access opcode bytes at 0x7f2c0938f79f. RSP: 002b:00007f2c0a231038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: fffffffffffffffc RBX: 00007f2c095e6090 RCX: 00007f2c0938f7c9 RDX: 0000000000000040 RSI: 00002000000003c0 RDI: 000000000000001c RBP: 00007f2c09413f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2c095e6128 R14: 00007f2c095e6090 R15: 00007ffd86729c78 Allocated by task 12971: kasan_save_stack+0x33/0x60 mm/kasan/common.c:56 kasan_save_track+0x14/0x30 mm/kasan/common.c:77 unpoison_slab_object mm/kasan/common.c:339 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:365 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_noprof+0x25e/0x770 mm/slub.c:5270 anon_vma_alloc mm/rmap.c:93 [inline] __anon_vma_prepare+0x344/0x5e0 mm/rmap.c:201 __vmf_anon_prepare+0x11c/0x240 mm/memory.c:3673 vmf_anon_prepare mm/internal.h:432 [inline] do_cow_fault mm/memory.c:5775 [inline] do_fault+0x18b/0x1ad0 mm/memory.c:5891 do_pte_missing mm/memory.c:4401 [inline] handle_pte_fault mm/memory.c:6273 [inline] __handle_mm_fault+0x1919/0x2bb0 mm/memory.c:6411 handle_mm_fault+0x3fe/0xad0 mm/memory.c:6580 faultin_page mm/gup.c:1126 [inline] __get_user_pages+0x54e/0x3590 mm/gup.c:1428 __get_user_pages_locked mm/gup.c:1692 [inline] get_user_pages_remote+0x243/0xab0 mm/gup.c:2614 uprobe_write+0x22b/0x24f0 kernel/events/uprobes.c:529 uprobe_write_opcode+0x99/0x1a0 kernel/events/uprobes.c:493 set_swbp+0x112/0x200 arch/x86/kernel/uprobes.c:1090 install_breakpoint+0x6a4/0xa20 kernel/events/uprobes.c:1170 uprobe_mmap+0x512/0x10e0 kernel/events/uprobes.c:1629 vma_complete+0xa09/0xe80 mm/vma.c:397 __split_vma+0xac3/0x1050 mm/vma.c:561 vms_gather_munmap_vmas+0x1cb/0x1340 mm/vma.c:1362 __mmap_setup mm/vma.c:2366 [inline] __mmap_region+0x47c/0x2a00 mm/vma.c:2690 mmap_region+0x1ab/0x3f0 mm/vma.c:2786 do_mmap+0xa3e/0x1210 mm/mmap.c:558 vm_mmap_pgoff+0x29e/0x470 mm/util.c:581 ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:604 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline] __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 0: kasan_save_stack+0x33/0x60 mm/kasan/common.c:56 kasan_save_track+0x14/0x30 mm/kasan/common.c:77 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2540 [inline] slab_free_after_rcu_debug+0x10c/0x300 mm/slub.c:6729 rcu_do_batch kernel/rcu/tree.c:2605 [inline] rcu_core+0x79c/0x15f0 kernel/rcu/tree.c:2857 handle_softirqs+0x219/0x950 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 Last potentially related work creation: kasan_save_stack+0x33/0x60 mm/kasan/common.c:56 kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556 slab_free_hook mm/slub.c:2501 [inline] slab_free mm/slub.c:6670 [inline] kmem_cache_free+0x15e/0x770 mm/slub.c:6781 anon_vma_free mm/rmap.c:136 [inline] __put_anon_vma+0x114/0x3a0 mm/rmap.c:2780 put_anon_vma include/linux/rmap.h:117 [inline] unlink_anon_vmas+0x58a/0x820 mm/rmap.c:443 dontunmap_complete mm/mremap.c:1265 [inline] move_vma+0x14de/0x1790 mm/mremap.c:1314 mremap_to+0x1b7/0x450 mm/mremap.c:1416 remap_move mm/mremap.c:1890 [inline] do_mremap+0x13a8/0x2020 mm/mremap.c:1933 __do_sys_mremap+0x119/0x170 mm/mremap.c:1997 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88802407b100 which belongs to the cache anon_vma of size 208 The buggy address is located 160 bytes inside of freed 208-byte region [ffff88802407b100, ffff88802407b1d0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2407a head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888021c50001 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801b44dcc0 ffffea0000f7d080 dead000000000002 raw: 0000000000000000 00000000801e001e 00000000f5000000 ffff888021c50001 head: 00fff00000000040 ffff88801b44dcc0 ffffea0000f7d080 dead000000000002 head: 0000000000000000 00000000801e001e 00000000f5000000 ffff888021c50001 head: 00fff00000000001 ffffea0000901e81 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (init), ts 24478689872, free_ts 23304373426 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1846 prep_new_page mm/page_alloc.c:1854 [inline] get_page_from_freelist+0xd0b/0x31a0 mm/page_alloc.c:3915 __alloc_frozen_pages_noprof+0x25f/0x2430 mm/page_alloc.c:5210 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2486 alloc_slab_page mm/slub.c:3075 [inline] allocate_slab mm/slub.c:3248 [inline] new_slab+0x2c3/0x430 mm/slub.c:3302 ___slab_alloc+0xe18/0x1c90 mm/slub.c:4656 __slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4779 __slab_alloc_node mm/slub.c:4855 [inline] slab_alloc_node mm/slub.c:5251 [inline] kmem_cache_alloc_noprof+0x44d/0x770 mm/slub.c:5270 anon_vma_alloc mm/rmap.c:93 [inline] __anon_vma_prepare+0x344/0x5e0 mm/rmap.c:201 __vmf_anon_prepare+0x11c/0x240 mm/memory.c:3673 vmf_anon_prepare mm/internal.h:432 [inline] do_cow_fault mm/memory.c:5775 [inline] do_fault+0x18b/0x1ad0 mm/memory.c:5891 do_pte_missing mm/memory.c:4401 [inline] handle_pte_fault mm/memory.c:6273 [inline] __handle_mm_fault+0x1919/0x2bb0 mm/memory.c:6411 handle_mm_fault+0x3fe/0xad0 mm/memory.c:6580 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x64/0xc0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] __free_frozen_pages+0x7df/0x1170 mm/page_alloc.c:2943 discard_slab mm/slub.c:3346 [inline] __put_partials+0x130/0x170 mm/slub.c:3886 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4c/0xf0 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:349 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] __do_kmalloc_node mm/slub.c:5656 [inline] __kmalloc_node_track_caller_noprof+0x30b/0x930 mm/slub.c:5764 __do_krealloc mm/slub.c:7014 [inline] krealloc_node_align_noprof+0xfb/0x3d0 mm/slub.c:7073 krealloc_array_noprof include/linux/slab.h:1034 [inline] add_sysfs_param+0x19c/0xa10 kernel/params.c:663 kernel_add_sysfs_param kernel/params.c:812 [inline] param_sysfs_builtin kernel/params.c:851 [inline] param_sysfs_builtin_init+0x307/0x4c0 kernel/params.c:987 do_one_initcall+0x123/0x680 init/main.c:1378 do_initcall_level init/main.c:1440 [inline] do_initcalls init/main.c:1456 [inline] do_basic_setup init/main.c:1475 [inline] kernel_init_freeable+0x5c8/0x920 init/main.c:1688 kernel_init+0x1c/0x2b0 init/main.c:1578 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Memory state around the buggy address: ffff88802407b080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88802407b100: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802407b180: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc ^ ffff88802407b200: fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802407b280: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ================================================================== --- This report is generated by a bot. 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