================================================================== BUG: KASAN: slab-out-of-bounds in __ptep_get arch/arm64/include/asm/pgtable.h:315 [inline] BUG: KASAN: slab-out-of-bounds in __clear_young_dirty_ptes arch/arm64/include/asm/pgtable.h:1309 [inline] BUG: KASAN: slab-out-of-bounds in contpte_clear_young_dirty_ptes+0x104/0x214 arch/arm64/mm/contpte.c:389 Read of size 8 at addr ffff000017dc70b0 by task syz-executor.0/9247 CPU: 0 PID: 9247 Comm: syz-executor.0 Tainted: G W 6.10.0-rc1-syzkaller-00027-g4a4be1ad3a6e #0 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0x9c/0x11c arch/arm64/kernel/stacktrace.c:317 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:324 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xa4/0xf4 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xf4/0x5a4 mm/kasan/report.c:488 kasan_report+0xc8/0x108 mm/kasan/report.c:601 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 __ptep_get arch/arm64/include/asm/pgtable.h:315 [inline] __clear_young_dirty_ptes arch/arm64/include/asm/pgtable.h:1309 [inline] contpte_clear_young_dirty_ptes+0x104/0x214 arch/arm64/mm/contpte.c:389 clear_young_dirty_ptes arch/arm64/include/asm/pgtable.h:1715 [inline] madvise_free_pte_range+0xce8/0x10e0 mm/madvise.c:767 walk_pmd_range mm/pagewalk.c:143 [inline] walk_pud_range mm/pagewalk.c:221 [inline] walk_p4d_range mm/pagewalk.c:256 [inline] walk_pgd_range+0x8e8/0x14a4 mm/pagewalk.c:293 __walk_page_range+0x420/0x5e4 mm/pagewalk.c:395 walk_page_range+0x370/0x6f8 mm/pagewalk.c:521 madvise_free_single_vma+0x300/0x5a8 mm/madvise.c:815 madvise_dontneed_free mm/madvise.c:929 [inline] madvise_vma_behavior+0x30c/0x1028 mm/madvise.c:1046 madvise_walk_vmas+0x114/0x210 mm/madvise.c:1268 do_madvise+0x20c/0x6c4 mm/madvise.c:1464 __do_sys_madvise mm/madvise.c:1481 [inline] __se_sys_madvise mm/madvise.c:1479 [inline] __arm64_sys_madvise+0x88/0xdc mm/madvise.c:1479 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x6c/0x25c arch/arm64/kernel/syscall.c:48 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:133 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x50/0x180 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Allocated by task 3220: kasan_save_stack+0x3c/0x64 mm/kasan/common.c:47 kasan_save_track+0x20/0x3c mm/kasan/common.c:68 kasan_save_alloc_info+0x40/0x54 mm/kasan/generic.c:565 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x8c/0x90 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3940 [inline] slab_alloc_node mm/slub.c:4000 [inline] kmem_cache_alloc_noprof+0x128/0x2e0 mm/slub.c:4007 __kernfs_new_node+0xd0/0x704 fs/kernfs/dir.c:624 kernfs_new_node+0x100/0x1f0 fs/kernfs/dir.c:700 __kernfs_create_file+0x38/0x2dc fs/kernfs/file.c:1034 sysfs_add_file_mode_ns+0x164/0x384 fs/sysfs/file.c:307 create_files fs/sysfs/group.c:76 [inline] internal_create_group+0x3dc/0xb80 fs/sysfs/group.c:180 internal_create_groups+0x80/0x128 fs/sysfs/group.c:220 sysfs_create_groups+0x18/0x24 fs/sysfs/group.c:246 device_add_groups drivers/base/core.c:2823 [inline] device_add_attrs drivers/base/core.c:2943 [inline] device_add+0x600/0x12b8 drivers/base/core.c:3675 netdev_register_kobject+0xe0/0x2b8 net/core/net-sysfs.c:2136 register_netdevice+0xbe0/0x13e4 net/core/dev.c:10374 register_vlan_dev+0x258/0x69c net/8021q/vlan.c:179 vlan_newlink+0x31c/0x51c net/8021q/vlan_netlink.c:193 rtnl_newlink_create net/core/rtnetlink.c:3510 [inline] __rtnl_newlink+0xb68/0x11dc net/core/rtnetlink.c:3730 rtnl_newlink+0x6c/0xa4 net/core/rtnetlink.c:3743 rtnetlink_rcv_msg+0x2e8/0x8bc net/core/rtnetlink.c:6595 netlink_rcv_skb+0x18c/0x330 net/netlink/af_netlink.c:2564 rtnetlink_rcv+0x18/0x24 net/core/rtnetlink.c:6613 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline] netlink_unicast+0x3bc/0x660 net/netlink/af_netlink.c:1361 netlink_sendmsg+0x654/0xa44 net/netlink/af_netlink.c:1905 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0xc8/0x168 net/socket.c:745 __sys_sendto+0x1a8/0x254 net/socket.c:2192 __do_sys_sendto net/socket.c:2204 [inline] __se_sys_sendto net/socket.c:2200 [inline] __arm64_sys_sendto+0xc0/0x134 net/socket.c:2200 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x6c/0x25c arch/arm64/kernel/syscall.c:48 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:133 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x50/0x180 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 The buggy address belongs to the object at ffff000017dc7000 which belongs to the cache kernfs_node_cache of size 176 The buggy address is located 0 bytes to the right of allocated 176-byte region [ffff000017dc7000, ffff000017dc70b0) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x57dc7 flags: 0x1ffc00000000000(node=0|zone=0|lastcpupid=0x7ff) page_type: 0xffffefff(slab) raw: 01ffc00000000000 ffff00000a14d280 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000110011 00000001ffffefff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff000017dc6f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff000017dc7000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff000017dc7080: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 ^ ffff000017dc7100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff000017dc7180: 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 00 00 ==================================================================