loop0: detected capacity change from 0 to 1024
EXT4-fs (loop0): mounted filesystem without journal. Quota mode: none.
==================================================================
BUG: KASAN: slab-out-of-bounds in ext4_xattr_list_entries+0x278/0x334 fs/ext4/xattr.c:670
Read of size 4 at addr ffff0000f5582028 by task syz.0.55/4605

CPU: 0 PID: 4605 Comm: syz.0.55 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
 dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 print_address_description+0x88/0x218 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:420
 kasan_report+0xa8/0xfc mm/kasan/report.c:524
 __asan_report_load4_noabort+0x2c/0x38 mm/kasan/report_generic.c:350
 ext4_xattr_list_entries+0x278/0x334 fs/ext4/xattr.c:670
 ext4_xattr_ibody_list fs/ext4/xattr.c:740 [inline]
 ext4_listxattr+0x1a8/0x4e8 fs/ext4/xattr.c:765
 vfs_listxattr fs/xattr.c:457 [inline]
 listxattr+0x29c/0x3cc fs/xattr.c:804
 path_listxattr+0xe0/0x1b8 fs/xattr.c:828
 __do_sys_listxattr fs/xattr.c:840 [inline]
 __se_sys_listxattr fs/xattr.c:837 [inline]
 __arm64_sys_listxattr+0x80/0x94 fs/xattr.c:837
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Allocated by task 4332:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:53
 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:375 [inline]
 __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:384
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 kmalloc_trace+0x7c/0x94 mm/slab_common.c:1031
 kmalloc include/linux/slab.h:563 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 ref_tracker_alloc+0x138/0x3f0 lib/ref_tracker.c:85
 __netdev_tracker_alloc include/linux/netdevice.h:4051 [inline]
 netdev_hold include/linux/netdevice.h:4080 [inline]
 qdisc_alloc+0x5b8/0x8b8 net/sched/sch_generic.c:989
 qdisc_create_dflt+0x6c/0x560 net/sched/sch_generic.c:1012
 attach_one_default_qdisc net/sched/sch_generic.c:1176 [inline]
 netdev_for_each_tx_queue include/linux/netdevice.h:2465 [inline]
 attach_default_qdiscs net/sched/sch_generic.c:1194 [inline]
 dev_activate+0x2f8/0xf60 net/sched/sch_generic.c:1253
 __dev_open+0x384/0x4d4 net/core/dev.c:1510
 __dev_change_flags+0x1ac/0x564 net/core/dev.c:8651
 dev_change_flags+0x80/0x154 net/core/dev.c:8722
 do_setlink+0xa5c/0x3434 net/core/rtnetlink.c:2833
 __rtnl_newlink net/core/rtnetlink.c:3608 [inline]
 rtnl_newlink+0x13cc/0x1a50 net/core/rtnetlink.c:3655
 rtnetlink_rcv_msg+0x698/0xcdc net/core/rtnetlink.c:6150
 netlink_rcv_skb+0x218/0x3e8 net/netlink/af_netlink.c:2511
 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6168
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x60c/0x814 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x6f4/0x9c0 net/netlink/af_netlink.c:1872
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 __sys_sendto+0x324/0x440 net/socket.c:2152
 __do_sys_sendto net/socket.c:2164 [inline]
 __se_sys_sendto net/socket.c:2160 [inline]
 __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2160
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the object at ffff0000f5582000
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 40 bytes inside of
 128-byte region [ffff0000f5582000, ffff0000f5582080)

The buggy address belongs to the physical page:
page:00000000e62e85d3 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x135582
flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000200 dead000000000100 dead000000000122 ffff0000c0002300
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000f5581f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000f5581f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000f5582000: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
                                  ^
 ffff0000f5582080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000f5582100: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc
==================================================================