loop2: detected capacity change from 0 to 1024
EXT4-fs (loop2): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
==================================================================
BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x8e9/0x1e20
Read of size 18446744073709551588 at addr ffff88802fcfc040 by task syz.2.271/6648

CPU: 0 UID: 0 PID: 6648 Comm: syz.2.271 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 print_report+0xca/0x240
 kasan_report+0x118/0x150
 kasan_check_range+0x2b0/0x2c0
 __asan_memmove+0x29/0x70
 ext4_xattr_set_entry+0x8e9/0x1e20
 ext4_xattr_block_set+0x872/0x2ac0
 ext4_xattr_set_handle+0xdfb/0x1590
 ext4_xattr_set+0x230/0x320
 __vfs_setxattr+0x43c/0x480
 __vfs_setxattr_noperm+0x12d/0x660
 vfs_setxattr+0x16b/0x2f0
 filename_setxattr+0x274/0x600
 path_setxattrat+0x364/0x3a0
 __x64_sys_setxattr+0xbc/0xe0
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f700ff8eba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7010d70038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007f70101d5fa0 RCX: 00007f700ff8eba9
RDX: 00002000000013c0 RSI: 0000200000000140 RDI: 0000200000000100
RBP: 00007f7010011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000700 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f70101d6038 R14: 00007f70101d5fa0 R15: 00007ffc8ed212b8
 </TASK>

Allocated by task 6648:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_node_track_caller_noprof+0x568/0x800
 kmemdup_noprof+0x2b/0x70
 ext4_xattr_block_set+0x781/0x2ac0
 ext4_xattr_set_handle+0xdfb/0x1590
 ext4_xattr_set+0x230/0x320
 __vfs_setxattr+0x43c/0x480
 __vfs_setxattr_noperm+0x12d/0x660
 vfs_setxattr+0x16b/0x2f0
 filename_setxattr+0x274/0x600
 path_setxattrat+0x364/0x3a0
 __x64_sys_setxattr+0xbc/0xe0
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88802fcfc000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 64 bytes inside of
 1024-byte region [ffff88802fcfc000, ffff88802fcfc400)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2fcf8
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801a841dc0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801a841dc0 dead000000000100 dead000000000122
head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea0000bf3e01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5869, tgid 5869 (kworker/u8:3), ts 58811381272, free_ts 0
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x8a/0x330
 ___slab_alloc+0xbd1/0x13f0
 __slab_alloc+0x55/0xa0
 __kmalloc_noprof+0x471/0x7f0
 ___neigh_create+0x6d5/0x2260
 ip6_finish_output2+0x1175/0x1480
 ip6_output+0x340/0x550
 ndisc_send_skb+0xbce/0x1510
 ndisc_send_ns+0xcb/0x150
 addrconf_dad_work+0xaae/0x14b0
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88802fcfbf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802fcfbf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88802fcfc000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                           ^
 ffff88802fcfc080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88802fcfc100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
