EXT4-fs (loop1): mounted filesystem without journal. Quota mode: none. ================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x965/0x1e90 fs/ext4/xattr.c:1729 Read of size 18446744073709551588 at addr ffff888075770840 by task syz.1.261/5330 CPU: 0 PID: 5330 Comm: syz.1.261 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x235/0x290 mm/kasan/generic.c:189 memmove+0x25/0x60 mm/kasan/shadow.c:54 ext4_xattr_set_entry+0x965/0x1e90 fs/ext4/xattr.c:1729 ext4_xattr_block_set+0xae4/0x32b0 fs/ext4/xattr.c:1976 ext4_xattr_set_handle+0x1338/0x1570 fs/ext4/xattr.c:2398 ext4_xattr_set+0x242/0x320 fs/ext4/xattr.c:2500 __vfs_setxattr+0x3e0/0x420 fs/xattr.c:182 __vfs_setxattr_noperm+0x129/0x5e0 fs/xattr.c:216 vfs_setxattr+0x167/0x2e0 fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x346/0x360 fs/xattr.c:617 path_setxattr+0x147/0x290 fs/xattr.c:636 __do_sys_lsetxattr fs/xattr.c:659 [inline] __se_sys_lsetxattr fs/xattr.c:655 [inline] __x64_sys_lsetxattr+0xb4/0xd0 fs/xattr.c:655 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7ffa1e19acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffa1f002028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd RAX: ffffffffffffffda RBX: 00007ffa1e415fa0 RCX: 00007ffa1e19acb9 RDX: 0000200000000000 RSI: 0000200000000180 RDI: 00002000000001c0 RBP: 00007ffa1e208bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000361 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffa1e416038 R14: 00007ffa1e415fa0 R15: 00007ffd5d6ead48 Allocated by task 5330: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc_node_track_caller+0xae/0x230 mm/slab_common.c:956 kmemdup+0x27/0x60 mm/util.c:129 kmemdup include/linux/fortify-string.h:585 [inline] ext4_xattr_block_set+0x9e6/0x32b0 fs/ext4/xattr.c:1924 ext4_xattr_set_handle+0x1338/0x1570 fs/ext4/xattr.c:2398 ext4_xattr_set+0x242/0x320 fs/ext4/xattr.c:2500 __vfs_setxattr+0x3e0/0x420 fs/xattr.c:182 __vfs_setxattr_noperm+0x129/0x5e0 fs/xattr.c:216 vfs_setxattr+0x167/0x2e0 fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x346/0x360 fs/xattr.c:617 path_setxattr+0x147/0x290 fs/xattr.c:636 __do_sys_lsetxattr fs/xattr.c:659 [inline] __se_sys_lsetxattr fs/xattr.c:655 [inline] __x64_sys_lsetxattr+0xb4/0xd0 fs/xattr.c:655 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486 call_rcu+0x14f/0x990 kernel/rcu/tree.c:2849 process_one_work+0x8a2/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1270 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff888075770800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 64 bytes inside of 1024-byte region [ffff888075770800, ffff888075770c00) The buggy address belongs to the physical page: page:ffffea0001d5dc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x75770 head:ffffea0001d5dc00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0000992a00 dead000000000003 ffff888017441dc0 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4267, tgid 4267 (syz-executor), ts 73048593245, free_ts 73002128223 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x1a1e/0x1ab0 mm/page_alloc.c:4328 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5614 alloc_slab_page+0x5d/0x160 mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x87/0x2c0 mm/slub.c:1997 ___slab_alloc+0xbc6/0x1240 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] __kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3398 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc_node_track_caller+0x9e/0x230 mm/slab_common.c:956 kmalloc_reserve net/core/skbuff.c:446 [inline] __alloc_skb+0x22a/0x7e0 net/core/skbuff.c:515 alloc_skb include/linux/skbuff.h:1271 [inline] nlmsg_new include/net/netlink.h:991 [inline] inet6_rt_notify+0xb0/0x240 net/ipv6/route.c:6239 fib6_add_rt2node net/ipv6/ip6_fib.c:1261 [inline] fib6_add+0x1db0/0x3d10 net/ipv6/ip6_fib.c:1490 __ip6_ins_rt net/ipv6/route.c:1345 [inline] ip6_ins_rt+0xd3/0x130 net/ipv6/route.c:1355 __ipv6_ifa_notify+0x4e7/0xe60 net/ipv6/addrconf.c:6214 ipv6_ifa_notify net/ipv6/addrconf.c:6253 [inline] add_addr+0x1b3/0x2c0 net/ipv6/addrconf.c:3153 add_v4_addrs+0x76e/0xcc0 net/ipv6/addrconf.c:3209 addrconf_gre_config net/ipv6/addrconf.c:3489 [inline] addrconf_init_auto_addrs+0x7bb/0xaf0 net/ipv6/addrconf.c:3504 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare mm/page_alloc.c:1509 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3384 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3479 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:306 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x4b/0x480 mm/slab.h:737 slab_alloc_node mm/slub.c:3359 [inline] __kmem_cache_alloc_node+0x140/0x260 mm/slub.c:3398 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1026 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] ref_tracker_alloc+0x14e/0x4b0 lib/ref_tracker.c:85 __netdev_tracker_alloc include/linux/netdevice.h:4051 [inline] netdev_hold include/linux/netdevice.h:4080 [inline] netdev_queue_add_kobject net/core/net-sysfs.c:1661 [inline] netdev_queue_update_kobjects+0x18d/0x480 net/core/net-sysfs.c:1716 register_queue_kobjects net/core/net-sysfs.c:1777 [inline] netdev_register_kobject+0x273/0x320 net/core/net-sysfs.c:2017 register_netdevice+0x12dd/0x1ae0 net/core/dev.c:10204 nsim_init_netdevsim drivers/net/netdevsim/netdev.c:317 [inline] nsim_create+0x35f/0x410 drivers/net/netdevsim/netdev.c:365 __nsim_dev_port_add+0x703/0xb70 drivers/net/netdevsim/dev.c:1396 nsim_dev_port_add_all+0x35/0xe0 drivers/net/netdevsim/dev.c:1454 nsim_drv_probe+0x841/0xb20 drivers/net/netdevsim/dev.c:1608 Memory state around the buggy address: ffff888075770700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888075770780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888075770800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888075770880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888075770900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 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