==================================================================
BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x1a71/0x21d0 fs/ext4/xattr.c:1699
Read of size 18446744073709550592 at addr ffff888118cccc00 by task syz.2.7236/26948

CPU: 1 PID: 26948 Comm: syz.2.7236 Tainted: G        W          syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 __dump_stack+0x21/0x24 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x71/0x200 mm/kasan/report.c:316
 print_report+0x4a/0x60 mm/kasan/report.c:420
 kasan_report+0x122/0x150 mm/kasan/report.c:524
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189
 memmove+0x2d/0x70 mm/kasan/shadow.c:54
 ext4_xattr_set_entry+0x1a71/0x21d0 fs/ext4/xattr.c:1699
 ext4_xattr_block_set+0xad3/0x3260 fs/ext4/xattr.c:1989
 ext4_xattr_set_handle+0xbc4/0x12c0 fs/ext4/xattr.c:2414
 ext4_xattr_set+0x242/0x320 fs/ext4/xattr.c:2516
 ext4_xattr_trusted_set+0x3c/0x50 fs/ext4/xattr_trusted.c:38
 __vfs_setxattr+0x3f2/0x440 fs/xattr.c:182
 __vfs_setxattr_noperm+0x12a/0x5e0 fs/xattr.c:216
 __vfs_setxattr_locked+0x212/0x230 fs/xattr.c:277
 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+0xc2/0xe0 fs/xattr.c:655
 x64_sys_call+0x8b7/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:190
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f379b59acb9
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:00007f379c413028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd
RAX: ffffffffffffffda RBX: 00007f379b816090 RCX: 00007f379b59acb9
RDX: 0000200000000300 RSI: 00002000000000c0 RDI: 0000200000000100
RBP: 00007f379b608bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fe37 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f379b816128 R14: 00007f379b816090 R15: 00007ffdc8013a58
 </TASK>

Allocated by task 26948:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 kasan_save_alloc_info+0x25/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:379 [inline]
 __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:388
 kasan_kmalloc include/linux/kasan.h:212 [inline]
 __do_kmalloc_node mm/slab_common.c:938 [inline]
 __kmalloc_node_track_caller+0xb1/0x1e0 mm/slab_common.c:958
 kmemdup+0x2b/0x60 mm/util.c:134
 kmemdup include/linux/fortify-string.h:585 [inline]
 ext4_xattr_block_set+0x9d5/0x3260 fs/ext4/xattr.c:1937
 ext4_xattr_set_handle+0xbc4/0x12c0 fs/ext4/xattr.c:2414
 ext4_xattr_set+0x242/0x320 fs/ext4/xattr.c:2516
 ext4_xattr_trusted_set+0x3c/0x50 fs/ext4/xattr_trusted.c:38
 __vfs_setxattr+0x3f2/0x440 fs/xattr.c:182
 __vfs_setxattr_noperm+0x12a/0x5e0 fs/xattr.c:216
 __vfs_setxattr_locked+0x212/0x230 fs/xattr.c:277
 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+0xc2/0xe0 fs/xattr.c:655
 x64_sys_call+0x8b7/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:190
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Last potentially related work creation:
 kasan_save_stack+0x3a/0x60 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xb6/0xc0 mm/kasan/generic.c:486
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496
 kvfree_call_rcu+0x8b/0x7c0 kernel/rcu/tree.c:3445
 drop_sysctl_table+0x2f5/0x430 fs/proc/proc_sysctl.c:1731
 unregister_sysctl_table+0x75/0x120 fs/proc/proc_sysctl.c:1769
 unregister_net_sysctl_table+0x15/0x20 net/sysctl_net.c:175
 neigh_sysctl_unregister+0x78/0x90 net/core/neighbour.c:3871
 addrconf_sysctl_unregister net/ipv6/addrconf.c:7249 [inline]
 addrconf_ifdown+0x1690/0x1950 net/ipv6/addrconf.c:3977
 addrconf_notify+0x39f/0xe40 net/ipv6/addrconf.c:-1
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0xa1/0x110 kernel/notifier.c:455
 call_netdevice_notifiers_info net/core/dev.c:2009 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2047 [inline]
 call_netdevice_notifiers net/core/dev.c:2061 [inline]
 unregister_netdevice_many+0x102c/0x18e0 net/core/dev.c:10967
 default_device_exit_batch+0x9dc/0xa70 net/core/dev.c:11480
 ops_exit_list net/core/net_namespace.c:177 [inline]
 cleanup_net+0x635/0xb10 net/core/net_namespace.c:604
 process_one_work+0x71f/0xc40 kernel/workqueue.c:2302
 worker_thread+0xa29/0x11e0 kernel/workqueue.c:2449
 kthread+0x281/0x320 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

The buggy address belongs to the object at ffff888118ccc800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 0 bytes to the right of
 1024-byte region [ffff888118ccc800, ffff888118cccc00)

The buggy address belongs to the physical page:
page:ffffea0004633200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x118cc8
head:ffffea0004633200 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 0000000000000000 dead000000000001 ffff888100043080
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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 102, tgid 102 (udevd), ts 5039566702, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2643
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2650
 get_page_from_freelist+0x2d12/0x2d80 mm/page_alloc.c:4554
 __alloc_pages+0x1d9/0x480 mm/page_alloc.c:5868
 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
 allocate_slab mm/slub.c:1967 [inline]
 new_slab+0x98/0x3d0 mm/slub.c:2020
 ___slab_alloc+0x6bd/0xb20 mm/slub.c:3177
 __slab_alloc+0x5e/0xa0 mm/slub.c:3263
 slab_alloc_node mm/slub.c:3348 [inline]
 __kmem_cache_alloc_node+0x203/0x2c0 mm/slub.c:3423
 __do_kmalloc_node mm/slab_common.c:937 [inline]
 __kmalloc_node_track_caller+0xa0/0x1e0 mm/slab_common.c:958
 kmalloc_reserve net/core/skbuff.c:449 [inline]
 __alloc_skb+0x236/0x4b0 net/core/skbuff.c:518
 alloc_skb include/linux/skbuff.h:1290 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1183 [inline]
 netlink_sendmsg+0x635/0xbd0 net/netlink/af_netlink.c:1848
 sock_sendmsg_nosec net/socket.c:716 [inline]
 __sock_sendmsg net/socket.c:728 [inline]
 ____sys_sendmsg+0x5cc/0x990 net/socket.c:2509
 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2563
 __sys_sendmsg net/socket.c:2592 [inline]
 __do_sys_sendmsg net/socket.c:2601 [inline]
 __se_sys_sendmsg net/socket.c:2599 [inline]
 __x64_sys_sendmsg+0x205/0x2d0 net/socket.c:2599
 x64_sys_call+0x171/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888118cccb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888118cccb80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888118cccc00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff888118cccc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888118cccd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#2] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 26948 Comm: syz.2.7236 Tainted: G    B D W          syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__rb_insert lib/rbtree.c:115 [inline]
RIP: 0010:rb_insert_color+0xa6/0x6e0 lib/rbtree.c:436
Code: 4c 8b 3b 41 f6 c7 01 0f 85 11 06 00 00 4c 89 75 b8 4c 89 65 d0 4d 8d 67 08 4d 89 e5 49 c1 ed 03 48 b8 00 00 00 00 00 fc ff df <41> 80 7c 05 00 00 74 08 4c 89 e7 e8 6a 50 c6 fc 4d 8b 34 24 49 39
RSP: 0000:ffffc900012a6ff0 EFLAGS: 00010002

RAX: dffffc0000000000 RBX: ffff888119600090 RCX: dffffc0000000000
RDX: 0000000000000010 RSI: ffff8881f7037fb0 RDI: ffff888132001810
RBP: ffffc900012a7048 R08: ffff888132001827 R09: ffff888132001818
R10: dffffc0000000000 R11: ffffed1026400305 R12: 0000000000000008
R13: 0000000000000001 R14: 1ffff110232c0012 R15: 0000000000000000
FS:  00007f379c4136c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1df780f000 CR3: 0000000116cca000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 000000000000040c DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 rb_insert_color_cached include/linux/rbtree.h:114 [inline]
 rb_add_cached include/linux/rbtree.h:183 [inline]
 __enqueue_entity kernel/sched/fair.c:639 [inline]
 put_prev_entity+0x224/0x3b0 kernel/sched/fair.c:5116
 put_prev_task_fair+0x47/0x70 kernel/sched/fair.c:8057
 put_prev_task kernel/sched/sched.h:2260 [inline]
 put_prev_task_balance+0x146/0x160 kernel/sched/core.c:6037
 __pick_next_task kernel/sched/core.c:6072 [inline]
 pick_next_task kernel/sched/core.c:6567 [inline]
 __schedule+0xc03/0x1500 kernel/sched/core.c:6712
 preempt_schedule_irq+0xaa/0x120 kernel/sched/core.c:7062
 raw_irqentry_exit_cond_resched+0x29/0x30 kernel/entry/common.c:396
 irqentry_exit+0x37/0x40 kernel/entry/common.c:439
 sysvec_apic_timer_interrupt+0x64/0xc0 arch/x86/kernel/apic/apic.c:1118
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:64
Code: c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 <f3> aa 4c 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01
RSP: 0000:ffffc900012a73b0 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 0000000003938700 RCX: 0000000000b8e300
RDX: 0000000003938700 RSI: 0000000000000000 RDI: ffff88811ba77000
RBP: ffffc900012a73d0 R08: ffff88811c6052ff R09: ffff888118cccc00
R10: dffffc0000000000 R11: ffffed1023199980 R12: 0000000000000000
R13: 0000000003938700 R14: 0000000000000000 R15: ffff888118cccc00
 ext4_xattr_set_entry+0x1a7e/0x21d0 fs/ext4/xattr.c:1700
 ext4_xattr_block_set+0xad3/0x3260 fs/ext4/xattr.c:1989
 ext4_xattr_set_handle+0xbc4/0x12c0 fs/ext4/xattr.c:2414
 ext4_xattr_set+0x242/0x320 fs/ext4/xattr.c:2516
 ext4_xattr_trusted_set+0x3c/0x50 fs/ext4/xattr_trusted.c:38
 __vfs_setxattr+0x3f2/0x440 fs/xattr.c:182
 __vfs_setxattr_noperm+0x12a/0x5e0 fs/xattr.c:216
 __vfs_setxattr_locked+0x212/0x230 fs/xattr.c:277
 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+0xc2/0xe0 fs/xattr.c:655
 x64_sys_call+0x8b7/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:190
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f379b59acb9
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:00007f379c413028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd
RAX: ffffffffffffffda RBX: 00007f379b816090 RCX: 00007f379b59acb9
RDX: 0000200000000300 RSI: 00002000000000c0 RDI: 0000200000000100
RBP: 00007f379b608bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fe37 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f379b816128 R14: 00007f379b816090 R15: 00007ffdc8013a58
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:skip_blocked_update kernel/sched/fair.c:3910 [inline]
RIP: 0010:__update_blocked_fair kernel/sched/fair.c:8862 [inline]
RIP: 0010:update_blocked_averages+0x983/0x1060 kernel/sched/fair.c:8956
Code: 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 f7 e8 54 7b 66 00 49 83 3e 00 49 89 de 75 23 49 81 c7 08 01 00 00 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 2e 7b 66 00 49 83 3f 00 74 2a 49
RSP: 0018:ffffc900001b0da0 EFLAGS: 00010006
RAX: 0000000000000021 RBX: ffff888128c89000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888118ccd880
RBP: ffffc900001b0ed8 R08: ffff888112418dc7 R09: 1ffff110224831b8
R10: dffffc0000000000 R11: ffffed10224831b9 R12: ffff888118ccd800
R13: dffffc0000000000 R14: ffff888128c89000 R15: 0000000000000108
FS:  00007f379c4136c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1df780f000 CR3: 0000000116cca000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 000000000000040c DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	4c 8b 3b             	mov    (%rbx),%r15
   3:	41 f6 c7 01          	test   $0x1,%r15b
   7:	0f 85 11 06 00 00    	jne    0x61e
   d:	4c 89 75 b8          	mov    %r14,-0x48(%rbp)
  11:	4c 89 65 d0          	mov    %r12,-0x30(%rbp)
  15:	4d 8d 67 08          	lea    0x8(%r15),%r12
  19:	4d 89 e5             	mov    %r12,%r13
  1c:	49 c1 ed 03          	shr    $0x3,%r13
  20:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  27:	fc ff df
* 2a:	41 80 7c 05 00 00    	cmpb   $0x0,0x0(%r13,%rax,1) <-- trapping instruction
  30:	74 08                	je     0x3a
  32:	4c 89 e7             	mov    %r12,%rdi
  35:	e8 6a 50 c6 fc       	call   0xfcc650a4
  3a:	4d 8b 34 24          	mov    (%r12),%r14
  3e:	49                   	rex.WB
  3f:	39                   	.byte 0x39