==================================================================
BUG: KASAN: slab-use-after-free in macvlan_forward_source+0x512/0x630 drivers/net/macvlan.c:436
Read of size 2 at addr ffff888058190dfc by task udevd/5197

CPU: 1 UID: 0 PID: 5197 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <IRQ>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 macvlan_forward_source+0x512/0x630 drivers/net/macvlan.c:436
 macvlan_handle_frame+0x2e2/0x12e0 drivers/net/macvlan.c:471
 __netif_receive_skb_core+0x96f/0x3060 net/core/dev.c:6016
 __netif_receive_skb_one_core net/core/dev.c:6127 [inline]
 __netif_receive_skb+0x72/0x380 net/core/dev.c:6242
 netif_receive_skb_internal net/core/dev.c:6328 [inline]
 netif_receive_skb+0x1cb/0x790 net/core/dev.c:6387
 NF_HOOK+0xa0/0x390 include/linux/netfilter.h:319
 br_handle_frame_finish+0x15c6/0x1c50 net/bridge/br_input.c:235
 br_nf_hook_thresh+0x3c6/0x4a0 net/bridge/br_netfilter_hooks.c:-1
 br_nf_pre_routing_finish_ipv6+0x999/0xd60 net/bridge/br_netfilter_ipv6.c:-1
 NF_HOOK include/linux/netfilter.h:318 [inline]
 br_nf_pre_routing_ipv6+0x37e/0x6b0 net/bridge/br_netfilter_ipv6.c:184
 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:291 [inline]
 br_handle_frame+0x982/0x14c0 net/bridge/br_input.c:442
 __netif_receive_skb_core+0x96f/0x3060 net/core/dev.c:6016
 __netif_receive_skb_one_core net/core/dev.c:6127 [inline]
 __netif_receive_skb+0x72/0x380 net/core/dev.c:6242
 process_backlog+0x622/0x1530 net/core/dev.c:6594
 __napi_poll+0xae/0x320 net/core/dev.c:7657
 napi_poll net/core/dev.c:7720 [inline]
 net_rx_action+0x672/0xe50 net/core/dev.c:7872
 handle_softirqs+0x286/0x870 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:36 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:139 [inline]
RIP: 0010:wrmsrq arch/x86/include/asm/msr.h:199 [inline]
RIP: 0010:native_apic_msr_write+0x39/0x50 arch/x86/include/asm/apic.h:212
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 e9 d0 30 d7 09 cc f3 0f 1e fa 89 f6 31 d2 e9 b2 8e 50 03 66
RSP: 0018:ffffc900030b74a8 EFLAGS: 00000246
RAX: 00000000000000f6 RBX: 0000000000000200 RCX: 000000000000083f
RDX: 0000000000000000 RSI: 00000000000000f6 RDI: 000000000000083f
RBP: ffffc900030b7580 R08: ffffc900030b7507 R09: 1ffff92000616ea0
R10: dffffc0000000000 R11: fffff52000616ea1 R12: ffff8880b8931401
R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880b89314f0
 __apic_send_IPI_self arch/x86/include/asm/apic.h:459 [inline]
 arch_irq_work_raise+0x6d/0x80 arch/x86/kernel/irq_work.c:31
 irq_work_raise kernel/irq_work.c:84 [inline]
 __irq_work_queue_local+0x1d7/0x550 kernel/irq_work.c:112
 irq_work_queue+0x99/0x140 kernel/irq_work.c:124
 bpf_send_signal_common+0x3b4/0x540 kernel/trace/bpf_trace.c:871
 ____bpf_send_signal kernel/trace/bpf_trace.c:880 [inline]
 bpf_send_signal+0x1d/0x30 kernel/trace/bpf_trace.c:878
 bpf_prog_8ecd41c4ac539703+0x25/0x4c
 bpf_dispatcher_nop_func include/linux/bpf.h:1350 [inline]
 __bpf_prog_run include/linux/filter.h:721 [inline]
 bpf_prog_run include/linux/filter.h:728 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2075 [inline]
 bpf_trace_run2+0x284/0x4b0 kernel/trace/bpf_trace.c:2116
 __bpf_trace_contention_end+0xdc/0x130 include/trace/events/lock.h:122
 __do_trace_contention_end include/trace/events/lock.h:122 [inline]
 trace_contention_end+0xf4/0x120 include/trace/events/lock.h:122
 __mutex_lock_common kernel/locking/mutex.c:607 [inline]
 __mutex_lock+0x32b/0x1350 kernel/locking/mutex.c:760
 ep_send_events fs/eventpoll.c:1781 [inline]
 ep_try_send_events+0x197/0xf40 fs/eventpoll.c:1905
 ep_poll fs/eventpoll.c:1970 [inline]
 do_epoll_wait+0x53f/0xf30 fs/eventpoll.c:2473
 __do_sys_epoll_wait fs/eventpoll.c:2481 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2476 [inline]
 __x64_sys_epoll_wait+0x1be/0x210 fs/eventpoll.c:2476
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3cd34a7407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007fff8cbae6e0 EFLAGS: 00000202 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 00007f3cd3b88880 RCX: 00007f3cd34a7407
RDX: 0000000000000008 RSI: 00007fff8cbae840 RDI: 000000000000000b
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000bb8 R11: 0000000000000202 R12: 0000000000000001
R13: 0000556e733e3100 R14: 0000556e733c8008 R15: 0000000000000000
 </TASK>

Allocated by task 7764:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 poison_kmalloc_redzone mm/kasan/common.c:400 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:417
 kasan_kmalloc include/linux/kasan.h:262 [inline]
 __do_kmalloc_node mm/slub.c:5642 [inline]
 __kvmalloc_node_noprof+0x5cd/0x910 mm/slub.c:7100
 alloc_netdev_mqs+0xa6/0x11b0 net/core/dev.c:11988
 rtnl_create_link+0x31f/0xd10 net/core/rtnetlink.c:3648
 rtnl_newlink_create+0x25c/0xb00 net/core/rtnetlink.c:3830
 __rtnl_newlink net/core/rtnetlink.c:3957 [inline]
 rtnl_newlink+0x16e4/0x1c80 net/core/rtnetlink.c:4072
 rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6958
 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:742
 ____sys_sendmsg+0x505/0x830 net/socket.c:2630
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2684
 __sys_sendmsg net/socket.c:2716 [inline]
 __do_sys_sendmsg net/socket.c:2721 [inline]
 __se_sys_sendmsg net/socket.c:2719 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2719
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 7764:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 __kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587
 kasan_save_free_info mm/kasan/kasan.h:406 [inline]
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2539 [inline]
 slab_free mm/slub.c:6630 [inline]
 kfree+0x19a/0x6d0 mm/slub.c:6837
 rtnl_newlink_create+0x373/0xb00 net/core/rtnetlink.c:3844
 __rtnl_newlink net/core/rtnetlink.c:3957 [inline]
 rtnl_newlink+0x16e4/0x1c80 net/core/rtnetlink.c:4072
 rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6958
 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:742
 ____sys_sendmsg+0x505/0x830 net/socket.c:2630
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2684
 __sys_sendmsg net/socket.c:2716 [inline]
 __do_sys_sendmsg net/socket.c:2721 [inline]
 __se_sys_sendmsg net/socket.c:2719 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2719
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888058190000
 which belongs to the cache kmalloc-cg-4k of size 4096
The buggy address is located 3580 bytes inside of
 freed 4096-byte region [ffff888058190000, ffff888058191000)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888058196000 pfn:0x58190
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888079e1ad01
flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000240 ffff88801a030500 ffffea000076b210 ffffea0001fe6a10
raw: ffff888058196000 0000000000040001 00000000f5000000 ffff888079e1ad01
head: 00fff00000000240 ffff88801a030500 ffffea000076b210 ffffea0001fe6a10
head: ffff888058196000 0000000000040001 00000000f5000000 ffff888079e1ad01
head: 00fff00000000003 ffffea0001606401 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5828, tgid 5828 (udevd), ts 136564165273, free_ts 136508893224
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850
 prep_new_page mm/page_alloc.c:1858 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3884
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5183
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
 alloc_slab_page mm/slub.c:3055 [inline]
 allocate_slab+0x96/0x350 mm/slub.c:3228
 new_slab mm/slub.c:3282 [inline]
 ___slab_alloc+0xe94/0x18a0 mm/slub.c:4651
 __slab_alloc+0x65/0x100 mm/slub.c:4770
 __slab_alloc_node mm/slub.c:4846 [inline]
 slab_alloc_node mm/slub.c:5268 [inline]
 __do_kmalloc_node mm/slub.c:5641 [inline]
 __kvmalloc_node_noprof+0x6ba/0x910 mm/slub.c:7100
 seq_buf_alloc fs/seq_file.c:38 [inline]
 seq_read_iter+0x202/0xe20 fs/seq_file.c:210
 new_sync_read fs/read_write.c:491 [inline]
 vfs_read+0x55a/0xa30 fs/read_write.c:572
 ksys_read+0x145/0x250 fs/read_write.c:715
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5828 tgid 5828 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2906
 discard_slab mm/slub.c:3326 [inline]
 __put_partials+0x146/0x170 mm/slub.c:3872
 put_cpu_partial+0x1f2/0x2e0 mm/slub.c:3947
 __slab_free+0x2b9/0x390 mm/slub.c:5921
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:352
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4970 [inline]
 slab_alloc_node mm/slub.c:5280 [inline]
 __do_kmalloc_node mm/slub.c:5641 [inline]
 __kmalloc_noprof+0x3c3/0x7f0 mm/slub.c:5654
 kmalloc_noprof include/linux/slab.h:961 [inline]
 tomoyo_realpath_from_path+0xe3/0x5d0 security/tomoyo/realpath.c:251
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_perm+0x213/0x4b0 security/tomoyo/file.c:822
 security_inode_getattr+0x12f/0x330 security/security.c:2416
 vfs_getattr fs/stat.c:259 [inline]
 vfs_statx_path fs/stat.c:299 [inline]
 vfs_statx+0x18e/0x550 fs/stat.c:356
 vfs_fstatat+0x118/0x170 fs/stat.c:375
 __do_sys_newfstatat fs/stat.c:542 [inline]
 __se_sys_newfstatat fs/stat.c:536 [inline]
 __x64_sys_newfstatat+0x116/0x190 fs/stat.c:536
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888058190c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888058190d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888058190d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                                ^
 ffff888058190e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888058190e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	74 2a                	je     0x2c
   2:	83 ff 30             	cmp    $0x30,%edi
   5:	74 25                	je     0x2c
   7:	eb 10                	jmp    0x19
   9:	81 ff d0 00 00 00    	cmp    $0xd0,%edi
   f:	74 1b                	je     0x2c
  11:	81 ff e0 00 00 00    	cmp    $0xe0,%edi
  17:	74 13                	je     0x2c
  19:	c1 ef 04             	shr    $0x4,%edi
  1c:	81 c7 00 08 00 00    	add    $0x800,%edi
  22:	89 f9                	mov    %edi,%ecx
  24:	89 f0                	mov    %esi,%eax
  26:	31 d2                	xor    %edx,%edx
  28:	0f 30                	wrmsr
* 2a:	66 90                	xchg   %ax,%ax <-- trapping instruction
  2c:	e9 d0 30 d7 09       	jmp    0x9d73101
  31:	cc                   	int3
  32:	f3 0f 1e fa          	endbr64
  36:	89 f6                	mov    %esi,%esi
  38:	31 d2                	xor    %edx,%edx
  3a:	e9 b2 8e 50 03       	jmp    0x3508ef1
  3f:	66                   	data16