==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 56 at addr ffff888132d5a390 by task syz.4.561/2327

CPU: 0 PID: 2327 Comm: syz.4.561 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Call Trace:
 <IRQ>
 __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
 memcpy+0x44/0x70 mm/kasan/shadow.c:66
 __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
 ____bpf_get_stackid_pe kernel/bpf/stackmap.c:365 [inline]
 bpf_get_stackid_pe+0x2ee/0x400 kernel/bpf/stackmap.c:334
 bpf_prog_a448e89f4c9ad9d1+0x28/0x42
 bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline]
 __bpf_prog_run include/linux/filter.h:607 [inline]
 bpf_prog_run include/linux/filter.h:614 [inline]
 bpf_overflow_handler+0x3d0/0x5e0 kernel/events/core.c:10238
 __perf_event_overflow+0x437/0x620 kernel/events/core.c:9448
 perf_swevent_hrtimer+0x400/0x5b0 kernel/events/core.c:10879
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x3d5/0xa00 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3c7/0x8c0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x11e/0x440 arch/x86/kernel/apic/apic.c:1124
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__sanitizer_cov_trace_pc+0x54/0x60 kernel/kcov.c:230
Code: 0b 00 00 00 74 2c 8b 91 48 0b 00 00 83 fa 02 75 21 48 8b 91 50 0b 00 00 48 8b 32 48 8d 7e 01 8b 89 4c 0b 00 00 48 39 cf 73 08 <48> 89 3a 48 89 44 f2 08 5d c3 66 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9001022fdb0 EFLAGS: 00000287
RAX: ffffffff816742f8 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc900021fd000 RSI: 0000000000000035 RDI: 0000000000000036
RBP: ffffc9001022fdb0 R08: ffffc9001022fe4f R09: ffffc9001022fe40
R10: dffffc0000000000 R11: fffff52002045fca R12: 0000000000000081
R13: 1ffff92002045fc0 R14: 0000000000000000 R15: ffffc9001022fe40
 __do_sys_futex kernel/futex/syscalls.c:202 [inline]
 __se_sys_futex+0x108/0x310 kernel/futex/syscalls.c:194
 __x64_sys_futex+0xe5/0x100 kernel/futex/syscalls.c:194
 x64_sys_call+0x7ec/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:203
 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: 0033:0x7f725bf9af79
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:00007f725cdea0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f725c216098 RCX: 00007f725bf9af79
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f725c21609c
RBP: 00007f725c216090 R08: 00009ae8bf0d9168 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f725c216128 R14: 00007fffc5d40fd0 R15: 00007fffc5d410b8
 </TASK>

Allocated by task 2318:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_alloc_info+0x25/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:380 [inline]
 __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389
 kasan_kmalloc include/linux/kasan.h:212 [inline]
 __do_kmalloc_node mm/slab_common.c:938 [inline]
 __kmalloc_node+0xb2/0x1e0 mm/slab_common.c:945
 kmalloc_node include/linux/slab.h:589 [inline]
 __bpf_map_area_alloc kernel/bpf/syscall.c:328 [inline]
 bpf_map_area_alloc+0x4b/0xe0 kernel/bpf/syscall.c:341
 prealloc_elems_and_freelist+0x8a/0x1e0 kernel/bpf/stackmap.c:51
 stack_map_alloc+0x3a7/0x530 kernel/bpf/stackmap.c:117
 find_and_alloc_map kernel/bpf/syscall.c:133 [inline]
 map_create+0x49c/0xd80 kernel/bpf/syscall.c:1126
 __sys_bpf+0x34e/0x850 kernel/bpf/syscall.c:4987
 __do_sys_bpf kernel/bpf/syscall.c:5109 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5107 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5107
 x64_sys_call+0x488/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322
 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+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
 ip6addrlbl_net_exit+0x17e/0x1a0 net/ipv6/addrlabel.c:347
 ops_exit_list net/core/net_namespace.c:172 [inline]
 cleanup_net+0x5b5/0xb10 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

Second to last potentially related work creation:
 kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46
 __kasan_record_aux_stack+0xb6/0xc0 mm/kasan/generic.c:486
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496
 __call_rcu_common kernel/rcu/tree.c:2807 [inline]
 call_rcu+0xcf/0xf90 kernel/rcu/tree.c:2926
 collapse net/ipv4/fib_trie.c:703 [inline]
 resize+0x19f2/0x1c90 net/ipv4/fib_trie.c:906
 replace+0x368/0x4c0 net/ipv4/fib_trie.c:530
 inflate net/ipv4/fib_trie.c:624 [inline]
 resize+0xb18/0x1c90 net/ipv4/fib_trie.c:869
 trie_rebalance net/ipv4/fib_trie.c:1106 [inline]
 fib_insert_node net/ipv4/fib_trie.c:1150 [inline]
 fib_insert_alias+0xa1f/0x10b0 net/ipv4/fib_trie.c:1164
 fib_table_insert+0x81d/0x1df0 net/ipv4/fib_trie.c:1359
 fib_magic net/ipv4/fib_frontend.c:1118 [inline]
 fib_add_ifaddr+0x384/0xf10 net/ipv4/fib_frontend.c:1140
 fib_inetaddr_event+0x15d/0x310 net/ipv4/fib_frontend.c:1454
 notifier_call_chain kernel/notifier.c:87 [inline]
 blocking_notifier_call_chain+0xcb/0x150 kernel/notifier.c:382
 __inet_insert_ifa+0x856/0xa30 net/ipv4/devinet.c:568
 inet_rtm_newaddr+0x8c0/0x1650 net/ipv4/devinet.c:970
 rtnetlink_rcv_msg+0xb3b/0xe00 net/core/rtnetlink.c:6150
 netlink_rcv_skb+0x20f/0x460 net/netlink/af_netlink.c:2521
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6168
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x8ab/0xa30 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x8b9/0xbd0 net/netlink/af_netlink.c:1873
 sock_sendmsg_nosec net/socket.c:716 [inline]
 __sock_sendmsg net/socket.c:728 [inline]
 __sys_sendto+0x4ac/0x660 net/socket.c:2143
 __do_sys_sendto net/socket.c:2155 [inline]
 __se_sys_sendto net/socket.c:2151 [inline]
 __x64_sys_sendto+0xe5/0x100 net/socket.c:2151
 x64_sys_call+0x83/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:45
 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

The buggy address belongs to the object at ffff888132d5a380
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
 64-byte region [ffff888132d5a380, ffff888132d5a3c0)

The buggy address belongs to the physical page:
page:ffffea0004cb5680 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x132d5a
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004caa140 dead000000000002 ffff888100042780
raw: 0000000000000000 0000000000200020 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 283, tgid 283 (syz-executor), ts 22931956068, 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+0xa1/0x1e0 mm/slab_common.c:951
 kmalloc include/linux/slab.h:568 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 tnode_alloc net/ipv4/fib_trie.c:332 [inline]
 tnode_new+0xc8/0x320 net/ipv4/fib_trie.c:385
 inflate net/ipv4/fib_trie.c:596 [inline]
 resize+0x649/0x1c90 net/ipv4/fib_trie.c:869
 trie_rebalance net/ipv4/fib_trie.c:1106 [inline]
 fib_insert_node net/ipv4/fib_trie.c:1150 [inline]
 fib_insert_alias+0xa1f/0x10b0 net/ipv4/fib_trie.c:1164
 fib_table_insert+0x81d/0x1df0 net/ipv4/fib_trie.c:1359
 fib_magic net/ipv4/fib_frontend.c:1118 [inline]
 fib_add_ifaddr+0x384/0xf10 net/ipv4/fib_frontend.c:1140
 fib_inetaddr_event+0x15d/0x310 net/ipv4/fib_frontend.c:1454
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888132d5a280: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888132d5a300: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888132d5a380: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
                                  ^
 ffff888132d5a400: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888132d5a480: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
   0:	0b 00                	or     (%rax),%eax
   2:	00 00                	add    %al,(%rax)
   4:	74 2c                	je     0x32
   6:	8b 91 48 0b 00 00    	mov    0xb48(%rcx),%edx
   c:	83 fa 02             	cmp    $0x2,%edx
   f:	75 21                	jne    0x32
  11:	48 8b 91 50 0b 00 00 	mov    0xb50(%rcx),%rdx
  18:	48 8b 32             	mov    (%rdx),%rsi
  1b:	48 8d 7e 01          	lea    0x1(%rsi),%rdi
  1f:	8b 89 4c 0b 00 00    	mov    0xb4c(%rcx),%ecx
  25:	48 39 cf             	cmp    %rcx,%rdi
  28:	73 08                	jae    0x32
* 2a:	48 89 3a             	mov    %rdi,(%rdx) <-- trapping instruction
  2d:	48 89 44 f2 08       	mov    %rax,0x8(%rdx,%rsi,8)
  32:	5d                   	pop    %rbp
  33:	c3                   	ret
  34:	66 90                	xchg   %ax,%ax
  36:	90                   	nop
  37:	90                   	nop
  38:	90                   	nop
  39:	90                   	nop
  3a:	90                   	nop
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop