==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 64 at addr ffff8881121cfd10 by task syz.0.120/730

CPU: 0 PID: 730 Comm: syz.0.120 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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_02c92f715e75ceb8+0x28/0x3d
 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:10273
 __perf_event_overflow+0x437/0x620 kernel/events/core.c:9448
 perf_event_overflow kernel/events/core.c:9469 [inline]
 perf_swevent_hrtimer+0x400/0x5b0 kernel/events/core.c:10919
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x3bb/0x8e0 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:kasan_mem_to_shadow include/linux/kasan.h:59 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x5c/0x2a0 mm/kasan/generic.c:189
Code: 0f 82 09 02 00 00 49 bd 01 00 00 00 00 fc ff df 49 89 fe 49 c1 ee 03 49 ba 00 00 00 00 00 fc ff df 4f 8d 1c 16 4c 8d 44 3e ff <4d> 89 c1 49 c1 e9 03 4b 8d 1c 29 49 89 dc 4d 29 dc 49 83 fc 10 7f
RSP: 0018:ffffc90010507d60 EFLAGS: 00000a02
RAX: ffffffff81675101 RBX: 0000000000000010 RCX: ffffffff8167514f
RDX: 0000000000000001 RSI: 0000000000000010 RDI: ffffc90010507e40
RBP: ffffc90010507d88 R08: ffffc90010507e4f R09: 0000000000000000
R10: dffffc0000000000 R11: fffff520020a0fc8 R12: 0000000000000081
R13: dffffc0000000001 R14: 1ffff920020a0fc8 R15: ffffc90010507e40
 memset+0x23/0x40 mm/kasan/shadow.c:44
 __do_sys_futex kernel/futex/syscalls.c:200 [inline]
 __se_sys_futex+0xbf/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: 0033:0x7f3106b9ce59
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:00007f3107a9b0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f3106e15fa8 RCX: 00007f3106b9ce59
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f3106e15fac
RBP: 00007f3106e15fa0 R08: 002262c763a0a7ac R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3106e16038 R14: 00007ffc126f26a0 R15: 00007ffc126f2788
 </TASK>

Allocated by task 730:
 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:4988
 __do_sys_bpf kernel/bpf/syscall.c:5110 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5108 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5108
 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
 __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:6153
 netlink_rcv_skb+0x20f/0x460 net/netlink/af_netlink.c:2521
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6171
 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:2142
 __do_sys_sendto net/socket.c:2154 [inline]
 __se_sys_sendto net/socket.c:2150 [inline]
 __x64_sys_sendto+0xe5/0x100 net/socket.c:2150
 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 ffff8881121cfd00
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
 64-byte region [ffff8881121cfd00, ffff8881121cfd40)

The buggy address belongs to the physical page:
page:ffffea00044873c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1121cf
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004c74ac0 dead000000000003 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 286, tgid 286 (syz-executor), ts 25725815394, free_ts 25724937884
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2672
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2679
 get_page_from_freelist+0x2d12/0x2d80 mm/page_alloc.c:4585
 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5929
 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
 kmalloc_trace+0x29/0xb0 mm/slab_common.c:1028
 kmalloc include/linux/slab.h:563 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 tnode_alloc net/ipv4/fib_trie.c:332 [inline]
 tnode_new net/ipv4/fib_trie.c:385 [inline]
 fib_insert_node net/ipv4/fib_trie.c:1130 [inline]
 fib_insert_alias+0x381/0x10b0 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
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1580 [inline]
 free_pcp_prepare mm/page_alloc.c:1654 [inline]
 free_unref_page_prepare+0x7f8/0x800 mm/page_alloc.c:3620
 free_unref_page+0x95/0x540 mm/page_alloc.c:3718
 free_the_page mm/page_alloc.c:863 [inline]
 __free_pages+0x67/0x100 mm/page_alloc.c:6019
 __free_slab+0xca/0x1a0 mm/slub.c:2044
 free_slab mm/slub.c:2059 [inline]
 discard_slab mm/slub.c:2065 [inline]
 __unfreeze_partials+0x160/0x190 mm/slub.c:2614
 put_cpu_partial+0xa9/0x100 mm/slub.c:2690
 __slab_free+0x1c4/0x280 mm/slub.c:3589
 do_slab_free mm/slub.c:3666 [inline]
 ___cache_free+0xbf/0xd0 mm/slub.c:3722
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0xc6/0x140 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x24/0x80 mm/kasan/common.c:311
 kasan_slab_alloc include/linux/kasan.h:202 [inline]
 slab_post_alloc_hook+0x4f/0x2d0 mm/slab.h:768
 slab_alloc_node mm/slub.c:3382 [inline]
 __kmem_cache_alloc_node+0x192/0x2c0 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]
 fib_create_info+0x902/0x2030 net/ipv4/fib_semantics.c:1459
 fib_table_insert+0xb6/0x1df0 net/ipv4/fib_trie.c:1217

Memory state around the buggy address:
 ffff8881121cfc00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8881121cfc80: 00 00 00 00 00 00 00 03 fc fc fc fc fc fc fc fc
>ffff8881121cfd00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
                                  ^
 ffff8881121cfd80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8881121cfe00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
   0:	0f 82 09 02 00 00    	jb     0x20f
   6:	49 bd 01 00 00 00 00 	movabs $0xdffffc0000000001,%r13
   d:	fc ff df
  10:	49 89 fe             	mov    %rdi,%r14
  13:	49 c1 ee 03          	shr    $0x3,%r14
  17:	49 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%r10
  1e:	fc ff df
  21:	4f 8d 1c 16          	lea    (%r14,%r10,1),%r11
  25:	4c 8d 44 3e ff       	lea    -0x1(%rsi,%rdi,1),%r8
* 2a:	4d 89 c1             	mov    %r8,%r9 <-- trapping instruction
  2d:	49 c1 e9 03          	shr    $0x3,%r9
  31:	4b 8d 1c 29          	lea    (%r9,%r13,1),%rbx
  35:	49 89 dc             	mov    %rbx,%r12
  38:	4d 29 dc             	sub    %r11,%r12
  3b:	49 83 fc 10          	cmp    $0x10,%r12
  3f:	7f                   	.byte 0x7f