==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6bf/0x900 kernel/bpf/stackmap.c:271
Write of size 104 at addr ffff88801cf8a390 by task syz.3.4430/20172

CPU: 1 PID: 20172 Comm: syz.3.4430 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Call Trace:
 <IRQ>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xa8/0x210 mm/kasan/report.c:468
 kasan_report+0x117/0x150 mm/kasan/report.c:581
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x241/0x290 mm/kasan/generic.c:187
 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106
 __bpf_get_stackid+0x6bf/0x900 kernel/bpf/stackmap.c:271
 ____bpf_get_stackid_pe kernel/bpf/stackmap.c:362 [inline]
 bpf_get_stackid_pe+0x343/0x410 kernel/bpf/stackmap.c:331
 bpf_prog_888c70248be4b0cb+0x30/0x40
 bpf_dispatcher_nop_func include/linux/bpf.h:1224 [inline]
 __bpf_prog_run include/linux/filter.h:616 [inline]
 bpf_prog_run include/linux/filter.h:623 [inline]
 bpf_overflow_handler+0x1fc/0x510 kernel/events/core.c:10547
 __perf_event_overflow+0x447/0x630 kernel/events/core.c:9718
 perf_swevent_hrtimer+0x4aa/0x570 kernel/events/core.c:11188
 __run_hrtimer kernel/time/hrtimer.c:1750 [inline]
 __hrtimer_run_queues+0x4eb/0xc40 kernel/time/hrtimer.c:1814
 hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1876
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
 __sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:finish_task_switch+0x26a/0x8f0 kernel/sched/core.c:5255
Code: 0f 84 33 01 00 00 48 85 db 0f 85 52 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 f0 93 30 09 e8 7b 23 30 00 fb 4c 8b 65 c0 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc900047af7d8 EFLAGS: 00000286
RAX: 50371ccf88a15800 RBX: 0000000000000000 RCX: 50371ccf88a15800
RDX: dffffc0000000000 RSI: ffffffff8acac900 RDI: ffffffff8b1c81e0
RBP: ffffc900047af830 R08: ffffffff8e8add2f R09: 1ffffffff1d15ba5
R10: dffffc0000000000 R11: fffffbfff1d15ba6 R12: ffff88807cb90000
R13: dffffc0000000000 R14: ffff888057a13c00 R15: ffff8880b8f3cac8
 context_switch kernel/sched/core.c:5384 [inline]
 __schedule+0x155b/0x45a0 kernel/sched/core.c:6700
 preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6867
 preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6891
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
 class_preempt_destructor include/linux/preempt.h:478 [inline]
 try_to_wake_up+0x781/0x1190 kernel/sched/core.c:4356
 wake_up_process kernel/sched/core.c:4481 [inline]
 wake_up_q+0xb6/0x100 kernel/sched/core.c:1032
 futex_wake+0x42a/0x4f0 kernel/futex/waitwake.c:184
 do_futex+0x35d/0x3e0 kernel/futex/syscalls.c:139
 __do_sys_futex kernel/futex/syscalls.c:211 [inline]
 __se_sys_futex+0x3a9/0x440 kernel/futex/syscalls.c:192
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3b4619aeb9
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:00007f3b470f40e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f3b46415fa8 RCX: 00007f3b4619aeb9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f3b46415fac
RBP: 00007f3b46415fa0 R08: 0000000000745d1e R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3b46416038 R14: 00007ffcab221550 R15: 00007ffcab221638
 </TASK>

Allocated by task 20172:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 ____kasan_kmalloc mm/kasan/common.c:375 [inline]
 __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384
 kasan_kmalloc include/linux/kasan.h:198 [inline]
 __do_kmalloc_node mm/slab_common.c:1007 [inline]
 __kmalloc_node+0xb4/0x230 mm/slab_common.c:1014
 kmalloc_node include/linux/slab.h:620 [inline]
 __bpf_map_area_alloc kernel/bpf/syscall.c:303 [inline]
 bpf_map_area_alloc+0x5e/0x110 kernel/bpf/syscall.c:316
 prealloc_elems_and_freelist+0x86/0x1c0 kernel/bpf/stackmap.c:51
 stack_map_alloc+0x33a/0x4c0 kernel/bpf/stackmap.c:114
 map_create+0x877/0x12f0 kernel/bpf/syscall.c:1247
 __sys_bpf+0x651/0x890 kernel/bpf/syscall.c:5458
 __do_sys_bpf kernel/bpf/syscall.c:5580 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5578 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5578
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Last potentially related work creation:
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:46
 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492
 __call_rcu_common kernel/rcu/tree.c:2721 [inline]
 call_rcu+0x153/0x950 kernel/rcu/tree.c:2837
 nf_hook_entries_free net/netfilter/core.c:88 [inline]
 __nf_register_net_hook+0x788/0x910 net/netfilter/core.c:457
 nf_register_net_hook+0xb2/0x190 net/netfilter/core.c:578
 nf_register_net_hooks+0x44/0x1b0 net/netfilter/core.c:594
 nf_ct_netns_do_get+0x3c0/0x5c0 net/netfilter/nf_conntrack_proto.c:457
 nf_ct_netns_inet_get+0x1f/0x150 net/netfilter/nf_conntrack_proto.c:566
 nf_conncount_init+0x127/0x380 net/netfilter/nf_conncount.c:614
 ovs_ct_limit_init net/openvswitch/conntrack.c:1580 [inline]
 ovs_ct_init+0x316/0x490 net/openvswitch/conntrack.c:1989
 ovs_init_net+0x1e6/0x250 net/openvswitch/datapath.c:2644
 ops_init+0x397/0x640 net/core/net_namespace.c:139
 setup_net+0x3b6/0xa30 net/core/net_namespace.c:343
 copy_net_ns+0x36d/0x5e0 net/core/net_namespace.c:520
 create_new_namespaces+0x3d3/0x6f0 kernel/nsproxy.c:110
 copy_namespaces+0x430/0x4a0 kernel/nsproxy.c:179
 copy_process+0x1724/0x3d80 kernel/fork.c:2509
 kernel_clone+0x24b/0x8a0 kernel/fork.c:2914
 __do_sys_clone kernel/fork.c:3057 [inline]
 __se_sys_clone kernel/fork.c:3041 [inline]
 __x64_sys_clone+0x1b7/0x230 kernel/fork.c:3041
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Second to last potentially related work creation:
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:46
 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492
 __call_rcu_common kernel/rcu/tree.c:2721 [inline]
 call_rcu+0x153/0x950 kernel/rcu/tree.c:2837
 nf_hook_entries_free net/netfilter/core.c:88 [inline]
 __nf_register_net_hook+0x788/0x910 net/netfilter/core.c:457
 nf_register_net_hook+0xb2/0x190 net/netfilter/core.c:578
 nf_register_net_hooks+0x44/0x1b0 net/netfilter/core.c:594
 ip6t_register_table+0x543/0x7e0 net/ipv6/netfilter/ip6_tables.c:1787
 ip6table_mangle_table_init+0x41/0x60 net/ipv6/netfilter/ip6table_mangle.c:84
 xt_find_table_lock+0x306/0x3e0 net/netfilter/x_tables.c:1259
 xt_request_find_table_lock+0x26/0x100 net/netfilter/x_tables.c:1284
 get_info net/ipv6/netfilter/ip6_tables.c:979 [inline]
 do_ip6t_get_ctl+0x717/0x1210 net/ipv6/netfilter/ip6_tables.c:1668
 nf_getsockopt+0x262/0x280 net/netfilter/nf_sockopt.c:116
 ipv6_getsockopt+0x226/0x2e0 net/ipv6/ipv6_sockglue.c:1499
 do_sock_getsockopt+0x379/0x450 net/socket.c:2383
 __sys_getsockopt net/socket.c:2412 [inline]
 __do_sys_getsockopt net/socket.c:2422 [inline]
 __se_sys_getsockopt net/socket.c:2419 [inline]
 __x64_sys_getsockopt+0x1d6/0x280 net/socket.c:2419
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff88801cf8a380
 which belongs to the cache kmalloc-cg-64 of size 64
The buggy address is located 16 bytes inside of
 allocated 40-byte region [ffff88801cf8a380, ffff88801cf8a3a8)

The buggy address belongs to the physical page:
page:ffffea000073e280 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1cf8a
memcg:ffff88802ffbd201
anon flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff888017c4da00 ffffea00006bd680 dead000000000005
raw: 0000000000000000 0000000080200020 00000001ffffffff ffff88802ffbd201
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 5769, tgid 5769 (syz-executor), ts 92001143667, free_ts 92000669336
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1581
 prep_new_page mm/page_alloc.c:1588 [inline]
 get_page_from_freelist+0x1951/0x19e0 mm/page_alloc.c:3220
 __alloc_pages+0x1f0/0x460 mm/page_alloc.c:4486
 alloc_slab_page+0x5d/0x160 mm/slub.c:1881
 allocate_slab mm/slub.c:2028 [inline]
 new_slab+0x87/0x2d0 mm/slub.c:2081
 ___slab_alloc+0xc5d/0x12f0 mm/slub.c:3253
 __slab_alloc mm/slub.c:3339 [inline]
 __slab_alloc_node mm/slub.c:3392 [inline]
 slab_alloc_node mm/slub.c:3485 [inline]
 __kmem_cache_alloc_node+0x19e/0x250 mm/slub.c:3534
 kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098
 kmalloc include/linux/slab.h:600 [inline]
 alloc_fdtable+0xca/0x2c0 fs/file.c:147
 dup_fd+0x786/0xa50 fs/file.c:346
 copy_files+0xc3/0x120 kernel/fork.c:1794
 copy_process+0x15ab/0x3d80 kernel/fork.c:2494
 kernel_clone+0x24b/0x8a0 kernel/fork.c:2914
 __do_sys_clone kernel/fork.c:3057 [inline]
 __se_sys_clone kernel/fork.c:3041 [inline]
 __x64_sys_clone+0x1b7/0x230 kernel/fork.c:3041
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1181 [inline]
 free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365
 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458
 vfree+0x1a6/0x320 mm/vmalloc.c:2868
 __do_replace+0x858/0x990 net/ipv6/netfilter/ip6_tables.c:1107
 do_replace net/ipv6/netfilter/ip6_tables.c:1158 [inline]
 do_ip6t_set_ctl+0xb48/0xe10 net/ipv6/netfilter/ip6_tables.c:1644
 nf_setsockopt+0x263/0x280 net/netfilter/nf_sockopt.c:101
 do_sock_setsockopt+0x175/0x1a0 net/socket.c:2321
 __sys_setsockopt net/socket.c:2344 [inline]
 __do_sys_setsockopt net/socket.c:2353 [inline]
 __se_sys_setsockopt net/socket.c:2350 [inline]
 __x64_sys_setsockopt+0x182/0x200 net/socket.c:2350
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Memory state around the buggy address:
 ffff88801cf8a280: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88801cf8a300: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff88801cf8a380: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
                                  ^
 ffff88801cf8a400: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88801cf8a480: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
   0:	0f 84 33 01 00 00    	je     0x139
   6:	48 85 db             	test   %rbx,%rbx
   9:	0f 85 52 01 00 00    	jne    0x161
   f:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  14:	4c 8b 75 d0          	mov    -0x30(%rbp),%r14
  18:	4c 89 e7             	mov    %r12,%rdi
  1b:	e8 f0 93 30 09       	call   0x9309410
  20:	e8 7b 23 30 00       	call   0x3023a0
  25:	fb                   	sti
  26:	4c 8b 65 c0          	mov    -0x40(%rbp),%r12
* 2a:	49 8d bc 24 f8 15 00 	lea    0x15f8(%r12),%rdi <-- trapping instruction
  31:	00
  32:	48 89 f8             	mov    %rdi,%rax
  35:	48 c1 e8 03          	shr    $0x3,%rax
  39:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax
  3e:	84 c0                	test   %al,%al