==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6c9/0x920 kernel/bpf/stackmap.c:274
Write of size 32 at addr ffff88801bfcff10 by task syz.2.1255/8728
CPU: 1 PID: 8728 Comm: syz.2.1255 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
print_address_description mm/kasan/report.c:316 [inline]
print_report+0xa8/0x210 mm/kasan/report.c:420
kasan_report+0x10b/0x140 mm/kasan/report.c:524
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x235/0x290 mm/kasan/generic.c:189
memcpy+0x3c/0x60 mm/kasan/shadow.c:66
__bpf_get_stackid+0x6c9/0x920 kernel/bpf/stackmap.c:274
____bpf_get_stackid_pe kernel/bpf/stackmap.c:365 [inline]
bpf_get_stackid_pe+0x33f/0x400 kernel/bpf/stackmap.c:334
bpf_prog_7057c48c9267d717+0x21/0x36
bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline]
__bpf_prog_run include/linux/filter.h:607 [inline]
bpf_prog_run include/linux/filter.h:614 [inline]
bpf_overflow_handler+0x50b/0x790 kernel/events/core.c:10321
__perf_event_overflow+0x457/0x630 kernel/events/core.c:9496
perf_event_overflow kernel/events/core.c:9517 [inline]
perf_swevent_hrtimer+0x472/0x630 kernel/events/core.c:10967
__run_hrtimer kernel/time/hrtimer.c:1751 [inline]
__hrtimer_run_queues+0x4e7/0xc90 kernel/time/hrtimer.c:1815
hrtimer_interrupt+0x399/0x980 kernel/time/hrtimer.c:1877
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
__sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__syscall_enter_from_user_work kernel/entry/common.c:97 [inline]
RIP: 0010:syscall_enter_from_user_mode+0x2a/0x80 kernel/entry/common.c:118
Code: 41 56 53 48 89 f3 49 89 fe 48 8b 7c 24 10 e8 ed fa ff ff 66 90 66 90 e8 a4 a8 5d f7 e8 1f a7 5d f7 fb 65 48 8b 05 86 8e d7 75 <48> 8b 70 08 40 f6 c6 3f 74 0b 4c 89 f7 5b 41 5e e9 a1 08 44 f7 48
RSP: 0018:ffffc9001b5bff08 EFLAGS: 00000286
RAX: ffff88802d128000 RBX: 00000000000000ca RCX: aeeda20e3ae09900
RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: ffffffff8adee1a0
RBP: ffffc9001b5bff48 R08: ffffffff8e200f6f R09: 1ffffffff1c401ed
R10: dffffc0000000000 R11: fffffbfff1c401ee R12: 0000000000000000
R13: 0000000000000000 R14: ffffc9001b5bff58 R15: 0000000000000000
do_syscall_64+0x24/0xa0 arch/x86/entry/common.c:72
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f97cbf9ce59
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:00007f97cce280e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f97cc215fa8 RCX: 00007f97cbf9ce59
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f97cc215fac
RBP: 00007f97cc215fa0 R08: 0019ee8c36b8bb10 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f97cc216038 R14: 00007ffe4f0f5300 R15: 00007ffe4f0f53e8
Allocated by task 8728:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
____kasan_kmalloc mm/kasan/common.c:375 [inline]
__kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slab_common.c:936 [inline]
__kmalloc_node+0xb2/0x240 mm/slab_common.c:943
kmalloc_node include/linux/slab.h:589 [inline]
__bpf_map_area_alloc kernel/bpf/syscall.c:328 [inline]
bpf_map_area_alloc+0x47/0xe0 kernel/bpf/syscall.c:341
prealloc_elems_and_freelist+0x86/0x1c0 kernel/bpf/stackmap.c:51
stack_map_alloc+0x386/0x510 kernel/bpf/stackmap.c:117
find_and_alloc_map kernel/bpf/syscall.c:133 [inline]
map_create+0x524/0xff0 kernel/bpf/syscall.c:1149
__sys_bpf+0x38b/0x780 kernel/bpf/syscall.c:5013
__do_sys_bpf kernel/bpf/syscall.c:5135 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5133 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5133
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+0xb2/0xc0 mm/kasan/generic.c:486
call_rcu+0x14f/0x950 kernel/rcu/tree.c:2849
nf_unregister_net_hook net/netfilter/core.c:-1 [inline]
nf_unregister_net_hooks+0xc7/0x130 net/netfilter/core.c:601
nf_defrag_ipv6_disable+0x91/0xe0 net/ipv6/netfilter/nf_defrag_ipv6_hooks.c:163
nf_ct_netns_do_put net/netfilter/nf_conntrack_proto.c:570 [inline]
nf_ct_netns_put+0x371/0x510 net/netfilter/nf_conntrack_proto.c:-1
nf_conncount_destroy+0x3d/0x150 net/netfilter/nf_conncount.c:688
ovs_ct_limit_exit net/openvswitch/conntrack.c:1919 [inline]
ovs_ct_exit+0x98/0x200 net/openvswitch/conntrack.c:2322
ovs_exit_net+0xe9/0x7a0 net/openvswitch/datapath.c:2687
ops_exit_list net/core/net_namespace.c:172 [inline]
cleanup_net+0x703/0xba0 net/core/net_namespace.c:640
process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
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+0xb2/0xc0 mm/kasan/generic.c:486
call_rcu+0x14f/0x950 kernel/rcu/tree.c:2849
nf_hook_entries_free net/netfilter/core.c:88 [inline]
__nf_register_net_hook+0x787/0x910 net/netfilter/core.c:445
nf_register_net_hook+0xae/0x190 net/netfilter/core.c:566
nf_register_net_hooks+0x40/0x1a0 net/netfilter/core.c:582
nf_ct_netns_do_get+0x3bc/0x5b0 net/netfilter/nf_conntrack_proto.c:482
nf_ct_netns_inet_get+0x1f/0x150 net/netfilter/nf_conntrack_proto.c:591
nf_conncount_init+0x123/0x380 net/netfilter/nf_conncount.c:640
ovs_ct_limit_init net/openvswitch/conntrack.c:1902 [inline]
ovs_ct_init+0x312/0x480 net/openvswitch/conntrack.c:2311
ovs_init_net+0x1e2/0x240 net/openvswitch/datapath.c:2645
ops_init+0x360/0x5e0 net/core/net_namespace.c:138
setup_net+0x4f2/0xbd0 net/core/net_namespace.c:336
copy_net_ns+0x33e/0x5b0 net/core/net_namespace.c:508
create_new_namespaces+0x3ce/0x700 kernel/nsproxy.c:110
copy_namespaces+0x3ae/0x410 kernel/nsproxy.c:178
copy_process+0x19ef/0x40c0 kernel/fork.c:2360
kernel_clone+0x24b/0x900 kernel/fork.c:2764
__do_sys_clone kernel/fork.c:2905 [inline]
__se_sys_clone kernel/fork.c:2889 [inline]
__x64_sys_clone+0x1a7/0x220 kernel/fork.c:2889
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 ffff88801bfcff00
which belongs to the cache kmalloc-cg-64 of size 64
The buggy address is located 16 bytes inside of
64-byte region [ffff88801bfcff00, ffff88801bfcff40)
The buggy address belongs to the physical page:
page:ffffea00006ff3c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1bfcf
memcg:ffff88807c81be01
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 0000000000000000 dead000000000001 ffff888017442780
raw: 0000000000000000 0000000080200020 00000001ffffffff ffff88807c81be01
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 1, tgid 1 (swapper/0), ts 6168201614, free_ts 0
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2560
prep_new_page mm/page_alloc.c:2567 [inline]
get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358
__alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658
alloc_page_interleave+0x24/0x1e0 mm/mempolicy.c:2115
alloc_slab_page+0x5d/0x180 mm/slub.c:1799
allocate_slab mm/slub.c:1944 [inline]
new_slab+0x87/0x2d0 mm/slub.c:1997
___slab_alloc+0xbc5/0x1240 mm/slub.c:3154
__slab_alloc mm/slub.c:3240 [inline]
slab_alloc_node mm/slub.c:3325 [inline]
__kmem_cache_alloc_node+0x126/0x270 mm/slub.c:3398
__do_kmalloc_node mm/slab_common.c:935 [inline]
__kmalloc_node+0xa2/0x240 mm/slab_common.c:943
kmalloc_node include/linux/slab.h:589 [inline]
kvmalloc_node+0x6c/0x180 mm/util.c:581
kvmalloc include/linux/slab.h:716 [inline]
kvzalloc include/linux/slab.h:724 [inline]
allocate_hook_entries_size net/netfilter/core.c:61 [inline]
nf_hook_entries_grow+0x31a/0x760 net/netfilter/core.c:128
__nf_register_net_hook+0x2c9/0x910 net/netfilter/core.c:423
nf_register_net_hook+0xae/0x190 net/netfilter/core.c:566
nf_register_net_hooks+0x40/0x1a0 net/netfilter/core.c:582
ops_init+0x360/0x5e0 net/core/net_namespace.c:138
__register_pernet_operations net/core/net_namespace.c:1209 [inline]
register_pernet_operations+0x2a3/0x610 net/core/net_namespace.c:1282
page_owner free stack trace missing
Memory state around the buggy address:
ffff88801bfcfe00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
ffff88801bfcfe80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff88801bfcff00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
^
ffff88801bfcff80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff88801bfd0000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 41 56 push %r14
2: 53 push %rbx
3: 48 89 f3 mov %rsi,%rbx
6: 49 89 fe mov %rdi,%r14
9: 48 8b 7c 24 10 mov 0x10(%rsp),%rdi
e: e8 ed fa ff ff call 0xfffffb00
13: 66 90 xchg %ax,%ax
15: 66 90 xchg %ax,%ax
17: e8 a4 a8 5d f7 call 0xf75da8c0
1c: e8 1f a7 5d f7 call 0xf75da740
21: fb sti
22: 65 48 8b 05 86 8e d7 mov %gs:0x75d78e86(%rip),%rax # 0x75d78eb0
29: 75
* 2a: 48 8b 70 08 mov 0x8(%rax),%rsi <-- trapping instruction
2e: 40 f6 c6 3f test $0x3f,%sil
32: 74 0b je 0x3f
34: 4c 89 f7 mov %r14,%rdi
37: 5b pop %rbx
38: 41 5e pop %r14
3a: e9 a1 08 44 f7 jmp 0xf74408e0
3f: 48 rex.W