==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6bf/0x900 kernel/bpf/stackmap.c:271
Write of size 64 at addr ffff888031bd7d90 by task syz.1.4208/20531
CPU: 0 PID: 20531 Comm: syz.1.4208 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
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_7018bb76bd3f7f7a+0x30/0x45
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:10584
__perf_event_overflow+0x447/0x630 kernel/events/core.c:9720
perf_event_overflow kernel/events/core.c:9741 [inline]
perf_swevent_hrtimer+0x439/0x610 kernel/events/core.c:11230
__run_hrtimer kernel/time/hrtimer.c:1754 [inline]
__hrtimer_run_queues+0x4e1/0xc40 kernel/time/hrtimer.c:1818
hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1880
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
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:84 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:127 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:178 [inline]
RIP: 0010:kasan_check_range+0x97/0x290 mm/kasan/generic.c:187
Code: 49 83 fc 10 7f 29 4d 85 e4 0f 84 3d 01 00 00 4c 89 cb 48 f7 d3 4c 01 fb 41 80 3b 00 0f 85 8d 01 00 00 49 ff c3 48 ff c3 75 ee 1d 01 00 00 44 89 dd 83 e5 07 0f 84 b5 00 00 00 41 80 3b 00 4d
RSP: 0018:ffffc900035b7bc8 EFLAGS: 00000256
RAX: ffffffff817bcd01 RBX: 0000000000000000 RCX: ffffffff817bcdad
RDX: 0000000000000001 RSI: 0000000000000018 RDI: ffffc900035b7c80
RBP: 0000000000000000 R08: ffffc900035b7c97 R09: 1ffff920006b6f92
R10: dffffc0000000000 R11: fffff520006b6f93 R12: 0000000000000003
R13: 00007f5e9b815fac R14: fffff520006b6f93 R15: 1ffff920006b6f90
__asan_memset+0x22/0x40 mm/kasan/shadow.c:84
futex_wake+0xad/0x4f0 kernel/futex/waitwake.c:147
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+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f5e9b59ce59
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:00007f5e9c37c0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f5e9b815fa8 RCX: 00007f5e9b59ce59
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f5e9b815fac
RBP: 00007f5e9b815fa0 R08: 0000000000745d1e R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5e9b816038 R14: 00007ffda06a1ab0 R15: 00007ffda06a1b98
Allocated by task 20531:
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:5459
__do_sys_bpf kernel/bpf/syscall.c:5581 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5579 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5579
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 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
ipvlan_register_nf_hook drivers/net/ipvlan/ipvlan_l3s.c:138 [inline]
ipvlan_l3s_register+0x134/0x1d0 drivers/net/ipvlan/ipvlan_l3s.c:210
ipvlan_set_port_mode+0x195/0x3f0 drivers/net/ipvlan/ipvlan_main.c:34
ipvlan_link_new+0x710/0xa90 drivers/net/ipvlan/ipvlan_main.c:633
rtnl_newlink_create net/core/rtnetlink.c:3521 [inline]
__rtnl_newlink net/core/rtnetlink.c:3741 [inline]
rtnl_newlink+0x1542/0x20a0 net/core/rtnetlink.c:3754
rtnetlink_rcv_msg+0x869/0xfa0 net/core/rtnetlink.c:6476
netlink_rcv_skb+0x241/0x4d0 net/netlink/af_netlink.c:2545
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8d0/0xbf0 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
__sys_sendto+0x4a9/0x6b0 net/socket.c:2200
__do_sys_sendto net/socket.c:2212 [inline]
__se_sys_sendto net/socket.c:2208 [inline]
__x64_sys_sendto+0xde/0xf0 net/socket.c:2208
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
The buggy address belongs to the object at ffff888031bd7d80
which belongs to the cache kmalloc-cg-64 of size 64
The buggy address is located 16 bytes inside of
allocated 40-byte region [ffff888031bd7d80, ffff888031bd7da8)
The buggy address belongs to the physical page:
page:ffffea0000c6f5c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888031bd7a80 pfn:0x31bd7
memcg:ffff888024f4a201
ksm flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff888017c4da00 ffffea00017fa100 0000000000000003
raw: ffff888031bd7a80 000000008020001d 00000001ffffffff ffff888024f4a201
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 26814184720, free_ts 26813884041
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:4500
__alloc_pages_node include/linux/gfp.h:237 [inline]
alloc_slab_page+0x4f/0x160 mm/slub.c:1883
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
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc_node+0xa4/0x230 mm/slab_common.c:1014
kmalloc_node include/linux/slab.h:620 [inline]
__alloc kernel/bpf/memalloc.c:151 [inline]
alloc_bulk+0x454/0x6d0 kernel/bpf/memalloc.c:245
prefill_mem_cache kernel/bpf/memalloc.c:486 [inline]
bpf_mem_alloc_init+0x6c6/0x880 kernel/bpf/memalloc.c:554
bpf_global_ma_init+0x1a/0x40 kernel/bpf/core.c:2994
do_one_initcall+0x242/0x790 init/main.c:1249
do_initcall_level+0x137/0x1f0 init/main.c:1311
do_initcalls+0x69/0xd0 init/main.c:1327
kernel_init_freeable+0x3ed/0x580 init/main.c:1564
kernel_init+0x1d/0x1c0 init/main.c:1454
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
delayed_vfree_work+0x55/0x80 mm/vmalloc.c:2788
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Memory state around the buggy address:
ffff888031bd7c80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff888031bd7d00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888031bd7d80: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
^
ffff888031bd7e00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff888031bd7e80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: 49 83 fc 10 cmp $0x10,%r12
4: 7f 29 jg 0x2f
6: 4d 85 e4 test %r12,%r12
9: 0f 84 3d 01 00 00 je 0x14c
f: 4c 89 cb mov %r9,%rbx
12: 48 f7 d3 not %rbx
15: 4c 01 fb add %r15,%rbx
18: 41 80 3b 00 cmpb $0x0,(%r11)
1c: 0f 85 8d 01 00 00 jne 0x1af
22: 49 ff c3 inc %r11
25: 48 ff c3 inc %rbx
28: 75 ee jne 0x18
* 2a: e9 1d 01 00 00 jmp 0x14c <-- trapping instruction
2f: 44 89 dd mov %r11d,%ebp
32: 83 e5 07 and $0x7,%ebp
35: 0f 84 b5 00 00 00 je 0xf0
3b: 41 80 3b 00 cmpb $0x0,(%r11)
3f: 4d rex.WRB