==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 32 at addr ffff88810e87b210 by task syz.1.131/757
CPU: 1 PID: 757 Comm: syz.1.131 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
__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_52ee0099233a1ca4+0x21/0x31
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
asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:futex_wake_mark+0x99/0x160 kernel/futex/waitwake.c:-1
Code: 0b e9 a2 00 00 00 4d 8d 66 58 4c 89 e0 48 c1 e8 03 80 3c 18 00 74 08 4c 89 e7 e8 52 5e 4f 00 49 83 3c 24 00 0f 85 8d 00 00 00 <4d> 89 ec 49 8d 7f 28 48 89 7d d0 be 04 00 00 00 e8 d2 60 4f 00 41
RSP: 0018:ffffc9000f3b7b20 EFLAGS: 00000246
RAX: 1ffff92001e2ef89 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc90002a9f000 RSI: 0000000000000041 RDI: ffffc9000f177c18
RBP: ffffc9000f3b7b50 R08: ffffc9000f3b7bbf R09: 1ffff92001e76f77
R10: dffffc0000000000 R11: fffff52001e76f78 R12: ffffc9000f177c48
R13: ffffc9000f3b7c30 R14: ffffc9000f177bf0 R15: ffff88811ed73cc0
futex_wake+0x3e5/0x8e0 kernel/futex/waitwake.c:181
do_futex+0x2bf/0x430 kernel/futex/syscalls.c:141
__do_sys_futex kernel/futex/syscalls.c:213 [inline]
__se_sys_futex+0x136/0x310 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: 0033:0x7fb5c8b9cdd9
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:00007fb5c99740e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fb5c8e16098 RCX: 00007fb5c8b9cdd9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fb5c8e1609c
RBP: 00007fb5c8e16090 R08: 001ba0dbce647af3 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb5c8e16128 R14: 00007fff48a31660 R15: 00007fff48a31748
Allocated by task 754:
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
tnode_free net/ipv4/fib_trie.c:496 [inline]
replace+0x1b7/0x4c0 net/ipv4/fib_trie.c:522
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+0x937/0xf10 net/ipv4/fib_frontend.c:1155
fib_netdev_event+0x231/0x5b0 net/ipv4/fib_frontend.c:1500
notifier_call_chain kernel/notifier.c:87 [inline]
raw_notifier_call_chain+0xa1/0x110 kernel/notifier.c:455
call_netdevice_notifiers_info net/core/dev.c:2022 [inline]
call_netdevice_notifiers_extack net/core/dev.c:2060 [inline]
call_netdevice_notifiers net/core/dev.c:2074 [inline]
__dev_notify_flags+0x2c1/0x560 net/core/dev.c:8718
dev_change_flags+0xe8/0x1a0 net/core/dev.c:8756
do_setlink+0xbad/0x3f70 net/core/rtnetlink.c:2833
__rtnl_newlink net/core/rtnetlink.c:3608 [inline]
rtnl_newlink+0x177f/0x20b0 net/core/rtnetlink.c:3655
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: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 ffff88810e87b200
which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
64-byte region [ffff88810e87b200, ffff88810e87b240)
The buggy address belongs to the physical page:
page:ffffea00043a1ec0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10e87b
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004382300 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 1, tgid 1 (swapper/0), ts 2508840223, free_ts 0
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:5926
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_array include/linux/slab.h:615 [inline]
kobj_map+0x6b/0x670 drivers/base/map.c:44
cdev_add fs/char_dev.c:489 [inline]
cdev_device_add+0x15b/0x390 fs/char_dev.c:544
posix_clock_register+0x5a/0x170 kernel/time/posix-clock.c:169
ptp_clock_register+0xbec/0xe90 drivers/ptp/ptp_clock.c:330
ptp_kvm_init+0x5f/0x90 drivers/ptp/ptp_kvm_common.c:149
do_one_initcall+0x1d6/0x580 init/main.c:1433
page_owner free stack trace missing
Memory state around the buggy address:
ffff88810e87b100: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
ffff88810e87b180: 00 00 00 00 00 00 00 02 fc fc fc fc fc fc fc fc
>ffff88810e87b200: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
^
ffff88810e87b280: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
ffff88810e87b300: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: 0b e9 or %ecx,%ebp
2: a2 00 00 00 4d 8d 66 movabs %al,0x4c58668d4d000000
9: 58 4c
b: 89 e0 mov %esp,%eax
d: 48 c1 e8 03 shr $0x3,%rax
11: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1)
15: 74 08 je 0x1f
17: 4c 89 e7 mov %r12,%rdi
1a: e8 52 5e 4f 00 call 0x4f5e71
1f: 49 83 3c 24 00 cmpq $0x0,(%r12)
24: 0f 85 8d 00 00 00 jne 0xb7
* 2a: 4d 89 ec mov %r13,%r12 <-- trapping instruction
2d: 49 8d 7f 28 lea 0x28(%r15),%rdi
31: 48 89 7d d0 mov %rdi,-0x30(%rbp)
35: be 04 00 00 00 mov $0x4,%esi
3a: e8 d2 60 4f 00 call 0x4f6111
3f: 41 rex.B